[英]“Step” or “Job” Scope for Spring-Batch beans?
I'm using Spring-Batch v3.0.0 for batch imports. 我正在使用Spring-Batch v3.0.0进行批量导入。 There is a StepScope
and a JobScope
. 有一个StepScope
和一个JobScope
。 How can I know which of them is appropriate? 我怎么知道哪一个合适?
For example, if I define a custom ItemReader
or ItemWriter
that should use a specific EntityManager
, it could look like this: 例如,如果我定义应该使用特定EntityManager
的自定义ItemReader
或ItemWriter
,它可能如下所示:
@Bean
@Scope("step") //@Scope("job") //custom scope required to inject #jobParameters
public JpaItemWriter<T> jpaItemWriter(EntityManagerFactory emf) {
JpaItemWriter<T> writer = new JpaItemWriter<T>();
writer.setEntityManagerFactory(emf);
return writer;
}
But which scope is right here? 但是哪个范围就在这里? And why? 为什么?
Execution with step
scope works, but I feel the itemWriters should maybe be of job
scope so that they are not recreated on every step. 使用step
范围执行有效,但我觉得itemWrite应该是job
范围,这样就不会在每一步都重新创建它们。
I tried switching step
to job
, but that throws following error: Exception in thread "main" java.lang.IllegalStateException: No Scope registered for scope 'job'
我尝试将step
切换到job
,但是会抛出以下错误: Exception in thread "main" java.lang.IllegalStateException: No Scope registered for scope 'job'
Since Spring-Batch v3.0.1 you can use @JobScope 从Spring-Batch v3.0.1开始,您可以使用@JobScope
Marking a @Bean as @JobScope is equivalent to marking it as @Scope(value="job", proxyMode=TARGET_CLASS) 将@Bean标记为@JobScope相当于将其标记为@Scope(value =“job”,proxyMode = TARGET_CLASS)
Got it: one has to provide the scope as a bean explicit within the @Configuration
file. 得到它:必须在@Configuration
文件中提供作为bean显式的范围。
@Bean
public JobScope jobScope() {
return new JobScope();
}
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