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java - 为什么 SpringBatch MultiResourcePartitioner 不识别 jobParameters?更重要的是,该怎么办?

转载 作者:行者123 更新时间:2023-12-02 22:14:58 24 4
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这是一个非常简单的设置。我有一个可能包含 500 万条记录的文件,我需要读取这些记录并进行一些处理,然后将其发送到数据库。处理和写作的机制并不重要。我需要能够将路径和文件名 [/opt/etc/app/partner/input_file.csv ] 作为参数传递到流程中。这很简单,将其添加到 JobParameters 并将其提供给 JobLauncher。

JobParametersBuilder jpBuilder = new JobParametersBuilder() ;
jpBuilder.addString("filePath", "/opt/etc/app/partner/input_file.csv") ;
jobLauncher.run(job, jpBuilder.toJobParameters() ;

完成,现在让上下文知道它。再次引用 jobParameters 的简单问题。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:batch="http://www.springframework.org/schema/batch"
xsi:schemaLocation="
http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch-2.1.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<description>PoC to demonstrate variable row content handling</description>

<batch:job id="poc" job-repository="jobRepository" incrementer="runIdIncrementer" restartable="true">
<batch:step id="pocReadWriteStep">
<batch:partition step="step" partitioner="partitioner">
<batch:handler task-executor="taskExecutor"/>
</batch:partition>
</batch:step>
</batch:job>

<batch:step id="step">
<batch:tasklet task-executor="taskExecutor" throttle-limit="20" transaction-manager="transactionManager" allow-start-if-complete="true">
<batch:transaction-attributes isolation="READ_UNCOMMITTED"/>
<batch:chunk
reader="reader"
processor="processor"
writer="writer"
commit-interval="20">
</batch:chunk>
</batch:tasklet>
</batch:step>

<bean id="reader" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step">
<property name="resource" value="file:#{jobParameters['filePath']}"/>
<property name="lineMapper">
<bean class="org.springframework.batch.item.file.mapping.PatternMatchingCompositeLineMapper">
<property name="tokenizers">
<map>
<entry key="*" value-ref="lineTokenizer"/>
</map>
</property>
<property name="fieldSetMappers">
<map>
<entry key="*" value-ref="fieldSetMapper"/>
</map>
</property>
</bean>
</property>
</bean>

<bean id="lineTokenizer" class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer"/>

<bean id="fieldSetMapper" class="org.springframework.batch.item.file.mapping.PassThroughFieldSetMapper"/>

<bean id="processor" class="com.verifi.springbatchpoc.PocProcessor"/>

<bean id="writer" class="com.verifi.springbatchpoc.PocWriter"/>

<bean id="runIdIncrementer" class="org.springframework.batch.core.launch.support.RunIdIncrementer"/>

<bean id="partitioner" class="org.springframework.batch.core.partition.support.MultiResourcePartitioner">
<property name="resources" value="file:#{jobParameters['filePath']}"/>
</bean>

<bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
<property name="corePoolSize" value="20"/>
</bean>

</beans>

除了在 MultiResourcePartitioner 中它似乎无法识别对 jobParameters 的引用。我可以对路径和文件名进行硬编码,这很令人高兴,但这并不包含此实现的邮件。

因为我确定有人会问,这里是错误的堆栈跟踪(无论如何都是错误的一部分)。

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1086)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
... 46 more
Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 0): Field or property 'jobParameters' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext'
at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:207)
at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:71)
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:52)
at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:102)
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:97)
at org.springframework.expression.common.CompositeStringExpression.getValue(CompositeStringExpression.java:82)
at org.springframework.expression.common.CompositeStringExpression.getValue(CompositeStringExpression.java:1)
at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:138)
... 52 more

想法、意见、建议?

最佳答案

我认为你应该添加 scope="step"如下:

 <bean id="partitioner" class="org.springframework.batch.core.partition.support.MultiResourcePartitioner"
scope="step">
<property name="resources" value="file:#{jobParameters['filePath']}"/>
</bean>

关于java - 为什么 SpringBatch MultiResourcePartitioner 不识别 jobParameters?更重要的是,该怎么办?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/14628612/

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