我有一个 Spring 季批处理工作,执行以下操作...
步骤1.创建需要处理的对象列表
步骤2.根据步骤1中创建的对象列表中的项目数创建步骤列表 .
步骤3.尝试执行步骤2中创建的步骤列表中的步骤 .
执行x步骤在executeDynamicStepsTasklet()中完成 . 虽然代码运行没有任何错误,但它似乎没有做任何事情 . 我在该方法中看到的内容是否正确?
谢谢
/ * * * /
@Configuration
public class ExportMasterListCsvJobConfig {
public static final String JOB_NAME = "exportMasterListCsv";
@Autowired
public JobBuilderFactory jobBuilderFactory;
@Autowired
public StepBuilderFactory stepBuilderFactory;
@Value("${exportMasterListCsv.generateMasterListRows.chunkSize}")
public int chunkSize;
@Value("${exportMasterListCsv.generateMasterListRows.masterListSql}")
public String masterListSql;
@Autowired
public DataSource onlineStagingDb;
@Value("${out.dir}")
public String outDir;
@Value("${exportMasterListCsv.generatePromoStartDateEndDateGroupings.promoStartDateEndDateSql}")
private String promoStartDateEndDateSql;
private List<DivisionIdPromoCompStartDtEndDtGrouping> divisionIdPromoCompStartDtEndDtGrouping;
private List<Step> dynamicSteps = Collections.synchronizedList(new ArrayList<Step>()) ;
@Bean
public Job exportMasterListCsvJob(
@Qualifier("createJobDatesStep") Step createJobDatesStep,
@Qualifier("createDynamicStepsStep") Step createDynamicStepsStep,
@Qualifier("executeDynamicStepsStep") Step executeDynamicStepsStep) {
return jobBuilderFactory.get(JOB_NAME)
.flow(createJobDatesStep)
.next(createDynamicStepsStep)
.next(executeDynamicStepsStep)
.end().build();
}
@Bean
public Step executeDynamicStepsStep(
@Qualifier("executeDynamicStepsTasklet") Tasklet executeDynamicStepsTasklet) {
return stepBuilderFactory
.get("executeDynamicStepsStep")
.tasklet(executeDynamicStepsTasklet)
.build();
}
@Bean
public Tasklet executeDynamicStepsTasklet() {
return new Tasklet() {
@Override
public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {
FlowStep flowStep = new FlowStep(createParallelFlow());
SimpleJobBuilder jobBuilder = jobBuilderFactory.get("myNewJob").start(flowStep);
return RepeatStatus.FINISHED;
}
};
}
public Flow createParallelFlow() {
SimpleAsyncTaskExecutor taskExecutor = new SimpleAsyncTaskExecutor();
taskExecutor.setConcurrencyLimit(1);
List<Flow> flows = dynamicSteps.stream()
.map(step -> new FlowBuilder<Flow>("flow_" + step.getName()).start(step).build())
.collect(Collectors.toList());
return new FlowBuilder<SimpleFlow>("parallelStepsFlow")
.split(taskExecutor)
.add(flows.toArray(new Flow[flows.size()]))
.build();
}
@Bean
public Step createDynamicStepsStep(
@Qualifier("createDynamicStepsTasklet") Tasklet createDynamicStepsTasklet) {
return stepBuilderFactory
.get("createDynamicStepsStep")
.tasklet(createDynamicStepsTasklet)
.build();
}
@Bean
@JobScope
public Tasklet createDynamicStepsTasklet() {
return new Tasklet() {
@Override
public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {
for (DivisionIdPromoCompStartDtEndDtGrouping grp: divisionIdPromoCompStartDtEndDtGrouping){
System.err.println("grp: " + grp);
String stepName = "stp_" + grp;
String fileName = grp + FlatFileConstants.EXTENSION_CSV;
Step dynamicStep =
stepBuilderFactory.get(stepName)
.<MasterList,MasterList> chunk(10)
.reader(queryStagingDbReader(
grp.getDivisionId(),
grp.getRpmPromoCompDetailStartDate(),
grp.getRpmPromoCompDetailEndDate()))
.writer(masterListFileWriter(fileName))
.build();
dynamicSteps.add(dynamicStep);
}
System.err.println("createDynamicStepsTasklet dynamicSteps: " + dynamicSteps);
return RepeatStatus.FINISHED;
}
};
}
public FlatFileItemWriter<MasterList> masterListFileWriter(String fileName) {
FlatFileItemWriter<MasterList> writer = new FlatFileItemWriter<>();
writer.setResource(new FileSystemResource(new File(outDir, fileName )));
writer.setHeaderCallback(masterListFlatFileHeaderCallback());
writer.setLineAggregator(masterListFormatterLineAggregator());
return writer;
}
所以现在我有一个需要执行的动态步骤列表,我相信它们在StepScope中 . 有人可以告诉我如何执行它们
1 回答
这不行 . 您的Tasklet只是创建一个FlowStep作为第一步的作业 . 使用jobBuilderfactory只创建作业 . 它没有启动它 . 方法名“start”可能会产生误导,因为这只定义了第一步 . 但它没有启动这项工作 .
一旦启动,您就无法更改作业的结构(其步骤和子步骤) . 因此,不可能根据步骤1中计算的内容在步骤2中配置流程步骤 . (当然,您可以在 spring 结构内部进行更深入的黑客攻击并直接修改bean等等......但是你不要我想这样做) .
我建议你使用一种“SetupBean”和一个适当的postConstruct方法,该方法被注入你的类来配置你的工作 . 这个“SetupBean”负责计算正在处理的对象列表 .