Spring 集成 DSL - JdbcPollingChannelAdapter 结果未排队

Question

我发誓我有这个工作，但当我在几个月后恢复它时（并升级到 Boot 1.5.9），我遇到了问题。

我设置了一个 JdbcPollingChannelAdapter，我可以很好地执行 receive()，但是当我将适配器放入一个仅对适配器结果进行排队的流中时，运行.receive在队列上总是 returns 一个 null（我可以在控制台日志中看到适配器的 SQL 正在执行）。

测试如下。为什么我可以从适配器获取结果，但不能对结果进行排队？提前感谢您的帮助。

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureTestDatabase
@JdbcTest
public class JdbcpollingchanneladapterdemoTests {

  @Autowired
  @Qualifier("dataSource")
  DataSource dataSource;

  private static PollableChannel outputQueue;

    @BeforeClass
    public static void setupClass() {
    outputQueue = MessageChannels.queue().get();
        return;
    }

    @Test
    public void Should_HaveQueue() {
        assertThat(outputQueue, instanceOf(QueueChannel.class));
    }

    @Test
  @Sql(executionPhase = ExecutionPhase.BEFORE_TEST_METHOD,
      statements = "Create Table DEMO (CODE VARCHAR(5));")
  @Sql(executionPhase = ExecutionPhase.AFTER_TEST_METHOD,
      statements = "Drop Table DEMO ;")
    public void Should_Not_HaveMessageOnTheQueue_When_No_DemosAreInTheDatabase() {
        Message<?> message = outputQueue.receive(5000);
        assertThat(message, nullValue()) ;
    }

  @Test
  @Sql(executionPhase = ExecutionPhase.BEFORE_TEST_METHOD,
      statements = "Create Table DEMO (CODE VARCHAR(5));")
  @Sql(executionPhase = ExecutionPhase.BEFORE_TEST_METHOD,
      statements = "Insert into DEMO (CODE) VALUES ('12345');")
  @Sql(executionPhase = ExecutionPhase.AFTER_TEST_METHOD,
      statements = "Drop Table DEMO ;")
  public void Should_HaveMessageOnTheQueue_When_DemosIsInTheDatabase() {
    assertThat(outputQueue, instanceOf(QueueChannel.class));
    Message<?> message = outputQueue.receive(5000);
    assertThat(message, notNullValue());
    assertThat(message.getPayload().toString(), equalTo("15317")) ;
  }

  @Test
  @Sql(executionPhase = ExecutionPhase.BEFORE_TEST_METHOD,
      statements = "Create Table DEMO (CODE VARCHAR(5));")
  @Sql(executionPhase = ExecutionPhase.BEFORE_TEST_METHOD,
      statements = "Insert into DEMO (CODE) VALUES ('12345');")
  @Sql(executionPhase = ExecutionPhase.AFTER_TEST_METHOD,
      statements = "Drop Table DEMO ;")
  public void get_message_directly_from_adapter() {
    JdbcPollingChannelAdapter adapter =
        new JdbcPollingChannelAdapter(dataSource, "SELECT CODE FROM DEMO");
    adapter.setRowMapper(new DemoRowMapper());
    adapter.setMaxRowsPerPoll(1);
    Message<?> message = adapter.receive();
    assertThat(message, notNullValue());
  }


  private static class Demo {

    private String demo;

    String getDemo() {
      return demo;
    }

    void setDemo(String value) {
      this.demo = value;
    }

    @Override
    public String toString() {
      return "Demo [value=" + this.demo + "]";
    }
  }

  public static class DemoRowMapper implements RowMapper<Demo> {

    @Override
    public Demo mapRow(ResultSet rs, int rowNum) throws SQLException {
      Demo demo = new Demo();
      demo.setDemo(rs.getString("CODE"));
      return demo;
    }
  }

  @Component
  public static class MyFlowAdapter extends IntegrationFlowAdapter {

    @Autowired
    @Qualifier("dataSource")
    DataSource dataSource;

    @Override
    protected IntegrationFlowDefinition<?> buildFlow() {

      JdbcPollingChannelAdapter adapter =
          new JdbcPollingChannelAdapter(dataSource, "SELECT CODE FROM DEMO");
      adapter.setRowMapper(new DemoRowMapper());
      adapter.setMaxRowsPerPoll(1);

      return from(adapter,
          c -> c.poller(Pollers.fixedRate(1000L, 2000L)
              .maxMessagesPerPoll(1)
              .get()))
          .channel(outputQueue);
    }
  }
}

EDIT 我已经尽可能地简化它，重构为下面的代码。该测试通过了具有通用消息源的流，但在具有 JdbcPollingChannelAdapter 消息源的流上失败。我只是不清楚应该如何配置第二个消息源，以便它像第一个消息源一样成功。

  @Test
  @Sql(executionPhase = ExecutionPhase.BEFORE_TEST_METHOD,
      statements = "Create Table DEMO (CODE VARCHAR(5));")
  @Sql(executionPhase = ExecutionPhase.BEFORE_TEST_METHOD,
      statements = "Insert into DEMO (CODE) VALUES ('12345');")
  public void Should_HaveMessageOnTheQueue_When_UnsentDemosIsInTheDatabase() {

this.genericFlowContext.registration(new GenericFlowAdapter()).register();

PollableChannel genericChannel = this.beanFactory.getBean("GenericFlowAdapterOutput",
    PollableChannel.class);

this.jdbcPollingFlowContext.registration(new JdbcPollingFlowAdapter()).register();

PollableChannel jdbcPollingChannel = this.beanFactory.getBean("JdbcPollingFlowAdapterOutput",
    PollableChannel.class);

assertThat(genericChannel.receive(5000).getPayload(), equalTo("15317"));

assertThat(jdbcPollingChannel.receive(5000).getPayload(), equalTo("15317"));
  }

  private static class GenericFlowAdapter extends IntegrationFlowAdapter {

@Override
protected IntegrationFlowDefinition<?> buildFlow() {
  return from(getObjectMessageSource(),
      e -> e.poller(Pollers.fixedRate(100)))
      .channel(c -> c.queue("GenericFlowAdapterOutput"));
}

private MessageSource<Object> getObjectMessageSource() {
  return () -> new GenericMessage<>("15317");
}
}

private static class JdbcPollingFlowAdapter extends IntegrationFlowAdapter {

@Autowired
@Qualifier("dataSource")
DataSource dataSource;

@Override
protected IntegrationFlowDefinition<?> buildFlow() {
  return from(getObjectMessageSource(),
      e -> e.poller(Pollers.fixedRate(100)))
      .channel(c -> c.queue("JdbcPollingFlowAdapterOutput"));
}

private MessageSource<Object> getObjectMessageSource() {
  JdbcPollingChannelAdapter adapter =
      new JdbcPollingChannelAdapter(dataSource, "SELECT CODE FROM DEMO");
  adapter.setRowMapper(new DemoRowMapper());
  adapter.setMaxRowsPerPoll(1);
  return adapter;
}
  }

Answer 1

看来您需要将 @EnableIntegration 添加到您的测试配置中。当您使用 Spring 引导片进行测试时，并非所有自动配置都被加载：

https://docs.spring.io/spring-boot/docs/1.5.9.RELEASE/reference/htmlsingle/#test-auto-configuration

更新

JdbcPollingChannelAdapter 的问题是运行在单独的计划线程中，已经超出了围绕测试方法的原始事务，其中执行了那些 @Sql。

你的修复方法是这样的：

@Sql(executionPhase = ExecutionPhase.BEFORE_TEST_METHOD,
      statements = "Insert into DEMO (CODE) VALUES ('12345');",
      config = @SqlConfig(transactionMode = SqlConfig.TransactionMode.ISOLATED))

注意那个SqlConfig.TransactionMode.ISOLATED。这样 INSERT 事务被提交并且数据可用于 JdbcPollingChannelAdapter.

的单独轮询线程

还要注意这个JdbcPollingChannelAdapter总是returns一条List条记录。因此，即使 table.

中只有一条记录，您的 assertThat(jdbcPollingChannel.receive(5000).getPayload(), ...); 也应该反对 List<String>

Spring 集成 DSL - JdbcPollingChannelAdapter 结果未排队

Spring Integration DSL - JdbcPollingChannelAdapter results not queueing

spring-integration

spring-boot

spring-integration-dsl