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/*
* 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;
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;
/**
* @version $Rev$ $Date$
*/
public class ConversationManagerImpl implements ConversationManager {
private List<ConversationListener> listeners = Collections.synchronizedList(new ArrayList<ConversationListener>());
private Map<Object, ExtendedConversation> conversations = new ConcurrentHashMap<Object, ExtendedConversation>();
/**
* 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;
/**
* constructor
*/
public ConversationManagerImpl() {
long mit = DEFAULT_MAX_IDLE_TIME;
long ma = DEFAULT_MAX_AGE;
scheduler = Executors.newSingleThreadScheduledExecutor();
// 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("org.apache.tuscany.sca.core.scope.ConversationalScopeContainer.MaxIdleTime");
}
});
if (aProperty != null) {
try {
mit = (new Long(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("org.apache.tuscany.sca.core.scope.ConversationalScopeContainer.MaxAge");
}
});
if (aProperty != null) {
try {
ma = (new Long(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.ExtendedConversation)
*/
public void endConversation(Object conversationID) {
ExtendedConversation 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) {
ExtendedConversation 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 ExtendedConversation 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 ExtendedConversation startConversation(Object conversationID) {
if (conversationID == null) {
conversationID = UUID.randomUUID().toString();
}
ExtendedConversation 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;
}
public void destroy() {
// REVIEW: A more graceful way?
scheduler.shutdownNow();
this.listeners.clear();
this.conversations.clear();
}
}
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