标签:java spring scheduled-tasks task
我有一个java应用程序,它使用spring任务调度和批处理作业.我依靠作业中的MultiResourceItemReader从目录中读取一些文件,处理它们并删除这些文件.外部进程负责定期在该目录中放置新文件.但问题是,每次作业运行时,它都会尝试读取启动应用程序时出现的相同文件资源,因此会失败,因为这些资源已经消失,现在有新文件存在.
问题是,如何配置应用程序,以便为给定作业的每个计划执行评估资源属性.
相关的bean粘贴在下面:
<bean id="multiResourceReader" class="org.springframework.batch.item.file.MultiResourceItemReader">
<property name="resources" value="file:/opt/data/*.csv" />
<property name="delegate" ref="testFlatFileItemReader" />
</bean>
<batch:job id="MyJob">
<batch:step id="readandstore">
<batch:tasklet>
<batch:chunk reader="multiResourceReader" writer="oracleItemWriter" commit-interval="10" />
</batch:tasklet>
</batch:step>
</batch:job>
<bean id="runScheduler" class="com.myapp.Scheduler">
<property name="jobLauncher" ref="jobLauncher" />
<property name="job" ref="MyJob" />
</bean>
<task:scheduled-tasks>
<task:scheduled ref="runScheduler" method="run" cron="*/30 * * * * *" />
</task:scheduled-tasks>
解决方法:
我设法解决了我自己发布的问题,因为它已经收到了近一周的回复.
我删除了multiResourceReader的resources属性,并在< batch:tasklet>下的侦听器中添加了一个StepListener.它实现了StepExecutionListener.此侦听器有两个方法,一个在步执行之前调用,另一个在步执行之后调用. StepListener接受一个名为filePattern的属性,该属性的值类似于之前为multiResourceReader的resources属性提供的值.以下是更新的bean的外观:
<batch:job id="MyJob">
<batch:step id="readandstore">
<batch:tasklet>
<batch:chunk reader="multiResourceReader" writer="oracleItemWriter" commit-interval="10" />
<batch:listeners>
<batch:listener ref="StepListener" />
</batch:listeners>
</batch:tasklet>
</batch:step>
</batch:job>
<bean id="multiResourceReader" class="org.springframework.batch.item.file.MultiResourceItemReader">
<property name="delegate" ref="csvFileItemReader" />
</bean>
<bean id="StepListener" class="com.myapp.StepListener">
<property name="filePattern" value="file:/opt/data/*.csv" />
</bean>
以下是com.myapp.StepListener的外观:
package com.myapp;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.springframework.batch.core.BatchStatus;
import org.springframework.batch.core.ExitStatus;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.StepExecutionListener;
import org.apache.commons.io.FileUtils;
import org.springframework.batch.item.file.MultiResourceItemReader;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.core.io.Resource;
public class StepListener implements StepExecutionListener, ApplicationContextAware {
private static final Logger logger = Logger.getLogger(StepListener.class.getName());
private Resource[] resources;
private ApplicationContext applicationContext;
private String filePattern;
@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
public void setFilePattern(String filePattern) {
this.filePattern = filePattern;
}
@Override
public void beforeStep(StepExecution stepExecution) {
MultiResourceItemReader reader = (MultiResourceItemReader) applicationContext.getBean("multiResourceReader");
try {
resources = applicationContext.getResources(filePattern);
reader.setResources(resources);
} catch (IOException ex) {
logger.log(Level.SEVERE, "Unable to set file resources to bean multiResourceItemReader", ex);
}
}
@Override
public ExitStatus afterStep(StepExecution stepExecution) {
if (stepExecution.getExitStatus().equals(ExitStatus.COMPLETED)
&& stepExecution.getStatus().equals(BatchStatus.COMPLETED)
&& resources.length > 0) {
for (Resource resource : resources) {
try {
File oldFile = new File(resource.getFile().getAbsolutePath());
File newFile = new File(resource.getFile().getAbsolutePath() + ".processed");
FileUtils.copyFile(oldFile, newFile);
oldFile.delete();
} catch (IOException ex) {
logger.log(Level.SEVERE, "Encountered problem when trying to remove the processed file(s)", ex);
}
}
}
return stepExecution.getExitStatus();
}
}
标签:java,spring,scheduled-tasks,task 来源: https://codeday.me/bug/20190528/1174902.html
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