List of syncPublisher() Examples

Examples of syncPublisher()

com.intellij.util.messages.MessageBus.syncPublisher()

Allows to retrieve an interface for publishing messages to the target topic.

Basically, the whole processing looks as follows:

   Messaging clients create new  {@link MessageBusConnection connections} within the target message bus and{@link MessageBusConnection#subscribe(Topic,Object) subscribe} to the target {@link Topic topics}; 
  Every time somebody wants to send a message for particular topic, he or she calls current method and receives object that conforms to the  {@link Topic#getListenerClass() business interface} of the target topic. Every method call on thatobject is dispatched by the messaging infrastructure to the subscribers. {@link Topic#getBroadcastDirection() broadcasting} is performed if necessary as well;

It's also very important to understand message processing strategy in case of nested dispatches. Consider the following situation:

   Subscriber₁ and subscriber₂ are registered for the same topic within the same message bus; 
 Message₁ is sent to that topic within the same message bus;
 Queued messages delivery starts;
 Queued messages delivery ends as there are no messages queued but not dispatched;
 Message₁ is queued for delivery to both subscribers;
 Queued messages delivery starts;
 Message₁ is being delivered to the subscriber₁;
 Subscriber₁ sends message₂ to the same topic within the same bus;
 Queued messages delivery starts;
  Important: subscriber₂ is being notified about all queued but not delivered messages, i.e. its callback is invoked for the message₁; 
 Queued messages delivery ends because all subscribers have been notified on the message₁;
 Message₂ is queued for delivery to both subscribers;
 Queued messages delivery starts;
 Subscriber₁ is notified on message₂
 Subscriber₂ is notified on message₂

Thread-safety. All subscribers are notified sequentially from the calling thread. Memory management. Returned objects are very light-weight and stateless, so, they are cached by the message bus in 'per-topic' manner. That means that caller of this method is not obliged to keep returned reference along with the reference to the message for further publishing. It's enough to keep reference to the message bus only and publish like {@code 'messageBus.syncPublisher(targetTopic).targetMethod()'}. @param topic target topic @param < L> {@link Topic#getListenerClass() business interface} of the target topic @return publisher for target topic

Examples of com.intellij.util.messages.MessageBus.syncPublisher()

    }


    public static <T> T notify(Project project, Topic<T> topic) {
        if (project != null) {
            MessageBus messageBus = project.getMessageBus();
            return messageBus.syncPublisher(topic);
        }
        return null;
    }


    public static void unsubscribe(Object ... handlers) {

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Examples of com.intellij.util.messages.MessageBus.syncPublisher()

      protected void handleBuildEvent(UUID sessionId, CmdlineRemoteProto.Message.BuilderMessage.BuildEvent event) {
        final CmdlineRemoteProto.Message.BuilderMessage.BuildEvent.Type eventType = event.getEventType();
        switch (eventType) {
          case FILES_GENERATED:
            final List<CmdlineRemoteProto.Message.BuilderMessage.BuildEvent.GeneratedFile> generated = event.getGeneratedFilesList();
            final CompilationStatusListener publisher = messageBus.syncPublisher(CompilerTopics.COMPILATION_STATUS);
            Set<String> writtenArtifactOutputPaths = outputToArtifact != null ? new THashSet<String>(FileUtil.PATH_HASHING_STRATEGY) : null;
            for (CmdlineRemoteProto.Message.BuilderMessage.BuildEvent.GeneratedFile generatedFile : generated) {
              final String root = FileUtil.toSystemIndependentName(generatedFile.getOutputRoot());
              final String relativePath = FileUtil.toSystemIndependentName(generatedFile.getRelativePath());
              publisher.fileGenerated(root, relativePath);

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Examples of com.intellij.util.messages.MessageBus.syncPublisher()

            compileContext.putUserDataIfAbsent(COMPILE_SERVER_BUILD_STATUS, status);
            break;
          case CUSTOM_BUILDER_MESSAGE:
            if (event.hasCustomBuilderMessage()) {
              CmdlineRemoteProto.Message.BuilderMessage.BuildEvent.CustomBuilderMessage message = event.getCustomBuilderMessage();
              messageBus.syncPublisher(CustomBuilderMessageHandler.TOPIC).messageReceived(message.getBuilderId(), message.getMessageType(),
                  message.getMessageText());
            }
            break;
        }
      }

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