@Override
protected void handleMessageInternal(Message<?> message) throws Exception {
Object correlationKey = correlationStrategy.getCorrelationKey(message);
Assert.state(
correlationKey != null,
"Null correlation not allowed. Maybe the CorrelationStrategy is failing?");
if (logger.isDebugEnabled()) {
logger.debug("Handling message with correlationKey [" + correlationKey + "]: " + message);
}
UUID groupIdUuid = UUIDConverter.getUUID(correlationKey);
Lock lock = this.lockRegistry.obtain(groupIdUuid.toString());
lock.lockInterruptibly();
try {
ScheduledFuture<?> scheduledFuture = this.expireGroupScheduledFutures.remove(groupIdUuid);
if (scheduledFuture != null) {
boolean canceled = scheduledFuture.cancel(true);
if (canceled && logger.isDebugEnabled()) {
logger.debug(
"Cancel 'forceComplete' scheduling for MessageGroup with Correlation Key [ "
+ correlationKey
+ "].");
}
}
MessageGroup messageGroup = messageStore.getMessageGroup(correlationKey);
if (this.sequenceAware) {
messageGroup = new SequenceAwareMessageGroup(messageGroup);
}
if (!messageGroup.isComplete() && messageGroup.canAdd(message)) {
if (logger.isTraceEnabled()) {
logger.trace("Adding message to group [ " + messageGroup + "]");
}
messageGroup = this.store(correlationKey, message);
if (releaseStrategy.canRelease(messageGroup)) {
Collection<Message<?>> completedMessages = null;
try {
completedMessages = this.completeGroup(message, correlationKey, messageGroup);
} finally {
// Always clean up even if there was an exception
// processing messages
this.afterRelease(messageGroup, completedMessages);
}
} else {
scheduleGroupToForceComplete(messageGroup);
}
} else {
discardMessage(message);
}
} finally {
lock.unlock();
}
}
protected void forceComplete(MessageGroup group) {
Object correlationKey = group.getGroupId();
// UUIDConverter is no-op if already converted
Lock lock = this.lockRegistry.obtain(UUIDConverter.getUUID(correlationKey).toString());
boolean removeGroup = true;
try {
lock.lockInterruptibly();
try {
ScheduledFuture<?> scheduledFuture =
this.expireGroupScheduledFutures.remove(UUIDConverter.getUUID(correlationKey));
if (scheduledFuture != null) {
boolean canceled = scheduledFuture.cancel(false);
if (canceled && logger.isDebugEnabled()) {
logger.debug("Cancel 'forceComplete' scheduling for MessageGroup [ " + group + "].");
}
}
MessageGroup groupNow = group;
/*
* If the group argument is not already complete,
* re-fetch it because it might have changed while we were waiting on
* its lock. If the last modified timestamp changed, defer the completion
* because the selection condition may have changed such that the group
* would no longer be eligible. If the timestamp changed, it's a completely new
* group and should not be reaped on this cycle.
*
* If the group argument is already complete, do not re-fetch.
* Note: not all message stores provide a direct reference to its internal
* group so the initial 'isComplete()` will only return true for those stores if
* the group was already complete at the time of its selection as a candidate.
*
* If the group is marked complete, only consider it
* for reaping if it's empty (and both timestamps are unaltered).
*/
if (!group.isComplete()) {
groupNow = this.messageStore.getMessageGroup(correlationKey);
}
long lastModifiedNow = groupNow.getLastModified();
int groupSize = groupNow.size();
if ((!groupNow.isComplete() || groupSize == 0)
&& group.getLastModified() == lastModifiedNow
&& group.getTimestamp() == groupNow.getTimestamp()) {
if (groupSize > 0) {
if (releaseStrategy.canRelease(groupNow)) {
completeGroup(correlationKey, groupNow);
} else {
expireGroup(correlationKey, groupNow);
}
if (!this.expireGroupsUponTimeout) {
afterRelease(groupNow, groupNow.getMessages(), true);
removeGroup = false;
}
} else {
/*
* By default empty groups are removed on the same schedule as non-empty
* groups. A longer timeout for empty groups can be enabled by
* setting minimumTimeoutForEmptyGroups.
*/
removeGroup =
lastModifiedNow <= (System.currentTimeMillis() - this.minimumTimeoutForEmptyGroups);
if (removeGroup && logger.isDebugEnabled()) {
logger.debug("Removing empty group: " + correlationKey);
}
}
} else {
removeGroup = false;
if (logger.isDebugEnabled()) {
logger.debug(
"Group expiry candidate ("
+ correlationKey
+ ") has changed - it may be reconsidered for a future expiration");
}
}
} catch (MessageDeliveryException e) {
removeGroup = false;
if (logger.isDebugEnabled()) {
logger.debug(
"Group expiry candidate ("
+ correlationKey
+ ") has been affected by MessageDeliveryException - "
+ "it may be reconsidered for a future expiration one more time");
}
throw e;
} finally {
try {
if (removeGroup) {
this.remove(group);
}
} finally {
lock.unlock();
}
}
} catch (InterruptedException ie) {
Thread.currentThread().interrupt();
logger.debug("Thread was interrupted while trying to obtain lock");
}
}
