Examples of org.springframework.batch.repeat.support.RepeatTemplate

Package org.springframework.batch.repeat.support

Examples of org.springframework.batch.repeat.support.RepeatTemplate

org.springframework.batch.repeat.support.RepeatTemplate
Simple implementation and base class for batch templates implementing {@link RepeatOperations}. Provides a framework including interceptors and policies. Subclasses just need to provide a method that gets the next result and one that waits for all the results to be returned from concurrent processes or threads.
N.B. the template accumulates thrown exceptions during the iteration, and they are all processed together when the main loop ends (i.e. finished processing the items). Clients that do not want to stop execution when an exception is thrown can use a specific {@link CompletionPolicy} that does notfinish when exceptions are received. This is not the default behaviour.
Clients that want to take some business action when an exception is thrown by the {@link RepeatCallback} can consider using a custom {@link RepeatListener}instead of trying to customise the {@link CompletionPolicy}. This is generally a friendlier interface to implement, and the {@link RepeatListener#after(RepeatContext,RepeatStatus)} method is passed inthe result of the callback, which would be an instance of {@link Throwable}if the business processing had thrown an exception. If the exception is not to be propagated to the caller, then a non-default {@link CompletionPolicy}needs to be provided as well, but that could be off the shelf, with the business action implemented only in the interceptor. @author Dave Syer

    // ... so the interceptor after() is not called:
    assertEquals("[2, 1]", calls.toString());
  }


  public void testOpenInterceptors() throws Exception {
    RepeatTemplate template = new RepeatTemplate();
    final List<Object> calls = new ArrayList<Object>();
    template.setListeners(new RepeatListener[] { new RepeatListenerSupport() {
            @Override
      public void open(RepeatContext context) {
        calls.add("1");
      }
    }, new RepeatListenerSupport() {
            @Override
      public void open(RepeatContext context) {
        calls.add("2");
        context.setCompleteOnly();
      }
    } });
    template.iterate(new RepeatCallback() {
            @Override
      public RepeatStatus doInIteration(RepeatContext context) throws Exception {
        count++;
        return RepeatStatus.CONTINUABLE;
      }

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    assertEquals(0, count);
    assertEquals("[1, 2]", calls.toString());
  }


  public void testSingleOpenInterceptor() throws Exception {
    RepeatTemplate template = new RepeatTemplate();
    final List<Object> calls = new ArrayList<Object>();
    template.registerListener(new RepeatListenerSupport() {
            @Override
      public void open(RepeatContext context) {
        calls.add("1");
      }
    });
    template.iterate(new RepeatCallback() {
            @Override
      public RepeatStatus doInIteration(RepeatContext context) throws Exception {
        count++;
        context.setCompleteOnly();
        return RepeatStatus.FINISHED;

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    assertEquals(1, count);
    assertEquals("[1]", calls.toString());
  }


  public void testCloseInterceptors() throws Exception {
    RepeatTemplate template = new RepeatTemplate();
    final List<Object> calls = new ArrayList<Object>();
    template.setListeners(new RepeatListener[] { new RepeatListenerSupport() {
            @Override
      public void close(RepeatContext context) {
        calls.add("1");
      }
    }, new RepeatListenerSupport() {
            @Override
      public void close(RepeatContext context) {
        calls.add("2");
      }
    } });
    template.iterate(new RepeatCallback() {
            @Override
      public RepeatStatus doInIteration(RepeatContext context) throws Exception {
        count++;
        return RepeatStatus.continueIf(count < 2);
      }

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    assertEquals("[2, 1]", calls.toString());
  }




  public void testOnErrorInterceptors() throws Exception {
    RepeatTemplate template = new RepeatTemplate();
    final List<Object> calls = new ArrayList<Object>();
    template.setListeners(new RepeatListener[] { new RepeatListenerSupport() {
            @Override
      public void onError(RepeatContext context, Throwable t) {
        calls.add("1");
      }
    }, new RepeatListenerSupport() {
            @Override
      public void onError(RepeatContext context, Throwable t) {
        calls.add("2");
      }
    } });
    try {
      template.iterate(new RepeatCallback() {
                @Override
        public RepeatStatus doInIteration(RepeatContext context) throws Exception {
          throw new IllegalStateException("Bogus");
        }
      });

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    assertEquals(0, count);
    assertEquals("[2, 1]", calls.toString());
  }


  public void testOnErrorInterceptorsPrecedence() throws Exception {
    RepeatTemplate template = new RepeatTemplate();
    final List<Object> calls = new ArrayList<Object>();
    template.setListeners(new RepeatListener[] { new RepeatListenerSupport() {
            @Override
      public void after(RepeatContext context, RepeatStatus result) {
        calls.add("1");
      }
    }, new RepeatListenerSupport() {
            @Override
      public void onError(RepeatContext context, Throwable t) {
        calls.add("2");
      }
    } });
    try {
      template.iterate(new RepeatCallback() {
                @Override
        public RepeatStatus doInIteration(RepeatContext context) throws Exception {
          throw new IllegalStateException("Bogus");
        }
      });

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  }


  private TaskletStep getStep(String[] strings, int commitInterval) throws Exception {
    TaskletStep step = new TaskletStep("stepName");
    // Only process one item:
    RepeatTemplate template = new RepeatTemplate();
    template.setCompletionPolicy(new SimpleCompletionPolicy(commitInterval));
    step.setTasklet(new TestingChunkOrientedTasklet<String>(getReader(strings), itemWriter, template));
    step.setJobRepository(new JobRepositorySupport());
    step.setTransactionManager(transactionManager);
    return step;
  }

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  @Before
  public void setUp() throws Exception {


    transactionManager = new ResourcelessTransactionManager();


    RepeatTemplate template = new RepeatTemplate();
    template.setCompletionPolicy(new SimpleCompletionPolicy(1));


    step = getStep(new String[] { "foo", "bar", "spam" });
    step.setStepOperations(template);


    job = new JobSupport("FOO");

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  public void testEmptyReader() throws Exception {
    JobExecution jobExecutionContext = new JobExecution(jobInstance, jobParameters);
    StepExecution stepExecution = new StepExecution(step.getName(), jobExecutionContext);
    step = getStep(new String[0]);
    step.setTasklet(new TestingChunkOrientedTasklet<String>(getReader(new String[0]), itemWriter,
        new RepeatTemplate()));
    step.setStepOperations(new RepeatTemplate());
    step.execute(stepExecution);
    assertEquals(0, processed.size());
    assertEquals(0, stepExecution.getReadCount());
    // Commit after end of data detected (this leads to the commit count
    // being one greater than people expect if the commit interval is

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  public void testStepExecutionUpdates() throws Exception {


    JobExecution jobExecution = new JobExecution(jobInstance, jobParameters);
    StepExecution stepExecution = new StepExecution(step.getName(), jobExecution);


    step.setStepOperations(new RepeatTemplate());


    JobRepositoryStub jobRepository = new JobRepositoryStub();
    step.setJobRepository(jobRepository);


    step.execute(stepExecution);

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        list.add("afterStepCalled");
        return customStatus;
      }
    } });


    RepeatTemplate stepTemplate = new RepeatTemplate();
    stepTemplate.setCompletionPolicy(new SimpleCompletionPolicy(5));
    step.setStepOperations(stepTemplate);


    JobExecution jobExecution = new JobExecution(jobInstance, jobParameters);
    StepExecution stepExecution = new StepExecution(step.getName(), jobExecution);
    step.execute(stepExecution);

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