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fix for: for: https://issues.apache.org/jira/browse/AMQ-3700 

Prevent any calls to wakeup becoming recursive calls into iterate() and instead queue a wakeup so that we don't miss dispatching any messages as things change in the memory usage.

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1241077 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Timothy A. Bish 2012-02-06 16:59:07 +00:00
parent 1a566ecff7
commit a1d5ff0316
1 changed files with 12 additions and 7 deletions
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19
activemq-core/src/main/java/org/apache/activemq/broker/region/Queue.java
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@ -82,8 +82,6 @@ import org.slf4j.MDC;
/**
* The Queue is a List of MessageEntry objects that are dispatched to matching
* subscriptions.
*
*
*/
public class Queue extends BaseDestination implements Task, UsageListener {
protected static final Logger LOG = LoggerFactory.getLogger(Queue.class);
@ -105,12 +103,12 @@ public class Queue extends BaseDestination implements Task, UsageListener {
private MessageGroupMapFactory messageGroupMapFactory = new MessageGroupHashBucketFactory();
final Lock sendLock = new ReentrantLock();
private ExecutorService executor;
protected final Map<MessageId, Runnable> messagesWaitingForSpace = Collections
.synchronizedMap(new LinkedHashMap<MessageId, Runnable>());
private final Map<MessageId, Runnable> messagesWaitingForSpace = new LinkedHashMap<MessageId, Runnable>();
private boolean useConsumerPriority = true;
private boolean strictOrderDispatch = false;
private final QueueDispatchSelector dispatchSelector;
private boolean optimizedDispatch = false;
private boolean iterationRunning = false;
private boolean firstConsumer = false;
private int timeBeforeDispatchStarts = 0;
private int consumersBeforeDispatchStarts = 0;
@ -1403,6 +1401,11 @@ public class Queue extends BaseDestination implements Task, UsageListener {
boolean pageInMoreMessages = false;
synchronized (iteratingMutex) {
// If optimize dispatch is on or this is a slave this method could be called recursively
// we set this state value to short-circuit wakeup in those cases to avoid that as it
// could lead to errors.
iterationRunning = true;
// do early to allow dispatch of these waiting messages
synchronized (messagesWaitingForSpace) {
Iterator<Runnable> it = messagesWaitingForSpace.values().iterator();
@ -1454,14 +1457,14 @@ public class Queue extends BaseDestination implements Task, UsageListener {
messagesLock.readLock().lock();
try{
pageInMoreMessages |= !messages.isEmpty();
}finally {
} finally {
messagesLock.readLock().unlock();
}
pagedInPendingDispatchLock.readLock().lock();
try {
pageInMoreMessages |= !pagedInPendingDispatch.isEmpty();
}finally {
} finally {
pagedInPendingDispatchLock.readLock().unlock();
}
@ -1517,6 +1520,8 @@ public class Queue extends BaseDestination implements Task, UsageListener {
pendingWakeups.decrementAndGet();
}
MDC.remove("activemq.destination");
iterationRunning = false;
return pendingWakeups.get() > 0;
}
}
@ -1677,7 +1682,7 @@ public class Queue extends BaseDestination implements Task, UsageListener {
}
public void wakeup() {
if (optimizedDispatch || isSlave()) {
if ((optimizedDispatch || isSlave()) && !iterationRunning) {
iterate();
pendingWakeups.incrementAndGet();
} else {