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ActiveMQ example source code file (QueueBrowserSubscription.java)
The ActiveMQ QueueBrowserSubscription.java source code/** * 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.activemq.broker.region; import java.io.IOException; import javax.jms.InvalidSelectorException; import org.apache.activemq.broker.Broker; import org.apache.activemq.broker.ConnectionContext; import org.apache.activemq.command.ConsumerInfo; import org.apache.activemq.command.MessageAck; import org.apache.activemq.filter.MessageEvaluationContext; import org.apache.activemq.usage.SystemUsage; public class QueueBrowserSubscription extends QueueSubscription { int queueRefs; boolean browseDone; boolean destinationsAdded; public QueueBrowserSubscription(Broker broker,SystemUsage usageManager, ConnectionContext context, ConsumerInfo info) throws InvalidSelectorException { super(broker,usageManager, context, info); } protected boolean canDispatch(MessageReference node) { return !((QueueMessageReference)node).isAcked(); } public synchronized String toString() { return "QueueBrowserSubscription:" + " consumer=" + info.getConsumerId() + ", destinations=" + destinations.size() + ", dispatched=" + dispatched.size() + ", delivered=" + this.prefetchExtension + ", pending=" + getPendingQueueSize(); } synchronized public void destinationsAdded() throws Exception { destinationsAdded = true; checkDone(); } private void checkDone() throws Exception { if( !browseDone && queueRefs == 0 && destinationsAdded) { browseDone=true; add(QueueMessageReference.NULL_MESSAGE); } } public boolean matches(MessageReference node, MessageEvaluationContext context) throws IOException { return !browseDone && super.matches(node, context); } /** * Since we are a browser we don't really remove the message from the queue. */ protected void acknowledge(ConnectionContext context, final MessageAck ack, final MessageReference n) throws IOException { if (info.isNetworkSubscription()) { super.acknowledge(context, ack, n); } } synchronized public void incrementQueueRef() { queueRefs++; } synchronized public void decrementQueueRef() throws Exception { queueRefs--; checkDone(); } } Other ActiveMQ examples (source code examples)Here is a short list of links related to this ActiveMQ QueueBrowserSubscription.java source code file: |
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