Examples of MessageBus

com.intellij.util.messages.MessageBus

Core of IntelliJ IDEA messaging infrastructure. Basic functions:

  allows to  {@link #syncPublisher(Topic) push messages};
  allows to  {@link #connect() create connections} for further {@link MessageBusConnection#subscribe(Topic,Object) subscriptions};

Use 'com.intellij.openapi.components.ComponentManager#getMessageBus()' to obtain one.

org.jboss.errai.bus.client.api.messaging.MessageBus
omething. } } ); The API for creating services is heterogeneous in both client and server code. The only semantic difference involves obtaining an instance of the MessageBus which is done using the {@link org.jboss.errai.bus.client.ErraiBus#get()} method in client code,and by default, is provided by the container using dependency injection in the server code. For example:
```
@Service public class MyService {private MessageBus bus; 
@Inject public MyService(MessageBus bus) {this.bus = bus; }  ... } 
```
@author Mike Brock
org.jboss.errai.bus.client.framework.MessageBus
omething. } } ); The API for creating services is heterogeneous in both client and server code. The only semantic difference involves obtaining an instance of the MessageBus which is done using the {@link org.jboss.errai.bus.client.ErraiBus#get()} method in client code,and by default, is provided by the container using dependency injection in the server code. For example:
```
@Service public class MyService {private MessageBus bus; 
@Inject public MyService(MessageBus bus) {this.bus = bus; }  ... } 
```
org.springframework.xd.dirt.integration.bus.MessageBus
A strategy interface used to bind a {@link MessageChannel} to a logical name. The name is intended to identify alogical consumer or producer of messages. This may be a queue, a channel adapter, another message channel, a Spring bean, etc. @author Mark Fisher @author David Turanski @author Gary Russell @author Jennifer Hickey @author Ilayaperumal Gopinathan @since 1.0

Examples of org.springframework.xd.dirt.integration.bus.MessageBus

    String streamName = "test";


    StreamDefinition testStream = new StreamDefinition(streamName, streamDefinition);
    integrationSupport.createAndDeployStream(testStream);


    MessageBus messageBus = integrationSupport.messageBus();


    NamedChannelSource source = new SingleNodeNamedChannelSourceFactory(messageBus).createNamedChannelSource("queue:producer");
    NamedChannelSink sink = new SingleNodeNamedChannelSinkFactory(messageBus).createNamedChannelSink("queue:consumer");


    source.sendPayload("ping");

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Examples of org.springframework.xd.dirt.integration.bus.MessageBus

  }


  @Override
  protected void checkBusBound(MessageBus bus) {
    if (bus instanceof RedisTestMessageBus) {
      MessageBus msgBus = ((RedisTestMessageBus) bus).getCoreMessageBus();
      assertEquals(4, TestUtils.getPropertyValue(msgBus, "bindings", Collection.class).size());
    }
  }

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Examples of org.springframework.xd.dirt.integration.bus.MessageBus

  }


  @Override
  protected void checkBusUnbound(MessageBus bus) {
    if (bus instanceof RedisTestMessageBus) {
      MessageBus msgBus = ((RedisTestMessageBus) bus).getCoreMessageBus();
      assertEquals(0, TestUtils.getPropertyValue(msgBus, "bindings", Collection.class).size());
    }
  }

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Examples of org.springframework.xd.dirt.integration.bus.MessageBus

    createTemplate().boundListOps("queue.direct.0").trim(1, 0);
  }


  @Test
  public void testConsumerProperties() throws Exception {
    MessageBus bus = getMessageBus();
    Properties properties = new Properties();
    properties.put("maxAttempts", "1"); // disable retry
    bus.bindConsumer("props.0", new DirectChannel(), properties);
    @SuppressWarnings("unchecked")
    List<Binding> bindings = TestUtils.getPropertyValue(bus, "messageBus.bindings", List.class);
    assertEquals(1, bindings.size());
    AbstractEndpoint endpoint = bindings.get(0).getEndpoint();
    assertThat(endpoint, instanceOf(RedisQueueMessageDrivenEndpoint.class));
    assertSame(DirectChannel.class, TestUtils.getPropertyValue(endpoint, "outputChannel").getClass());
    bus.unbindConsumers("props.0");
    assertEquals(0, bindings.size());


    properties.put("backOffInitialInterval", "2000");
    properties.put("backOffMaxInterval", "20000");
    properties.put("backOffMultiplier", "5.0");
    properties.put("concurrency", "2");
    properties.put("maxAttempts", "23");
    properties.put("partitionIndex", 0);


    bus.bindConsumer("props.0", new DirectChannel(), properties);
    assertEquals(1, bindings.size());
    endpoint = bindings.get(0).getEndpoint();
    verifyConsumer(endpoint);


    try {
      bus.bindPubSubConsumer("dummy", null, properties);
      fail("Expected exception");
    }
    catch (IllegalArgumentException e) {
      assertThat(e.getMessage(), allOf(
          containsString("RedisMessageBus does not support consumer properties: "),
          containsString("partitionIndex"),
          containsString("concurrency"),
          containsString(" for dummy.")));
    }
    try {
      bus.bindConsumer("queue:dummy", null, properties);
      fail("Expected exception");
    }
    catch (IllegalArgumentException e) {
      assertEquals("RedisMessageBus does not support consumer property: partitionIndex for queue:dummy.",
          e.getMessage());
    }


    bus.unbindConsumers("props.0");
    assertEquals(0, bindings.size());
  }

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Examples of org.springframework.xd.dirt.integration.bus.MessageBus

    assertEquals(0, bindings.size());
  }


  @Test
  public void testProducerProperties() throws Exception {
    MessageBus bus = getMessageBus();
    bus.bindProducer("props.0", new DirectChannel(), null);
    @SuppressWarnings("unchecked")
    List<Binding> bindings = TestUtils.getPropertyValue(bus, "messageBus.bindings", List.class);
    assertEquals(1, bindings.size());
    AbstractEndpoint endpoint = bindings.get(0).getEndpoint();
    assertEquals(
        "queue.props.0",
        TestUtils.getPropertyValue(endpoint, "handler.delegate.queueNameExpression", Expression.class).getExpressionString());
    bus.unbindProducers("props.0");
    assertEquals(0, bindings.size());


    Properties properties = new Properties();
    properties.put("partitionKeyExpression", "'foo'");
    properties.put("partitionKeyExtractorClass", "foo");
    properties.put("partitionSelectorExpression", "0");
    properties.put("partitionSelectorClass", "foo");
    properties.put("partitionCount", "1");


    bus.bindProducer("props.0", new DirectChannel(), properties);
    assertEquals(1, bindings.size());
    endpoint = bindings.get(0).getEndpoint();
    assertEquals(
        "'queue.props.0-' + headers['partition']",
        TestUtils.getPropertyValue(endpoint, "handler.delegate.queueNameExpression", Expression.class).getExpressionString());


    try {
      bus.bindPubSubProducer("dummy", null, properties);
      fail("Expected exception");
    }
    catch (IllegalArgumentException e) {
      assertThat(e.getMessage(), allOf(
          containsString("RedisMessageBus does not support producer properties: "),
          containsString("partitionCount"),
          containsString("partitionSelectorExpression"),
          containsString("partitionKeyExtractorClass"),
          containsString("partitionKeyExpression"),
          containsString("partitionSelectorClass")));
      assertThat(e.getMessage(), containsString("for dummy."));
    }
    try {
      bus.bindProducer("queue:dummy", new DirectChannel(), properties);
      fail("Expected exception");
    }
    catch (IllegalArgumentException e) {
      assertThat(e.getMessage(), allOf(
          containsString("RedisMessageBus does not support producer properties: "),
          containsString("partitionCount"),
          containsString("partitionSelectorExpression"),
          containsString("partitionKeyExtractorClass"),
          containsString("partitionKeyExpression"),
          containsString("partitionSelectorClass")));
      assertThat(e.getMessage(), containsString("for queue:dummy."));
    }


    bus.unbindProducers("props.0");
    assertEquals(0, bindings.size());
  }

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Examples of org.springframework.xd.dirt.integration.bus.MessageBus

    assertEquals(0, bindings.size());
  }


  @Test
  public void testRequestReplyRequestorProperties() throws Exception {
    MessageBus bus = getMessageBus();
    Properties properties = new Properties();


    properties.put("backOffInitialInterval", "2000");
    properties.put("backOffMaxInterval", "20000");
    properties.put("backOffMultiplier", "5.0");
    properties.put("concurrency", "2");
    properties.put("maxAttempts", "23");


    bus.bindRequestor("props.0", new DirectChannel(), new DirectChannel(), properties);
    @SuppressWarnings("unchecked")
    List<Binding> bindings = TestUtils.getPropertyValue(bus, "messageBus.bindings", List.class);


    assertEquals(2, bindings.size());
    AbstractEndpoint endpoint = bindings.get(0).getEndpoint(); // producer
    assertEquals(
        "queue.props.0.requests",
        TestUtils.getPropertyValue(endpoint, "handler.delegate.queueNameExpression", Expression.class).getExpressionString());


    endpoint = bindings.get(1).getEndpoint(); // consumer
    verifyConsumer(endpoint);


    properties.put("partitionKeyExpression", "'foo'");
    properties.put("partitionKeyExtractorClass", "foo");
    properties.put("partitionSelectorExpression", "0");
    properties.put("partitionSelectorClass", "foo");
    properties.put("partitionCount", "1");
    properties.put("partitionIndex", "0");
    try {
      bus.bindRequestor("dummy", new DirectChannel(), new DirectChannel(), properties);
      fail("Expected exception");
    }
    catch (IllegalArgumentException e) {
      assertThat(e.getMessage(), allOf(
          containsString("RedisMessageBus does not support producer properties: "),
          containsString("partitionCount"),
          containsString("partitionSelectorExpression"),
          containsString("partitionKeyExtractorClass"),
          containsString("partitionKeyExpression"),
          containsString("partitionSelectorClass")));
      assertThat(e.getMessage(), allOf(containsString("partitionIndex"), containsString("for dummy.")));
    }


    bus.unbindConsumers("props.0");
    bus.unbindProducers("props.0");
    assertEquals(0, bindings.size());
  }

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Examples of org.springframework.xd.dirt.integration.bus.MessageBus

    assertEquals(0, bindings.size());
  }


  @Test
  public void testRequestReplyReplierProperties() throws Exception {
    MessageBus bus = getMessageBus();
    Properties properties = new Properties();


    properties.put("backOffInitialInterval", "2000");
    properties.put("backOffMaxInterval", "20000");
    properties.put("backOffMultiplier", "5.0");
    properties.put("concurrency", "2");
    properties.put("maxAttempts", "23");


    bus.bindReplier("props.0", new DirectChannel(), new DirectChannel(), properties);
    @SuppressWarnings("unchecked")
    List<Binding> bindings = TestUtils.getPropertyValue(bus, "messageBus.bindings", List.class);


    assertEquals(2, bindings.size());
    AbstractEndpoint endpoint = bindings.get(1).getEndpoint(); // producer
    assertEquals(
        "headers['replyTo']",
        TestUtils.getPropertyValue(endpoint, "handler.delegate.queueNameExpression", Expression.class).getExpressionString());


    endpoint = bindings.get(0).getEndpoint(); // consumer
    verifyConsumer(endpoint);


    properties.put("partitionKeyExpression", "'foo'");
    properties.put("partitionKeyExtractorClass", "foo");
    properties.put("partitionSelectorExpression", "0");
    properties.put("partitionSelectorClass", "foo");
    properties.put("partitionCount", "1");
    properties.put("partitionIndex", "0");
    try {
      bus.bindReplier("dummy", new DirectChannel(), new DirectChannel(), properties);
      fail("Expected exception");
    }
    catch (IllegalArgumentException e) {
      assertThat(e.getMessage(), allOf(
          containsString("RedisMessageBus does not support consumer properties: "),
          containsString("partitionCount"),
          containsString("partitionSelectorExpression"),
          containsString("partitionKeyExtractorClass"),
          containsString("partitionKeyExpression"),
          containsString("partitionSelectorClass")));
      assertThat(e.getMessage(), allOf(containsString("partitionIndex"), containsString("for dummy.")));
    }


    bus.unbindConsumers("props.0");
    bus.unbindProducers("props.0");
    assertEquals(0, bindings.size());
  }

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Examples of org.springframework.xd.dirt.integration.bus.MessageBus

    assertEquals(5.0, TestUtils.getPropertyValue(retry, "backOffPolicy.multiplier"));
  }


  @Test
  public void testRetryFail() {
    MessageBus bus = getMessageBus();
    DirectChannel channel = new DirectChannel();
    bus.bindProducer("retry.0", channel, null);
    Properties props = new Properties();
    props.put("maxAttempts", 2);
    props.put("backOffInitialInterval", 100);
    props.put("backOffMultiplier", "1.0");
    bus.bindConsumer("retry.0", new DirectChannel(), props); // no subscriber
    channel.send(new GenericMessage<String>("foo"));
    RedisTemplate<String, Object> template = createTemplate();
    Object rightPop = template.boundListOps("ERRORS:retry.0").rightPop(5, TimeUnit.SECONDS);
    assertNotNull(rightPop);
    assertThat(new String((byte[]) rightPop), containsString("foo"));

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Examples of org.springframework.xd.dirt.integration.bus.MessageBus

  }


  @Override
  protected void checkBusBound(MessageBus bus) {
    if (bus instanceof RabbitTestMessageBus) {
      MessageBus msgBus = ((RabbitTestMessageBus) bus).getCoreMessageBus();
      assertEquals(4, TestUtils.getPropertyValue(msgBus, "bindings", Collection.class).size());
    }
  }

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Examples of org.springframework.xd.dirt.integration.bus.MessageBus

  }


  @Override
  protected void checkBusUnbound(MessageBus bus) {
    if (bus instanceof RabbitTestMessageBus) {
      MessageBus msgBus = ((RabbitTestMessageBus) bus).getCoreMessageBus();
      assertEquals(0, TestUtils.getPropertyValue(msgBus, "bindings", Collection.class).size());
    }
  }

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