spring-batch StagingItemListener 源码
spring-batch StagingItemListener 代码
文件路径：/spring-batch-samples/src/main/java/org/springframework/batch/sample/common/StagingItemListener.java
/*
* Copyright 2006-2012 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.sample.common;
import javax.sql.DataSource;
import org.springframework.batch.core.listener.StepListenerSupport;
import org.springframework.batch.item.ItemReader;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.dao.OptimisticLockingFailureException;
import org.springframework.jdbc.core.JdbcOperations;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.util.Assert;
/**
* Thread-safe database {@link ItemReader} implementing the process indicator pattern.
*/
public class StagingItemListener extends StepListenerSupport<Long, Long> implements InitializingBean {
private JdbcOperations jdbcTemplate;
public void setDataSource(DataSource dataSource) {
jdbcTemplate = new JdbcTemplate(dataSource);
}
@Override
public final void afterPropertiesSet() throws Exception {
Assert.notNull(jdbcTemplate, "You must provide a DataSource.");
}
@Override
public void afterRead(Long id) {
int count = jdbcTemplate.update("UPDATE BATCH_STAGING SET PROCESSED=? WHERE ID=? AND PROCESSED=?",
StagingItemWriter.DONE, id, StagingItemWriter.NEW);
if (count != 1) {
throw new OptimisticLockingFailureException("The staging record with ID=" + id
+ " was updated concurrently when trying to mark as complete (updated " + count + " records.");
}
}
}
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