/*
* 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.qpid.server.queue;
import java.security.AccessControlException;
import java.security.AccessController;
import java.security.Principal;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ConcurrentSkipListSet;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.Executor;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import javax.security.auth.Subject;
import org.apache.log4j.Logger;
import org.apache.qpid.pool.ReferenceCountingExecutorService;
import org.apache.qpid.server.binding.BindingImpl;
import org.apache.qpid.server.configuration.IllegalConfigurationException;
import org.apache.qpid.server.connection.SessionPrincipal;
import org.apache.qpid.server.consumer.ConsumerImpl;
import org.apache.qpid.server.consumer.ConsumerTarget;
import org.apache.qpid.server.exchange.ExchangeImpl;
import org.apache.qpid.server.filter.FilterManager;
import org.apache.qpid.server.logging.EventLogger;
import org.apache.qpid.server.logging.LogMessage;
import org.apache.qpid.server.logging.LogSubject;
import org.apache.qpid.server.logging.messages.QueueMessages;
import org.apache.qpid.server.logging.subjects.QueueLogSubject;
import org.apache.qpid.server.message.InstanceProperties;
import org.apache.qpid.server.message.MessageDeletedException;
import org.apache.qpid.server.message.MessageInstance;
import org.apache.qpid.server.message.MessageReference;
import org.apache.qpid.server.message.MessageSource;
import org.apache.qpid.server.message.ServerMessage;
import org.apache.qpid.server.model.AbstractConfiguredObject;
import org.apache.qpid.server.model.Binding;
import org.apache.qpid.server.model.ConfigurationChangeListener;
import org.apache.qpid.server.model.ConfiguredObject;
import org.apache.qpid.server.model.Exchange;
import org.apache.qpid.server.model.ExclusivityPolicy;
import org.apache.qpid.server.model.LifetimePolicy;
import org.apache.qpid.server.model.ManagedAttributeField;
import org.apache.qpid.server.model.Queue;
import org.apache.qpid.server.model.QueueNotificationListener;
import org.apache.qpid.server.model.State;
import org.apache.qpid.server.model.StateTransition;
import org.apache.qpid.server.protocol.AMQConnectionModel;
import org.apache.qpid.server.protocol.AMQSessionModel;
import org.apache.qpid.server.security.SecurityManager;
import org.apache.qpid.server.security.auth.AuthenticatedPrincipal;
import org.apache.qpid.server.store.MessageDurability;
import org.apache.qpid.server.store.StorableMessageMetaData;
import org.apache.qpid.server.store.StoredMessage;
import org.apache.qpid.server.txn.AutoCommitTransaction;
import org.apache.qpid.server.txn.LocalTransaction;
import org.apache.qpid.server.txn.ServerTransaction;
import org.apache.qpid.server.util.Action;
import org.apache.qpid.server.util.ConnectionScopedRuntimeException;
import org.apache.qpid.server.util.Deletable;
import org.apache.qpid.server.util.MapValueConverter;
import org.apache.qpid.server.util.ServerScopedRuntimeException;
import org.apache.qpid.server.util.StateChangeListener;
import org.apache.qpid.server.virtualhost.VirtualHostImpl;
import org.apache.qpid.transport.TransportException;
public abstract class AbstractQueue<X extends AbstractQueue<X>>
extends AbstractConfiguredObject<X>
implements AMQQueue<X>,
StateChangeListener<QueueConsumer<?>, State>,
MessageGroupManager.ConsumerResetHelper
{
private static final Logger _logger = Logger.getLogger(AbstractQueue.class);
public static final String SHARED_MSG_GROUP_ARG_VALUE = "1";
private static final QueueNotificationListener NULL_NOTIFICATION_LISTENER = new QueueNotificationListener()
{
@Override
public void notifyClients(final NotificationCheck notification,
final Queue queue,
final String notificationMsg)
{
}
};
private static final long INITIAL_TARGET_QUEUE_SIZE = 102400l;
private final VirtualHostImpl _virtualHost;
private final DeletedChildListener _deletedChildListener = new DeletedChildListener();
@ManagedAttributeField( beforeSet = "preSetAlternateExchange", afterSet = "postSetAlternateExchange")
private Exchange _alternateExchange;
private final QueueConsumerList _consumerList = new QueueConsumerList();
private volatile QueueConsumer<?> _exclusiveSubscriber;
private final AtomicInteger _atomicQueueCount = new AtomicInteger(0);
private final AtomicLong _atomicQueueSize = new AtomicLong(0L);
private final AtomicLong _targetQueueSize = new AtomicLong(INITIAL_TARGET_QUEUE_SIZE);
private final AtomicInteger _activeSubscriberCount = new AtomicInteger();
private final AtomicLong _totalMessagesReceived = new AtomicLong();
private final AtomicLong _dequeueCount = new AtomicLong();
private final AtomicLong _dequeueSize = new AtomicLong();
private final AtomicLong _enqueueCount = new AtomicLong();
private final AtomicLong _enqueueSize = new AtomicLong();
private final AtomicLong _persistentMessageEnqueueSize = new AtomicLong();
private final AtomicLong _persistentMessageDequeueSize = new AtomicLong();
private final AtomicLong _persistentMessageEnqueueCount = new AtomicLong();
private final AtomicLong _persistentMessageDequeueCount = new AtomicLong();
private final AtomicLong _unackedMsgCount = new AtomicLong(0);
private final AtomicLong _unackedMsgBytes = new AtomicLong();
private final AtomicInteger _bindingCountHigh = new AtomicInteger();
/** max allowed size(KB) of a single message */
@ManagedAttributeField( afterSet = "updateAlertChecks" )
private long _alertThresholdMessageSize;
/** max allowed number of messages on a queue. */
@ManagedAttributeField( afterSet = "updateAlertChecks" )
private long _alertThresholdQueueDepthMessages;
/** max queue depth for the queue */
@ManagedAttributeField( afterSet = "updateAlertChecks" )
private long _alertThresholdQueueDepthBytes;
/** maximum message age before alerts occur */
@ManagedAttributeField( afterSet = "updateAlertChecks" )
private long _alertThresholdMessageAge;
/** the minimum interval between sending out consecutive alerts of the same type */
@ManagedAttributeField
private long _alertRepeatGap;
@ManagedAttributeField
private long _queueFlowControlSizeBytes;
@ManagedAttributeField( afterSet = "checkCapacity" )
private long _queueFlowResumeSizeBytes;
@ManagedAttributeField
private ExclusivityPolicy _exclusive;
@ManagedAttributeField
private MessageDurability _messageDurability;
private Object _exclusiveOwner; // could be connection, session, Principal or a String for the container name
private final Set<NotificationCheck> _notificationChecks =
Collections.synchronizedSet(EnumSet.noneOf(NotificationCheck.class));
private int _maxAsyncDeliveries;
private final AtomicLong _stateChangeCount = new AtomicLong(Long.MIN_VALUE);
private final Executor _asyncDelivery;
private AtomicInteger _deliveredMessages = new AtomicInteger();
private AtomicBoolean _stopped = new AtomicBoolean(false);
private final Set<AMQSessionModel> _blockedChannels = new ConcurrentSkipListSet<AMQSessionModel>();
private final AtomicBoolean _deleted = new AtomicBoolean(false);
private final List<Action<? super AMQQueue>> _deleteTaskList =
new CopyOnWriteArrayList<Action<? super AMQQueue>>();
private LogSubject _logSubject;
@ManagedAttributeField
private boolean _noLocal;
private final AtomicBoolean _overfull = new AtomicBoolean(false);
private final CopyOnWriteArrayList<BindingImpl> _bindings = new CopyOnWriteArrayList<BindingImpl>();
private Map<String, Object> _arguments;
/** the maximum delivery count for each message on this queue or 0 if maximum delivery count is not to be enforced. */
@ManagedAttributeField
private int _maximumDeliveryAttempts;
private MessageGroupManager _messageGroupManager;
private final Collection<ConsumerRegistrationListener<? super MessageSource>> _consumerListeners =
new ArrayList<ConsumerRegistrationListener<? super MessageSource>>();
private QueueNotificationListener _notificationListener;
private final long[] _lastNotificationTimes = new long[NotificationCheck.values().length];
@ManagedAttributeField
private String _messageGroupKey;
@ManagedAttributeField
private boolean _messageGroupSharedGroups;
@ManagedAttributeField
private String _messageGroupDefaultGroup;
@ManagedAttributeField
private int _maximumDistinctGroups;
@ManagedAttributeField
private long _minimumMessageTtl;
@ManagedAttributeField
private long _maximumMessageTtl;
private final AtomicBoolean _recovering = new AtomicBoolean(true);
private final ConcurrentLinkedQueue<EnqueueRequest> _postRecoveryQueue = new ConcurrentLinkedQueue<>();
protected AbstractQueue(Map<String, Object> attributes, VirtualHostImpl virtualHost)
{
super(parentsMap(virtualHost), attributes);
_virtualHost = virtualHost;
_asyncDelivery = ReferenceCountingExecutorService.getInstance().acquireExecutorService();
}
@Override
protected void validateOnCreate()
{
_virtualHost.getSecurityManager().authoriseCreateQueue(this);
}
@Override
protected void onCreate()
{
super.onCreate();
if(isDurable() && (getLifetimePolicy() == LifetimePolicy.DELETE_ON_CONNECTION_CLOSE
|| getLifetimePolicy() == LifetimePolicy.DELETE_ON_SESSION_END))
{
Subject.doAs(SecurityManager.getSubjectWithAddedSystemRights(),
new PrivilegedAction<Object>()
{
@Override
public Object run()
{
setAttribute(AbstractConfiguredObject.DURABLE, true, false);
return null;
}
});
}
if (isDurable())
{
_virtualHost.getDurableConfigurationStore().create(asObjectRecord());
}
else if(getMessageDurability() != MessageDurability.NEVER)
{
Subject.doAs(SecurityManager.getSubjectWithAddedSystemRights(),
new PrivilegedAction<Object>()
{
@Override
public Object run()
{
setAttribute(Queue.MESSAGE_DURABILITY, getMessageDurability(), MessageDurability.NEVER);
return null;
}
});
}
_recovering.set(false);
}
@Override
public void onValidate()
{
super.onValidate();
if (_queueFlowResumeSizeBytes > _queueFlowControlSizeBytes)
{
throw new IllegalConfigurationException("Flow resume size can't be greater than flow control size");
}
}
@Override
protected void onOpen()
{
super.onOpen();
Map<String,Object> attributes = getActualAttributes();
final LinkedHashMap<String, Object> arguments = new LinkedHashMap<String, Object>(attributes);
arguments.put(Queue.EXCLUSIVE, _exclusive);
arguments.put(Queue.LIFETIME_POLICY, getLifetimePolicy());
_arguments = Collections.synchronizedMap(arguments);
_logSubject = new QueueLogSubject(this);
Subject activeSubject = Subject.getSubject(AccessController.getContext());
Set<SessionPrincipal> sessionPrincipals = activeSubject == null ? Collections.<SessionPrincipal>emptySet() : activeSubject.getPrincipals(SessionPrincipal.class);
AMQSessionModel<?,?> sessionModel;
if(sessionPrincipals.isEmpty())
{
sessionModel = null;
}
else
{
final SessionPrincipal sessionPrincipal = sessionPrincipals.iterator().next();
sessionModel = sessionPrincipal.getSession();
}
if(sessionModel != null)
{
switch(_exclusive)
{
case PRINCIPAL:
_exclusiveOwner = sessionModel.getConnectionModel().getAuthorizedPrincipal();
if(isDurable())
{
_virtualHost.getDurableConfigurationStore().update(false,asObjectRecord());
}
break;
case CONTAINER:
_exclusiveOwner = sessionModel.getConnectionModel().getRemoteContainerName();
if(isDurable())
{
_virtualHost.getDurableConfigurationStore().update(false,asObjectRecord());
}
break;
case CONNECTION:
_exclusiveOwner = sessionModel.getConnectionModel();
addExclusivityConstraint(sessionModel.getConnectionModel());
break;
case SESSION:
_exclusiveOwner = sessionModel;
addExclusivityConstraint(sessionModel);
break;
case NONE:
case LINK:
// nothing to do as if link no link associated until there is a consumer associated
break;
default:
throw new ServerScopedRuntimeException("Unknown exclusivity policy: "
+ _exclusive
+ " this is a coding error inside Qpid");
}
}
else if(_exclusive == ExclusivityPolicy.PRINCIPAL)
{
String owner = MapValueConverter.getStringAttribute(Queue.OWNER, attributes, null);
if(owner != null)
{
_exclusiveOwner = new AuthenticatedPrincipal(owner);
}
}
else if(_exclusive == ExclusivityPolicy.CONTAINER)
{
String owner = MapValueConverter.getStringAttribute(Queue.OWNER, attributes, null);
if(owner != null)
{
_exclusiveOwner = owner;
}
}
if(getLifetimePolicy() == LifetimePolicy.DELETE_ON_CONNECTION_CLOSE)
{
if(sessionModel != null)
{
addLifetimeConstraint(sessionModel.getConnectionModel());
}
else
{
throw new IllegalArgumentException("Queues created with a lifetime policy of "
+ getLifetimePolicy()
+ " must be created from a connection.");
}
}
else if(getLifetimePolicy() == LifetimePolicy.DELETE_ON_SESSION_END)
{
if(sessionModel != null)
{
addLifetimeConstraint(sessionModel);
}
else
{
throw new IllegalArgumentException("Queues created with a lifetime policy of "
+ getLifetimePolicy()
+ " must be created from a connection.");
}
}
// Log the creation of this Queue.
// The priorities display is toggled on if we set priorities > 0
getEventLogger().message(_logSubject,
getCreatedLogMessage());
if(getMessageGroupKey() != null)
{
if(isMessageGroupSharedGroups())
{
_messageGroupManager =
new DefinedGroupMessageGroupManager(getMessageGroupKey(), getMessageGroupDefaultGroup(), this);
}
else
{
_messageGroupManager = new AssignedConsumerMessageGroupManager(getMessageGroupKey(), getMaximumDistinctGroups());
}
}
else
{
_messageGroupManager = null;
}
_maxAsyncDeliveries = getContextValue(Integer.class, Queue.MAX_ASYNCHRONOUS_DELIVERIES);
updateAlertChecks();
}
protected LogMessage getCreatedLogMessage()
{
String ownerString = getOwner();
return QueueMessages.CREATED(ownerString,
0,
ownerString != null,
getLifetimePolicy() != LifetimePolicy.PERMANENT,
isDurable(),
!isDurable(),
false);
}
private void addLifetimeConstraint(final Deletable<? extends Deletable> lifetimeObject)
{
final Action<Deletable> deleteQueueTask = new Action<Deletable>()
{
@Override
public void performAction(final Deletable object)
{
Subject.doAs(SecurityManager.getSubjectWithAddedSystemRights(),
new PrivilegedAction<Void>()
{
@Override
public Void run()
{
getVirtualHost().removeQueue(AbstractQueue.this);
return null;
}
});
}
};
lifetimeObject.addDeleteTask(deleteQueueTask);
addDeleteTask(new DeleteDeleteTask(lifetimeObject, deleteQueueTask));
}
private void addExclusivityConstraint(final Deletable<? extends Deletable> lifetimeObject)
{
final ClearOwnerAction clearOwnerAction = new ClearOwnerAction(lifetimeObject);
final DeleteDeleteTask deleteDeleteTask = new DeleteDeleteTask(lifetimeObject, clearOwnerAction);
clearOwnerAction.setDeleteTask(deleteDeleteTask);
lifetimeObject.addDeleteTask(clearOwnerAction);
addDeleteTask(deleteDeleteTask);
}
// ------ Getters and Setters
public void execute(Runnable runnable)
{
try
{
if (_virtualHost.getState() != State.UNAVAILABLE)
{
_asyncDelivery.execute(runnable);
}
}
catch (RejectedExecutionException ree)
{
// Ignore - SubFlusherRunner or QueueRunner submitted execution as queue was being stopped.
if(!_stopped.get())
{
_logger.error("Unexpected rejected execution", ree);
throw ree;
}
}
}
public boolean isExclusive()
{
return _exclusive != ExclusivityPolicy.NONE;
}
public Exchange<?> getAlternateExchange()
{
return _alternateExchange;
}
public void setAlternateExchange(ExchangeImpl exchange)
{
_alternateExchange = exchange;
}
private void postSetAlternateExchange()
{
if(_alternateExchange instanceof ExchangeImpl)
{
((ExchangeImpl)_alternateExchange).addReference(this);
}
}
private void preSetAlternateExchange()
{
if(_alternateExchange instanceof ExchangeImpl)
{
((ExchangeImpl)_alternateExchange).removeReference(this);
}
}
@Override
public final MessageDurability getMessageDurability()
{
return _messageDurability;
}
@Override
public long getMinimumMessageTtl()
{
return _minimumMessageTtl;
}
@Override
public long getMaximumMessageTtl()
{
return _maximumMessageTtl;
}
@Override
public Collection<String> getAvailableAttributes()
{
return new ArrayList<String>(_arguments.keySet());
}
public String getOwner()
{
if(_exclusiveOwner != null)
{
switch(_exclusive)
{
case CONTAINER:
return (String) _exclusiveOwner;
case PRINCIPAL:
return ((Principal)_exclusiveOwner).getName();
}
}
return null;
}
public VirtualHostImpl getVirtualHost()
{
return _virtualHost;
}
// ------ Manage Consumers
@Override
public synchronized QueueConsumerImpl addConsumer(final ConsumerTarget target,
final FilterManager filters,
final Class<? extends ServerMessage> messageClass,
final String consumerName,
EnumSet<ConsumerImpl.Option> optionSet)
throws ExistingExclusiveConsumer, ExistingConsumerPreventsExclusive,
ConsumerAccessRefused
{
if (hasExclusiveConsumer())
{
throw new ExistingExclusiveConsumer();
}
Object exclusiveOwner = _exclusiveOwner;
switch(_exclusive)
{
case CONNECTION:
if(exclusiveOwner == null)
{
exclusiveOwner = target.getSessionModel().getConnectionModel();
addExclusivityConstraint(target.getSessionModel().getConnectionModel());
}
else
{
if(exclusiveOwner != target.getSessionModel().getConnectionModel())
{
throw new ConsumerAccessRefused();
}
}
break;
case SESSION:
if(exclusiveOwner == null)
{
exclusiveOwner = target.getSessionModel();
addExclusivityConstraint(target.getSessionModel());
}
else
{
if(exclusiveOwner != target.getSessionModel())
{
throw new ConsumerAccessRefused();
}
}
break;
case LINK:
if(getConsumerCount() != 0)
{
throw new ConsumerAccessRefused();
}
break;
case PRINCIPAL:
if(exclusiveOwner == null)
{
exclusiveOwner = target.getSessionModel().getConnectionModel().getAuthorizedPrincipal();
}
else
{
if(!exclusiveOwner.equals(target.getSessionModel().getConnectionModel().getAuthorizedPrincipal()))
{
throw new ConsumerAccessRefused();
}
}
break;
case CONTAINER:
if(exclusiveOwner == null)
{
exclusiveOwner = target.getSessionModel().getConnectionModel().getRemoteContainerName();
}
else
{
if(!exclusiveOwner.equals(target.getSessionModel().getConnectionModel().getRemoteContainerName()))
{
throw new ConsumerAccessRefused();
}
}
break;
case NONE:
break;
default:
throw new ServerScopedRuntimeException("Unknown exclusivity policy " + _exclusive);
}
boolean exclusive = optionSet.contains(ConsumerImpl.Option.EXCLUSIVE);
boolean isTransient = optionSet.contains(ConsumerImpl.Option.TRANSIENT);
if(_noLocal && !optionSet.contains(ConsumerImpl.Option.NO_LOCAL))
{
optionSet = EnumSet.copyOf(optionSet);
optionSet.add(ConsumerImpl.Option.NO_LOCAL);
}
if(exclusive && getConsumerCount() != 0)
{
throw new ExistingConsumerPreventsExclusive();
}
QueueConsumerImpl consumer = new QueueConsumerImpl(this,
target,
consumerName,
filters,
messageClass,
optionSet);
_exclusiveOwner = exclusiveOwner;
target.consumerAdded(consumer);
if (exclusive && !isTransient)
{
_exclusiveSubscriber = consumer;
}
if(consumer.isActive())
{
_activeSubscriberCount.incrementAndGet();
}
consumer.setStateListener(this);
consumer.setQueueContext(new QueueContext(getEntries().getHead()));
if (!isDeleted())
{
synchronized (_consumerListeners)
{
for(ConsumerRegistrationListener<? super MessageSource> listener : _consumerListeners)
{
listener.consumerAdded(this, consumer);
}
}
_consumerList.add(consumer);
if (isDeleted())
{
consumer.queueDeleted();
}
}
else
{
// TODO
}
childAdded(consumer);
consumer.addChangeListener(_deletedChildListener);
deliverAsync(consumer);
return consumer;
}
synchronized void unregisterConsumer(final QueueConsumerImpl consumer)
{
if (consumer == null)
{
throw new NullPointerException("consumer argument is null");
}
boolean removed = _consumerList.remove(consumer);
if (removed)
{
consumer.close();
// No longer can the queue have an exclusive consumer
setExclusiveSubscriber(null);
consumer.setQueueContext(null);
if(_exclusive == ExclusivityPolicy.LINK)
{
_exclusiveOwner = null;
}
if(_messageGroupManager != null)
{
resetSubPointersForGroups(consumer, true);
}
synchronized (_consumerListeners)
{
for(ConsumerRegistrationListener<? super MessageSource> listener : _consumerListeners)
{
listener.consumerRemoved(this, consumer);
}
}
// auto-delete queues must be deleted if there are no remaining subscribers
if(!consumer.isTransient()
&& ( getLifetimePolicy() == LifetimePolicy.DELETE_ON_NO_OUTBOUND_LINKS
|| getLifetimePolicy() == LifetimePolicy.DELETE_ON_NO_LINKS )
&& getConsumerCount() == 0)
{
if (_logger.isInfoEnabled())
{
_logger.info("Auto-deleting queue:" + this);
}
Subject.doAs(SecurityManager.getSubjectWithAddedSystemRights(), new PrivilegedAction<Object>()
{
@Override
public Object run()
{
getVirtualHost().removeQueue(AbstractQueue.this);
return null;
}
});
// we need to manually fire the event to the removed consumer (which was the last one left for this
// queue. This is because the delete method uses the consumer set which has just been cleared
consumer.queueDeleted();
}
}
}
public Collection<QueueConsumer<?>> getConsumers()
{
List<QueueConsumer<?>> consumers = new ArrayList<QueueConsumer<?>>();
QueueConsumerList.ConsumerNodeIterator iter = _consumerList.iterator();
while(iter.advance())
{
consumers.add(iter.getNode().getConsumer());
}
return consumers;
}
public void addConsumerRegistrationListener(final ConsumerRegistrationListener<? super MessageSource> listener)
{
synchronized (_consumerListeners)
{
_consumerListeners.add(listener);
}
}
public void removeConsumerRegistrationListener(final ConsumerRegistrationListener<? super MessageSource> listener)
{
synchronized (_consumerListeners)
{
_consumerListeners.remove(listener);
}
}
public void resetSubPointersForGroups(QueueConsumer<?> consumer, boolean clearAssignments)
{
QueueEntry entry = _messageGroupManager.findEarliestAssignedAvailableEntry(consumer);
if(clearAssignments)
{
_messageGroupManager.clearAssignments(consumer);
}
if(entry != null)
{
QueueConsumerList.ConsumerNodeIterator subscriberIter = _consumerList.iterator();
// iterate over all the subscribers, and if they are in advance of this queue entry then move them backwards
while (subscriberIter.advance())
{
QueueConsumer<?> sub = subscriberIter.getNode().getConsumer();
// we don't make browsers send the same stuff twice
if (sub.seesRequeues())
{
updateSubRequeueEntry(sub, entry);
}
}
deliverAsync();
}
}
public void addBinding(final BindingImpl binding)
{
_bindings.add(binding);
int bindingCount = _bindings.size();
int bindingCountHigh;
while(bindingCount > (bindingCountHigh = _bindingCountHigh.get()))
{
if(_bindingCountHigh.compareAndSet(bindingCountHigh, bindingCount))
{
break;
}
}
childAdded(binding);
}
public void removeBinding(final BindingImpl binding)
{
_bindings.remove(binding);
childRemoved(binding);
}
public Collection<BindingImpl> getBindings()
{
return Collections.unmodifiableList(_bindings);
}
public int getBindingCount()
{
return getBindings().size();
}
public LogSubject getLogSubject()
{
return _logSubject;
}
// ------ Enqueue / Dequeue
public final void enqueue(ServerMessage message, Action<? super MessageInstance> action)
{
incrementQueueCount();
incrementQueueSize(message);
if((_atomicQueueSize.get() + _atomicQueueCount.get()*1024l) > _targetQueueSize.get() && message.getStoredMessage().isInMemory())
{
message.getStoredMessage().flowToDisk();
}
_totalMessagesReceived.incrementAndGet();
if(_recovering.get())
{
EnqueueRequest request = new EnqueueRequest(message, action);
_postRecoveryQueue.add(request);
// deal with the case the recovering status changed just as we added to the post recovery queue
if(!_recovering.get() && _postRecoveryQueue.remove(request))
{
doEnqueue(message, action);
}
}
else
{
doEnqueue(message, action);
}
}
public final void recover(ServerMessage message)
{
incrementQueueCount();
incrementQueueSize(message);
_totalMessagesReceived.incrementAndGet();
doEnqueue(message, null);
}
@Override
public final void completeRecovery()
{
if(_recovering.get())
{
enqueueFromPostRecoveryQueue();
_recovering.set(false);
// deal with any enqueues that occurred just as we cleared the queue
enqueueFromPostRecoveryQueue();
}
}
private void enqueueFromPostRecoveryQueue()
{
while(!_postRecoveryQueue.isEmpty())
{
EnqueueRequest request = _postRecoveryQueue.poll();
MessageReference<?> messageReference = request.getMessage();
doEnqueue(messageReference.getMessage(), request.getAction());
messageReference.release();
}
}
protected void doEnqueue(final ServerMessage message, final Action<? super MessageInstance> action)
{
final QueueConsumer<?> exclusiveSub = _exclusiveSubscriber;
final QueueEntry entry = getEntries().add(message);
updateExpiration(entry);
try
{
if (action != null || (exclusiveSub == null && _queueRunner.isIdle()))
{
Subject.doAs(SecurityManager.getSystemTaskSubject("Immediate Delivery"),
new PrivilegedAction<Void>()
{
@Override
public Void run()
{
tryDeliverStraightThrough(entry);
return null;
}
}
);
}
if (entry.isAvailable())
{
checkConsumersNotAheadOfDelivery(entry);
if (exclusiveSub != null)
{
deliverAsync(exclusiveSub);
}
else
{
deliverAsync();
}
}
checkForNotification(entry.getMessage());
}
finally
{
if(action != null)
{
action.performAction(entry);
}
}
}
private void updateExpiration(final QueueEntry entry)
{
long expiration = entry.getMessage().getExpiration();
long arrivalTime = entry.getMessage().getArrivalTime();
if(_minimumMessageTtl != 0l)
{
if(arrivalTime == 0)
{
arrivalTime = System.currentTimeMillis();
}
if(expiration != 0l)
{
long calculatedExpiration = arrivalTime+_minimumMessageTtl;
if(calculatedExpiration > expiration)
{
entry.setExpiration(calculatedExpiration);
expiration = calculatedExpiration;
}
}
}
if(_maximumMessageTtl != 0l)
{
if(arrivalTime == 0)
{
arrivalTime = System.currentTimeMillis();
}
long calculatedExpiration = arrivalTime+_maximumMessageTtl;
if(expiration == 0l || expiration > calculatedExpiration)
{
entry.setExpiration(calculatedExpiration);
}
}
}
/**
* iterate over consumers and if any is at the end of the queue and can deliver this message,
* then deliver the message
*/
private void tryDeliverStraightThrough(final QueueEntry entry)
{
try
{
QueueConsumerList.ConsumerNode node = _consumerList.getMarkedNode();
QueueConsumerList.ConsumerNode nextNode = node.findNext();
if (nextNode == null)
{
nextNode = _consumerList.getHead().findNext();
}
while (nextNode != null)
{
if (_consumerList.updateMarkedNode(node, nextNode))
{
break;
}
else
{
node = _consumerList.getMarkedNode();
nextNode = node.findNext();
if (nextNode == null)
{
nextNode = _consumerList.getHead().findNext();
}
}
}
// always do one extra loop after we believe we've finished
// this catches the case where we *just* miss an update
int loops = 2;
while (entry.isAvailable() && loops != 0)
{
if (nextNode == null)
{
loops--;
nextNode = _consumerList.getHead();
}
else
{
// if consumer at end, and active, offer
final QueueConsumer<?> sub = nextNode.getConsumer();
deliverToConsumer(sub, entry);
}
nextNode = nextNode.findNext();
}
}
catch (ConnectionScopedRuntimeException | TransportException e)
{
String errorMessage = "Suppressing " + e.getClass().getSimpleName() +
" during straight through delivery, as this" +
" can only indicate an issue with a consumer.";
if(_logger.isDebugEnabled())
{
_logger.debug(errorMessage, e);
}
else
{
_logger.info(errorMessage + ' ' + e.getMessage());
}
}
}
private void deliverToConsumer(final QueueConsumer<?> sub, final QueueEntry entry)
{
if(sub.trySendLock())
{
try
{
if (!sub.isSuspended()
&& consumerReadyAndHasInterest(sub, entry)
&& mightAssign(sub, entry)
&& !sub.wouldSuspend(entry))
{
if (sub.acquires() && !assign(sub, entry))
{
// restore credit here that would have been taken away by wouldSuspend since we didn't manage
// to acquire the entry for this consumer
sub.restoreCredit(entry);
}
else
{
deliverMessage(sub, entry, false);
if(sub.acquires())
{
entry.unlockAcquisition();
}
}
}
}
finally
{
sub.releaseSendLock();
}
}
}
private boolean assign(final QueueConsumer<?> sub, final QueueEntry entry)
{
if(_messageGroupManager == null)
{
//no grouping, try to acquire immediately.
return entry.acquire(sub);
}
else
{
//the group manager is responsible for acquiring the message if/when appropriate
return _messageGroupManager.acceptMessage(sub, entry);
}
}
private boolean mightAssign(final QueueConsumer sub, final QueueEntry entry)
{
if(_messageGroupManager == null || !sub.acquires())
{
return true;
}
QueueConsumer assigned = _messageGroupManager.getAssignedConsumer(entry);
return (assigned == null) || (assigned == sub);
}
protected void checkConsumersNotAheadOfDelivery(final QueueEntry entry)
{
// This method is only required for queues which mess with ordering
// Simple Queues don't :-)
}
private void incrementQueueSize(final ServerMessage message)
{
long size = message.getSize();
getAtomicQueueSize().addAndGet(size);
_enqueueCount.incrementAndGet();
_enqueueSize.addAndGet(size);
if(message.isPersistent() && isDurable())
{
_persistentMessageEnqueueSize.addAndGet(size);
_persistentMessageEnqueueCount.incrementAndGet();
}
}
@Override
public void setTargetSize(final long targetSize)
{
_targetQueueSize.set(targetSize);
}
public long getTotalDequeuedMessages()
{
return _dequeueCount.get();
}
public long getTotalEnqueuedMessages()
{
return _enqueueCount.get();
}
private void incrementQueueCount()
{
getAtomicQueueCount().incrementAndGet();
}
private void deliverMessage(final QueueConsumer<?> sub, final QueueEntry entry, boolean batch)
{
setLastSeenEntry(sub, entry);
_deliveredMessages.incrementAndGet();
incrementUnackedMsgCount(entry);
sub.send(entry, batch);
}
private boolean consumerReadyAndHasInterest(final QueueConsumer<?> sub, final QueueEntry entry)
{
return sub.hasInterest(entry) && (getNextAvailableEntry(sub) == entry);
}
private void setLastSeenEntry(final QueueConsumer<?> sub, final QueueEntry entry)
{
QueueContext subContext = sub.getQueueContext();
if (subContext != null)
{
QueueEntry releasedEntry = subContext.getReleasedEntry();
QueueContext._lastSeenUpdater.set(subContext, entry);
if(releasedEntry == entry)
{
QueueContext._releasedUpdater.compareAndSet(subContext, releasedEntry, null);
}
}
}
private void updateSubRequeueEntry(final QueueConsumer<?> sub, final QueueEntry entry)
{
QueueContext subContext = sub.getQueueContext();
if(subContext != null)
{
QueueEntry oldEntry;
while((oldEntry = subContext.getReleasedEntry()) == null || oldEntry.compareTo(entry) > 0)
{
if(QueueContext._releasedUpdater.compareAndSet(subContext, oldEntry, entry))
{
break;
}
}
}
}
public void requeue(QueueEntry entry)
{
QueueConsumerList.ConsumerNodeIterator subscriberIter = _consumerList.iterator();
// iterate over all the subscribers, and if they are in advance of this queue entry then move them backwards
while (subscriberIter.advance() && entry.isAvailable())
{
QueueConsumer<?> sub = subscriberIter.getNode().getConsumer();
// we don't make browsers send the same stuff twice
if (sub.seesRequeues())
{
updateSubRequeueEntry(sub, entry);
}
}
deliverAsync();
}
@Override
public void dequeue(QueueEntry entry)
{
decrementQueueCount();
decrementQueueSize(entry);
if (entry.acquiredByConsumer())
{
_deliveredMessages.decrementAndGet();
}
checkCapacity();
}
private void decrementQueueSize(final QueueEntry entry)
{
final ServerMessage message = entry.getMessage();
long size = message.getSize();
getAtomicQueueSize().addAndGet(-size);
_dequeueSize.addAndGet(size);
if(message.isPersistent() && isDurable())
{
_persistentMessageDequeueSize.addAndGet(size);
_persistentMessageDequeueCount.incrementAndGet();
}
}
void decrementQueueCount()
{
getAtomicQueueCount().decrementAndGet();
_dequeueCount.incrementAndGet();
}
public boolean resend(final QueueEntry entry, final QueueConsumer<?> consumer)
{
/* TODO : This is wrong as the consumer may be suspended, we should instead change the state of the message
entry to resend and move back the consumer pointer. */
consumer.getSendLock();
try
{
if (!consumer.isClosed())
{
deliverMessage(consumer, entry, false);
return true;
}
else
{
return false;
}
}
finally
{
consumer.releaseSendLock();
}
}
public int getConsumerCount()
{
return _consumerList.size();
}
public int getConsumerCountWithCredit()
{
return _activeSubscriberCount.get();
}
public boolean isUnused()
{
return getConsumerCount() == 0;
}
public boolean isEmpty()
{
return getQueueDepthMessages() == 0;
}
@Override
public int getQueueDepthMessages()
{
return getAtomicQueueCount().get();
}
public long getQueueDepthBytes()
{
return getAtomicQueueSize().get();
}
public int getUndeliveredMessageCount()
{
int count = getQueueDepthMessages() - _deliveredMessages.get();
if (count < 0)
{
return 0;
}
else
{
return count;
}
}
public long getReceivedMessageCount()
{
return _totalMessagesReceived.get();
}
@Override
public long getOldestMessageArrivalTime()
{
long oldestMessageArrivalTime = -1l;
while(oldestMessageArrivalTime == -1l)
{
QueueEntry entry = getEntries().getOldestEntry();
if (entry != null)
{
ServerMessage message = entry.getMessage();
if(message != null)
{
try
{
MessageReference reference = message.newReference();
try
{
oldestMessageArrivalTime = reference.getMessage().getArrivalTime();
}
finally
{
reference.release();
}
}
catch (MessageDeletedException e)
{
// ignore - the oldest message was deleted after it was discovered - we need to find the new oldest message
}
}
}
else
{
oldestMessageArrivalTime = 0;
}
}
return oldestMessageArrivalTime;
}
@Override
public long getOldestMessageAge()
{
long oldestMessageArrivalTime = getOldestMessageArrivalTime();
return oldestMessageArrivalTime == 0 ? 0 : System.currentTimeMillis() - oldestMessageArrivalTime;
}
public boolean isDeleted()
{
return _deleted.get();
}
public List<QueueEntry> getMessagesOnTheQueue()
{
ArrayList<QueueEntry> entryList = new ArrayList<QueueEntry>();
QueueEntryIterator queueListIterator = getEntries().iterator();
while (queueListIterator.advance())
{
QueueEntry node = queueListIterator.getNode();
if (node != null && !node.isDeleted())
{
entryList.add(node);
}
}
return entryList;
}
public void stateChanged(QueueConsumer<?> sub, State oldState, State newState)
{
if (oldState == State.ACTIVE && newState != State.ACTIVE)
{
_activeSubscriberCount.decrementAndGet();
}
else if (newState == State.ACTIVE)
{
if (oldState != State.ACTIVE)
{
_activeSubscriberCount.incrementAndGet();
}
deliverAsync(sub);
}
}
public int compareTo(final AMQQueue o)
{
return getName().compareTo(o.getName());
}
public AtomicInteger getAtomicQueueCount()
{
return _atomicQueueCount;
}
public AtomicLong getAtomicQueueSize()
{
return _atomicQueueSize;
}
private boolean hasExclusiveConsumer()
{
return _exclusiveSubscriber != null;
}
private void setExclusiveSubscriber(QueueConsumer<?> exclusiveSubscriber)
{
_exclusiveSubscriber = exclusiveSubscriber;
}
long getStateChangeCount()
{
return _stateChangeCount.get();
}
/** Used to track bindings to exchanges so that on deletion they can easily be cancelled. */
abstract QueueEntryList getEntries();
protected QueueConsumerList getConsumerList()
{
return _consumerList;
}
public EventLogger getEventLogger()
{
return _virtualHost.getEventLogger();
}
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().getMessageNumber();
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().getMessageNumber() == 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>();
QueueEntryIterator queueListIterator = getEntries().iterator();
while (queueListIterator.advance() && !filter.filterComplete())
{
QueueEntry node = queueListIterator.getNode();
if (!node.isDeleted() && filter.accept(node))
{
entryList.add(node);
}
}
return entryList;
}
public void visit(final QueueEntryVisitor visitor)
{
QueueEntryIterator queueListIterator = getEntries().iterator();
while(queueListIterator.advance())
{
QueueEntry node = queueListIterator.getNode();
if(!node.isDeleted())
{
if(visitor.visit(node))
{
break;
}
}
}
}
/**
* Returns a list of QueEntries from a given range of queue positions, eg messages 5 to 10 on the queue.
*
* The 'queue position' index starts from 1. Using 0 in 'from' will be ignored and continue from 1.
* Using 0 in the 'to' field will return an empty list regardless of the 'from' value.
* @param fromPosition first message position
* @param toPosition last message position
* @return list of messages
*/
public List<QueueEntry> getMessagesRangeOnTheQueue(final long fromPosition, final long toPosition)
{
return getMessagesOnTheQueue(new QueueEntryFilter()
{
private long position = 0;
public boolean accept(QueueEntry entry)
{
position++;
return (position >= fromPosition) && (position <= toPosition);
}
public boolean filterComplete()
{
return position >= toPosition;
}
});
}
// ------ Management functions
public long clearQueue()
{
return clear(0l);
}
private long clear(final long request)
{
//Perform ACLs
getVirtualHost().getSecurityManager().authorisePurge(this);
QueueEntryIterator queueListIterator = getEntries().iterator();
long count = 0;
ServerTransaction txn = new LocalTransaction(getVirtualHost().getMessageStore());
while (queueListIterator.advance())
{
QueueEntry node = queueListIterator.getNode();
if (node.acquire())
{
dequeueEntry(node, txn);
if(++count == request)
{
break;
}
}
}
txn.commit();
return count;
}
private void dequeueEntry(final QueueEntry node)
{
ServerTransaction txn = new AutoCommitTransaction(getVirtualHost().getMessageStore());
dequeueEntry(node, txn);
}
private void dequeueEntry(final QueueEntry node, ServerTransaction txn)
{
txn.dequeue(this, node.getMessage(),
new ServerTransaction.Action()
{
public void postCommit()
{
node.delete();
}
public void onRollback()
{
}
});
}
@Override
public void addDeleteTask(final Action<? super AMQQueue> task)
{
_deleteTaskList.add(task);
}
@Override
public void removeDeleteTask(final Action<? super AMQQueue> task)
{
_deleteTaskList.remove(task);
}
// TODO list all thrown exceptions
public int deleteAndReturnCount()
{
// Check access
_virtualHost.getSecurityManager().authoriseDelete(this);
if (!_deleted.getAndSet(true))
{
final ArrayList<BindingImpl> bindingCopy = new ArrayList<BindingImpl>(_bindings);
for (BindingImpl b : bindingCopy)
{
b.delete();
}
QueueConsumerList.ConsumerNodeIterator consumerNodeIterator = _consumerList.iterator();
while (consumerNodeIterator.advance())
{
QueueConsumer s = consumerNodeIterator.getNode().getConsumer();
if (s != null)
{
s.queueDeleted();
}
}
List<QueueEntry> entries = getMessagesOnTheQueue(new QueueEntryFilter()
{
public boolean accept(QueueEntry entry)
{
return entry.acquire();
}
public boolean filterComplete()
{
return false;
}
});
ServerTransaction txn = new LocalTransaction(getVirtualHost().getMessageStore());
for(final QueueEntry entry : entries)
{
// TODO log requeues with a post enqueue action
int requeues = entry.routeToAlternate(null, txn);
if(requeues == 0)
{
// TODO log discard
}
}
txn.commit();
preSetAlternateExchange();
for (Action<? super AMQQueue> task : _deleteTaskList)
{
task.performAction(this);
}
_deleteTaskList.clear();
close();
deleted();
//Log Queue Deletion
getEventLogger().message(_logSubject, QueueMessages.DELETED());
}
return getQueueDepthMessages();
}
@Override
protected void onClose()
{
super.onClose();
if (!_stopped.getAndSet(true))
{
ReferenceCountingExecutorService.getInstance().releaseExecutorService();
}
}
public void checkCapacity(AMQSessionModel channel)
{
if(_queueFlowControlSizeBytes != 0l)
{
if(_atomicQueueSize.get() > _queueFlowControlSizeBytes)
{
_overfull.set(true);
//Overfull log message
getEventLogger().message(_logSubject, QueueMessages.OVERFULL(_atomicQueueSize.get(),
_queueFlowControlSizeBytes));
_blockedChannels.add(channel);
channel.block(this);
if(_atomicQueueSize.get() <= _queueFlowResumeSizeBytes)
{
//Underfull log message
getEventLogger().message(_logSubject,
QueueMessages.UNDERFULL(_atomicQueueSize.get(), _queueFlowResumeSizeBytes));
channel.unblock(this);
_blockedChannels.remove(channel);
}
}
}
}
private void checkCapacity()
{
if(_queueFlowControlSizeBytes != 0L)
{
if(_overfull.get() && _atomicQueueSize.get() <= _queueFlowResumeSizeBytes)
{
if(_overfull.compareAndSet(true,false))
{//Underfull log message
getEventLogger().message(_logSubject,
QueueMessages.UNDERFULL(_atomicQueueSize.get(), _queueFlowResumeSizeBytes));
}
for(final AMQSessionModel blockedChannel : _blockedChannels)
{
blockedChannel.unblock(this);
_blockedChannels.remove(blockedChannel);
}
}
}
}
private final QueueRunner _queueRunner = new QueueRunner(this);
public void deliverAsync()
{
_stateChangeCount.incrementAndGet();
_queueRunner.execute();
}
public void deliverAsync(QueueConsumer<?> sub)
{
if(_exclusiveSubscriber == null)
{
deliverAsync();
}
else
{
SubFlushRunner flusher = sub.getRunner();
flusher.execute();
}
}
void flushConsumer(QueueConsumer<?> sub)
{
flushConsumer(sub, Long.MAX_VALUE);
}
boolean flushConsumer(QueueConsumer<?> sub, long iterations)
{
boolean atTail = false;
final boolean keepSendLockHeld = iterations <= getMaxAsyncDeliveries();
boolean queueEmpty = false;
try
{
if(keepSendLockHeld)
{
sub.getSendLock();
}
while (!sub.isSuspended() && !atTail && iterations != 0)
{
try
{
if(!keepSendLockHeld)
{
sub.getSendLock();
}
atTail = attemptDelivery(sub, true);
if (atTail && getNextAvailableEntry(sub) == null)
{
queueEmpty = true;
}
else if (!atTail)
{
iterations--;
}
}
finally
{
if(!keepSendLockHeld)
{
sub.releaseSendLock();
}
}
}
}
finally
{
if(keepSendLockHeld)
{
sub.releaseSendLock();
}
if(queueEmpty)
{
sub.queueEmpty();
}
sub.flushBatched();
}
// if there's (potentially) more than one consumer the others will potentially not have been advanced to the
// next entry they are interested in yet. This would lead to holding on to references to expired messages, etc
// which would give us memory "leak".
if (!hasExclusiveConsumer())
{
advanceAllConsumers();
}
return atTail;
}
/**
* Attempt delivery for the given consumer.
*
* Looks up the next node for the consumer and attempts to deliver it.
*
*
* @param sub the consumer
* @param batch true if processing can be batched
* @return true if we have completed all possible deliveries for this sub.
*/
private boolean attemptDelivery(QueueConsumer<?> sub, boolean batch)
{
boolean atTail = false;
boolean subActive = sub.isActive() && !sub.isSuspended();
if (subActive)
{
QueueEntry node = getNextAvailableEntry(sub);
if (_virtualHost.getState() != State.ACTIVE)
{
throw new ConnectionScopedRuntimeException("Delivery halted owing to " +
"virtualhost state " + _virtualHost.getState());
}
if (node != null && node.isAvailable())
{
if (sub.hasInterest(node) && mightAssign(sub, node))
{
if (!sub.wouldSuspend(node))
{
if (sub.acquires() && !assign(sub, node))
{
// restore credit here that would have been taken away by wouldSuspend since we didn't manage
// to acquire the entry for this consumer
sub.restoreCredit(node);
}
else
{
deliverMessage(sub, node, batch);
if(sub.acquires())
{
node.unlockAcquisition();
}
}
}
else // Not enough Credit for message and wouldSuspend
{
//QPID-1187 - Treat the consumer as suspended for this message
// and wait for the message to be removed to continue delivery.
subActive = false;
node.addStateChangeListener(new QueueEntryListener(sub));
}
}
}
atTail = (node == null) || (getEntries().next(node) == null);
}
return atTail || !subActive;
}
protected void advanceAllConsumers()
{
QueueConsumerList.ConsumerNodeIterator consumerNodeIterator = _consumerList.iterator();
while (consumerNodeIterator.advance())
{
QueueConsumerList.ConsumerNode subNode = consumerNodeIterator.getNode();
QueueConsumer sub = subNode.getConsumer();
if(sub.acquires())
{
getNextAvailableEntry(sub);
}
else
{
// TODO
}
}
}
private QueueEntry getNextAvailableEntry(final QueueConsumer sub)
{
QueueContext context = sub.getQueueContext();
if(context != null)
{
QueueEntry lastSeen = context.getLastSeenEntry();
QueueEntry releasedNode = context.getReleasedEntry();
QueueEntry node = (releasedNode != null && lastSeen.compareTo(releasedNode)>=0) ? releasedNode : getEntries()
.next(lastSeen);
boolean expired = false;
while (node != null && (!node.isAvailable() || (expired = node.expired()) || !sub.hasInterest(node) ||
!mightAssign(sub,node)))
{
if (expired)
{
expired = false;
if (node.acquire())
{
dequeueEntry(node);
}
}
if(QueueContext._lastSeenUpdater.compareAndSet(context, lastSeen, node))
{
QueueContext._releasedUpdater.compareAndSet(context, releasedNode, null);
}
lastSeen = context.getLastSeenEntry();
releasedNode = context.getReleasedEntry();
node = (releasedNode != null && lastSeen.compareTo(releasedNode)>=0) ? releasedNode : getEntries().next(
lastSeen);
}
return node;
}
else
{
return null;
}
}
public boolean isEntryAheadOfConsumer(QueueEntry entry, QueueConsumer<?> sub)
{
QueueContext context = sub.getQueueContext();
if(context != null)
{
QueueEntry releasedNode = context.getReleasedEntry();
return releasedNode != null && releasedNode.compareTo(entry) < 0;
}
else
{
return false;
}
}
/**
* Used by queue Runners to asynchronously deliver messages to consumers.
*
* A queue Runner is started whenever a state change occurs, e.g when a new
* message arrives on the queue and cannot be immediately delivered to a
* consumer (i.e. asynchronous delivery is required). Unless there are
* SubFlushRunners operating (due to consumers unsuspending) which are
* capable of accepting/delivering all messages then these messages would
* otherwise remain on the queue.
*
* processQueue should be running while there are messages on the queue AND
* there are consumers that can deliver them. If there are no
* consumers capable of delivering the remaining messages on the queue
* then processQueue should stop to prevent spinning.
*
* Since processQueue is runs in a fixed size Executor, it should not run
* indefinitely to prevent starving other tasks of CPU (e.g jobs to process
* incoming messages may not be able to be scheduled in the thread pool
* because all threads are working on clearing down large queues). To solve
* this problem, after an arbitrary number of message deliveries the
* processQueue job stops iterating, resubmits itself to the executor, and
* ends the current instance
*
* @param runner the Runner to schedule
*/
public long processQueue(QueueRunner runner)
{
long stateChangeCount;
long previousStateChangeCount = Long.MIN_VALUE;
long rVal = Long.MIN_VALUE;
boolean deliveryIncomplete = true;
boolean lastLoop = false;
int iterations = getMaxAsyncDeliveries();
final int numSubs = _consumerList.size();
final int perSub = Math.max(iterations / Math.max(numSubs,1), 1);
// For every message enqueue/requeue the we fire deliveryAsync() which
// increases _stateChangeCount. If _sCC changes whilst we are in our loop
// (detected by setting previousStateChangeCount to stateChangeCount in the loop body)
// then we will continue to run for a maximum of iterations.
// So whilst delivery/rejection is going on a processQueue thread will be running
while (iterations != 0 && ((previousStateChangeCount != (stateChangeCount = _stateChangeCount.get())) || deliveryIncomplete))
{
// we want to have one extra loop after every consumer has reached the point where it cannot move
// further, just in case the advance of one consumer in the last loop allows a different consumer to
// move forward in the next iteration
if (previousStateChangeCount != stateChangeCount)
{
//further asynchronous delivery is required since the
//previous loop. keep going if iteration slicing allows.
lastLoop = false;
rVal = stateChangeCount;
}
previousStateChangeCount = stateChangeCount;
boolean allConsumersDone = true;
boolean consumerDone;
QueueConsumerList.ConsumerNodeIterator consumerNodeIterator = _consumerList.iterator();
//iterate over the subscribers and try to advance their pointer
while (consumerNodeIterator.advance())
{
QueueConsumer<?> sub = consumerNodeIterator.getNode().getConsumer();
sub.getSendLock();
try
{
for(int i = 0 ; i < perSub; i++)
{
//attempt delivery. returns true if no further delivery currently possible to this sub
consumerDone = attemptDelivery(sub, true);
if (consumerDone)
{
sub.flushBatched();
if (lastLoop && !sub.isSuspended())
{
sub.queueEmpty();
}
break;
}
else
{
//this consumer can accept additional deliveries, so we must
//keep going after this (if iteration slicing allows it)
allConsumersDone = false;
lastLoop = false;
if(--iterations == 0)
{
sub.flushBatched();
break;
}
}
}
sub.flushBatched();
}
finally
{
sub.releaseSendLock();
}
}
if(allConsumersDone && lastLoop)
{
//We have done an extra loop already and there are again
//again no further delivery attempts possible, only
//keep going if state change demands it.
deliveryIncomplete = false;
}
else if(allConsumersDone)
{
//All consumers reported being done, but we have to do
//an extra loop if the iterations are not exhausted and
//there is still any work to be done
deliveryIncomplete = _consumerList.size() != 0;
lastLoop = true;
}
else
{
//some consumers can still accept more messages,
//keep going if iteration count allows.
lastLoop = false;
deliveryIncomplete = true;
}
}
// If iterations == 0 then the limiting factor was the time-slicing rather than available messages or credit
// therefore we should schedule this runner again (unless someone beats us to it :-) ).
if (iterations == 0)
{
if (_logger.isDebugEnabled())
{
_logger.debug("Rescheduling runner:" + runner);
}
return 0L;
}
return rVal;
}
public void checkMessageStatus()
{
QueueEntryIterator queueListIterator = getEntries().iterator();
long totalSize = getContextValue(Long.class, QUEUE_ESTIMATED_MESSAGE_MEMORY_OVERHEAD) * getQueueDepthMessages();
long targetSize = _targetQueueSize.get();
while (queueListIterator.advance())
{
QueueEntry node = queueListIterator.getNode();
// Only process nodes that are not currently deleted and not dequeued
if (!node.isDeleted())
{
// If the node has expired then acquire it
if (node.expired())
{
boolean acquiredForDequeueing = node.acquire();
if(!acquiredForDequeueing && node.getDeliveredToConsumer())
{
QueueConsumer consumer = (QueueConsumer) node.getDeliveredConsumer();
acquiredForDequeueing = node.removeAcquisitionFromConsumer(consumer);
if(acquiredForDequeueing)
{
consumer.acquisitionRemoved(node);
}
}
if(acquiredForDequeueing)
{
if (_logger.isDebugEnabled())
{
_logger.debug("Dequeuing expired node " + node);
}
// Then dequeue it.
dequeueEntry(node);
}
}
else
{
// There is a chance that the node could be deleted by
// the time the check actually occurs. So verify we
// can actually get the message to perform the check.
ServerMessage msg = node.getMessage();
if (msg != null)
{
totalSize += msg.getSize();
StoredMessage storedMessage = msg.getStoredMessage();
if(totalSize > targetSize && storedMessage.isInMemory())
{
storedMessage.flowToDisk();
}
checkForNotification(msg);
}
}
}
}
}
@Override
public long getPotentialMemoryFootprint()
{
return Math.max(getContextValue(Long.class,QUEUE_MINIMUM_ESTIMATED_MEMORY_FOOTPRINT),
getQueueDepthBytes() + getContextValue(Long.class, QUEUE_ESTIMATED_MESSAGE_MEMORY_OVERHEAD) * getQueueDepthMessages());
}
public long getAlertRepeatGap()
{
return _alertRepeatGap;
}
public long getAlertThresholdMessageAge()
{
return _alertThresholdMessageAge;
}
public long getAlertThresholdQueueDepthMessages()
{
return _alertThresholdQueueDepthMessages;
}
private void updateAlertChecks()
{
updateNotificationCheck(getAlertThresholdQueueDepthMessages(), NotificationCheck.MESSAGE_COUNT_ALERT);
updateNotificationCheck(getAlertThresholdQueueDepthBytes(), NotificationCheck.QUEUE_DEPTH_ALERT);
updateNotificationCheck(getAlertThresholdMessageAge(), NotificationCheck.MESSAGE_AGE_ALERT);
updateNotificationCheck(getAlertThresholdMessageSize(), NotificationCheck.MESSAGE_SIZE_ALERT);
}
private void updateNotificationCheck(final long checkValue, final NotificationCheck notificationCheck)
{
if (checkValue == 0L)
{
_notificationChecks.remove(notificationCheck);
}
else
{
_notificationChecks.add(notificationCheck);
}
}
public long getAlertThresholdQueueDepthBytes()
{
return _alertThresholdQueueDepthBytes;
}
public long getAlertThresholdMessageSize()
{
return _alertThresholdMessageSize;
}
public long getQueueFlowControlSizeBytes()
{
return _queueFlowControlSizeBytes;
}
public long getQueueFlowResumeSizeBytes()
{
return _queueFlowResumeSizeBytes;
}
public Set<NotificationCheck> getNotificationChecks()
{
return _notificationChecks;
}
private static class DeleteDeleteTask implements Action<Deletable>
{
private final Deletable<? extends Deletable> _lifetimeObject;
private final Action<? super Deletable> _deleteQueueOwnerTask;
public DeleteDeleteTask(final Deletable<? extends Deletable> lifetimeObject,
final Action<? super Deletable> deleteQueueOwnerTask)
{
_lifetimeObject = lifetimeObject;
_deleteQueueOwnerTask = deleteQueueOwnerTask;
}
@Override
public void performAction(final Deletable object)
{
_lifetimeObject.removeDeleteTask(_deleteQueueOwnerTask);
}
}
private final class QueueEntryListener implements StateChangeListener<MessageInstance, QueueEntry.State>
{
private final QueueConsumer<?> _sub;
public QueueEntryListener(final QueueConsumer<?> sub)
{
_sub = sub;
}
public boolean equals(Object o)
{
return o instanceof AbstractQueue.QueueEntryListener
&& _sub == ((QueueEntryListener) o)._sub;
}
public int hashCode()
{
return System.identityHashCode(_sub);
}
public void stateChanged(MessageInstance entry, QueueEntry.State oldSate, QueueEntry.State newState)
{
entry.removeStateChangeListener(this);
deliverAsync(_sub);
}
}
public List<Long> getMessagesOnTheQueue(int num)
{
return getMessagesOnTheQueue(num, 0);
}
public List<Long> getMessagesOnTheQueue(int num, int offset)
{
ArrayList<Long> ids = new ArrayList<Long>(num);
QueueEntryIterator it = getEntries().iterator();
for (int i = 0; i < offset; i++)
{
it.advance();
}
for (int i = 0; i < num && !it.atTail(); i++)
{
it.advance();
ids.add(it.getNode().getMessage().getMessageNumber());
}
return ids;
}
public long getTotalEnqueuedBytes()
{
return _enqueueSize.get();
}
public long getTotalDequeuedBytes()
{
return _dequeueSize.get();
}
public long getPersistentEnqueuedBytes()
{
return _persistentMessageEnqueueSize.get();
}
public long getPersistentDequeuedBytes()
{
return _persistentMessageDequeueSize.get();
}
public long getPersistentEnqueuedMessages()
{
return _persistentMessageEnqueueCount.get();
}
public long getPersistentDequeuedMessages()
{
return _persistentMessageDequeueCount.get();
}
@Override
public String toString()
{
return getName();
}
public long getUnacknowledgedMessages()
{
return _unackedMsgCount.get();
}
public long getUnacknowledgedBytes()
{
return _unackedMsgBytes.get();
}
public void decrementUnackedMsgCount(QueueEntry queueEntry)
{
_unackedMsgCount.decrementAndGet();
_unackedMsgBytes.addAndGet(-queueEntry.getSize());
}
private void incrementUnackedMsgCount(QueueEntry entry)
{
_unackedMsgCount.incrementAndGet();
_unackedMsgBytes.addAndGet(entry.getSize());
}
@Override
public int getMaximumDeliveryAttempts()
{
return _maximumDeliveryAttempts;
}
/**
* Checks if there is any notification to send to the listeners
*/
private void checkForNotification(ServerMessage<?> msg)
{
final Set<NotificationCheck> notificationChecks = getNotificationChecks();
QueueNotificationListener listener = _notificationListener;
if(listener == null)
{
listener = NULL_NOTIFICATION_LISTENER;
}
if(listener != null && !notificationChecks.isEmpty())
{
final long currentTime = System.currentTimeMillis();
final long thresholdTime = currentTime - getAlertRepeatGap();
for (NotificationCheck check : notificationChecks)
{
if (check.isMessageSpecific() || (_lastNotificationTimes[check.ordinal()] < thresholdTime))
{
if (check.notifyIfNecessary(msg, this, listener))
{
_lastNotificationTimes[check.ordinal()] = currentTime;
}
}
}
}
}
public void setNotificationListener(QueueNotificationListener listener)
{
_notificationListener = listener;
}
public final <M extends ServerMessage<? extends StorableMessageMetaData>> int send(final M message,
final String routingAddress,
final InstanceProperties instanceProperties,
final ServerTransaction txn,
final Action<? super MessageInstance> postEnqueueAction)
{
if (_virtualHost.getState() != State.ACTIVE)
{
throw new ConnectionScopedRuntimeException("Virtualhost state " + _virtualHost.getState() + " prevents the message from being sent");
}
if(!message.isReferenced(this))
{
txn.enqueue(this, message, new ServerTransaction.Action()
{
MessageReference _reference = message.newReference();
public void postCommit()
{
try
{
AbstractQueue.this.enqueue(message, postEnqueueAction);
}
finally
{
_reference.release();
}
}
public void onRollback()
{
_reference.release();
}
});
return 1;
}
else
{
return 0;
}
}
@Override
public boolean verifySessionAccess(final AMQSessionModel<?, ?> session)
{
boolean allowed;
switch(_exclusive)
{
case NONE:
allowed = true;
break;
case SESSION:
allowed = _exclusiveOwner == null || _exclusiveOwner == session;
break;
case CONNECTION:
allowed = _exclusiveOwner == null || _exclusiveOwner == session.getConnectionModel();
break;
case PRINCIPAL:
allowed = _exclusiveOwner == null || _exclusiveOwner.equals(session.getConnectionModel().getAuthorizedPrincipal());
break;
case CONTAINER:
allowed = _exclusiveOwner == null || _exclusiveOwner.equals(session.getConnectionModel().getRemoteContainerName());
break;
case LINK:
allowed = _exclusiveSubscriber == null || _exclusiveSubscriber.getSessionModel() == session;
break;
default:
throw new ServerScopedRuntimeException("Unknown exclusivity policy " + _exclusive);
}
return allowed;
}
private synchronized void updateExclusivityPolicy(ExclusivityPolicy desiredPolicy)
throws ExistingConsumerPreventsExclusive
{
if(desiredPolicy == null)
{
desiredPolicy = ExclusivityPolicy.NONE;
}
if(desiredPolicy != _exclusive)
{
switch(desiredPolicy)
{
case NONE:
_exclusiveOwner = null;
break;
case PRINCIPAL:
switchToPrincipalExclusivity();
break;
case CONTAINER:
switchToContainerExclusivity();
break;
case CONNECTION:
switchToConnectionExclusivity();
break;
case SESSION:
switchToSessionExclusivity();
break;
case LINK:
switchToLinkExclusivity();
break;
}
_exclusive = desiredPolicy;
}
}
private void switchToLinkExclusivity() throws ExistingConsumerPreventsExclusive
{
switch (getConsumerCount())
{
case 1:
_exclusiveSubscriber = getConsumerList().getHead().getConsumer();
// deliberate fall through
case 0:
_exclusiveOwner = null;
break;
default:
throw new ExistingConsumerPreventsExclusive();
}
}
private void switchToSessionExclusivity() throws ExistingConsumerPreventsExclusive
{
switch(_exclusive)
{
case NONE:
case PRINCIPAL:
case CONTAINER:
case CONNECTION:
AMQSessionModel session = null;
for(ConsumerImpl c : getConsumers())
{
if(session == null)
{
session = c.getSessionModel();
}
else if(!session.equals(c.getSessionModel()))
{
throw new ExistingConsumerPreventsExclusive();
}
}
_exclusiveOwner = session;
break;
case LINK:
_exclusiveOwner = _exclusiveSubscriber == null ? null : _exclusiveSubscriber.getSessionModel().getConnectionModel();
}
}
private void switchToConnectionExclusivity() throws ExistingConsumerPreventsExclusive
{
switch(_exclusive)
{
case NONE:
case CONTAINER:
case PRINCIPAL:
AMQConnectionModel con = null;
for(ConsumerImpl c : getConsumers())
{
if(con == null)
{
con = c.getSessionModel().getConnectionModel();
}
else if(!con.equals(c.getSessionModel().getConnectionModel()))
{
throw new ExistingConsumerPreventsExclusive();
}
}
_exclusiveOwner = con;
break;
case SESSION:
_exclusiveOwner = _exclusiveOwner == null ? null : ((AMQSessionModel)_exclusiveOwner).getConnectionModel();
break;
case LINK:
_exclusiveOwner = _exclusiveSubscriber == null ? null : _exclusiveSubscriber.getSessionModel().getConnectionModel();
}
}
private void switchToContainerExclusivity() throws ExistingConsumerPreventsExclusive
{
switch(_exclusive)
{
case NONE:
case PRINCIPAL:
String containerID = null;
for(ConsumerImpl c : getConsumers())
{
if(containerID == null)
{
containerID = c.getSessionModel().getConnectionModel().getRemoteContainerName();
}
else if(!containerID.equals(c.getSessionModel().getConnectionModel().getRemoteContainerName()))
{
throw new ExistingConsumerPreventsExclusive();
}
}
_exclusiveOwner = containerID;
break;
case CONNECTION:
_exclusiveOwner = _exclusiveOwner == null ? null : ((AMQConnectionModel)_exclusiveOwner).getRemoteContainerName();
break;
case SESSION:
_exclusiveOwner = _exclusiveOwner == null ? null : ((AMQSessionModel)_exclusiveOwner).getConnectionModel().getRemoteContainerName();
break;
case LINK:
_exclusiveOwner = _exclusiveSubscriber == null ? null : _exclusiveSubscriber.getSessionModel().getConnectionModel().getRemoteContainerName();
}
}
private void switchToPrincipalExclusivity() throws ExistingConsumerPreventsExclusive
{
switch(_exclusive)
{
case NONE:
case CONTAINER:
Principal principal = null;
for(ConsumerImpl c : getConsumers())
{
if(principal == null)
{
principal = c.getSessionModel().getConnectionModel().getAuthorizedPrincipal();
}
else if(!principal.equals(c.getSessionModel().getConnectionModel().getAuthorizedPrincipal()))
{
throw new ExistingConsumerPreventsExclusive();
}
}
_exclusiveOwner = principal;
break;
case CONNECTION:
_exclusiveOwner = _exclusiveOwner == null ? null : ((AMQConnectionModel)_exclusiveOwner).getAuthorizedPrincipal();
break;
case SESSION:
_exclusiveOwner = _exclusiveOwner == null ? null : ((AMQSessionModel)_exclusiveOwner).getConnectionModel().getAuthorizedPrincipal();
break;
case LINK:
_exclusiveOwner = _exclusiveSubscriber == null ? null : _exclusiveSubscriber.getSessionModel().getConnectionModel().getAuthorizedPrincipal();
}
}
private class ClearOwnerAction implements Action<Deletable>
{
private final Deletable<? extends Deletable> _lifetimeObject;
private DeleteDeleteTask _deleteTask;
public ClearOwnerAction(final Deletable<? extends Deletable> lifetimeObject)
{
_lifetimeObject = lifetimeObject;
}
@Override
public void performAction(final Deletable object)
{
if(AbstractQueue.this._exclusiveOwner == _lifetimeObject)
{
AbstractQueue.this._exclusiveOwner = null;
}
if(_deleteTask != null)
{
removeDeleteTask(_deleteTask);
}
}
public void setDeleteTask(final DeleteDeleteTask deleteTask)
{
_deleteTask = deleteTask;
}
}
//=============
@StateTransition(currentState = {State.UNINITIALIZED,State.ERRORED}, desiredState = State.ACTIVE)
private void activate()
{
setState(State.ACTIVE);
}
@StateTransition(currentState = State.UNINITIALIZED, desiredState = State.DELETED)
private void doDeleteBeforeInitialize()
{
preSetAlternateExchange();
setState(State.DELETED);
}
@StateTransition(currentState = State.ACTIVE, desiredState = State.DELETED)
private void doDelete()
{
_virtualHost.removeQueue(this);
preSetAlternateExchange();
setState(State.DELETED);
}
@Override
public ExclusivityPolicy getExclusive()
{
return _exclusive;
}
@Override
public boolean isNoLocal()
{
return _noLocal;
}
@Override
public String getMessageGroupKey()
{
return _messageGroupKey;
}
@Override
public boolean isMessageGroupSharedGroups()
{
return _messageGroupSharedGroups;
}
@Override
public String getMessageGroupDefaultGroup()
{
return _messageGroupDefaultGroup;
}
@Override
public int getMaximumDistinctGroups()
{
return _maximumDistinctGroups;
}
@Override
public boolean isQueueFlowStopped()
{
return _overfull.get();
}
@Override
public <C extends ConfiguredObject> Collection<C> getChildren(final Class<C> clazz)
{
if(clazz == Binding.class)
{
return (Collection<C>) getBindings();
}
else if(clazz == org.apache.qpid.server.model.Consumer.class)
{
return (Collection<C>) getConsumers();
}
else return Collections.emptySet();
}
@Override
protected <C extends ConfiguredObject> C addChild(final Class<C> childClass,
final Map<String, Object> attributes,
final ConfiguredObject... otherParents)
{
if(childClass == Binding.class && otherParents.length == 1 && otherParents[0] instanceof Exchange)
{
final String bindingKey = (String) attributes.get("name");
((ExchangeImpl)otherParents[0]).addBinding(bindingKey, this,
(Map<String,Object>) attributes.get(Binding.ARGUMENTS));
for(Binding binding : _bindings)
{
if(binding.getExchange() == otherParents[0] && binding.getName().equals(bindingKey))
{
return (C) binding;
}
}
return null;
}
return super.addChild(childClass, attributes, otherParents);
}
@Override
public boolean changeAttribute(String name, Object expected, Object desired) throws IllegalStateException, AccessControlException, IllegalArgumentException
{
try
{
if(EXCLUSIVE.equals(name))
{
ExclusivityPolicy existingPolicy = getExclusive();
if(super.changeAttribute(name, expected, desired))
{
try
{
if(existingPolicy != _exclusive)
{
ExclusivityPolicy newPolicy = _exclusive;
_exclusive = existingPolicy;
updateExclusivityPolicy(newPolicy);
}
return true;
}
catch (ExistingConsumerPreventsExclusive existingConsumerPreventsExclusive)
{
throw new IllegalArgumentException("Unable to set exclusivity policy to " + desired + " as an existing combinations of consumers prevents this");
}
}
return false;
}
return super.changeAttribute(name, expected, desired);
}
finally
{
if (isDurable() && getState() != State.DELETED)
{
this.getVirtualHost().getDurableConfigurationStore().update(false, asObjectRecord());
}
}
}
@Override
protected void authoriseSetAttributes(ConfiguredObject<?> modified, Set<String> attributes) throws AccessControlException
{
_virtualHost.getSecurityManager().authoriseUpdate(this);
}
int getMaxAsyncDeliveries()
{
return _maxAsyncDeliveries;
}
private static final String[] NON_NEGATIVE_NUMBERS = {
ALERT_REPEAT_GAP,
ALERT_THRESHOLD_MESSAGE_AGE,
ALERT_THRESHOLD_MESSAGE_SIZE,
ALERT_THRESHOLD_QUEUE_DEPTH_MESSAGES,
ALERT_THRESHOLD_QUEUE_DEPTH_BYTES,
QUEUE_FLOW_CONTROL_SIZE_BYTES,
QUEUE_FLOW_RESUME_SIZE_BYTES,
MAXIMUM_DELIVERY_ATTEMPTS
};
@Override
protected void validateChange(final ConfiguredObject<?> proxyForValidation, final Set<String> changedAttributes)
{
super.validateChange(proxyForValidation, changedAttributes);
Queue<?> queue = (Queue) proxyForValidation;
long queueFlowControlSize = queue.getQueueFlowControlSizeBytes();
long queueFlowControlResumeSize = queue.getQueueFlowResumeSizeBytes();
if (queueFlowControlResumeSize > queueFlowControlSize)
{
throw new IllegalConfigurationException("Flow resume size can't be greater than flow control size");
}
else if (changedAttributes.contains(DURABLE) && proxyForValidation.isDurable() != isDurable())
{
throw new IllegalConfigurationException("Message durability cannot be modified after queue creation");
}
for (String attrName : NON_NEGATIVE_NUMBERS)
{
if (changedAttributes.contains(attrName))
{
Object value = queue.getAttribute(attrName);
if (!(value instanceof Number) || ((Number) value).longValue() < 0)
{
throw new IllegalConfigurationException(
"Only positive integer value can be specified for the attribute "
+ attrName);
}
}
}
}
private class DeletedChildListener implements ConfigurationChangeListener
{
@Override
public void stateChanged(final ConfiguredObject object, final State oldState, final State newState)
{
if(newState == State.DELETED)
{
AbstractQueue.this.childRemoved(object);
}
}
@Override
public void childAdded(final ConfiguredObject object, final ConfiguredObject child)
{
}
@Override
public void childRemoved(final ConfiguredObject object, final ConfiguredObject child)
{
}
@Override
public void attributeSet(final ConfiguredObject object,
final String attributeName,
final Object oldAttributeValue,
final Object newAttributeValue)
{
}
}
private static class EnqueueRequest
{
private final MessageReference<?> _message;
private final Action<? super MessageInstance> _action;
public EnqueueRequest(final ServerMessage message,
final Action<? super MessageInstance> action)
{
_message = message.newReference();
_action = action;
}
public MessageReference<?> getMessage()
{
return _message;
}
public Action<? super MessageInstance> getAction()
{
return _action;
}
}
}