1 files changed, 480 insertions, 0 deletions
diff --git a/qpid/java/broker-core/src/main/java/org/apache/qpid/server/queue/QueueConsumer.java b/qpid/java/broker-core/src/main/java/org/apache/qpid/server/queue/QueueConsumer.java
new file mode 100644
index 0000000000..ff7840255a
--- /dev/null
+++ b/qpid/java/broker-core/src/main/java/org/apache/qpid/server/queue/QueueConsumer.java
@@ -0,0 +1,480 @@
+/*
+ *
+ * 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 org.apache.log4j.Logger;
+import org.apache.qpid.AMQException;
+import org.apache.qpid.server.filter.FilterManager;
+import org.apache.qpid.server.logging.LogActor;
+import org.apache.qpid.server.logging.LogSubject;
+import org.apache.qpid.server.logging.actors.CurrentActor;
+import org.apache.qpid.server.logging.actors.GenericActor;
+import org.apache.qpid.server.logging.messages.SubscriptionMessages;
+import org.apache.qpid.server.logging.subjects.QueueLogSubject;
+import org.apache.qpid.server.message.MessageInstance;
+import org.apache.qpid.server.message.ServerMessage;
+import org.apache.qpid.server.protocol.AMQSessionModel;
+import org.apache.qpid.server.protocol.MessageConverterRegistry;
+import org.apache.qpid.server.consumer.Consumer;
+import org.apache.qpid.server.consumer.ConsumerTarget;
+import org.apache.qpid.server.util.StateChangeListener;
+
+import java.text.MessageFormat;
+import java.util.EnumMap;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+import static org.apache.qpid.server.logging.subjects.LogSubjectFormat.SUBSCRIPTION_FORMAT;
+
+class QueueConsumer<T extends ConsumerTarget> implements Consumer
+{
+
+    public static enum State
+    {
+        ACTIVE,
+        SUSPENDED,
+        CLOSED
+    }
+
+    private static final Logger _logger = Logger.getLogger(QueueConsumer.class);
+    private final AtomicBoolean _targetClosed = new AtomicBoolean(false);
+    private final AtomicBoolean _closed = new AtomicBoolean(false);
+    private final long _id;
+    private final AtomicReference<State> _state = new AtomicReference<State>(State.ACTIVE);
+    private final Lock _stateChangeLock = new ReentrantLock();
+    private final long _createTime = System.currentTimeMillis();
+    private final MessageInstance.ConsumerAcquiredState _owningState = new MessageInstance.ConsumerAcquiredState(this);
+    private final boolean _acquires;
+    private final boolean _seesRequeues;
+    private final String _consumerName;
+    private final boolean _isTransient;
+    private final AtomicLong _deliveredCount = new AtomicLong(0);
+    private final AtomicLong _deliveredBytes = new AtomicLong(0);
+    private final FilterManager _filters;
+    private final Class<? extends ServerMessage> _messageClass;
+    private final Object _sessionReference;
+    private SimpleAMQQueue _queue;
+    private GenericActor _logActor;
+
+    static final EnumMap<ConsumerTarget.State, State> STATE_MAP =
+            new EnumMap<ConsumerTarget.State, State>(ConsumerTarget.State.class);
+
+    static
+    {
+        STATE_MAP.put(ConsumerTarget.State.ACTIVE, State.ACTIVE);
+        STATE_MAP.put(ConsumerTarget.State.SUSPENDED, State.SUSPENDED);
+        STATE_MAP.put(ConsumerTarget.State.CLOSED, State.CLOSED);
+    }
+
+    private final T _target;
+    private final SubFlushRunner _runner = new SubFlushRunner(this);
+    private volatile QueueContext _queueContext;
+    private StateChangeListener<? extends Consumer, State> _stateListener = new StateChangeListener<Consumer, State>()
+    {
+        public void stateChanged(Consumer sub, State oldState, State newState)
+        {
+            CurrentActor.get().message(SubscriptionMessages.STATE(newState.toString()));
+        }
+    };
+    private boolean _noLocal;
+
+    QueueConsumer(final FilterManager filters,
+                  final Class<? extends ServerMessage> messageClass,
+                  final boolean acquires,
+                  final boolean seesRequeues,
+                  final String consumerName,
+                  final boolean isTransient,
+                  T target)
+    {
+        _messageClass = messageClass;
+        _sessionReference = target.getSessionModel().getConnectionReference();
+        _id = SUB_ID_GENERATOR.getAndIncrement();
+        _filters = filters;
+        _acquires = acquires;
+        _seesRequeues = seesRequeues;
+        _consumerName = consumerName;
+        _isTransient = isTransient;
+        _target = target;
+        _target.setStateListener(
+                new StateChangeListener<ConsumerTarget, ConsumerTarget.State>()
+                    {
+                        @Override
+                        public void stateChanged(final ConsumerTarget object,
+                                                 final ConsumerTarget.State oldState,
+                                                 final ConsumerTarget.State newState)
+                        {
+                            targetStateChanged(oldState, newState);
+                        }
+                    });
+    }
+
+    private void targetStateChanged(final ConsumerTarget.State oldState, final ConsumerTarget.State newState)
+    {
+        if(oldState != newState)
+        {
+            if(newState == ConsumerTarget.State.CLOSED)
+            {
+                if(_targetClosed.compareAndSet(false,true))
+                {
+                    CurrentActor.get().message(getLogSubject(), SubscriptionMessages.CLOSE());
+                }
+            }
+            else
+            {
+                CurrentActor.get().message(getLogSubject(),SubscriptionMessages.STATE(newState.toString()));
+            }
+        }
+
+        if(newState == ConsumerTarget.State.CLOSED && oldState != newState && !_closed.get())
+        {
+            try
+            {
+                close();
+            }
+            catch (AMQException e)
+            {
+                _logger.error("Unable to remove to remove consumer", e);
+                throw new RuntimeException(e);
+            }
+        }
+        final StateChangeListener<Consumer, State> stateListener =
+                (StateChangeListener<Consumer, State>) getStateListener();
+        if(stateListener != null)
+        {
+            stateListener.stateChanged(this, STATE_MAP.get(oldState), STATE_MAP.get(newState));
+        }
+    }
+
+    public T getTarget()
+    {
+        return _target;
+    }
+
+    @Override
+    public void externalStateChange()
+    {
+        getQueue().deliverAsync(this);
+    }
+
+    @Override
+    public long getUnacknowledgedBytes()
+    {
+        return _target.getUnacknowledgedBytes();
+    }
+
+    @Override
+    public long getUnacknowledgedMessages()
+    {
+        return _target.getUnacknowledgedMessages();
+    }
+
+    @Override
+    public AMQSessionModel getSessionModel()
+    {
+        return _target.getSessionModel();
+    }
+
+    @Override
+    public boolean isSuspended()
+    {
+        return _target.isSuspended();
+    }
+
+    @Override
+    public void close() throws AMQException
+    {
+        if(_closed.compareAndSet(false,true))
+        {
+            getSendLock();
+            try
+            {
+                _target.close();
+                _target.consumerRemoved(this);
+                _queue.unregisterConsumer(this);
+            }
+            finally
+            {
+                releaseSendLock();
+            }
+
+        }
+    }
+
+    void flushBatched()
+    {
+        _target.flushBatched();
+    }
+
+    void queueDeleted()
+    {
+        _target.queueDeleted();
+    }
+
+    boolean wouldSuspend(final MessageInstance msg)
+    {
+        return !_target.allocateCredit(msg.getMessage());
+    }
+
+    void restoreCredit(final MessageInstance queueEntry)
+    {
+        _target.restoreCredit(queueEntry.getMessage());
+    }
+
+    void queueEmpty() throws AMQException
+    {
+        _target.queueEmpty();
+    }
+
+    State getState()
+    {
+        return STATE_MAP.get(_target.getState());
+    }
+
+    public final SimpleAMQQueue getQueue()
+    {
+        return _queue;
+    }
+
+    final void setQueue(SimpleAMQQueue queue, boolean exclusive)
+    {
+        if(getQueue() != null)
+        {
+            throw new IllegalStateException("Attempt to set queue for consumer " + this + " to " + queue + "when already set to " + getQueue());
+        }
+        _queue = queue;
+
+        String queueString = new QueueLogSubject(_queue).toLogString();
+
+        _logActor = new GenericActor("[" + MessageFormat.format(SUBSCRIPTION_FORMAT, getId())
+                             + "("
+                             // queueString is [vh(/{0})/qu({1}) ] so need to trim
+                             //                ^                ^^
+                             + queueString.substring(1,queueString.length() - 3)
+                             + ")"
+                             + "] ");
+
+
+        if (CurrentActor.get().getRootMessageLogger().isMessageEnabled(_logActor, _logActor.getLogSubject(), SubscriptionMessages.CREATE_LOG_HIERARCHY))
+        {
+            final String filterLogString = getFilterLogString();
+            CurrentActor.get().message(_logActor.getLogSubject(), SubscriptionMessages.CREATE(filterLogString, queue.isDurable() && exclusive,
+                                                                                filterLogString.length() > 0));
+        }
+    }
+
+    protected final LogSubject getLogSubject()
+    {
+        return _logActor.getLogSubject();
+    }
+
+    final LogActor getLogActor()
+    {
+        return _logActor;
+    }
+
+
+    @Override
+    public final void flush() throws AMQException
+    {
+        getQueue().flushConsumer(this);
+    }
+
+    boolean resend(final MessageInstance entry) throws AMQException
+    {
+        return getQueue().resend((QueueEntry)entry, this);
+    }
+
+    final SubFlushRunner getRunner()
+    {
+        return _runner;
+    }
+
+    public final long getId()
+    {
+        return _id;
+    }
+
+    public final StateChangeListener<? extends Consumer, State> getStateListener()
+    {
+        return _stateListener;
+    }
+
+    public final void setStateListener(StateChangeListener<? extends Consumer, State> listener)
+    {
+        _stateListener = listener;
+    }
+
+    final QueueContext getQueueContext()
+    {
+        return _queueContext;
+    }
+
+    final void setQueueContext(QueueContext queueContext)
+    {
+        _queueContext = queueContext;
+    }
+
+    protected boolean updateState(State from, State to)
+    {
+        return _state.compareAndSet(from, to);
+    }
+
+    public final boolean isActive()
+    {
+        return getState() == State.ACTIVE;
+    }
+
+    public final boolean isClosed()
+    {
+        return getState() == State.CLOSED;
+    }
+
+    public final void setNoLocal(boolean noLocal)
+    {
+        _noLocal = noLocal;
+    }
+
+    public final boolean hasInterest(MessageInstance entry)
+    {
+       //check that the message hasn't been rejected
+        if (entry.isRejectedBy(this))
+        {
+
+            return false;
+        }
+
+        if (entry.getMessage().getClass() == _messageClass)
+        {
+            if(_noLocal)
+            {
+                Object connectionRef = entry.getMessage().getConnectionReference();
+                if (connectionRef != null && connectionRef == _sessionReference)
+                {
+                    return false;
+                }
+            }
+        }
+        else
+        {
+            // no interest in messages we can't convert
+            if(_messageClass != null && MessageConverterRegistry.getConverter(entry.getMessage().getClass(),
+                                                                              _messageClass)==null)
+            {
+                return false;
+            }
+        }
+        return (_filters == null) || _filters.allAllow(entry.asFilterable());
+    }
+
+    protected String getFilterLogString()
+    {
+        StringBuilder filterLogString = new StringBuilder();
+        String delimiter = ", ";
+        boolean hasEntries = false;
+        if (_filters != null && _filters.hasFilters())
+        {
+            filterLogString.append(_filters.toString());
+            hasEntries = true;
+        }
+
+        if (!acquires())
+        {
+            if (hasEntries)
+            {
+                filterLogString.append(delimiter);
+            }
+            filterLogString.append("Browser");
+            hasEntries = true;
+        }
+
+        return filterLogString.toString();
+    }
+
+    public final boolean trySendLock()
+    {
+        return _stateChangeLock.tryLock();
+    }
+
+    public final void getSendLock()
+    {
+        _stateChangeLock.lock();
+    }
+
+    public final void releaseSendLock()
+    {
+        _stateChangeLock.unlock();
+    }
+
+    public final long getCreateTime()
+    {
+        return _createTime;
+    }
+
+    final MessageInstance.ConsumerAcquiredState getOwningState()
+    {
+        return _owningState;
+    }
+
+    public final boolean acquires()
+    {
+        return _acquires;
+    }
+
+    public final boolean seesRequeues()
+    {
+        return _seesRequeues;
+    }
+
+    public final String getName()
+    {
+        return _consumerName;
+    }
+
+    public final boolean isTransient()
+    {
+        return _isTransient;
+    }
+
+    public final long getBytesOut()
+    {
+        return _deliveredBytes.longValue();
+    }
+
+    public final long getMessagesOut()
+    {
+        return _deliveredCount.longValue();
+    }
+
+    final void send(final QueueEntry entry, final boolean batch) throws AMQException
+    {
+        _deliveredCount.incrementAndGet();
+        ServerMessage message = entry.getMessage();
+        if(message == null)
+        {
+            throw new AMQException("message was null!");
+        }
+        _deliveredBytes.addAndGet(message.getSize());
+        _target.send(entry, batch);
+    }
+}