Spring-Batch @BeforeStep不适用于@StepScope
我正在使用Spring Batch版本2.2.4.RELEASE我试图用有状态的ItemReader,ItemProcessor和ItemWriter Bean编写一个简单的示例。
public class StatefulItemReader implements ItemReader<String> { private List<String> list;
@BeforeStep
public void initializeState(StepExecution stepExecution) {
this.list = new ArrayList<>();
}
@AfterStep
public ExitStatus exploitState(StepExecution stepExecution) {
System.out.println("******************************");
System.out.println(" READING RESULTS : " + list.size());
return stepExecution.getExitStatus();
}
@Override
public String read() throws Exception {
this.list.add("some stateful reading information");
if (list.size() < 10) {
return "value " + list.size();
}
return null;
}
}
在集成测试中,我在内部静态java config类中声明我的bean,如下所示:
@ContextConfiguration@RunWith(SpringJUnit4ClassRunner.class)
public class SingletonScopedTest {
@Configuration
@EnableBatchProcessing
static class TestConfig {
@Autowired
private JobBuilderFactory jobBuilder;
@Autowired
private StepBuilderFactory stepBuilder;
@Bean
JobLauncherTestUtils jobLauncherTestUtils() {
return new JobLauncherTestUtils();
}
@Bean
public DataSource dataSource() {
EmbeddedDatabaseBuilder embeddedDatabaseBuilder = new EmbeddedDatabaseBuilder();
return embeddedDatabaseBuilder.addScript("classpath:org/springframework/batch/core/schema-drop-hsqldb.sql")
.addScript("classpath:org/springframework/batch/core/schema-hsqldb.sql")
.setType(EmbeddedDatabaseType.HSQL)
.build();
}
@Bean
public Job jobUnderTest() {
return jobBuilder.get("job-under-test")
.start(stepUnderTest())
.build();
}
@Bean
public Step stepUnderTest() {
return stepBuilder.get("step-under-test")
.<String, String>chunk(1)
.reader(reader())
.processor(processor())
.writer(writer())
.build();
}
@Bean
public ItemReader<String> reader() {
return new StatefulItemReader();
}
@Bean
public ItemProcessor<String, String> processor() {
return new StatefulItemProcessor();
}
@Bean
public ItemWriter<String> writer() {
return new StatefulItemWriter();
}
}
@Autowired
JobLauncherTestUtils jobLauncherTestUtils;
@Test
public void testStepExecution() {
JobExecution jobExecution = jobLauncherTestUtils.launchStep("step-under-test");
assertEquals(ExitStatus.COMPLETED, jobExecution.getExitStatus());
}
}
该测试通过。
但是,一旦我将StatefulItemReader定义为步域范围的bean(这对于有状态阅读器比较好),就不再执行“步骤前”代码。
... @Bean
@StepScope
public ItemReader<String> reader() {
return new StatefulItemReader();
}
...
而且我注意到处理器和我的编写器bean存在相同的问题。
回答:
当你按如下方式配置bean时:
@Bean@StepScope
public MyInterface myBean() {
return new MyInterfaceImpl();
}
你正在告诉Spring使用代理模式ScopedProxyMode.TARGET_CLASS
。但是,通过返回MyInterface
而不是返回,MyInterfaceImpl
代理仅具有对上方法的可见性MyInterface
。这将阻止Spring Batch
能够在MyInterfaceImpl
已使用侦听器注释(例如)进行注释的方法上找到方法@BeforeStep。正确MyInterfaceImpl
的配置方法是返回你的配置方法,如下所示:
@Bean@StepScope
public MyInterfaceImpl myBean() {
return new MyInterfaceImpl();
}
我们在启动时添加了一条警告日志消息,该消息指出,当我们寻找带注释的侦听器方法时,如果该对象被代理并且目标是接口,则将无法在实现类上找到带有注释的方法他们。
以上是 Spring-Batch @BeforeStep不适用于@StepScope 的全部内容, 来源链接: utcz.com/qa/435928.html