spring-batch TimeoutTerminationPolicy 源码
spring-batch TimeoutTerminationPolicy 代码
文件路径：/spring-batch-infrastructure/src/main/java/org/springframework/batch/repeat/policy/TimeoutTerminationPolicy.java
/*
* 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
*
* https://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.springframework.batch.repeat.policy;
import org.springframework.batch.repeat.RepeatContext;
import org.springframework.batch.repeat.context.RepeatContextSupport;
/**
* Termination policy that times out after a fixed period. Allows graceful exit from a
* batch if the latest result comes in after the timeout expires (i.e. does not throw a
* timeout exception).<br>
*
* N.B. It may often be the case that the batch governed by this policy will be
* transactional, and the transaction might have its own timeout. In this case the
* transaction might throw a timeout exception on commit if its timeout threshold is lower
* than the termination policy.
*
* @author Dave Syer
*
*/
public class TimeoutTerminationPolicy extends CompletionPolicySupport {
/**
* Default timeout value in milliseconds (the value equivalent to 30 seconds).
*/
public static final long DEFAULT_TIMEOUT = 30000L;
private long timeout = DEFAULT_TIMEOUT;
/**
* Default constructor.
*/
public TimeoutTerminationPolicy() {
super();
}
/**
* Construct a {@link TimeoutTerminationPolicy} with the specified timeout value (in
* milliseconds).
* @param timeout duration of the timeout.
*/
public TimeoutTerminationPolicy(long timeout) {
super();
this.timeout = timeout;
}
/**
* Check the timeout and complete gracefully if it has expires.
*
* @see org.springframework.batch.repeat.CompletionPolicy#isComplete(org.springframework.batch.repeat.RepeatContext)
*/
@Override
public boolean isComplete(RepeatContext context) {
return ((TimeoutBatchContext) context).isComplete();
}
/**
* Start the clock on the timeout.
*
* @see org.springframework.batch.repeat.CompletionPolicy#start(RepeatContext)
*/
@Override
public RepeatContext start(RepeatContext context) {
return new TimeoutBatchContext(context);
}
protected class TimeoutBatchContext extends RepeatContextSupport {
private volatile long time = System.currentTimeMillis();
private final long timeout = TimeoutTerminationPolicy.this.timeout;
public TimeoutBatchContext(RepeatContext context) {
super(context);
}
public boolean isComplete() {
return (System.currentTimeMillis() - time) > timeout;
}
}
}
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