Package org.springframework.messaging.simp

Class SimpAttributes

java.lang.Object
org.springframework.messaging.simp.SimpAttributes
public class SimpAttributes extends Object
A wrapper class for access to attributes associated with a SiMP session (e.g. WebSocket session).
Since:
4.1
Author:
Rossen Stoyanchev

  • Field Details

    • SESSION_MUTEX_NAME

      public static final String SESSION_MUTEX_NAME
      Key for the mutex session attribute.

    • SESSION_COMPLETED_NAME

      public static final String SESSION_COMPLETED_NAME
      Key set after the session is completed.

    • DESTRUCTION_CALLBACK_NAME_PREFIX

      public static final String DESTRUCTION_CALLBACK_NAME_PREFIX
      Prefix for the name of session attributes used to store destruction callbacks.

  • Constructor Details

    • SimpAttributes

      public SimpAttributes(String sessionId, Map<String,Object> attributes)
      Constructor wrapping the given session attributes map.
      Parameters:
      sessionId - the id of the associated session
      attributes - the attributes

  • Method Details

    • getAttribute

      @Nullable public Object getAttribute(String name)
      Return the value for the attribute of the given name, if any.
      Parameters:
      name - the name of the attribute
      Returns:
      the current attribute value, or null if not found

    • setAttribute

      public void setAttribute(String name, Object value)
      Set the value with the given name replacing an existing value (if any).
      Parameters:
      name - the name of the attribute
      value - the value for the attribute

    • removeAttribute

      public void removeAttribute(String name)
      Remove the attribute of the given name, if it exists.

      Also removes the registered destruction callback for the specified attribute, if any. However it does not execute the callback. It is assumed the removed object will continue to be used and destroyed independently at the appropriate time.

      Parameters:
      name - the name of the attribute

    • getAttributeNames

      public String[] getAttributeNames()
      Retrieve the names of all attributes.
      Returns:
      the attribute names as String array, never null

    • registerDestructionCallback

      public void registerDestructionCallback(String name, Runnable callback)
      Register a callback to execute on destruction of the specified attribute. The callback is executed when the session is closed.
      Parameters:
      name - the name of the attribute to register the callback for
      callback - the destruction callback to be executed

    • getSessionId

      public String getSessionId()
      Return an id for the associated session.
      Returns:
      the session id as String (never null)

    • getSessionMutex

      public Object getSessionMutex()
      Expose the object to synchronize on for the underlying session.
      Returns:
      the session mutex to use (never null)

    • isSessionCompleted

      public boolean isSessionCompleted()
      Whether the sessionCompleted() was already invoked.

    • sessionCompleted

      public void sessionCompleted()
      Invoked when the session is completed. Executed completion callbacks.

    • fromMessage

      public static SimpAttributes fromMessage(Message<?> message)
      Extract the SiMP session attributes from the given message and wrap them in a SimpAttributes instance.
      Parameters:
      message - the message to extract session attributes from