spring-batch JobLaunchingGateway 源码
spring-batch JobLaunchingGateway 代码
文件路径：/spring-batch-integration/src/main/java/org/springframework/batch/integration/launch/JobLaunchingGateway.java
/*
* Copyright 2002-2013 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.integration.launch;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.JobExecutionException;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.integration.handler.AbstractReplyProducingMessageHandler;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHandlingException;
import org.springframework.util.Assert;
/**
* The {@link JobLaunchingGateway} is used to launch Batch Jobs. Internally it delegates
* to a {@link JobLaunchingMessageHandler}.
*
* @author Gunnar Hillert
* @since 1.3
*/
public class JobLaunchingGateway extends AbstractReplyProducingMessageHandler {
private final JobLaunchingMessageHandler jobLaunchingMessageHandler;
/**
* Constructor taking a {@link JobLauncher} as parameter.
* @param jobLauncher Must not be null.
*
*/
public JobLaunchingGateway(JobLauncher jobLauncher) {
Assert.notNull(jobLauncher, "jobLauncher must not be null.");
this.jobLaunchingMessageHandler = new JobLaunchingMessageHandler(jobLauncher);
}
/**
* Launches a Batch Job using the provided request {@link Message}. The payload of the
* {@link Message} <em>must</em> be an instance of {@link JobLaunchRequest}.
* @param requestMessage must not be null.
* @return Generally a {@link JobExecution} will always be returned. An exception
* ({@link MessageHandlingException}) will only be thrown if there is a failure to
* start the job. The cause of the exception will be a {@link JobExecutionException}.
* @throws MessageHandlingException when a job cannot be launched
*/
@Override
protected Object handleRequestMessage(Message<?> requestMessage) {
Assert.notNull(requestMessage, "The provided requestMessage must not be null.");
final Object payload = requestMessage.getPayload();
Assert.isInstanceOf(JobLaunchRequest.class, payload, "The payload must be of type JobLaunchRequest.");
final JobLaunchRequest jobLaunchRequest = (JobLaunchRequest) payload;
final JobExecution jobExecution;
try {
jobExecution = this.jobLaunchingMessageHandler.launch(jobLaunchRequest);
}
catch (JobExecutionException e) {
throw new MessageHandlingException(requestMessage, e);
}
return jobExecution;
}
}
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spring-batch JobLaunchRequest 源码
spring-batch JobLaunchRequestHandler 源码
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