Package org.springframework.messaging.simp

Class SimpMessagingTemplate

java.lang.Object
org.springframework.messaging.core.AbstractMessageSendingTemplate<String>
org.springframework.messaging.simp.SimpMessagingTemplate
All Implemented Interfaces:
MessageSendingOperations<String>, SimpMessageSendingOperations
public class SimpMessagingTemplate extends AbstractMessageSendingTemplate<String> implements SimpMessageSendingOperations
An implementation of SimpMessageSendingOperations.

Also provides methods for sending messages to a user. See UserDestinationResolver for more on user destinations.

Since:
4.0
Author:
Rossen Stoyanchev

  • Constructor Details

    • SimpMessagingTemplate

      public SimpMessagingTemplate(MessageChannel messageChannel)
      Create a new SimpMessagingTemplate instance.
      Parameters:
      messageChannel - the message channel (never null)

  • Method Details

    • getMessageChannel

      public MessageChannel getMessageChannel()
      Return the configured message channel.

    • setUserDestinationPrefix

      public void setUserDestinationPrefix(String prefix)
      Configure the prefix to use for destinations targeting a specific user.

      The default value is "/user/".

      See Also:

    • getUserDestinationPrefix

      public String getUserDestinationPrefix()
      Return the configured user destination prefix.

    • setSendTimeout

      public void setSendTimeout(long sendTimeout)
      Specify the timeout value to use for send operations (in milliseconds).

    • getSendTimeout

      public long getSendTimeout()
      Return the configured send timeout (in milliseconds).

    • setHeaderInitializer

      public void setHeaderInitializer(@Nullable MessageHeaderInitializer headerInitializer)
      Configure a MessageHeaderInitializer to apply to the headers of all messages created through the SimpMessagingTemplate.

      By default, this property is not set.

    • getHeaderInitializer

      @Nullable public MessageHeaderInitializer getHeaderInitializer()
      Return the configured header initializer.

    • send

      public void send(Message<?> message)
      If the headers of the given message already contain a SimpMessageHeaderAccessor#DESTINATION_HEADER then the message is sent without further changes.

      If a destination header is not already present ,the message is sent to the configured defaultDestination or an exception an IllegalStateException is raised if that isn't configured.

      Specified by:
      send in interface MessageSendingOperations<String>
      Overrides:
      send in class AbstractMessageSendingTemplate<String>
      Parameters:
      message - the message to send (never null)

    • doSend

      protected void doSend(String destination, Message<?> message)
      Specified by:
      doSend in class AbstractMessageSendingTemplate<String>

    • convertAndSendToUser

      public void convertAndSendToUser(String user, String destination, Object payload) throws MessagingException
      Description copied from interface: SimpMessageSendingOperations
      Send a message to the given user.
      Specified by:
      convertAndSendToUser in interface SimpMessageSendingOperations
      Parameters:
      user - the user that should receive the message.
      destination - the destination to send the message to.
      payload - the payload to send
      Throws:
      MessagingException

    • convertAndSendToUser

      public void convertAndSendToUser(String user, String destination, Object payload, @Nullable Map<String,Object> headers) throws MessagingException
      Description copied from interface: SimpMessageSendingOperations
      Send a message to the given user.

      By default headers are interpreted as native headers (e.g. STOMP) and are saved under a special key in the resulting Spring Message. In effect when the message leaves the application, the provided headers are included with it and delivered to the destination (e.g. the STOMP client or broker).

      If the map already contains the key "nativeHeaders" or was prepared with SimpMessageHeaderAccessor then the headers are used directly. A common expected case is providing a content type (to influence the message conversion) and native headers. This may be done as follows: 

       SimpMessageHeaderAccessor accessor = SimpMessageHeaderAccessor.create();
 accessor.setContentType(MimeTypeUtils.TEXT_PLAIN);
 accessor.setNativeHeader("foo", "bar");
 accessor.setLeaveMutable(true);
 MessageHeaders headers = accessor.getMessageHeaders();
 messagingTemplate.convertAndSendToUser(user, destination, payload, headers);

      Note: if the MessageHeaders are mutable as in the above example, implementations of this interface should take notice and update the headers in the same instance (rather than copy or re-create it) and then set it immutable before sending the final message.

      Specified by:
      convertAndSendToUser in interface SimpMessageSendingOperations
      Parameters:
      user - the user that should receive the message (must not be null)
      destination - the destination to send the message to (must not be null)
      payload - the payload to send (may be null)
      headers - the message headers (may be null)
      Throws:
      MessagingException

    • convertAndSendToUser

      public void convertAndSendToUser(String user, String destination, Object payload, @Nullable MessagePostProcessor postProcessor) throws MessagingException
      Description copied from interface: SimpMessageSendingOperations
      Send a message to the given user.
      Specified by:
      convertAndSendToUser in interface SimpMessageSendingOperations
      Parameters:
      user - the user that should receive the message (must not be null)
      destination - the destination to send the message to (must not be null)
      payload - the payload to send (may be null)
      postProcessor - a postProcessor to post-process or modify the created message
      Throws:
      MessagingException

    • convertAndSendToUser

      public void convertAndSendToUser(String user, String destination, Object payload, @Nullable Map<String,Object> headers, @Nullable MessagePostProcessor postProcessor) throws MessagingException
      Description copied from interface: SimpMessageSendingOperations
      Send a message to the given user.

      See MessageSendingOperations.convertAndSend(Object, Object, java.util.Map) for important notes regarding the input headers.

      Specified by:
      convertAndSendToUser in interface SimpMessageSendingOperations
      Parameters:
      user - the user that should receive the message
      destination - the destination to send the message to
      payload - the payload to send
      headers - the message headers
      postProcessor - a postProcessor to post-process or modify the created message
      Throws:
      MessagingException

    • processHeadersToSend

      protected Map<String,Object> processHeadersToSend(@Nullable Map<String,Object> headers)
      Creates a new map and puts the given headers under the key NATIVE_HEADERS.

      Effectively treats the input header map as headers to be sent out to the destination.

      However if the given headers already contain the key NATIVE_HEADERS then the same headers instance is returned without changes.

      Also if the given headers were prepared and obtained with MessageHeaderAccessor.getMessageHeaders() then the same headers instance is also returned without changes.

      Overrides:
      processHeadersToSend in class AbstractMessageSendingTemplate<String>
      Parameters:
      headers - the headers to send (or null if none)
      Returns:
      the actual headers to send (or null if none)