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ActiveMQ example source code file (FixedCountSubscriptionRecoveryPolicy.java)
The ActiveMQ FixedCountSubscriptionRecoveryPolicy.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.policy; import java.util.ArrayList; import java.util.List; import org.apache.activemq.broker.Broker; import org.apache.activemq.broker.ConnectionContext; import org.apache.activemq.broker.region.MessageReference; import org.apache.activemq.broker.region.SubscriptionRecovery; import org.apache.activemq.broker.region.Topic; import org.apache.activemq.command.ActiveMQDestination; import org.apache.activemq.command.Message; import org.apache.activemq.filter.DestinationFilter; /** * This implementation of {@link SubscriptionRecoveryPolicy} will keep a fixed * count of last messages. * * @org.apache.xbean.XBean * */ public class FixedCountSubscriptionRecoveryPolicy implements SubscriptionRecoveryPolicy { private volatile MessageReference messages[]; private int maximumSize = 100; private int tail; public SubscriptionRecoveryPolicy copy() { FixedCountSubscriptionRecoveryPolicy rc = new FixedCountSubscriptionRecoveryPolicy(); rc.setMaximumSize(maximumSize); return rc; } public synchronized boolean add(ConnectionContext context, MessageReference node) throws Exception { messages[tail++] = node; if (tail >= messages.length) { tail = 0; } return true; } public synchronized void recover(ConnectionContext context, Topic topic, SubscriptionRecovery sub) throws Exception { // Re-dispatch the last message seen. int t = tail; // The buffer may not have rolled over yet..., start from the front if (messages[t] == null) { t = 0; } // Well the buffer is really empty then. if (messages[t] == null) { return; } // Keep dispatching until t hit's tail again. do { MessageReference node = messages[t]; sub.addRecoveredMessage(context, node); t++; if (t >= messages.length) { t = 0; } } while (t != tail); } public void start() throws Exception { messages = new MessageReference[maximumSize]; } public void stop() throws Exception { messages = null; } public int getMaximumSize() { return maximumSize; } /** * Sets the maximum number of messages that this destination will hold * around in RAM */ public void setMaximumSize(int maximumSize) { this.maximumSize = maximumSize; } public synchronized Message[] browse(ActiveMQDestination destination) throws Exception { List<Message> result = new ArrayList Other ActiveMQ examples (source code examples)Here is a short list of links related to this ActiveMQ FixedCountSubscriptionRecoveryPolicy.java source code file: |
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