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ActiveMQ example source code file (RedeliveryPolicy.java)
The ActiveMQ RedeliveryPolicy.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; import java.io.Serializable; import java.util.Random; /** * Configuration options used to control how messages are re-delivered when they * are rolled back. * * @org.apache.xbean.XBean element="redeliveryPolicy" * */ public class RedeliveryPolicy implements Cloneable, Serializable { public static final int NO_MAXIMUM_REDELIVERIES = -1; private static Random randomNumberGenerator; // +/-15% for a 30% spread -cgs private double collisionAvoidanceFactor = 0.15d; private int maximumRedeliveries = 6; private long maximumRedeliveryDelay = -1; private long initialRedeliveryDelay = 1000L; private boolean useCollisionAvoidance; private boolean useExponentialBackOff; private double backOffMultiplier = 5.0; private long redeliveryDelay = initialRedeliveryDelay; public RedeliveryPolicy() { } public RedeliveryPolicy copy() { try { return (RedeliveryPolicy)clone(); } catch (CloneNotSupportedException e) { throw new RuntimeException("Could not clone: " + e, e); } } public double getBackOffMultiplier() { return backOffMultiplier; } public void setBackOffMultiplier(double backOffMultiplier) { this.backOffMultiplier = backOffMultiplier; } public short getCollisionAvoidancePercent() { return (short)Math.round(collisionAvoidanceFactor * 100); } public void setCollisionAvoidancePercent(short collisionAvoidancePercent) { this.collisionAvoidanceFactor = collisionAvoidancePercent * 0.01d; } public long getInitialRedeliveryDelay() { return initialRedeliveryDelay; } public void setInitialRedeliveryDelay(long initialRedeliveryDelay) { this.initialRedeliveryDelay = initialRedeliveryDelay; } public long getMaximumRedeliveryDelay() { return maximumRedeliveryDelay; } public void setMaximumRedeliveryDelay(long maximumRedeliveryDelay) { this.maximumRedeliveryDelay = maximumRedeliveryDelay; } public int getMaximumRedeliveries() { return maximumRedeliveries; } public void setMaximumRedeliveries(int maximumRedeliveries) { this.maximumRedeliveries = maximumRedeliveries; } public long getNextRedeliveryDelay(long previousDelay) { long nextDelay; if (previousDelay == 0) { nextDelay = redeliveryDelay; } else if (useExponentialBackOff && backOffMultiplier > 1) { nextDelay = (long) (previousDelay * backOffMultiplier); if(maximumRedeliveryDelay != -1 && nextDelay > maximumRedeliveryDelay) { // in case the user made max redelivery delay less than redelivery delay for some reason. nextDelay = Math.max(maximumRedeliveryDelay, redeliveryDelay); } } else { nextDelay = previousDelay; } if (useCollisionAvoidance) { /* * First random determines +/-, second random determines how far to * go in that direction. -cgs */ Random random = getRandomNumberGenerator(); double variance = (random.nextBoolean() ? collisionAvoidanceFactor : -collisionAvoidanceFactor) * random.nextDouble(); nextDelay += nextDelay * variance; } return nextDelay; } public boolean isUseCollisionAvoidance() { return useCollisionAvoidance; } public void setUseCollisionAvoidance(boolean useCollisionAvoidance) { this.useCollisionAvoidance = useCollisionAvoidance; } public boolean isUseExponentialBackOff() { return useExponentialBackOff; } public void setUseExponentialBackOff(boolean useExponentialBackOff) { this.useExponentialBackOff = useExponentialBackOff; } protected static synchronized Random getRandomNumberGenerator() { if (randomNumberGenerator == null) { randomNumberGenerator = new Random(); } return randomNumberGenerator; } public void setRedeliveryDelay(long redeliveryDelay) { this.redeliveryDelay = redeliveryDelay; } public long getRedeliveryDelay() { return redeliveryDelay; } } Other ActiveMQ examples (source code examples)Here is a short list of links related to this ActiveMQ RedeliveryPolicy.java source code file: |
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