Examples of org.springframework.messaging.support.MessageHeaderAccessor

Package org.springframework.messaging.support

Examples of org.springframework.messaging.support.MessageHeaderAccessor

org.springframework.messaging.support.MessageHeaderAccessor

r on in the same thread... MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message); accessor.setHeader("bar", "baz"); accessor.setImmutable();

The method {@link #toMap()} returns a copy of the underlying headers. It canbe used to prepare multiple messages from the same {@code MessageHeaderAccessor}instance:

 MessageHeaderAccessor accessor = new MessageHeaderAccessor(); MessageBuilder builder = MessageBuilder.withPayload("payload").setHeaders(accessor); accessor.setHeader("foo", "bar1"); Message message1 = builder.build(); accessor.setHeader("foo", "bar2"); Message message2 = builder.build(); accessor.setHeader("foo", "bar3"); Message  message3 = builder.build();

However note that with the above style, the header accessor is shared and cannot be re-obtained later on. Alternatively it is also possible to create one {@code MessageHeaderAccessor} per message:

 MessageHeaderAccessor accessor1 = new MessageHeaderAccessor(); accessor.set("foo", "bar1"); Message message1 = MessageBuilder.createMessage("payload", accessor1.getMessageHeaders()); MessageHeaderAccessor accessor2 = new MessageHeaderAccessor(); accessor.set("foo", "bar2"); Message message2 = MessageBuilder.createMessage("payload", accessor2.getMessageHeaders()); MessageHeaderAccessor accessor3 = new MessageHeaderAccessor(); accessor.set("foo", "bar3"); Message message3 = MessageBuilder.createMessage("payload", accessor3.getMessageHeaders());

Note that the above examples aim to demonstrate the general idea of using header accessors. The most likely usage however is through sub-classes. @author Rossen Stoyanchev @author Juergen Hoeller @since 4.0

      }
    }
  }


  private  StompHeaderAccessor getStompHeaderAccessor(Message<?> message) {
    MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, MessageHeaderAccessor.class);
    if (accessor == null) {
      // Shouldn't happen (only broker broadcasts directly to clients)
      throw new IllegalStateException("No header accessor in " + message + ".");
    }
    StompHeaderAccessor stompAccessor;
    if (accessor instanceof StompHeaderAccessor) {
      stompAccessor = (StompHeaderAccessor) accessor;
    }
    else if (accessor instanceof SimpMessageHeaderAccessor) {
      stompAccessor = StompHeaderAccessor.wrap(message);
      if (SimpMessageType.CONNECT_ACK.equals(stompAccessor.getMessageType())) {
        stompAccessor = convertConnectAcktoStompConnected(stompAccessor);
      }
      else if (SimpMessageType.DISCONNECT_ACK.equals(stompAccessor.getMessageType())) {
        stompAccessor = StompHeaderAccessor.create(StompCommand.ERROR);
        stompAccessor.setMessage("Session closed.");
      }
      else if (stompAccessor.getCommand() == null || StompCommand.SEND.equals(stompAccessor.getCommand())) {
        stompAccessor.updateStompCommandAsServerMessage();
      }
    }
    else {
      // Shouldn't happen (only broker broadcasts directly to clients)
      throw new IllegalStateException(
          "Unexpected header accessor type: " + accessor.getClass() + " in " + message + ".");
    }
    return stompAccessor;
  }

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  @Override
  protected final void doSend(MessageChannel channel, Message<?> message) {
    Assert.notNull(channel, "'channel' is required");


    MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, MessageHeaderAccessor.class);
    if (accessor != null && accessor.isMutable()) {
      accessor.setImmutable();
    }


    long timeout = this.sendTimeout;
    boolean sent = (timeout >= 0 ? channel.send(message, timeout) : channel.send(message));

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    assertEquals("bar", message.getHeaders().get("foo"));
  }


  @Test
  public void toMessageWithPayloadAndMutableHeaders() {
    MessageHeaderAccessor accessor = new MessageHeaderAccessor();
    accessor.setHeader("foo", "bar");
    accessor.setLeaveMutable(true);
    MessageHeaders headers = accessor.getMessageHeaders();


    Message<?> message = this.converter.toMessage("payload", headers);


    assertEquals("payload", message.getPayload());
    assertSame(headers, message.getHeaders());

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    }
  }


  @Test
  public void convertAndSendWithSimpMessageHeaders() {
    MessageHeaderAccessor accessor = new MessageHeaderAccessor();
    accessor.setHeader("key", "value");
    accessor.setLeaveMutable(true);
    MessageHeaders headers = accessor.getMessageHeaders();


    this.template.convertAndSend("channel", "data", headers);
    List<Message<byte[]>> messages = this.messageChannel.getMessages();
    Message<byte[]> message = messages.get(0);


    assertSame(headers, message.getHeaders());
    assertFalse(accessor.isMutable());
  }

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    assertEquals("payload", this.template.message.getPayload());
  }


  @Test
  public void convertAndSendPayloadAndMutableHeadersToDestination() {
    MessageHeaderAccessor accessor = new MessageHeaderAccessor();
    accessor.setHeader("foo", "bar");
    accessor.setLeaveMutable(true);
    MessageHeaders messageHeaders = accessor.getMessageHeaders();


    this.template.setMessageConverter(new StringMessageConverter());
    this.template.convertAndSend("somewhere", "payload", messageHeaders);


    MessageHeaders actual = this.template.message.getHeaders();

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    this.messagingTemplate.doSend("/queue/foo-user123", message);


    List<Message<byte[]>> messages = this.messageChannel.getMessages();
    Message<byte[]> sentMessage = messages.get(0);


    MessageHeaderAccessor sentAccessor = MessageHeaderAccessor.getAccessor(sentMessage, MessageHeaderAccessor.class);
    assertEquals(StompHeaderAccessor.class, sentAccessor.getClass());
    assertEquals("/queue/foo-user123", ((StompHeaderAccessor) sentAccessor).getDestination());
  }

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    }


    StompHeaderAccessor stompAccessor;
    StompCommand command;


    MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, MessageHeaderAccessor.class);
    if (accessor == null) {
      throw new IllegalStateException(
          "No header accessor (not using the SimpMessagingTemplate?): " + message);
    }
    else if (accessor instanceof StompHeaderAccessor) {
      stompAccessor = (StompHeaderAccessor) accessor;
      command = stompAccessor.getCommand();
    }
    else if (accessor instanceof SimpMessageHeaderAccessor) {
      stompAccessor = StompHeaderAccessor.wrap(message);
      command = stompAccessor.getCommand();
      if (command == null) {
        command = stompAccessor.updateStompCommandAsClientMessage();
      }
    }
    else {
      throw new IllegalStateException(
          "Unexpected header accessor type " + accessor.getClass() + " in " + message);
    }


    if (sessionId == null) {
      if (!SimpMessageType.MESSAGE.equals(stompAccessor.getMessageType())) {
        if (logger.isErrorEnabled()) {

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    }
    String lookupDestination = getLookupDestination(destination);
    if (lookupDestination == null) {
      return;
    }
    MessageHeaderAccessor headerAccessor = MessageHeaderAccessor.getMutableAccessor(message);
    headerAccessor.setHeader(DestinationPatternsMessageCondition.LOOKUP_DESTINATION_HEADER, lookupDestination);
    headerAccessor.setLeaveMutable(true);
    message = MessageBuilder.createMessage(message.getPayload(), headerAccessor.getMessageHeaders());


    if (logger.isDebugEnabled()) {
      logger.debug("Searching methods to handle " + headerAccessor.getShortLogMessage(message.getPayload()));
    }


    handleMessageInternal(message, lookupDestination);
    headerAccessor.setImmutable();
  }

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    payload = convertToInternal(payload, headers);
    MimeType mimeType = getDefaultContentType(payload);


    if (headers != null) {
      MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(headers, MessageHeaderAccessor.class);
      if (accessor != null && accessor.isMutable()) {
        accessor.setHeaderIfAbsent(MessageHeaders.CONTENT_TYPE, mimeType);
        return MessageBuilder.createMessage(payload, accessor.getMessageHeaders());
      }
    }


    MessageBuilder<?> builder = MessageBuilder.withPayload(payload);
    if (headers != null) {

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  public Message<?> toMessage(Object payload, MessageHeaders headers) {
    if (payload == null) {
      return null;
    }
    if (headers != null) {
      MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(headers, MessageHeaderAccessor.class);
      if (accessor != null && accessor.isMutable()) {
        return MessageBuilder.createMessage(payload, accessor.getMessageHeaders());
      }
    }
    return MessageBuilder.withPayload(payload).copyHeaders(headers).build();
  }

View Full Code Here

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Related Classes of org.springframework.messaging.support.MessageHeaderAccessor

org.springframework.messaging.converter.AbstractMessageConverter

org.springframework.messaging.converter.SimpleMessageConverter

org.springframework.messaging.converter.SimpleMessageConverterTests

org.springframework.messaging.core.GenericMessagingTemplate

org.springframework.messaging.core.GenericMessagingTemplateTests

org.springframework.messaging.core.MessageSendingTemplateTests

org.springframework.messaging.handler.annotation.support.HeadersMethodArgumentResolver

org.springframework.messaging.handler.annotation.support.HeadersMethodArgumentResolverTests

org.springframework.messaging.handler.invocation.AbstractMethodMessageHandler

org.springframework.messaging.MessageHeaders

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