1 files changed, 218 insertions, 0 deletions
diff --git a/tags/java/sca/2.0-M3-RC4/modules/core/src/main/java/org/apache/tuscany/sca/core/conversation/impl/ConversationManagerImpl.java b/tags/java/sca/2.0-M3-RC4/modules/core/src/main/java/org/apache/tuscany/sca/core/conversation/impl/ConversationManagerImpl.java
new file mode 100644
index 0000000000..e23659b990
--- /dev/null
+++ b/tags/java/sca/2.0-M3-RC4/modules/core/src/main/java/org/apache/tuscany/sca/core/conversation/impl/ConversationManagerImpl.java
@@ -0,0 +1,218 @@
+/*
+ * 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.core.conversation.impl;
+
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.tuscany.sca.core.conversation.ConversationExt;
+import org.apache.tuscany.sca.core.conversation.ConversationListener;
+import org.apache.tuscany.sca.core.conversation.ConversationManager;
+import org.apache.tuscany.sca.core.conversation.ConversationState;
+
+/**
+ * @version $Rev$ $Date$
+ */
+public class ConversationManagerImpl implements ConversationManager {
+
+    private List<ConversationListener> listeners = Collections.synchronizedList(new ArrayList<ConversationListener>());
+    private Map<Object, ConversationExt> conversations = new ConcurrentHashMap<Object, ConversationExt>();
+
+    /**
+     * the default max age. this is set to 1 hour
+     */
+    private static final long DEFAULT_MAX_AGE = 60 * 60 * 1000;;
+
+    /**
+     * the default max idle time. this is set to 1 hour
+     */
+    private static final long DEFAULT_MAX_IDLE_TIME = 60 * 60 * 1000;
+
+    /**
+     * the globally used max age
+     */
+    private final long maxAge;
+
+    /**
+     * the globally used max idle time
+     */
+    private final long maxIdleTime;
+
+    /**
+     * the reaper thread
+     */
+    private final ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor();
+
+    /**
+     * constructor
+     */
+    public ConversationManagerImpl() {
+        long mit = DEFAULT_MAX_IDLE_TIME;
+        long ma = DEFAULT_MAX_AGE;
+
+        // Allow privileged access to read system property. Requires PropertyPermission in security
+        // policy.
+        String aProperty = AccessController.doPrivileged(new PrivilegedAction<String>() {
+            public String run() {
+                return System.getProperty(ConversationManager.class.getName() + ".MaxIdleTime");
+            }
+        });
+        if (aProperty != null) {
+            try {
+                mit = Long.parseLong(aProperty) * 1000;
+            } catch (NumberFormatException nfe) {
+                // Ignore
+            }
+        }
+
+        // Allow privileged access to read system property. Requires PropertyPermission in security
+        // policy.
+        aProperty = AccessController.doPrivileged(new PrivilegedAction<String>() {
+            public String run() {
+                return System.getProperty(ConversationManager.class.getName() + ".MaxAge");
+            }
+        });
+        if (aProperty != null) {
+            try {
+                ma = Long.parseLong(aProperty) * 1000;
+            } catch (NumberFormatException nfe) {
+                // Ignore
+            }
+        }
+
+        maxAge = ma;
+        maxIdleTime = mit;
+    }
+
+    /**
+     * @see org.apache.tuscany.sca.core.conversation.ConversationManager#addListener(org.apache.tuscany.sca.core.conversation.ConversationListener)
+     */
+    public void addListener(ConversationListener listener) {
+        listeners.add(listener);
+    }
+
+    /**
+     * @see org.apache.tuscany.sca.core.conversation.ConversationManager#endConversation(org.apache.tuscany.sca.core.conversation.ConversationExt)
+     */
+    public void endConversation(Object conversationID) {
+        ConversationExt conv = getConversation(conversationID);
+        if (conv != null) {
+            conv.setState(ConversationState.ENDED);
+            for (ConversationListener listener : listeners) {
+                listener.conversationEnded(conv);
+            }
+            conv.setConversationID(null);
+            conversations.remove(conversationID);
+        } else {
+            throw new IllegalStateException("Conversation " + conversationID + " doesn't exist.");
+        }
+    }
+
+    public void expireConversation(Object conversationID) {
+        ConversationExt conv = getConversation(conversationID);
+        if (conv != null) {
+            for (ConversationListener listener : listeners) {
+                listener.conversationExpired(conv);
+            }
+            conversations.remove(conversationID);
+        } else {
+            throw new IllegalStateException("Conversation " + conversationID + " doesn't exist.");
+        }
+
+    }
+
+    /**
+     * @see org.apache.tuscany.sca.core.conversation.ConversationManager#getConversation(java.lang.Object)
+     */
+    public ConversationExt getConversation(Object conversationID) {
+        // ConcurrentHashMap cannot take null key
+        return conversationID == null ? null : conversations.get(conversationID);
+    }
+
+    /**
+     * @see org.apache.tuscany.sca.core.conversation.ConversationManager#removeListener(org.apache.tuscany.sca.core.conversation.ConversationListener)
+     */
+    public void removeListener(ConversationListener listener) {
+        listeners.remove(listener);
+    }
+
+    /**
+     * starts the reaper thread
+     */
+    public void scheduleConversation(ExtendedConversationImpl aConversation, long time) {
+        this.scheduler.schedule(aConversation, time, TimeUnit.MILLISECONDS);
+    }
+
+    /**
+     * stops the reaper thread
+     */
+    public synchronized void stopReaper() {
+
+        // Prevent the scheduler from submitting any additional reapers, 
+        // initiate an orderly shutdown if a reaper task is in progress. 
+        this.scheduler.shutdown();
+    }
+
+    /**
+     * @see org.apache.tuscany.sca.core.conversation.ConversationManager#startConversation(java.lang.Object)
+     */
+    public ConversationExt startConversation(Object conversationID) {
+
+        if (conversationID == null) {
+            conversationID = UUID.randomUUID().toString();
+        }
+        ConversationExt conversation = getConversation(conversationID);
+        if (conversation != null && conversation.getState() != ConversationState.ENDED) {
+            throw new IllegalStateException(conversation + " already exists.");
+        }
+
+        conversation = new ExtendedConversationImpl(this, conversationID, ConversationState.STARTED);
+        conversations.put(conversationID, conversation);
+        for (ConversationListener listener : listeners) {
+            listener.conversationStarted(conversation);
+        }
+        return conversation;
+    }
+
+    /**
+     * return the default max idle time
+     * @param impProvider the implementation Provider to extract any ConversationAttribute details
+     */
+    public long getMaxIdleTime() {
+        return maxIdleTime;
+    }
+
+    /**
+     * returns the default max age
+     * @param impProvider the implementation Provider to extract any ConversationAttribute details
+     */
+    public long getMaxAge() {
+        return maxAge;
+    }
+}