Examples of org.springframework.messaging.support.MessageHeaderAccessor$MutableMessageHeaders

Package org.springframework.messaging.support

Examples of org.springframework.messaging.support.MessageHeaderAccessor$MutableMessageHeaders

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


    String matchedPattern = mapping.getDestinationConditions().getPatterns().iterator().next();
    Map<String, String> vars = getPathMatcher().extractUriTemplateVariables(matchedPattern, lookupDestination);


    if (!CollectionUtils.isEmpty(vars)) {
      MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, MessageHeaderAccessor.class);
      Assert.state(accessor != null && accessor.isMutable());
      accessor.setHeader(DestinationVariableMethodArgumentResolver.DESTINATION_TEMPLATE_VARIABLES_HEADER, vars);
    }


    try {
      SimpAttributesContextHolder.setAttributesFromMessage(message);
      super.handleMatch(mapping, handlerMethod, lookupDestination, message);

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    if (Map.class.isAssignableFrom(paramType)) {
      return message.getHeaders();
    }
    else if (MessageHeaderAccessor.class.equals(paramType)) {
      MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, MessageHeaderAccessor.class);
      return (accessor != null ? accessor : new MessageHeaderAccessor(message));
    }
    else if (MessageHeaderAccessor.class.isAssignableFrom(paramType)) {
      MessageHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(message, MessageHeaderAccessor.class);
      if (accessor != null && paramType.isAssignableFrom(accessor.getClass())) {
        return accessor;
      }
      else {
        Method method = ReflectionUtils.findMethod(paramType, "wrap", Message.class);
        Assert.notNull(method, "Cannot create accessor of type " + paramType + " for message " +  message);

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  @Test
  public void resolveArgumentMessageHeaderAccessor() throws Exception {
    Object resolved = this.resolver.resolveArgument(this.paramMessageHeaderAccessor, this.message);


    assertTrue(resolved instanceof MessageHeaderAccessor);
    MessageHeaderAccessor headers = (MessageHeaderAccessor) resolved;
    assertEquals("bar", headers.getHeader("foo"));
  }

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org.springframework.messaging.core.GenericMessagingTemplateTests

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