如何在spring batch中使用MultiResourceItemReader指定任务执行器在读取单个csv后派生线程

Resource[] resources = new PathMatchingResourcePatternResolver().getResources("file:/path/to/csv/files/*.csv");

FlatFileItemReader<MyObject> reader = new FlatFileItemReader<>();
reader.setLineMapper(new DefaultLineMapper<MyObject>() {{
    setLineTokenizer(new DelimitedLineTokenizer() {{
        setNames(new String[] {"column1", "column2", "column3"});
    }});
    setFieldSetMapper(new BeanWrapperFieldSetMapper<MyObject>() {{
        setTargetType(MyObject.class);
    }});
}});

TaskExecutor taskExecutor = new SimpleAsyncTaskExecutor("MyTaskExecutor");

MultiResourceItemReader<MyObject> multiResourceItemReader = new MultiResourceItemReader<>();
multiResourceItemReader.setResources(resources);
multiResourceItemReader.setDelegate(reader);

Step step = stepBuilderFactory.get("myStep")
        .<MyObject, MyObject>chunk(10)
        .reader(multiResourceItemReader)
        .processor(processor)
        .writer(writer)
        .taskExecutor(taskExecutor)
        .build();

Job job = jobBuilderFactory.get("myJob")
        .start(step)
        .build();

jobLauncher.run(job, new JobParameters());