Allow the replicated map to be listened on the add/remove/update of entries

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@788201 13f79535-47bb-0310-9956-ffa450edef68

4 files changed, 1849 insertions, 13 deletions

diff --git a/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/AbstractReplicatedMap.java b/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/AbstractReplicatedMap.java
new file mode 100644
index 0000000000..91aee4d585
--- /dev/null
+++ b/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/AbstractReplicatedMap.java
@@ -0,0 +1,1561 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.tuscany.sca.endpoint.tribes;
+
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.io.Serializable;
+import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.catalina.tribes.Channel;
+import org.apache.catalina.tribes.ChannelException;
+import org.apache.catalina.tribes.ChannelListener;
+import org.apache.catalina.tribes.Heartbeat;
+import org.apache.catalina.tribes.Member;
+import org.apache.catalina.tribes.MembershipListener;
+import org.apache.catalina.tribes.group.Response;
+import org.apache.catalina.tribes.group.RpcCallback;
+import org.apache.catalina.tribes.group.RpcChannel;
+import org.apache.catalina.tribes.io.XByteBuffer;
+import org.apache.catalina.tribes.membership.MemberImpl;
+import org.apache.catalina.tribes.tipis.ReplicatedMapEntry;
+import org.apache.catalina.tribes.util.Arrays;
+import org.apache.juli.logging.Log;
+import org.apache.juli.logging.LogFactory;
+
+/**
+ * This file is copied from:
+ * https://svn.apache.org/repos/asf/tomcat/tc6.0.x/tags/TOMCAT_6_0_20/java/org/apache/catalina/tribes/tipis/AbstractReplicatedMap.java
+ *
+ * We need to intercept the put/remove calls on the base Map to fire events
+ */
+public abstract class AbstractReplicatedMap extends MapStore implements RpcCallback, ChannelListener,
+    MembershipListener, Heartbeat {
+    private static final long serialVersionUID = -2703358020113899074L;
+
+    protected static Log log = LogFactory.getLog(AbstractReplicatedMap.class);
+
+    /**
+     * The default initial capacity - MUST be a power of two.
+     */
+    public static final int DEFAULT_INITIAL_CAPACITY = 16;
+
+    /**
+     * The load factor used when none specified in constructor.
+     **/
+    public static final float DEFAULT_LOAD_FACTOR = 0.75f;
+
+    /**
+     * Used to identify the map
+     */
+    final String chset = "ISO-8859-1";
+
+    //------------------------------------------------------------------------------
+    //              INSTANCE VARIABLES
+    //------------------------------------------------------------------------------
+    protected abstract int getStateMessageType();
+
+    /**
+     * Timeout for RPC messages, how long we will wait for a reply
+     */
+    protected transient long rpcTimeout = 5000;
+    /**
+     * Reference to the channel for sending messages
+     */
+    protected transient Channel channel;
+    /**
+     * The RpcChannel to send RPC messages through
+     */
+    protected transient RpcChannel rpcChannel;
+    /**
+     * The Map context name makes this map unique, this
+     * allows us to have more than one map shared
+     * through one channel
+     */
+    protected transient byte[] mapContextName;
+    /**
+     * Has the state been transferred
+     */
+    protected transient boolean stateTransferred = false;
+    /**
+     * Simple lock object for transfers
+     */
+    protected transient Object stateMutex = new Object();
+    /**
+     * A list of members in our map
+     */
+    protected transient Map<Member, Long> mapMembers = new HashMap<Member, Long>();
+    /**
+     * Our default send options
+     */
+    protected transient int channelSendOptions = Channel.SEND_OPTIONS_DEFAULT;
+    /**
+     * The owner of this map, ala a SessionManager for example
+     */
+    protected transient MapOwner mapOwner;
+    /**
+     * External class loaders if serialization and deserialization is to be performed successfully.
+     */
+    protected transient ClassLoader[] externalLoaders;
+
+    /**
+     * The node we are currently backing up data to, this index will rotate
+     * on a round robin basis
+     */
+    protected transient int currentNode = 0;
+
+    /**
+     * Since the map keeps internal membership
+     * this is the timeout for a ping message to be responded to
+     * If a remote map doesn't respond within this timeframe,
+     * its considered dead.
+     */
+    protected transient long accessTimeout = 5000;
+
+    /**
+     * Readable string of the mapContextName value
+     */
+    protected transient String mapname = "";
+
+    //------------------------------------------------------------------------------
+    //              map owner interface
+    //------------------------------------------------------------------------------
+
+    public static interface MapOwner {
+        public void objectMadePrimay(Object key, Object value);
+    }
+
+    //------------------------------------------------------------------------------
+    //              CONSTRUCTORS
+    //------------------------------------------------------------------------------
+
+    /**
+     * Creates a new map
+     * @param channel The channel to use for communication
+     * @param timeout long - timeout for RPC messags
+     * @param mapContextName String - unique name for this map, to allow multiple maps per channel
+     * @param initialCapacity int - the size of this map, see HashMap
+     * @param loadFactor float - load factor, see HashMap
+     * @param cls - a list of classloaders to be used for deserialization of objects.
+     */
+    public AbstractReplicatedMap(MapOwner owner,
+                                 Channel channel,
+                                 long timeout,
+                                 String mapContextName,
+                                 int initialCapacity,
+                                 float loadFactor,
+                                 int channelSendOptions,
+                                 ClassLoader[] cls) {
+        super(initialCapacity, loadFactor, 15);
+        init(owner, channel, mapContextName, timeout, channelSendOptions, cls);
+
+    }
+
+    /**
+     * Helper methods, wraps a single member in an array
+     * @param m Member
+     * @return Member[]
+     */
+    protected Member[] wrap(Member m) {
+        if (m == null)
+            return new Member[0];
+        else
+            return new Member[] {m};
+    }
+
+    /**
+     * Initializes the map by creating the RPC channel, registering itself as a channel listener
+     * This method is also responsible for initiating the state transfer
+     * @param owner Object
+     * @param channel Channel
+     * @param mapContextName String
+     * @param timeout long
+     * @param channelSendOptions int
+     * @param cls ClassLoader[]
+     */
+    protected void init(MapOwner owner,
+                        Channel channel,
+                        String mapContextName,
+                        long timeout,
+                        int channelSendOptions,
+                        ClassLoader[] cls) {
+        log.info("Initializing AbstractReplicatedMap with context name:" + mapContextName);
+        this.mapOwner = owner;
+        this.externalLoaders = cls;
+        this.channelSendOptions = channelSendOptions;
+        this.channel = channel;
+        this.rpcTimeout = timeout;
+
+        try {
+            this.mapname = mapContextName;
+            //unique context is more efficient if it is stored as bytes
+            this.mapContextName = mapContextName.getBytes(chset);
+        } catch (UnsupportedEncodingException x) {
+            log.warn("Unable to encode mapContextName[" + mapContextName
+                + "] using getBytes("
+                + chset
+                + ") using default getBytes()", x);
+            this.mapContextName = mapContextName.getBytes();
+        }
+        if (log.isTraceEnabled())
+            log.trace("Created Lazy Map with name:" + mapContextName
+                + ", bytes:"
+                + Arrays.toString(this.mapContextName));
+
+        //create an rpc channel and add the map as a listener
+        this.rpcChannel = new RpcChannel(this.mapContextName, channel, this);
+        //add this map as a message listener
+        this.channel.addChannelListener(this);
+        //listen for membership notifications
+        this.channel.addMembershipListener(this);
+
+        try {
+            //broadcast our map, this just notifies other members of our existence
+            broadcast(MapMessage.MSG_INIT, true);
+            //transfer state from another map
+            transferState();
+            //state is transferred, we are ready for messaging
+            broadcast(MapMessage.MSG_START, true);
+        } catch (ChannelException x) {
+            log.warn("Unable to send map start message.");
+            throw new RuntimeException("Unable to start replicated map.", x);
+        }
+    }
+
+    /**
+     * Sends a ping out to all the members in the cluster, not just map members
+     * that this map is alive.
+     * @param timeout long
+     * @throws ChannelException
+     */
+    protected void ping(long timeout) throws ChannelException {
+        //send out a map membership message, only wait for the first reply
+        MapMessage msg =
+            new MapMessage(this.mapContextName, MapMessage.MSG_INIT, false, null, null, null, channel
+                .getLocalMember(false), null);
+        if (channel.getMembers().length > 0) {
+            //send a ping, wait for all nodes to reply
+            Response[] resp =
+                rpcChannel.send(channel.getMembers(),
+                                msg,
+                                rpcChannel.ALL_REPLY,
+                                (channelSendOptions),
+                                (int)accessTimeout);
+            for (int i = 0; i < resp.length; i++) {
+                memberAlive(resp[i].getSource());
+            } //for
+        }
+        //update our map of members, expire some if we didn't receive a ping back
+        synchronized (mapMembers) {
+            Iterator it = mapMembers.entrySet().iterator();
+            long now = System.currentTimeMillis();
+            while (it.hasNext()) {
+                Map.Entry entry = (Map.Entry)it.next();
+                long access = ((Long)entry.getValue()).longValue();
+                if ((now - access) > timeout) {
+                    it.remove();
+                    memberDisappeared((Member)entry.getKey());
+                }
+            }
+        }//synch
+    }
+
+    /**
+     * We have received a member alive notification
+     * @param member Member
+     */
+    protected void memberAlive(Member member) {
+        synchronized (mapMembers) {
+            if (!mapMembers.containsKey(member)) {
+                mapMemberAdded(member);
+            } //end if
+            mapMembers.put(member, new Long(System.currentTimeMillis()));
+        }
+    }
+
+    /**
+     * Helper method to broadcast a message to all members in a channel
+     * @param msgtype int
+     * @param rpc boolean
+     * @throws ChannelException
+     */
+    protected void broadcast(int msgtype, boolean rpc) throws ChannelException {
+        //send out a map membership message, only wait for the first reply
+        MapMessage msg =
+            new MapMessage(this.mapContextName, msgtype, false, null, null, null, channel.getLocalMember(false), null);
+        if (rpc) {
+            Response[] resp =
+                rpcChannel.send(channel.getMembers(), msg, rpcChannel.FIRST_REPLY, (channelSendOptions), rpcTimeout);
+            for (int i = 0; i < resp.length; i++) {
+                mapMemberAdded(resp[i].getSource());
+                messageReceived(resp[i].getMessage(), resp[i].getSource());
+            }
+        } else {
+            channel.send(channel.getMembers(), msg, channelSendOptions);
+        }
+    }
+
+    public void breakdown() {
+        finalize();
+    }
+
+    public void finalize() {
+        try {
+            broadcast(MapMessage.MSG_STOP, false);
+        } catch (Exception ignore) {
+        }
+        //cleanup
+        if (this.rpcChannel != null) {
+            this.rpcChannel.breakdown();
+        }
+        if (this.channel != null) {
+            this.channel.removeChannelListener(this);
+            this.channel.removeMembershipListener(this);
+        }
+        this.rpcChannel = null;
+        this.channel = null;
+        this.mapMembers.clear();
+        super.clear();
+        this.stateTransferred = false;
+        this.externalLoaders = null;
+    }
+
+    public int hashCode() {
+        return Arrays.hashCode(this.mapContextName);
+    }
+
+    public boolean equals(Object o) {
+        if (o == null)
+            return false;
+        if (!(o instanceof AbstractReplicatedMap))
+            return false;
+        if (!(o.getClass().equals(this.getClass())))
+            return false;
+        AbstractReplicatedMap other = (AbstractReplicatedMap)o;
+        return Arrays.equals(mapContextName, other.mapContextName);
+    }
+
+    //------------------------------------------------------------------------------
+    //              GROUP COM INTERFACES
+    //------------------------------------------------------------------------------
+    public Member[] getMapMembers(Map<Member, Long> members) {
+        synchronized (members) {
+            Member[] result = new Member[members.size()];
+            members.keySet().toArray(result);
+            return result;
+        }
+    }
+
+    public Member[] getMapMembers() {
+        return getMapMembers(this.mapMembers);
+    }
+
+    public Member[] getMapMembersExcl(Member[] exclude) {
+        synchronized (mapMembers) {
+            Map<Member, Long> list = (Map<Member, Long>)((HashMap<Member, Long>)mapMembers).clone();
+            for (int i = 0; i < exclude.length; i++)
+                list.remove(exclude[i]);
+            return getMapMembers(list);
+        }
+    }
+
+    /**
+     * Replicates any changes to the object since the last time
+     * The object has to be primary, ie, if the object is a proxy or a backup, it will not be replicated<br>
+     * @param complete - if set to true, the object is replicated to its backup
+     * if set to false, only objects that implement ReplicatedMapEntry and the isDirty() returns true will
+     * be replicated
+     */
+    public void replicate(Object key, boolean complete) {
+        if (log.isTraceEnabled())
+            log.trace("Replicate invoked on key:" + key);
+        MapEntry entry = (MapEntry)super.get(key);
+        if (entry == null)
+            return;
+        if (!entry.isSerializable())
+            return;
+        if (entry != null && entry.isPrimary() && entry.getBackupNodes() != null && entry.getBackupNodes().length > 0) {
+            Object value = entry.getValue();
+            //check to see if we need to replicate this object isDirty()||complete
+            boolean repl = complete || ((value instanceof ReplicatedMapEntry) && ((ReplicatedMapEntry)value).isDirty());
+
+            if (!repl) {
+                if (log.isTraceEnabled())
+                    log.trace("Not replicating:" + key + ", no change made");
+
+                return;
+            }
+            //check to see if the message is diffable
+            boolean diff = ((value instanceof ReplicatedMapEntry) && ((ReplicatedMapEntry)value).isDiffable());
+            MapMessage msg = null;
+            if (diff) {
+                ReplicatedMapEntry rentry = (ReplicatedMapEntry)entry.getValue();
+                try {
+                    rentry.lock();
+                    //construct a diff message
+                    msg =
+                        new MapMessage(mapContextName, MapMessage.MSG_BACKUP, true, (Serializable)entry.getKey(), null,
+                                       rentry.getDiff(), entry.getPrimary(), entry.getBackupNodes());
+                } catch (IOException x) {
+                    log.error("Unable to diff object. Will replicate the entire object instead.", x);
+                } finally {
+                    rentry.unlock();
+                }
+
+            }
+            if (msg == null) {
+                //construct a complete
+                msg =
+                    new MapMessage(mapContextName, MapMessage.MSG_BACKUP, false, (Serializable)entry.getKey(),
+                                   (Serializable)entry.getValue(), null, entry.getPrimary(), entry.getBackupNodes());
+
+            }
+            try {
+                if (channel != null && entry.getBackupNodes() != null && entry.getBackupNodes().length > 0) {
+                    channel.send(entry.getBackupNodes(), msg, channelSendOptions);
+                }
+            } catch (ChannelException x) {
+                log.error("Unable to replicate data.", x);
+            }
+        } //end if
+
+    }
+
+    /**
+     * This can be invoked by a periodic thread to replicate out any changes.
+     * For maps that don't store objects that implement ReplicatedMapEntry, this
+     * method should be used infrequently to avoid large amounts of data transfer
+     * @param complete boolean
+     */
+    public void replicate(boolean complete) {
+        Iterator<Map.Entry<Object, Object>> i = super.entrySet().iterator();
+        while (i.hasNext()) {
+            Map.Entry<Object, Object> e = i.next();
+            replicate(e.getKey(), complete);
+        } //while
+
+    }
+
+    public void transferState() {
+        try {
+            Member[] members = getMapMembers();
+            Member backup = members.length > 0 ? (Member)members[0] : null;
+            if (backup != null) {
+                MapMessage msg =
+                    new MapMessage(mapContextName, getStateMessageType(), false, null, null, null, null, null);
+                Response[] resp =
+                    rpcChannel.send(new Member[] {backup}, msg, RpcChannel.FIRST_REPLY, channelSendOptions, rpcTimeout);
+                if (resp.length > 0) {
+                    synchronized (stateMutex) {
+                        msg = (MapMessage)resp[0].getMessage();
+                        msg.deserialize(getExternalLoaders());
+                        List list = (List)msg.getValue();
+                        for (int i = 0; i < list.size(); i++) {
+                            messageReceived((Serializable)list.get(i), resp[0].getSource());
+                        } //for
+                    }
+                } else {
+                    log.warn("Transfer state, 0 replies, probably a timeout.");
+                }
+            }
+        } catch (ChannelException x) {
+            log.error("Unable to transfer LazyReplicatedMap state.", x);
+        } catch (IOException x) {
+            log.error("Unable to transfer LazyReplicatedMap state.", x);
+        } catch (ClassNotFoundException x) {
+            log.error("Unable to transfer LazyReplicatedMap state.", x);
+        }
+        stateTransferred = true;
+    }
+
+    /**
+     * @todo implement state transfer
+     * @param msg Serializable
+     * @return Serializable - null if no reply should be sent
+     */
+    public Serializable replyRequest(Serializable msg, final Member sender) {
+        if (!(msg instanceof MapMessage))
+            return null;
+        MapMessage mapmsg = (MapMessage)msg;
+
+        //map init request
+        if (mapmsg.getMsgType() == MapMessage.MSG_INIT) {
+            mapmsg.setPrimary(channel.getLocalMember(false));
+            return mapmsg;
+        }
+
+        //map start request
+        if (mapmsg.getMsgType() == MapMessage.MSG_START) {
+            mapmsg.setPrimary(channel.getLocalMember(false));
+            mapMemberAdded(sender);
+            return mapmsg;
+        }
+
+        //backup request
+        if (mapmsg.getMsgType() == MapMessage.MSG_RETRIEVE_BACKUP) {
+            MapEntry entry = (MapEntry)super.get(mapmsg.getKey());
+            if (entry == null || (!entry.isSerializable()))
+                return null;
+            mapmsg.setValue((Serializable)entry.getValue());
+            return mapmsg;
+        }
+
+        //state transfer request
+        if (mapmsg.getMsgType() == MapMessage.MSG_STATE || mapmsg.getMsgType() == MapMessage.MSG_STATE_COPY) {
+            synchronized (stateMutex) { //make sure we dont do two things at the same time
+                ArrayList<MapMessage> list = new ArrayList<MapMessage>();
+                Iterator<Map.Entry<Object, Object>> i = super.entrySet().iterator();
+                while (i.hasNext()) {
+                    Map.Entry<Object, Object> e = i.next();
+                    MapEntry entry = (MapEntry)super.get(e.getKey());
+                    if (entry != null && entry.isSerializable()) {
+                        boolean copy = (mapmsg.getMsgType() == MapMessage.MSG_STATE_COPY);
+                        MapMessage me =
+                            new MapMessage(mapContextName, copy ? MapMessage.MSG_COPY : MapMessage.MSG_PROXY, false,
+                                           (Serializable)entry.getKey(), copy ? (Serializable)entry.getValue() : null,
+                                           null, entry.getPrimary(), entry.getBackupNodes());
+                        list.add(me);
+                    }
+                }
+                mapmsg.setValue(list);
+                return mapmsg;
+
+            } //synchronized
+        }
+
+        return null;
+
+    }
+
+    /**
+     * If the reply has already been sent to the requesting thread,
+     * the rpc callback can handle any data that comes in after the fact.
+     * @param msg Serializable
+     * @param sender Member
+     */
+    public void leftOver(Serializable msg, Member sender) {
+        //left over membership messages
+        if (!(msg instanceof MapMessage))
+            return;
+
+        MapMessage mapmsg = (MapMessage)msg;
+        try {
+            mapmsg.deserialize(getExternalLoaders());
+            if (mapmsg.getMsgType() == MapMessage.MSG_START) {
+                mapMemberAdded(mapmsg.getPrimary());
+            } else if (mapmsg.getMsgType() == MapMessage.MSG_INIT) {
+                memberAlive(mapmsg.getPrimary());
+            }
+        } catch (IOException x) {
+            log.error("Unable to deserialize MapMessage.", x);
+        } catch (ClassNotFoundException x) {
+            log.error("Unable to deserialize MapMessage.", x);
+        }
+    }
+
+    public void messageReceived(Serializable msg, Member sender) {
+        if (!(msg instanceof MapMessage))
+            return;
+
+        MapMessage mapmsg = (MapMessage)msg;
+        if (log.isTraceEnabled()) {
+            log.trace("Map[" + mapname + "] received message:" + mapmsg);
+        }
+
+        try {
+            mapmsg.deserialize(getExternalLoaders());
+        } catch (IOException x) {
+            log.error("Unable to deserialize MapMessage.", x);
+            return;
+        } catch (ClassNotFoundException x) {
+            log.error("Unable to deserialize MapMessage.", x);
+            return;
+        }
+        if (log.isTraceEnabled())
+            log.trace("Map message received from:" + sender.getName() + " msg:" + mapmsg);
+        if (mapmsg.getMsgType() == MapMessage.MSG_START) {
+            mapMemberAdded(mapmsg.getPrimary());
+        }
+
+        if (mapmsg.getMsgType() == MapMessage.MSG_STOP) {
+            memberDisappeared(mapmsg.getPrimary());
+        }
+
+        if (mapmsg.getMsgType() == MapMessage.MSG_PROXY) {
+            MapEntry entry = (MapEntry)super.get(mapmsg.getKey());
+            if (entry == null) {
+                entry = new MapEntry(mapmsg.getKey(), mapmsg.getValue());
+                entry.setBackup(false);
+                entry.setProxy(true);
+                entry.setBackupNodes(mapmsg.getBackupNodes());
+                entry.setPrimary(mapmsg.getPrimary());
+                super.put(entry.getKey(), entry);
+            } else {
+                entry.setProxy(true);
+                entry.setBackup(false);
+                entry.setBackupNodes(mapmsg.getBackupNodes());
+                entry.setPrimary(mapmsg.getPrimary());
+            }
+        }
+
+        if (mapmsg.getMsgType() == MapMessage.MSG_REMOVE) {
+            super.remove(mapmsg.getKey());
+        }
+
+        if (mapmsg.getMsgType() == MapMessage.MSG_BACKUP || mapmsg.getMsgType() == MapMessage.MSG_COPY) {
+            MapEntry entry = (MapEntry)super.get(mapmsg.getKey());
+            if (entry == null) {
+                entry = new MapEntry(mapmsg.getKey(), mapmsg.getValue());
+                entry.setBackup(mapmsg.getMsgType() == MapMessage.MSG_BACKUP);
+                entry.setProxy(false);
+                entry.setBackupNodes(mapmsg.getBackupNodes());
+                entry.setPrimary(mapmsg.getPrimary());
+                if (mapmsg.getValue() != null && mapmsg.getValue() instanceof ReplicatedMapEntry) {
+                    ((ReplicatedMapEntry)mapmsg.getValue()).setOwner(getMapOwner());
+                }
+            } else {
+                entry.setBackup(mapmsg.getMsgType() == MapMessage.MSG_BACKUP);
+                entry.setProxy(false);
+                entry.setBackupNodes(mapmsg.getBackupNodes());
+                entry.setPrimary(mapmsg.getPrimary());
+                if (entry.getValue() instanceof ReplicatedMapEntry) {
+                    ReplicatedMapEntry diff = (ReplicatedMapEntry)entry.getValue();
+                    if (mapmsg.isDiff()) {
+                        try {
+                            diff.lock();
+                            diff.applyDiff(mapmsg.getDiffValue(), 0, mapmsg.getDiffValue().length);
+                        } catch (Exception x) {
+                            log.error("Unable to apply diff to key:" + entry.getKey(), x);
+                        } finally {
+                            diff.unlock();
+                        }
+                    } else {
+                        if (mapmsg.getValue() != null)
+                            entry.setValue(mapmsg.getValue());
+                        ((ReplicatedMapEntry)entry.getValue()).setOwner(getMapOwner());
+                    } //end if
+                } else if (mapmsg.getValue() instanceof ReplicatedMapEntry) {
+                    ReplicatedMapEntry re = (ReplicatedMapEntry)mapmsg.getValue();
+                    re.setOwner(getMapOwner());
+                    entry.setValue(re);
+                } else {
+                    if (mapmsg.getValue() != null)
+                        entry.setValue(mapmsg.getValue());
+                } //end if
+            } //end if
+            super.put(entry.getKey(), entry);
+        } //end if
+    }
+
+    public boolean accept(Serializable msg, Member sender) {
+        boolean result = false;
+        if (msg instanceof MapMessage) {
+            if (log.isTraceEnabled())
+                log.trace("Map[" + mapname + "] accepting...." + msg);
+            result = Arrays.equals(mapContextName, ((MapMessage)msg).getMapId());
+            if (log.isTraceEnabled())
+                log.trace("Msg[" + mapname + "] accepted[" + result + "]...." + msg);
+        }
+        return result;
+    }
+
+    public void mapMemberAdded(Member member) {
+        if (member.equals(getChannel().getLocalMember(false)))
+            return;
+        boolean memberAdded = false;
+        //select a backup node if we don't have one
+        synchronized (mapMembers) {
+            if (!mapMembers.containsKey(member)) {
+                mapMembers.put(member, new Long(System.currentTimeMillis()));
+                memberAdded = true;
+            }
+        }
+        if (memberAdded) {
+            synchronized (stateMutex) {
+                Iterator<Map.Entry<Object, Object>> i = super.entrySet().iterator();
+                while (i.hasNext()) {
+                    Map.Entry<Object, Object> e = i.next();
+                    MapEntry entry = (MapEntry)super.get(e.getKey());
+                    if (entry == null)
+                        continue;
+                    if (entry.isPrimary() && (entry.getBackupNodes() == null || entry.getBackupNodes().length == 0)) {
+                        try {
+                            Member[] backup = publishEntryInfo(entry.getKey(), entry.getValue());
+                            entry.setBackupNodes(backup);
+                            entry.setPrimary(channel.getLocalMember(false));
+                        } catch (ChannelException x) {
+                            log.error("Unable to select backup node.", x);
+                        } //catch
+                    } //end if
+                } //while
+            } //synchronized
+        }//end if
+    }
+
+    public boolean inSet(Member m, Member[] set) {
+        if (set == null)
+            return false;
+        boolean result = false;
+        for (int i = 0; i < set.length && (!result); i++)
+            if (m.equals(set[i]))
+                result = true;
+        return result;
+    }
+
+    public Member[] excludeFromSet(Member[] mbrs, Member[] set) {
+        List<Member> result = new ArrayList<Member>();
+        for (int i = 0; i < set.length; i++) {
+            boolean include = true;
+            for (int j = 0; j < mbrs.length; j++)
+                if (mbrs[j].equals(set[i]))
+                    include = false;
+            if (include)
+                result.add(set[i]);
+        }
+        return (Member[])result.toArray(new Member[result.size()]);
+    }
+
+    public void memberAdded(Member member) {
+        //do nothing
+    }
+
+    public void memberDisappeared(Member member) {
+        boolean removed = false;
+        synchronized (mapMembers) {
+            removed = (mapMembers.remove(member) != null);
+            if (!removed) {
+                if (log.isDebugEnabled())
+                    log.debug("Member[" + member + "] disappeared, but was not present in the map.");
+                return; //the member was not part of our map.
+            }
+        }
+
+        Iterator<Map.Entry<Object, Object>> i = super.entrySet().iterator();
+        while (i.hasNext()) {
+            Map.Entry<Object, Object> e = i.next();
+            MapEntry entry = (MapEntry)super.get(e.getKey());
+            if (entry == null)
+                continue;
+            if (entry.isPrimary() && inSet(member, entry.getBackupNodes())) {
+                if (log.isDebugEnabled())
+                    log.debug("[1] Primary choosing a new backup");
+                try {
+                    Member[] backup = publishEntryInfo(entry.getKey(), entry.getValue());
+                    entry.setBackupNodes(backup);
+                    entry.setPrimary(channel.getLocalMember(false));
+                } catch (ChannelException x) {
+                    log.error("Unable to relocate[" + entry.getKey() + "] to a new backup node", x);
+                }
+            } else if (member.equals(entry.getPrimary())) {
+                if (log.isDebugEnabled())
+                    log.debug("[2] Primary disappeared");
+                entry.setPrimary(null);
+            } //end if
+
+            if (entry.isProxy() && entry.getPrimary() == null
+                && entry.getBackupNodes() != null
+                && entry.getBackupNodes().length == 1
+                && entry.getBackupNodes()[0].equals(member)) {
+                //remove proxies that have no backup nor primaries
+                if (log.isDebugEnabled())
+                    log.debug("[3] Removing orphaned proxy");
+                i.remove();
+            } else if (entry.getPrimary() == null && entry.isBackup()
+                && entry.getBackupNodes() != null
+                && entry.getBackupNodes().length == 1
+                && entry.getBackupNodes()[0].equals(channel.getLocalMember(false))) {
+                try {
+                    if (log.isDebugEnabled())
+                        log.debug("[4] Backup becoming primary");
+                    entry.setPrimary(channel.getLocalMember(false));
+                    entry.setBackup(false);
+                    entry.setProxy(false);
+                    Member[] backup = publishEntryInfo(entry.getKey(), entry.getValue());
+                    entry.setBackupNodes(backup);
+                    if (mapOwner != null)
+                        mapOwner.objectMadePrimay(entry.getKey(), entry.getValue());
+
+                } catch (ChannelException x) {
+                    log.error("Unable to relocate[" + entry.getKey() + "] to a new backup node", x);
+                }
+            }
+
+        } //while
+    }
+
+    public int getNextBackupIndex() {
+        int size = mapMembers.size();
+        if (mapMembers.size() == 0)
+            return -1;
+        int node = currentNode++;
+        if (node >= size) {
+            node = 0;
+            currentNode = 0;
+        }
+        return node;
+    }
+
+    public Member getNextBackupNode() {
+        Member[] members = getMapMembers();
+        int node = getNextBackupIndex();
+        if (members.length == 0 || node == -1)
+            return null;
+        if (node >= members.length)
+            node = 0;
+        return members[node];
+    }
+
+    protected abstract Member[] publishEntryInfo(Object key, Object value) throws ChannelException;
+
+    public void heartbeat() {
+        try {
+            ping(accessTimeout);
+        } catch (Exception x) {
+            log.error("Unable to send AbstractReplicatedMap.ping message", x);
+        }
+    }
+
+    //------------------------------------------------------------------------------
+    //              METHODS TO OVERRIDE
+    //------------------------------------------------------------------------------
+
+    /**
+     * Removes an object from this map, it will also remove it from
+     *
+     * @param key Object
+     * @return Object
+     */
+    public Object remove(Object key) {
+        return remove(key, true);
+    }
+
+    public Object remove(Object key, boolean notify) {
+        MapEntry entry = (MapEntry)super.remove(key);
+
+        try {
+            if (getMapMembers().length > 0 && notify) {
+                MapMessage msg =
+                    new MapMessage(getMapContextName(), MapMessage.MSG_REMOVE, false, (Serializable)key, null, null,
+                                   null, null);
+                getChannel().send(getMapMembers(), msg, getChannelSendOptions());
+            }
+        } catch (ChannelException x) {
+            log.error("Unable to replicate out data for a LazyReplicatedMap.remove operation", x);
+        }
+        return entry != null ? entry.getValue() : null;
+    }
+
+    public MapEntry getInternal(Object key) {
+        return (MapEntry)super.get(key);
+    }
+
+    public Object get(Object key) {
+        MapEntry entry = (MapEntry)super.get(key);
+        if (log.isTraceEnabled())
+            log.trace("Requesting id:" + key + " entry:" + entry);
+        if (entry == null)
+            return null;
+        if (!entry.isPrimary()) {
+            //if the message is not primary, we need to retrieve the latest value
+            try {
+                Member[] backup = null;
+                MapMessage msg = null;
+                if (!entry.isBackup()) {
+                    //make sure we don't retrieve from ourselves
+                    msg =
+                        new MapMessage(getMapContextName(), MapMessage.MSG_RETRIEVE_BACKUP, false, (Serializable)key,
+                                       null, null, null, null);
+                    Response[] resp =
+                        getRpcChannel().send(entry.getBackupNodes(),
+                                             msg,
+                                             RpcChannel.FIRST_REPLY,
+                                             Channel.SEND_OPTIONS_DEFAULT,
+                                             getRpcTimeout());
+                    if (resp == null || resp.length == 0) {
+                        //no responses
+                        log.warn("Unable to retrieve remote object for key:" + key);
+                        return null;
+                    }
+                    msg = (MapMessage)resp[0].getMessage();
+                    msg.deserialize(getExternalLoaders());
+                    backup = entry.getBackupNodes();
+                    if (entry.getValue() instanceof ReplicatedMapEntry) {
+                        ReplicatedMapEntry val = (ReplicatedMapEntry)entry.getValue();
+                        val.setOwner(getMapOwner());
+                    }
+                    if (msg.getValue() != null)
+                        entry.setValue(msg.getValue());
+                }
+                if (entry.isBackup()) {
+                    //select a new backup node
+                    backup = publishEntryInfo(key, entry.getValue());
+                } else if (entry.isProxy()) {
+                    //invalidate the previous primary
+                    msg =
+                        new MapMessage(getMapContextName(), MapMessage.MSG_PROXY, false, (Serializable)key, null, null,
+                                       channel.getLocalMember(false), backup);
+                    Member[] dest = getMapMembersExcl(backup);
+                    if (dest != null && dest.length > 0) {
+                        getChannel().send(dest, msg, getChannelSendOptions());
+                    }
+                }
+                entry.setPrimary(channel.getLocalMember(false));
+                entry.setBackupNodes(backup);
+                entry.setBackup(false);
+                entry.setProxy(false);
+
+            } catch (Exception x) {
+                log.error("Unable to replicate out data for a LazyReplicatedMap.get operation", x);
+                return null;
+            }
+        }
+        if (log.isTraceEnabled())
+            log.trace("Requesting id:" + key + " result:" + entry.getValue());
+        if (entry.getValue() != null && entry.getValue() instanceof ReplicatedMapEntry) {
+            ReplicatedMapEntry val = (ReplicatedMapEntry)entry.getValue();
+            //hack, somehow this is not being set above
+            val.setOwner(getMapOwner());
+
+        }
+        return entry.getValue();
+    }
+
+    protected void printMap(String header) {
+        try {
+            System.out.println("\nDEBUG MAP:" + header);
+            System.out.println("Map[" + new String(mapContextName, chset) + ", Map Size:" + super.size());
+            Member[] mbrs = getMapMembers();
+            for (int i = 0; i < mbrs.length; i++) {
+                System.out.println("Mbr[" + (i + 1) + "=" + mbrs[i].getName());
+            }
+            Iterator i = super.entrySet().iterator();
+            int cnt = 0;
+
+            while (i.hasNext()) {
+                Map.Entry e = (Map.Entry)i.next();
+                System.out.println((++cnt) + ". " + super.get(e.getKey()));
+            }
+            System.out.println("EndMap]\n\n");
+        } catch (Exception ignore) {
+            ignore.printStackTrace();
+        }
+    }
+
+    /**
+         * Returns true if the key has an entry in the map.
+         * The entry can be a proxy or a backup entry, invoking <code>get(key)</code>
+         * will make this entry primary for the group
+         * @param key Object
+         * @return boolean
+         */
+    public boolean containsKey(Object key) {
+        return super.containsKey(key);
+    }
+
+    public Object put(Object key, Object value) {
+        return put(key, value, true);
+    }
+
+    public Object put(Object key, Object value, boolean notify) {
+        MapEntry entry = new MapEntry(key, value);
+        entry.setBackup(false);
+        entry.setProxy(false);
+        entry.setPrimary(channel.getLocalMember(false));
+
+        Object old = null;
+
+        //make sure that any old values get removed
+        if (containsKey(key))
+            old = remove(key);
+        try {
+            if (notify) {
+                Member[] backup = publishEntryInfo(key, value);
+                entry.setBackupNodes(backup);
+            }
+        } catch (ChannelException x) {
+            log.error("Unable to replicate out data for a LazyReplicatedMap.put operation", x);
+        }
+        super.put(key, entry);
+        return old;
+    }
+
+    /**
+     * Copies all values from one map to this instance
+     * @param m Map
+     */
+    public void putAll(Map m) {
+        Iterator i = m.entrySet().iterator();
+        while (i.hasNext()) {
+            Map.Entry entry = (Map.Entry)i.next();
+            put(entry.getKey(), entry.getValue());
+        }
+    }
+
+    public void clear() {
+        clear(true);
+    }
+
+    public void clear(boolean notify) {
+        if (notify) {
+            //only delete active keys
+            Iterator<Object> keys = keySet().iterator();
+            while (keys.hasNext())
+                remove(keys.next());
+        } else {
+            super.clear();
+        }
+    }
+
+    public boolean containsValue(Object value) {
+        if (value == null) {
+            return super.containsValue(value);
+        } else {
+            Iterator<Map.Entry<Object, Object>> i = super.entrySet().iterator();
+            while (i.hasNext()) {
+                Map.Entry<Object, Object> e = i.next();
+                MapEntry entry = (MapEntry)super.get(e.getKey());
+                if (entry != null && entry.isPrimary() && value.equals(entry.getValue()))
+                    return true;
+            }//while
+            return false;
+        }//end if
+    }
+
+    public Object clone() {
+        throw new UnsupportedOperationException("This operation is not valid on a replicated map");
+    }
+
+    /**
+     * Returns the entire contents of the map
+     * Map.Entry.getValue() will return a LazyReplicatedMap.MapEntry object containing all the information
+     * about the object.
+     * @return Set
+     */
+    public Set<Map.Entry<Object, Object>> entrySetFull() {
+        return super.entrySet();
+    }
+
+    public Set<Object> keySetFull() {
+        return super.keySet();
+    }
+
+    public int sizeFull() {
+        return super.size();
+    }
+
+    public Set<Map.Entry<Object, Object>> entrySet() {
+        Set<Map.Entry<Object, Object>> set = new LinkedHashSet<Map.Entry<Object, Object>>(super.size());
+        Iterator<Map.Entry<Object, Object>> i = super.entrySet().iterator();
+        while (i.hasNext()) {
+            Map.Entry<Object, Object> e = i.next();
+            Object key = e.getKey();
+            MapEntry entry = (MapEntry)super.get(key);
+            if (entry != null && entry.isPrimary()) {
+                set.add(new MapEntry(key, entry.getValue()));
+            }
+        }
+        return Collections.unmodifiableSet(set);
+    }
+
+    public Set<Object> keySet() {
+        //todo implement
+        //should only return keys where this is active.
+        LinkedHashSet<Object> set = new LinkedHashSet<Object>(super.size());
+        Iterator<Map.Entry<Object, Object>> i = super.entrySet().iterator();
+        while (i.hasNext()) {
+            Map.Entry<Object, Object> e = i.next();
+            Object key = e.getKey();
+            MapEntry entry = (MapEntry)super.get(key);
+            if (entry != null && entry.isPrimary())
+                set.add(key);
+        }
+        return Collections.unmodifiableSet(set);
+
+    }
+
+    public int size() {
+        //todo, implement a counter variable instead
+        //only count active members in this node
+        int counter = 0;
+        Iterator<Map.Entry<Object, Object>> it = super.entrySet().iterator();
+        while (it != null && it.hasNext()) {
+            Map.Entry<Object, Object> e = it.next();
+            if (e != null) {
+                MapEntry entry = (MapEntry)super.get(e.getKey());
+                if (entry != null && entry.isPrimary() && entry.getValue() != null)
+                    counter++;
+            }
+        }
+        return counter;
+    }
+
+    protected boolean removeEldestEntry(Map.Entry<Object, Object> eldest) {
+        return false;
+    }
+
+    public boolean isEmpty() {
+        return size() == 0;
+    }
+
+    public Collection<Object> values() {
+        ArrayList<Object> values = new ArrayList<Object>();
+        Iterator<Map.Entry<Object, Object>> i = super.entrySet().iterator();
+        while (i.hasNext()) {
+            Map.Entry<Object, Object> e = i.next();
+            MapEntry entry = (MapEntry)super.get(e.getKey());
+            if (entry != null && entry.isPrimary() && entry.getValue() != null)
+                values.add(entry.getValue());
+        }
+        return Collections.unmodifiableCollection(values);
+    }
+
+    //------------------------------------------------------------------------------
+    //                Map Entry class
+    //------------------------------------------------------------------------------
+    public static class MapEntry implements Map.Entry<Object, Object> {
+        private boolean backup;
+        private boolean proxy;
+        private Member[] backupNodes;
+        private Member primary;
+        private Object key;
+        private Object value;
+
+        public MapEntry(Object key, Object value) {
+            setKey(key);
+            setValue(value);
+
+        }
+
+        public boolean isKeySerializable() {
+            return (key == null) || (key instanceof Serializable);
+        }
+
+        public boolean isValueSerializable() {
+            return (value == null) || (value instanceof Serializable);
+        }
+
+        public boolean isSerializable() {
+            return isKeySerializable() && isValueSerializable();
+        }
+
+        public boolean isBackup() {
+            return backup;
+        }
+
+        public void setBackup(boolean backup) {
+            this.backup = backup;
+        }
+
+        public boolean isProxy() {
+            return proxy;
+        }
+
+        public boolean isPrimary() {
+            return ((!proxy) && (!backup));
+        }
+
+        public void setProxy(boolean proxy) {
+            this.proxy = proxy;
+        }
+
+        public boolean isDiffable() {
+            return (value instanceof ReplicatedMapEntry) && ((ReplicatedMapEntry)value).isDiffable();
+        }
+
+        public void setBackupNodes(Member[] nodes) {
+            this.backupNodes = nodes;
+        }
+
+        public Member[] getBackupNodes() {
+            return backupNodes;
+        }
+
+        public void setPrimary(Member m) {
+            primary = m;
+        }
+
+        public Member getPrimary() {
+            return primary;
+        }
+
+        public Object getValue() {
+            return value;
+        }
+
+        public Object setValue(Object value) {
+            Object old = this.value;
+            this.value = value;
+            return old;
+        }
+
+        public Object getKey() {
+            return key;
+        }
+
+        public Object setKey(Object key) {
+            Object old = this.key;
+            this.key = key;
+            return old;
+        }
+
+        public int hashCode() {
+            return key.hashCode();
+        }
+
+        public boolean equals(Object o) {
+            return key.equals(o);
+        }
+
+        /**
+         * apply a diff, or an entire object
+         * @param data byte[]
+         * @param offset int
+         * @param length int
+         * @param diff boolean
+         * @throws IOException
+         * @throws ClassNotFoundException
+         */
+        public void apply(byte[] data, int offset, int length, boolean diff) throws IOException, ClassNotFoundException {
+            if (isDiffable() && diff) {
+                ReplicatedMapEntry rentry = (ReplicatedMapEntry)value;
+                try {
+                    rentry.lock();
+                    rentry.applyDiff(data, offset, length);
+                } finally {
+                    rentry.unlock();
+                }
+            } else if (length == 0) {
+                value = null;
+                proxy = true;
+            } else {
+                value = XByteBuffer.deserialize(data, offset, length);
+            }
+        }
+
+        public String toString() {
+            StringBuffer buf = new StringBuffer("MapEntry[key:");
+            buf.append(getKey()).append("; ");
+            buf.append("value:").append(getValue()).append("; ");
+            buf.append("primary:").append(isPrimary()).append("; ");
+            buf.append("backup:").append(isBackup()).append("; ");
+            buf.append("proxy:").append(isProxy()).append(";]");
+            return buf.toString();
+        }
+
+    }
+
+    //------------------------------------------------------------------------------
+    //                map message to send to and from other maps
+    //------------------------------------------------------------------------------
+
+    public static class MapMessage implements Serializable {
+        private static final long serialVersionUID = -7847288807489375686L;
+        public static final int MSG_BACKUP = 1;
+        public static final int MSG_RETRIEVE_BACKUP = 2;
+        public static final int MSG_PROXY = 3;
+        public static final int MSG_REMOVE = 4;
+        public static final int MSG_STATE = 5;
+        public static final int MSG_START = 6;
+        public static final int MSG_STOP = 7;
+        public static final int MSG_INIT = 8;
+        public static final int MSG_COPY = 9;
+        public static final int MSG_STATE_COPY = 10;
+
+        private byte[] mapId;
+        private int msgtype;
+        private boolean diff;
+        private transient Serializable key;
+        private transient Serializable value;
+        private byte[] valuedata;
+        private byte[] keydata;
+        private byte[] diffvalue;
+        private Member[] nodes;
+        private Member primary;
+
+        public String toString() {
+            StringBuffer buf = new StringBuffer("MapMessage[context=");
+            buf.append(new String(mapId));
+            buf.append("; type=");
+            buf.append(getTypeDesc());
+            buf.append("; key=");
+            buf.append(key);
+            buf.append("; value=");
+            buf.append(value);
+            return buf.toString();
+        }
+
+        public String getTypeDesc() {
+            switch (msgtype) {
+                case MSG_BACKUP:
+                    return "MSG_BACKUP";
+                case MSG_RETRIEVE_BACKUP:
+                    return "MSG_RETRIEVE_BACKUP";
+                case MSG_PROXY:
+                    return "MSG_PROXY";
+                case MSG_REMOVE:
+                    return "MSG_REMOVE";
+                case MSG_STATE:
+                    return "MSG_STATE";
+                case MSG_START:
+                    return "MSG_START";
+                case MSG_STOP:
+                    return "MSG_STOP";
+                case MSG_INIT:
+                    return "MSG_INIT";
+                case MSG_STATE_COPY:
+                    return "MSG_STATE_COPY";
+                case MSG_COPY:
+                    return "MSG_COPY";
+                default:
+                    return "UNKNOWN";
+            }
+        }
+
+        public MapMessage() {
+        }
+
+        public MapMessage(byte[] mapId,
+                          int msgtype,
+                          boolean diff,
+                          Serializable key,
+                          Serializable value,
+                          byte[] diffvalue,
+                          Member primary,
+                          Member[] nodes) {
+            this.mapId = mapId;
+            this.msgtype = msgtype;
+            this.diff = diff;
+            this.key = key;
+            this.value = value;
+            this.diffvalue = diffvalue;
+            this.nodes = nodes;
+            this.primary = primary;
+            setValue(value);
+            setKey(key);
+        }
+
+        public void deserialize(ClassLoader[] cls) throws IOException, ClassNotFoundException {
+            key(cls);
+            value(cls);
+        }
+
+        public int getMsgType() {
+            return msgtype;
+        }
+
+        public boolean isDiff() {
+            return diff;
+        }
+
+        public Serializable getKey() {
+            try {
+                return key(null);
+            } catch (Exception x) {
+                log.error("Deserialization error of the MapMessage.key", x);
+                return null;
+            }
+        }
+
+        public Serializable key(ClassLoader[] cls) throws IOException, ClassNotFoundException {
+            if (key != null)
+                return key;
+            if (keydata == null || keydata.length == 0)
+                return null;
+            key = XByteBuffer.deserialize(keydata, 0, keydata.length, cls);
+            keydata = null;
+            return key;
+        }
+
+        public byte[] getKeyData() {
+            return keydata;
+        }
+
+        public Serializable getValue() {
+            try {
+                return value(null);
+            } catch (Exception x) {
+                log.error("Deserialization error of the MapMessage.value", x);
+                return null;
+            }
+        }
+
+        public Serializable value(ClassLoader[] cls) throws IOException, ClassNotFoundException {
+            if (value != null)
+                return value;
+            if (valuedata == null || valuedata.length == 0)
+                return null;
+            value = XByteBuffer.deserialize(valuedata, 0, valuedata.length, cls);
+            valuedata = null;
+            ;
+            return value;
+        }
+
+        public byte[] getValueData() {
+            return valuedata;
+        }
+
+        public byte[] getDiffValue() {
+            return diffvalue;
+        }
+
+        public Member[] getBackupNodes() {
+            return nodes;
+        }
+
+        private void setBackUpNodes(Member[] nodes) {
+            this.nodes = nodes;
+        }
+
+        public Member getPrimary() {
+            return primary;
+        }
+
+        private void setPrimary(Member m) {
+            primary = m;
+        }
+
+        public byte[] getMapId() {
+            return mapId;
+        }
+
+        public void setValue(Serializable value) {
+            try {
+                if (value != null)
+                    valuedata = XByteBuffer.serialize(value);
+                this.value = value;
+            } catch (IOException x) {
+                throw new RuntimeException(x);
+            }
+        }
+
+        public void setKey(Serializable key) {
+            try {
+                if (key != null)
+                    keydata = XByteBuffer.serialize(key);
+                this.key = key;
+            } catch (IOException x) {
+                throw new RuntimeException(x);
+            }
+        }
+
+        protected Member[] readMembers(ObjectInput in) throws IOException, ClassNotFoundException {
+            int nodecount = in.readInt();
+            Member[] members = new Member[nodecount];
+            for (int i = 0; i < members.length; i++) {
+                byte[] d = new byte[in.readInt()];
+                in.read(d);
+                if (d.length > 0)
+                    members[i] = MemberImpl.getMember(d);
+            }
+            return members;
+        }
+
+        protected void writeMembers(ObjectOutput out, Member[] members) throws IOException {
+            if (members == null)
+                members = new Member[0];
+            out.writeInt(members.length);
+            for (int i = 0; i < members.length; i++) {
+                if (members[i] != null) {
+                    byte[] d = members[i] != null ? ((MemberImpl)members[i]).getData(false) : new byte[0];
+                    out.writeInt(d.length);
+                    out.write(d);
+                }
+            }
+        }
+
+        /**
+         * shallow clone
+         * @return Object
+         */
+        public Object clone() {
+            MapMessage msg =
+                new MapMessage(this.mapId, this.msgtype, this.diff, this.key, this.value, this.diffvalue, this.primary,
+                               this.nodes);
+            msg.keydata = this.keydata;
+            msg.valuedata = this.valuedata;
+            return msg;
+        }
+    } //MapMessage
+
+    public Channel getChannel() {
+        return channel;
+    }
+
+    public byte[] getMapContextName() {
+        return mapContextName;
+    }
+
+    public RpcChannel getRpcChannel() {
+        return rpcChannel;
+    }
+
+    public long getRpcTimeout() {
+        return rpcTimeout;
+    }
+
+    public Object getStateMutex() {
+        return stateMutex;
+    }
+
+    public boolean isStateTransferred() {
+        return stateTransferred;
+    }
+
+    public MapOwner getMapOwner() {
+        return mapOwner;
+    }
+
+    public ClassLoader[] getExternalLoaders() {
+        return externalLoaders;
+    }
+
+    public int getChannelSendOptions() {
+        return channelSendOptions;
+    }
+
+    public long getAccessTimeout() {
+        return accessTimeout;
+    }
+
+    public void setMapOwner(MapOwner mapOwner) {
+        this.mapOwner = mapOwner;
+    }
+
+    public void setExternalLoaders(ClassLoader[] externalLoaders) {
+        this.externalLoaders = externalLoaders;
+    }
+
+    public void setChannelSendOptions(int channelSendOptions) {
+        this.channelSendOptions = channelSendOptions;
+    }
+
+    public void setAccessTimeout(long accessTimeout) {
+        this.accessTimeout = accessTimeout;
+    }
+
+}
diff --git a/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/MapStore.java b/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/MapStore.java
new file mode 100644
index 0000000000..d667f10c50
--- /dev/null
+++ b/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/MapStore.java
@@ -0,0 +1,83 @@
+/*

+ * Licensed to the Apache Software Foundation (ASF) under one

+ * or more contributor license agreements.  See the NOTICE file

+ * distributed with this work for additional information

+ * regarding copyright ownership.  The ASF licenses this file

+ * to you under the Apache License, Version 2.0 (the

+ * "License"); you may not use this file except in compliance

+ * with the License.  You may obtain a copy of the License at

+ *

+ *   http://www.apache.org/licenses/LICENSE-2.0

+ *

+ * Unless required by applicable law or agreed to in writing,

+ * software distributed under the License is distributed on an

+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

+ * KIND, either express or implied.  See the License for the

+ * specific language governing permissions and limitations

+ * under the License.

+ */

+

+package org.apache.tuscany.sca.endpoint.tribes;

+

+import java.util.List;

+import java.util.concurrent.ConcurrentHashMap;

+import java.util.concurrent.CopyOnWriteArrayList;

+

+/**

+ * The Map that can fire events on put/remove of entries

+ */

+public abstract class MapStore extends ConcurrentHashMap<Object, Object> {

+    private static final long serialVersionUID = -2127235547082144368L;

+    private List<MapListener> listeners = new CopyOnWriteArrayList<MapListener>();

+

+    protected MapStore(int initialCapacity, float loadFactor, int concurrencyLevel) {

+        super(initialCapacity, loadFactor, concurrencyLevel);

+    }

+

+    @Override

+    public Object put(Object key, Object value) {

+        Object old = super.put(key, value);

+        if (old != null) {

+            for (MapListener listener : listeners) {

+                listener.entryUpdated(key, old, value);

+            }

+        } else {

+            for (MapListener listener : listeners) {

+                listener.entryAdded(key, value);

+            }

+

+        }

+        return old;

+    }

+

+    @Override

+    public Object remove(Object key) {

+        Object old = super.remove(key);

+        if (old != null) {

+            for (MapListener listener : listeners) {

+                listener.entryRemoved(key, old);

+            }

+        }

+        return old;

+    }

+

+    public void addListener(MapListener listener) {

+        listeners.add(listener);

+    }

+

+    public List<MapListener> getListeners() {

+        return listeners;

+    }

+

+    public boolean removeListener(MapListener listener) {

+        return listeners.remove(listener);

+    }

+

+    public static interface MapListener {

+        void entryAdded(Object key, Object value);

+

+        void entryUpdated(Object key, Object oldValue, Object newValue);

+

+        void entryRemoved(Object key, Object value);

+    }

+}

diff --git a/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/ReplicatedEndpointRegistry.java b/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/ReplicatedEndpointRegistry.java
index cc16d80b47..4d24c8a35e 100644
--- a/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/ReplicatedEndpointRegistry.java
+++ b/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/ReplicatedEndpointRegistry.java
@@ -19,9 +19,11 @@
 

 package org.apache.tuscany.sca.endpoint.tribes;

 

+import java.net.InetAddress;

 import java.util.ArrayList;

 import java.util.List;

 import java.util.Map;

+import java.util.UUID;

 import java.util.concurrent.CopyOnWriteArrayList;

 import java.util.logging.Logger;

 

@@ -29,19 +31,19 @@ import org.apache.catalina.tribes.Channel;
 import org.apache.catalina.tribes.ChannelException;

 import org.apache.catalina.tribes.group.GroupChannel;

 import org.apache.catalina.tribes.membership.McastService;

-import org.apache.catalina.tribes.tipis.ReplicatedMap;

-import org.apache.catalina.tribes.tipis.AbstractReplicatedMap.MapEntry;

 import org.apache.tuscany.sca.assembly.Endpoint;

 import org.apache.tuscany.sca.assembly.EndpointReference;

 import org.apache.tuscany.sca.core.ExtensionPointRegistry;

 import org.apache.tuscany.sca.core.LifeCycleListener;

+import org.apache.tuscany.sca.endpoint.tribes.AbstractReplicatedMap.MapEntry;

+import org.apache.tuscany.sca.endpoint.tribes.MapStore.MapListener;

 import org.apache.tuscany.sca.runtime.EndpointListener;

 import org.apache.tuscany.sca.runtime.EndpointRegistry;

 

 /**

  * A replicated EndpointRegistry based on Apache Tomcat Tribes

  */

-public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleListener {

+public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleListener, MapListener {

     private final static Logger logger = Logger.getLogger(ReplicatedEndpointRegistry.class.getName());

     private static final String MULTICAST_ADDRESS = "228.0.0.100";

     private static final int MULTICAST_PORT = 50000;

@@ -92,7 +94,6 @@ public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleLi
             mcastService.setBind(bindAddress);

         }

 

-        // mcastService.setBind("192.168.1.100");

         return channel;

     }

 

@@ -126,6 +127,7 @@ public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleLi
         map =

             new ReplicatedMap(null, createChannel(address, port, bind), timeout, this.domainURI,

                               new ClassLoader[] {ReplicatedEndpointRegistry.class.getClassLoader()});

+        map.addListener(this);

         try {

             map.getChannel().start(Channel.DEFAULT);

         } catch (ChannelException e) {

@@ -135,6 +137,7 @@ public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleLi
 

     public void stop() {

         if (map != null) {

+            map.removeListener(this);

             Channel channel = map.getChannel();

             map.breakdown();

             try {

@@ -151,12 +154,12 @@ public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleLi
         for (EndpointListener listener : listeners) {

             listener.endpointAdded(endpoint);

         }

-        logger.info("EndpointRegistry: Add endpoint - " + endpoint);

+        logger.info("Add endpoint - " + endpoint);

     }

 

     public void addEndpointReference(EndpointReference endpointReference) {

         endpointreferences.add(endpointReference);

-        logger.info("EndpointRegistry: Add endpoint reference - " + endpointReference);

+        logger.info("Add endpoint reference - " + endpointReference);

     }

 

     public void addListener(EndpointListener listener) {

@@ -210,7 +213,7 @@ public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleLi
     public List<Endpoint> findEndpoint(EndpointReference endpointReference) {

         List<Endpoint> foundEndpoints = new ArrayList<Endpoint>();

 

-        logger.info("EndpointRegistry: Find endpoint for reference - " + endpointReference);

+        logger.info("Find endpoint for reference - " + endpointReference);

 

         if (endpointReference.getReference() != null) {

             Endpoint targetEndpoint = endpointReference.getTargetEndpoint();

@@ -219,14 +222,14 @@ public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleLi
                 // TODO: implement more complete matching

                 if (matches(targetEndpoint.getURI(), endpoint.getURI())) {

                     MapEntry entry = map.getInternal(endpoint.getURI());

-                    if (!entry.getPrimary().equals(map.getChannel().getLocalMember(false))) {

+                    if (!isLocal(entry)) {

                         endpoint.setRemote(true);

                     }

                     // if (!entry.isPrimary()) {

-                        endpoint.setExtensionPointRegistry(registry);

+                    endpoint.setExtensionPointRegistry(registry);

                     // }

                     foundEndpoints.add(endpoint);

-                    logger.info("EndpointRegistry: Found endpoint with matching service  - " + endpoint);

+                    logger.info("Found endpoint with matching service  - " + endpoint);

                 }

                 // else the service name doesn't match

             }

@@ -234,6 +237,10 @@ public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleLi
         return foundEndpoints;

     }

 

+    private boolean isLocal(MapEntry entry) {

+        return entry.getPrimary().equals(map.getChannel().getLocalMember(false));

+    }

+

     public List<EndpointReference> findEndpointReference(Endpoint endpoint) {

         return endpointreferences;

     }

@@ -247,7 +254,7 @@ public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleLi
     }

 

     public List<Endpoint> getEndpoints() {

-        return new ArrayList<Endpoint>(map.values());

+        return new ArrayList(map.values());

     }

 

     public List<EndpointListener> getListeners() {

@@ -259,12 +266,12 @@ public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleLi
         for (EndpointListener listener : listeners) {

             listener.endpointRemoved(endpoint);

         }

-        logger.info("EndpointRegistry: Remove endpoint - " + endpoint);

+        logger.info("Remove endpoint - " + endpoint);

     }

 

     public void removeEndpointReference(EndpointReference endpointReference) {

         endpointreferences.remove(endpointReference);

-        logger.info("EndpointRegistry: Remove endpoint reference - " + endpointReference);

+        logger.info("Remove endpoint reference - " + endpointReference);

     }

 

     public void removeListener(EndpointListener listener) {

@@ -282,4 +289,70 @@ public class ReplicatedEndpointRegistry implements EndpointRegistry, LifeCycleLi
         }

     }

 

+    public void entryAdded(Object key, Object value) {

+        MapEntry entry = (MapEntry)value;

+        if (!isLocal(entry)) {

+            logger.info("Remote endpoint added: " + entry.getValue());

+        }

+        Endpoint newEp = (Endpoint)entry.getValue();

+        for (EndpointListener listener : listeners) {

+            listener.endpointAdded(newEp);

+        }

+    }

+

+    public void entryRemoved(Object key, Object value) {

+        MapEntry entry = (MapEntry)value;

+        if (!isLocal(entry)) {

+            logger.info("Remote endpoint removed: " + entry.getValue());

+        }

+        Endpoint oldEp = (Endpoint)entry.getValue();

+        for (EndpointListener listener : listeners) {

+            listener.endpointRemoved(oldEp);

+        }

+    }

+

+    public void entryUpdated(Object key, Object oldValue, Object newValue) {

+        MapEntry oldEntry = (MapEntry)oldValue;

+        MapEntry newEntry = (MapEntry)newValue;

+        if (!isLocal(newEntry)) {

+            logger.info("Remote endpoint updated: " + newEntry.getValue());

+        }

+        Endpoint oldEp = (Endpoint)oldEntry.getValue();

+        Endpoint newEp = (Endpoint)newEntry.getValue();

+        for (EndpointListener listener : listeners) {

+            listener.endpointUpdated(oldEp, newEp);

+        }

+    }

+

+    public static void main(String[] args) throws Exception {

+        //create a channel

+        GroupChannel channel = new GroupChannel();

+        McastService mcastService = (McastService)channel.getMembershipService();

+        mcastService.setPort(MULTICAST_PORT);

+        mcastService.setAddress(MULTICAST_ADDRESS);

+

+        InetAddress localhost = InetAddress.getLocalHost();

+

+        // REVIEW: In my case, there are multiple IP addresses

+        // One for the WIFI and the other one for VPN. For some reason the VPN one doesn't support

+        // Multicast

+        // You can use "route add 228.0.0.0 mask 252.0.0.0 192.168.1.100"

+        // mcastService.setBind("192.168.1.100");

+        channel.start(Channel.DEFAULT);

+        ReplicatedMap map = new ReplicatedMap(null, channel, 50, "01", null);

+        map.put(UUID.randomUUID().toString(), localhost.getHostAddress());

+        for (int i = 0; i < 4; i++) {

+            Thread.sleep(3000);

+            System.out.println(localhost + ": " + map.keySet());

+        }

+        for (Object e : map.entrySetFull()) {

+            Map.Entry en = (Map.Entry)e;

+            AbstractReplicatedMap.MapEntry entry = (AbstractReplicatedMap.MapEntry)en.getValue();

+            System.out.println(entry);

+        }

+        map.breakdown();

+        channel.stop(Channel.DEFAULT);

+    }

+

+

 }

diff --git a/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/ReplicatedMap.java b/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/ReplicatedMap.java
new file mode 100644
index 0000000000..af0bb6fb44
--- /dev/null
+++ b/java/sca/modules/endpoint-tribes/src/main/java/org/apache/tuscany/sca/endpoint/tribes/ReplicatedMap.java
@@ -0,0 +1,119 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.tuscany.sca.endpoint.tribes;
+
+import java.io.Serializable;
+
+import org.apache.catalina.tribes.Channel;
+import org.apache.catalina.tribes.ChannelException;
+import org.apache.catalina.tribes.ChannelListener;
+import org.apache.catalina.tribes.Member;
+import org.apache.catalina.tribes.MembershipListener;
+import org.apache.catalina.tribes.group.RpcCallback;
+
+/**
+ * This file is copied from:
+ * https://svn.apache.org/repos/asf/tomcat/tc6.0.x/tags/TOMCAT_6_0_20/java/org/apache/catalina/tribes/tipis/ReplicatedMap.java
+ *
+ */
+public class ReplicatedMap extends AbstractReplicatedMap implements RpcCallback, ChannelListener, MembershipListener {
+    private static final long serialVersionUID = -6318779627600581121L;
+    protected static org.apache.juli.logging.Log log = org.apache.juli.logging.LogFactory.getLog(ReplicatedMap.class);
+
+    //------------------------------------------------------------------------------
+    //              CONSTRUCTORS / DESTRUCTORS
+    //------------------------------------------------------------------------------
+    /**
+     * Creates a new map
+     * @param channel The channel to use for communication
+     * @param timeout long - timeout for RPC messags
+     * @param mapContextName String - unique name for this map, to allow multiple maps per channel
+     * @param initialCapacity int - the size of this map, see HashMap
+     * @param loadFactor float - load factor, see HashMap
+     */
+    public ReplicatedMap(MapOwner owner,
+                         Channel channel,
+                         long timeout,
+                         String mapContextName,
+                         int initialCapacity,
+                         float loadFactor,
+                         ClassLoader[] cls) {
+        super(owner, channel, timeout, mapContextName, initialCapacity, loadFactor, Channel.SEND_OPTIONS_DEFAULT, cls);
+    }
+
+    /**
+     * Creates a new map
+     * @param channel The channel to use for communication
+     * @param timeout long - timeout for RPC messags
+     * @param mapContextName String - unique name for this map, to allow multiple maps per channel
+     * @param initialCapacity int - the size of this map, see HashMap
+     */
+    public ReplicatedMap(MapOwner owner,
+                         Channel channel,
+                         long timeout,
+                         String mapContextName,
+                         int initialCapacity,
+                         ClassLoader[] cls) {
+        super(owner, channel, timeout, mapContextName, initialCapacity, AbstractReplicatedMap.DEFAULT_LOAD_FACTOR,
+              Channel.SEND_OPTIONS_DEFAULT, cls);
+    }
+
+    /**
+     * Creates a new map
+     * @param channel The channel to use for communication
+     * @param timeout long - timeout for RPC messags
+     * @param mapContextName String - unique name for this map, to allow multiple maps per channel
+     */
+    public ReplicatedMap(MapOwner owner, Channel channel, long timeout, String mapContextName, ClassLoader[] cls) {
+        super(owner, channel, timeout, mapContextName, AbstractReplicatedMap.DEFAULT_INITIAL_CAPACITY,
+              AbstractReplicatedMap.DEFAULT_LOAD_FACTOR, Channel.SEND_OPTIONS_DEFAULT, cls);
+    }
+
+    //------------------------------------------------------------------------------
+    //              METHODS TO OVERRIDE
+    //------------------------------------------------------------------------------
+    protected int getStateMessageType() {
+        return AbstractReplicatedMap.MapMessage.MSG_STATE_COPY;
+    }
+
+    /**
+     * publish info about a map pair (key/value) to other nodes in the cluster
+     * @param key Object
+     * @param value Object
+     * @return Member - the backup node
+     * @throws ChannelException
+     */
+    protected Member[] publishEntryInfo(Object key, Object value) throws ChannelException {
+        if (!(key instanceof Serializable && value instanceof Serializable))
+            return new Member[0];
+        //select a backup node
+        Member[] backup = getMapMembers();
+
+        if (backup == null || backup.length == 0)
+            return null;
+
+        //publish the data out to all nodes
+        MapMessage msg =
+            new MapMessage(getMapContextName(), MapMessage.MSG_COPY, false, (Serializable)key, (Serializable)value,
+                           null, channel.getLocalMember(false), backup);
+
+        getChannel().send(getMapMembers(), msg, getChannelSendOptions());
+
+        return backup;
+    }
+
+}