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Add @EnableRetry support (like @async)
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Dave Syer
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Apr 22, 2014
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116 changes: 116 additions & 0 deletions
116
src/main/java/org/springframework/retry/backoff/UniformRandomBackOffPolicy.java
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| /* | ||
| * Copyright 2006-2007 the original author or authors. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
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| package org.springframework.retry.backoff; | ||
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| import java.util.Random; | ||
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| /** | ||
| * Implementation of {@link BackOffPolicy} that pauses for a random period of | ||
| * time before continuing. A pause is implemented using {@link Sleeper#sleep(long)}. | ||
| * <p/> {@link #setMinBackOffPeriod(long)} is thread-safe and it is safe to call | ||
| * {@link #setBackOffPeriod} during execution from multiple threads, however | ||
| * this may cause a single retry operation to have pauses of different | ||
| * intervals. | ||
| * @author Rob Harrop | ||
| * @author Dave Syer | ||
| */ | ||
| public class UniformRandomBackOffPolicy extends StatelessBackOffPolicy implements SleepingBackOffPolicy<UniformRandomBackOffPolicy> { | ||
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| /** | ||
| * Default min back off period - 500ms. | ||
| */ | ||
| private static final long DEFAULT_BACK_OFF_MIN_PERIOD = 500L; | ||
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| /** | ||
| * Default max back off period - 1500ms. | ||
| */ | ||
| private static final long DEFAULT_BACK_OFF_MAX_PERIOD = 1500L; | ||
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| private volatile long minBackOffPeriod = DEFAULT_BACK_OFF_MIN_PERIOD; | ||
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| private volatile long maxBackOffPeriod = DEFAULT_BACK_OFF_MAX_PERIOD; | ||
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| private Random random = new Random(System.currentTimeMillis()); | ||
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| private Sleeper sleeper = new ObjectWaitSleeper(); | ||
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| public UniformRandomBackOffPolicy withSleeper(Sleeper sleeper) { | ||
| UniformRandomBackOffPolicy res = new UniformRandomBackOffPolicy(); | ||
| res.setMinBackOffPeriod(minBackOffPeriod); | ||
| res.setSleeper(sleeper); | ||
| return res; | ||
| } | ||
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| /** | ||
| * Public setter for the {@link Sleeper} strategy. | ||
| * @param sleeper the sleeper to set defaults to {@link ObjectWaitSleeper}. | ||
| */ | ||
| public void setSleeper(Sleeper sleeper) { | ||
| this.sleeper = sleeper; | ||
| } | ||
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| /** | ||
| * Set the minimum back off period in milliseconds. Cannot be < 1. Default value | ||
| * is 500ms. | ||
| */ | ||
| public void setMinBackOffPeriod(long backOffPeriod) { | ||
| this.minBackOffPeriod = (backOffPeriod > 0 ? backOffPeriod : 1); | ||
| } | ||
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| /** | ||
| * The minimum backoff period in milliseconds. | ||
| * @return the backoff period | ||
| */ | ||
| public long getMinBackOffPeriod() { | ||
| return minBackOffPeriod; | ||
| } | ||
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| /** | ||
| * Set the maximum back off period in milliseconds. Cannot be < 1. Default value | ||
| * is 1500ms. | ||
| */ | ||
| public void setMaxBackOffPeriod(long backOffPeriod) { | ||
| this.maxBackOffPeriod = (backOffPeriod > 0 ? backOffPeriod : 1); | ||
| } | ||
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| /** | ||
| * The maximum backoff period in milliseconds. | ||
| * @return the backoff period | ||
| */ | ||
| public long getMaxBackOffPeriod() { | ||
| return maxBackOffPeriod; | ||
| } | ||
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| /** | ||
| * Pause for the {@link #setMinBackOffPeriod(long)}. | ||
| * @throws BackOffInterruptedException if interrupted during sleep. | ||
| */ | ||
| protected void doBackOff() throws BackOffInterruptedException { | ||
| try { | ||
| long delta = maxBackOffPeriod==minBackOffPeriod ? 0 : random.nextInt((int) (maxBackOffPeriod - minBackOffPeriod)); | ||
| sleeper.sleep(minBackOffPeriod + delta ); | ||
| } | ||
| catch (InterruptedException e) { | ||
| throw new BackOffInterruptedException("Thread interrupted while sleeping", e); | ||
| } | ||
| } | ||
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| public String toString() { | ||
| return "RandomBackOffPolicy[backOffPeriod=" + minBackOffPeriod + ", " + maxBackOffPeriod + "]"; | ||
| } | ||
| } |
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