diff options
Diffstat (limited to 'java/broker/src/main/java/org/apache/qpid/server/queue/SimpleAMQQueue.java')
| -rw-r--r-- | java/broker/src/main/java/org/apache/qpid/server/queue/SimpleAMQQueue.java | 1174 |
1 files changed, 1174 insertions, 0 deletions
diff --git a/java/broker/src/main/java/org/apache/qpid/server/queue/SimpleAMQQueue.java b/java/broker/src/main/java/org/apache/qpid/server/queue/SimpleAMQQueue.java new file mode 100644 index 0000000000..b028d60b19 --- /dev/null +++ b/java/broker/src/main/java/org/apache/qpid/server/queue/SimpleAMQQueue.java @@ -0,0 +1,1174 @@ +package org.apache.qpid.server.queue; + +import org.apache.qpid.framing.AMQShortString; +import org.apache.qpid.framing.FieldTable; +import org.apache.qpid.server.virtualhost.VirtualHost; +import org.apache.qpid.server.exchange.Exchange; +import org.apache.qpid.server.store.StoreContext; +import org.apache.qpid.server.protocol.AMQProtocolSession; +import org.apache.qpid.server.AMQChannel; +import org.apache.qpid.server.subscription.Subscription; +import org.apache.qpid.server.subscription.SubscriptionList; +import org.apache.qpid.server.output.ProtocolOutputConverter; +import org.apache.qpid.server.management.ManagedObject; +import org.apache.qpid.AMQException; +import org.apache.qpid.configuration.Configured; +import org.apache.log4j.Logger; + +import javax.management.JMException; +import java.util.List; +import java.util.Set; +import java.util.ArrayList; +import java.util.EnumSet; +import java.util.concurrent.CopyOnWriteArrayList; +import java.util.concurrent.Executor; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.concurrent.atomic.AtomicLong; +import java.util.concurrent.atomic.AtomicReference; + +/* +* +* 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. +* +*/ +public class SimpleAMQQueue implements AMQQueue, Subscription.StateListener +{ + private static final Logger _logger = Logger.getLogger(SimpleAMQQueue.class); + + private final AMQShortString _name; + + /** null means shared */ + private final AMQShortString _owner; + + private final boolean _durable; + + /** If true, this queue is deleted when the last subscriber is removed */ + private final boolean _autoDelete; + + private final VirtualHost _virtualHost; + + /** Used to track bindings to exchanges so that on deletion they can easily be cancelled. */ + private final ExchangeBindings _bindings = new ExchangeBindings(this); + + private final AtomicBoolean _deleted = new AtomicBoolean(false); + + private final List<Task> _deleteTaskList = new CopyOnWriteArrayList<Task>(); + + private final AtomicInteger _messageCount = new AtomicInteger(0); + + private final AtomicLong _depth = new AtomicLong(0L); + + + private final AtomicInteger _activeSubscriberCount = new AtomicInteger(); + + private final AtomicBoolean _quiesced = new AtomicBoolean(false); + + /** + * the _enqueueLock is used to control the entry of new messages onto the queue. In normal operation many threads + * may concurrently enqueue messages. However while certain operations are being carried out (e.g. clearing the + * queue), it is important to prevent new messages being added to the queue. To obtain this behaviour we use the + * readLock for shared "enqueue" access and the write lock for the exclusive access. + */ + // private final ReadWriteLock _enqueueLock = new ReentrantReadWriteLock(); + + + private final Lock _subscriberLock = new ReentrantLock(); + +// private final List<Subscription> _subscriberList = new CopyOnWriteArrayList<Subscription>(); + + + private final SubscriptionList _subscriptionList = new SubscriptionList(this); + private final AtomicReference<SubscriptionList.SubscriptionNode> _lastSubscriptionNode = new AtomicReference<SubscriptionList.SubscriptionNode>(_subscriptionList.getHead()); + + private boolean _exclusiveSubscriber; + + + private final QueueEntryList _entries; + + + private final AMQQueueMBean _managedObject; + private final Executor _asyncDelivery; + private final AtomicLong _totalMessagesReceived = new AtomicLong(); + + + + /** max allowed size(KB) of a single message */ + @Configured(path = "maximumMessageSize", defaultValue = "0") + public long _maximumMessageSize; + + /** max allowed number of messages on a queue. */ + @Configured(path = "maximumMessageCount", defaultValue = "0") + public long _maximumMessageCount; + + /** max queue depth for the queue */ + @Configured(path = "maximumQueueDepth", defaultValue = "0") + public long _maximumQueueDepth; + + /** maximum message age before alerts occur */ + @Configured(path = "maximumMessageAge", defaultValue = "0") + public long _maximumMessageAge; + + /** the minimum interval between sending out consequetive alerts of the same type */ + @Configured(path = "minimumAlertRepeatGap", defaultValue = "0") + public long _minimumAlertRepeatGap; + + private final Set<NotificationCheck> _notificationChecks = EnumSet.noneOf(NotificationCheck.class); + + + private final AtomicLong _stateChangeCount = new AtomicLong(Long.MIN_VALUE); + private AtomicReference _asynchronousRunner = new AtomicReference(null); + private AtomicInteger _deliveredMessages = new AtomicInteger(); + + + SimpleAMQQueue(AMQShortString name, boolean durable, AMQShortString owner, boolean autoDelete, VirtualHost virtualHost) + throws AMQException + { + + if (name == null) + { + throw new IllegalArgumentException("Queue name must not be null"); + } + + if (virtualHost == null) + { + throw new IllegalArgumentException("Virtual Host must not be null"); + } + + _name = name; + _durable = durable; + _owner = owner; + _autoDelete = autoDelete; + _virtualHost = virtualHost; + _entries = new QueueEntryList(this); + + _asyncDelivery = AsyncDeliveryConfig.getAsyncDeliveryExecutor(); + + try + { + _managedObject = new AMQQueueMBean(this); + _managedObject.register(); + } + catch (JMException e) + { + throw new AMQException("AMQQueue MBean creation has failed ", e); + } + + + // This ensure that the notification checks for the configured alerts are created. + setMaximumMessageAge(_maximumMessageAge); + setMaximumMessageCount(_maximumMessageCount); + setMaximumMessageSize(_maximumMessageSize); + setMaximumQueueDepth(_maximumQueueDepth); + + } + + // ------ Getters and Setters + + public AMQShortString getName() + { + return _name; + } + + public boolean isDurable() + { + return _durable; + } + + public boolean isAutoDelete() + { + return _autoDelete; + } + + public AMQShortString getOwner() + { + return _owner; + } + + public VirtualHost getVirtualHost() + { + return _virtualHost; + } + + + // ------ bind and unbind + + public void bind(Exchange exchange, AMQShortString routingKey, FieldTable arguments) throws AMQException + { + exchange.registerQueue(routingKey, this, arguments); + if (isDurable() && exchange.isDurable()) + { + _virtualHost.getMessageStore().bindQueue(exchange, routingKey, this, arguments); + } + + _bindings.addBinding(routingKey, arguments, exchange); + } + + public void unBind(Exchange exchange, AMQShortString routingKey, FieldTable arguments) throws AMQException + { + exchange.deregisterQueue(routingKey, this, arguments); + if (isDurable() && exchange.isDurable()) + { + _virtualHost.getMessageStore().unbindQueue(exchange, routingKey, this, arguments); + } + + boolean removed = _bindings.remove(routingKey, arguments, exchange); + if(!removed) + { + _logger.error("Mismatch between queue bindings and exchange record of bindings"); + } + } + + + // ------ Manage Subscriptions + + public void registerSubscription(final Subscription subscription, final boolean exclusive) throws AMQException + { + + + if(_exclusiveSubscriber) + { + throw new ExistingExclusiveSubscription(); + } + + if(exclusive && getConsumerCount() != 0) + { + throw new ExistingSubscriptionPreventsExclusive(); + } + + _exclusiveSubscriber = exclusive; + + _activeSubscriberCount.incrementAndGet(); + subscription.setStateListener(this); + subscription.setQueueContext(null,_entries.getHead()); + + if(!_deleted.get()) + { + subscription.setQueue(this); + _subscriptionList.add(subscription); + if(_deleted.get()) + { + subscription.queueDeleted(this); + } + } + else + { + // TODO + } + + + deliverAsync(); + + } + + public void unregisterSubscription(final Subscription subscription) throws AMQException + { + if(subscription == null) + { + throw new NullPointerException("subscription argument is null"); + } + + + + + boolean removed = _subscriptionList.remove(subscription); + + + + if(removed) + { + subscription.close(); + // No longer can the queue have an exclusive consumer + _exclusiveSubscriber = false; + + + + + + // auto-delete queues must be deleted if there are no remaining subscribers + + if (_autoDelete && getConsumerCount() == 0) + { + if (_logger.isInfoEnabled()) + { + _logger.info("Auto-deleteing queue:" + this); + } + + delete(); + + // we need to manually fire the event to the removed subscription (which was the last one left for this + // queue. This is because the delete method uses the subscription set which has just been cleared + subscription.queueDeleted(this); + } + } + + + } + + + // ------ Enqueue / Dequeue + + public QueueEntry enqueue(StoreContext storeContext, AMQMessage message) throws AMQException + { + // need to get the enqueue lock + + + _messageCount.incrementAndGet(); + + _totalMessagesReceived.incrementAndGet(); + _depth.addAndGet(message.getSize()); + + QueueEntry entry = _entries.add(message); + + /* + + iterate over subscriptions and if any is at the end of the queue and can deliver this message, then deliver the message + + */ + SubscriptionList.SubscriptionNode node = _lastSubscriptionNode.get(); + SubscriptionList.SubscriptionNode nextNode = node.getNext(); + if(nextNode == null) + { + nextNode = _subscriptionList.getHead().getNext(); + } + while(nextNode != null) + { + if(_lastSubscriptionNode.compareAndSet(node, nextNode)) + { + break; + } + else + { + node = _lastSubscriptionNode.get(); + nextNode = node.getNext(); + if(nextNode == null) + { + nextNode = _subscriptionList.getHead().getNext(); + } + } + } + + + + int loops = 2; + + while(!entry.isAcquired() && loops != 0) + { + if(nextNode == null) + { + loops--; + nextNode = _subscriptionList.getHead(); + } + else + { + // if subscription at end, and active, offer + Subscription sub = nextNode.getSubscription(); + synchronized(sub.getSendLock()) + { + if(subscriptionReady(sub, entry) + && !sub.isSuspended() + && sub.isActive()) + { + + if( sub.hasInterest(entry) ) + { + if( !sub.wouldSuspend(entry)) + { + if(!sub.isBrowser() && entry.acquire(sub)) + { + sub.restoreCredit(entry); + } + else + { + deliverMessage(sub, entry); + QueueEntryList.QueueEntryNode queueEntryNode = (QueueEntryList.QueueEntryNode) sub.getQueueContext(); + if(queueEntryNode.getNext() == entry) + { + sub.setQueueContext(queueEntryNode,entry); + } + + } + } + } + else + { + QueueEntryList.QueueEntryNode queueEntryNode = (QueueEntryList.QueueEntryNode) sub.getQueueContext(); + if(queueEntryNode.getNext() == entry) + { + sub.setQueueContext(queueEntryNode,entry); + } + } + } + } + } + nextNode = nextNode.getNext(); + + } + + + + if(entry.immediateAndNotDelivered()) + { + dequeue(storeContext, entry); + } + else if(!entry.isAcquired()) + { + deliverAsync(); + } + + + try + { + _managedObject.checkForNotification(entry.getMessage()); + } + catch (JMException e) + { + throw new AMQException("Unable to get notification from manage queue: " + e, e); + } + + + return entry; + + } + + private void deliverMessage(final Subscription sub, final QueueEntry entry) + throws AMQException + { + _deliveredMessages.incrementAndGet(); + sub.send(entry); + + } + + private boolean subscriptionReady(final Subscription sub, final QueueEntry entry) + { + + QueueEntryList.QueueEntryNode node = (QueueEntryList.QueueEntryNode) sub.getQueueContext(); + while(node.isAcquired() || node.isDeleted() || !sub.hasInterest(node) ) + { + + QueueEntryList.QueueEntryNode newNode = node.getNext(); + if(newNode != null) + { + sub.setQueueContext(node, newNode); + node = (QueueEntryList.QueueEntryNode) sub.getQueueContext(); + } + else + { + break; + } + + } + + return node == entry; + + } + + public void requeue(StoreContext storeContext, QueueEntry entry) throws AMQException + { + + SubscriptionList.SubscriptionNodeIterator subscriberIter = _subscriptionList.iterator(); + // iterate over all the subscribers, and if they are in advance of this queue entry then move them backwards + while(subscriberIter.advance()) + { + Subscription sub = subscriberIter.getNode().getSubscription(); + + // we don't make browsers send the same stuff twice + if(!sub.isBrowser()) + { + QueueEntry subEntry = (QueueEntry) sub.getQueueContext(); + while(entry.compareTo(subEntry)<0) + { + if(sub.setQueueContext(subEntry,entry)) + { + break; + } + else + { + subEntry = (QueueEntry) sub.getQueueContext(); + } + } + } + } + + + deliverAsync(); + + + } + + public void dequeue(StoreContext storeContext, QueueEntry entry) throws FailedDequeueException + { + _messageCount.decrementAndGet(); + _depth.addAndGet(-entry.getMessage().getSize()); + if(entry.acquiredBySubscription()) + { + _deliveredMessages.decrementAndGet(); + } + + try + { + AMQMessage msg = entry.getMessage(); + if(isDurable() && msg.isPersistent()) + { + _virtualHost.getMessageStore().dequeueMessage(storeContext, getName(), msg.getMessageId()); + } + ((QueueEntryList.QueueEntryNode)entry).delete(); + + } + catch (MessageCleanupException e) + { + // Message was dequeued, but could not then be deleted + // though it is no longer referenced. This should be very + // rare and can be detected and cleaned up on recovery or + // done through some form of manual intervention. + _logger.error(e, e); + } + catch (AMQException e) + { + throw new FailedDequeueException(_name.toString(), e); + } + + + } + + public boolean resend(final QueueEntry entry, final Subscription subscription) throws AMQException + { + /* TODO : This is wrong as the subscription may be suspended, we should instead change the state of the message + entry to resend and move back the subscription pointer. */ + + synchronized(subscription.getSendLock()) + { + if(!subscription.isClosed()) + { + deliverMessage(subscription, entry); + return true; + } + else + { + return false; + } + } + } + + + + + + public int getConsumerCount() + { + return _subscriptionList.size(); + } + + public int getActiveConsumerCount() + { + return _activeSubscriberCount.get(); + } + + public boolean isUnused() + { + return getConsumerCount() == 0; + } + + public boolean isEmpty() + { + return getMessageCount() == 0; + } + + public int getMessageCount() + { + return _messageCount.get(); + } + + public long getQueueDepth() + { + return _depth.get(); + } + + public int getUndeliveredMessageCount() + { + int count = getMessageCount() - _deliveredMessages.get(); + if(count < 0) + { + return 0; + } + else + { + return count; + } + } + + + public long getReceivedMessageCount() + { + return _totalMessagesReceived.get(); + } + + public long getOldestMessageArrivalTime() + { + return 0; //To change body of implemented methods use File | Settings | File Templates. + } + + public boolean isDeleted() + { + return _deleted.get(); + } + + + + public List<QueueEntry> getMessagesOnTheQueue() + { + ArrayList<QueueEntry> entryList = new ArrayList<QueueEntry>(); + QueueEntryList.QueueEntryIterator queueListIterator = _entries.iterator(); + while(queueListIterator.advance()) + { + QueueEntryList.QueueEntryNode node = queueListIterator.getNode(); + if(node != null && !node.isDeleted()) + { + entryList.add(node); + } + } + return entryList; + + } + + public void stateChange(Subscription sub, Subscription.State oldState, Subscription.State newState) + { + if(oldState == Subscription.State.ACTIVE && newState != Subscription.State.ACTIVE) + { + _activeSubscriberCount.decrementAndGet(); + + } + else if(newState == Subscription.State.ACTIVE && oldState != Subscription.State.ACTIVE) + { + _activeSubscriberCount.incrementAndGet(); + deliverAsync(); + } + } + + public static interface QueueEntryFilter + { + public boolean accept(QueueEntry entry); + + public boolean filterComplete(); + } + + + + public List<QueueEntry> getMessagesOnTheQueue(final long fromMessageId, final long toMessageId) + { + return getMessagesOnTheQueue(new QueueEntryFilter() + { + + public boolean accept(QueueEntry entry) + { + final long messageId = entry.getMessage().getMessageId(); + return messageId >= fromMessageId && messageId <= toMessageId; + } + + public boolean filterComplete() + { + return false; + } + }); + } + + public QueueEntry getMessageOnTheQueue(final long messageId) + { + List<QueueEntry> entries = getMessagesOnTheQueue(new QueueEntryFilter() + { + private boolean _complete; + + public boolean accept(QueueEntry entry) + { + _complete = entry.getMessage().getMessageId() == messageId; + return _complete; + } + + public boolean filterComplete() + { + return _complete; + } + }); + return entries.isEmpty() ? null : entries.get(0); + } + + + public List<QueueEntry> getMessagesOnTheQueue(QueueEntryFilter filter) + { + ArrayList<QueueEntry> entryList = new ArrayList<QueueEntry>(); + QueueEntryList.QueueEntryIterator queueListIterator = _entries.iterator(); + while(queueListIterator.advance() && !filter.filterComplete()) + { + QueueEntryList.QueueEntryNode node = queueListIterator.getNode(); + if(!node.isDeleted() && filter.accept(node)) + { + entryList.add(node); + } + } + return entryList; + + } + + + public void moveMessagesToAnotherQueue(long fromMessageId, + long toMessageId, + String queueName, + StoreContext storeContext) + { + //To change body of implemented methods use File | Settings | File Templates. + } + + public void copyMessagesToAnotherQueue(long fromMessageId, + long toMessageId, + String queueName, + StoreContext storeContext) + { + //To change body of implemented methods use File | Settings | File Templates. + } + + public void removeMessagesFromQueue(long fromMessageId, long toMessageId, StoreContext storeContext) + { + //To change body of implemented methods use File | Settings | File Templates. + } + + + public void enqueueMovedMessages(final StoreContext storeContext, final List<QueueEntry> foundMessagesList) + { + //To change body of implemented methods use File | Settings | File Templates. + } + + + + + public void quiesce() + { + _quiesced.set(true); + } + + public void start() + { + if(_quiesced.compareAndSet(true,false)) + { + deliverAsync(); + } + } + + + + + // ------ Management functions + + + public void deleteMessageFromTop(StoreContext storeContext) throws AMQException + { + QueueEntryList.QueueEntryIterator queueListIterator = _entries.iterator(); + boolean noDeletes = true; + + while(noDeletes && queueListIterator.advance() ) + { + QueueEntryList.QueueEntryNode node = queueListIterator.getNode(); + if(!node.isDeleted() && !node.acquire(null)) + { + node.dequeue(storeContext); + + node.dispose(storeContext); + + noDeletes = false; + } + + } + } + + public long clearQueue(StoreContext storeContext) throws AMQException + { + + QueueEntryList.QueueEntryIterator queueListIterator = _entries.iterator(); + long count = 0; + + while(queueListIterator.advance()) + { + QueueEntryList.QueueEntryNode node = queueListIterator.getNode(); + if(!node.isDeleted() && !node.acquire(null)) + { + node.dequeue(storeContext); + + node.dispose(storeContext); + + count++; + } + + } + return count; + + } + + + public void addQueueDeleteTask(final Task task) + { + _deleteTaskList.add(task); + } + + public int delete() throws AMQException + { + if (!_deleted.getAndSet(true)) + { + + SubscriptionList.SubscriptionNodeIterator subscriptionIter = _subscriptionList.iterator(); + + while (subscriptionIter.advance()) + { + Subscription s = subscriptionIter.getNode().getSubscription(); + if(s != null) + { + s.queueDeleted(this); + } + } + + _bindings.deregister(); + _virtualHost.getQueueRegistry().unregisterQueue(_name); + + + _managedObject.unregister(); + for (Task task : _deleteTaskList) + { + task.doTask(this); + } + + _deleteTaskList.clear(); + } + return getMessageCount(); + + } + + + public void deliverAsync() + { + _stateChangeCount.incrementAndGet(); + + if(_asynchronousRunner.get() == null) + { + _asyncDelivery.execute(new Runner()); + } + } + + private class Runner implements Runnable + { + public void run() + { + String startName = Thread.currentThread().getName(); + Thread.currentThread().setName("async delivery (Q: " + getName() + " VH: " + _virtualHost.getName() +")"); + try + { + processQueue(this); + } + catch (AMQException e) + { + _logger.error(e); + } + Thread.currentThread().setName(startName); + } + } + + + private void processQueue(Runnable runner) throws AMQException + { + long stateChangeCount; + long previousStateChangeCount = Long.MIN_VALUE; + boolean deliveryIncomplete = true; + + int extraLoops = 1; + + while(((previousStateChangeCount != (stateChangeCount = _stateChangeCount.get())) || deliveryIncomplete ) && _asynchronousRunner.compareAndSet(null,runner)) + { + // we want to have one extra loop after the every subscription has reached the point where it cannot move + // further, just in case the advance of one subscription in the last loop allows a different subscription to + // move forward in the next iteration + + if(previousStateChangeCount != stateChangeCount) + { + extraLoops = 1; + } + + previousStateChangeCount = stateChangeCount; + deliveryIncomplete = _subscriptionList.size() != 0; + boolean done = true; + + + SubscriptionList.SubscriptionNodeIterator subscriptionIter = _subscriptionList.iterator(); + //iterate over the subscribers and try to advance their pointer + while(subscriptionIter.advance()) + { + Subscription sub = subscriptionIter.getNode().getSubscription(); + if(sub != null) + { + synchronized(sub.getSendLock()) + { + if(sub.isActive()) + { + boolean advanced = false; + + QueueEntryList.QueueEntryNode node = (QueueEntryList.QueueEntryNode) sub.getQueueContext(); + while(node.isAcquired() || node.isDeleted() || node.expired()) + { + if(!node.isAcquired() && !node.isDeleted() && node.expired()) + { + if(node.acquire(null)) + { + final StoreContext reapingStoreContext = new StoreContext(); + node.dequeue(reapingStoreContext); + node.dispose(reapingStoreContext); + + } + } + QueueEntryList.QueueEntryNode newNode = node.getNext(); + if(newNode != null) + { + sub.setQueueContext(node, newNode); + node = (QueueEntryList.QueueEntryNode) sub.getQueueContext(); + } + else + { + break; + } + + } + if(!(node.isAcquired() || node.isDeleted())) + { + if(!sub.isSuspended()) + { + if(sub.hasInterest(node)) + { + if(!sub.wouldSuspend(node)) + { + if(!sub.isBrowser() && node.acquire(sub)) + { + sub.restoreCredit(node); + } + else + { + deliverMessage(sub, node); + + if(sub.isBrowser()) + { + QueueEntryList.QueueEntryNode newNode = node.getNext(); + + if(newNode != null) + { + sub.setQueueContext(node, newNode); + node = (QueueEntryList.QueueEntryNode) sub.getQueueContext(); + advanced = true; + } + + + } + } + done = false; + } + } + else + { + // this subscription is not interested in this node so we can skip over it + QueueEntryList.QueueEntryNode newNode = node.getNext(); + if(newNode != null) + { + sub.setQueueContext(node, newNode); + } + } + } + } + final boolean atTail = (node.getNext() == null); + + done = done && atTail; + + if(atTail && !advanced && sub.isAutoClose()) + { + unregisterSubscription(sub); + + ProtocolOutputConverter converter = sub.getChannel().getProtocolSession().getProtocolOutputConverter(); + converter.confirmConsumerAutoClose(sub.getChannel().getChannelId(), sub.getConumerTag()); + + } + + } + } + } + if(done) + { + if(extraLoops == 0) + { + deliveryIncomplete = false; + } + else + { + extraLoops--; + } + } + else + { + extraLoops = 1; + } + } + + + + _asynchronousRunner.set(null); + } + + + } + + public boolean performGet(final AMQProtocolSession session, final AMQChannel channel, final boolean b) + throws AMQException + { + return false; //To change body of implemented methods use File | Settings | File Templates. + } + + + public void removeExpiredIfNoSubscribers() throws AMQException + { + + final StoreContext storeContext = new StoreContext(); + + QueueEntryList.QueueEntryIterator queueListIterator = _entries.iterator(); + + while(queueListIterator.advance()) + { + QueueEntryList.QueueEntryNode node = queueListIterator.getNode(); + if(!node.isDeleted() && node.expired() && node.acquire(null)) + { + + node.dequeue(storeContext); + + node.dispose(storeContext); + + } + + } + + } + + + public long getMinimumAlertRepeatGap() + { + return _minimumAlertRepeatGap; + } + + public void setMinimumAlertRepeatGap(long minimumAlertRepeatGap) + { + _minimumAlertRepeatGap = minimumAlertRepeatGap; + } + + public long getMaximumMessageAge() + { + return _maximumMessageAge; + } + + public void setMaximumMessageAge(long maximumMessageAge) + { + _maximumMessageAge = maximumMessageAge; + if(maximumMessageAge == 0L) + { + _notificationChecks.remove(NotificationCheck.MESSAGE_AGE_ALERT); + } + else + { + _notificationChecks.add(NotificationCheck.MESSAGE_AGE_ALERT); + } + } + + public long getMaximumMessageCount() + { + return _maximumMessageCount; + } + + public void setMaximumMessageCount(final long maximumMessageCount) + { + _maximumMessageCount = maximumMessageCount; + if(maximumMessageCount == 0L) + { + _notificationChecks.remove(NotificationCheck.MESSAGE_COUNT_ALERT); + } + else + { + _notificationChecks.add(NotificationCheck.MESSAGE_COUNT_ALERT); + } + + + + } + + public long getMaximumQueueDepth() + { + return _maximumQueueDepth; + } + + // Sets the queue depth, the max queue size + public void setMaximumQueueDepth(final long maximumQueueDepth) + { + _maximumQueueDepth = maximumQueueDepth; + if(maximumQueueDepth == 0L) + { + _notificationChecks.remove(NotificationCheck.QUEUE_DEPTH_ALERT); + } + else + { + _notificationChecks.add(NotificationCheck.QUEUE_DEPTH_ALERT); + } + + } + + public long getMaximumMessageSize() + { + return _maximumMessageSize; + } + + public void setMaximumMessageSize(final long maximumMessageSize) + { + _maximumMessageSize = maximumMessageSize; + if(maximumMessageSize == 0L) + { + _notificationChecks.remove(NotificationCheck.MESSAGE_SIZE_ALERT); + } + else + { + _notificationChecks.add(NotificationCheck.MESSAGE_SIZE_ALERT); + } + } + + + public Set<NotificationCheck> getNotificationChecks() + { + return _notificationChecks; + } + + + + + + public ManagedObject getManagedObject() + { + return _managedObject; + } + + public int compareTo(final Object o) + { + return _name.compareTo(((AMQQueue) o).getName()); + } +}
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