[英]Spring batch execute dynamically generated steps in a tasklet
我有一個春季批處理工作,執行以下操作...
步驟1.創建需要處理的對象列表
步驟2.根據步驟1中創建的對象列表中的項目數創建步驟列表。
步驟3.嘗試執行步驟2中創建的步驟列表中的步驟。
執行x步驟在executeDynamicStepsTasklet()中完成。 雖然代碼運行沒有任何錯誤,但它似乎沒有做任何事情。 我在該方法中看到的內容是否正確?
謝謝
/ * * * /
@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;
}
所以現在我有一個需要執行的動態步驟列表,我相信它們在StepScope中。 有人可以告訴我如何執行它們
這不行。 您的Tasklet只是創建一個FlowStep作為第一步的作業。 使用jobBuilderfactory只創建作業。 它沒有啟動它。 方法名“start”可能會產生誤導,因為這只定義了第一步。 但它沒有啟動這項工作。
一旦啟動,您就無法更改作業的結構(其步驟和子步驟)。 因此,不可能根據步驟1中計算的內容在步驟2中配置流程步驟。(當然,您可以在彈簧結構內部進行更深入的黑客攻擊並直接修改bean等等......但是你不要我想這樣做)。
我建議你使用一種“SetupBean”和一個適當的postConstruct方法,該方法被注入你的類來配置你的工作。 這個“SetupBean”負責計算正在處理的對象列表。
@Component
public class SetUpBean {
private List<Object> myObjects;
@PostConstruct
public afterPropertiesSet() {
myObjects = ...;
}
public List<Object> getMyObjects() {
return myObjects;
}
}
@Configuration
public class JobConfiguration {
@Autowired
private JobBuilderFactory jobBuilderFactory;
@Autowired
private StepBuilderFactory stepBuilderFactory;
@Autowired
private SetUpBean setup;
...
}
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