it.tidalwave.actor.impl.CollaborationAwareMessageBusAdapter Maven / Gradle / Ivy

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An experimental module which provides an implementation of an actor-based framework.
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/*
 * *************************************************************************************************************************************************************
 *
 * TheseFoolishThings: Miscellaneous utilities
 * http://tidalwave.it/projects/thesefoolishthings
 *
 * Copyright (C) 2009 - 2025 by Tidalwave s.a.s. (http://tidalwave.it)
 *
 * *************************************************************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
 * CONDITIONS OF ANY KIND, either express or implied.  See the License for the specific language governing permissions and limitations under the License.
 *
 * *************************************************************************************************************************************************************
 *
 * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
 * git clone https://github.com/tidalwave-it/thesefoolishthings-src
 *
 * *************************************************************************************************************************************************************
 */
package it.tidalwave.actor.impl;

import java.lang.reflect.Method;
import jakarta.annotation.Nonnull;
import javax.inject.Provider;
import java.util.ArrayList;
import java.util.List;
import it.tidalwave.actor.CollaborationCompletedMessage;
import it.tidalwave.actor.CollaborationStartedMessage;
import it.tidalwave.actor.annotation.OriginatedBy;
import it.tidalwave.actor.spi.ActorActivatorStats;
import it.tidalwave.actor.spi.CollaborationAwareMessageBus;
import it.tidalwave.messagebus.MessageBus;
import it.tidalwave.messagebus.annotation.ListensTo;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import static it.tidalwave.messagebus.spi.ReflectionUtils.*;

/***************************************************************************************************************************************************************
 *
 * @author  Fabrizio Giudici
 *
 **************************************************************************************************************************************************************/
@RequiredArgsConstructor @Slf4j
public class CollaborationAwareMessageBusAdapter implements MethodProcessor
  {
    @Nonnull
    private final Object owner;

    @Nonnull
    private final ExecutorWithPriority executor;

    @Nonnull
    private final ActorActivatorStats stats;

    private final List> messageBusListeners = new ArrayList<>();

    private final Provider messageBus =
            Locator.createProviderFor(CollaborationAwareMessageBus.class);

    /***********************************************************************************************************************************************************
     *
     **********************************************************************************************************************************************************/
    @Override @Nonnull
    public FilterResult filter (@Nonnull final Class clazz)
      {
        return FilterResult.ACCEPT; // TODO: should filter with @Actor?
      }

    /***********************************************************************************************************************************************************
     *
     **********************************************************************************************************************************************************/
    @Override
    public void process (@Nonnull final Method method)
      {
        final var parameterAnnotations = method.getParameterAnnotations();

        if ((parameterAnnotations.length == 1) && containsAnnotation(parameterAnnotations[0], ListensTo.class))
          {
            registerMessageListener(method);
          }
        else if ((parameterAnnotations.length == 2) && containsAnnotation(parameterAnnotations[0], ListensTo.class)
                                                    && containsAnnotation(parameterAnnotations[1], OriginatedBy.class))
          {
            registerCollaborationListener(method);
          }
      }

    /***********************************************************************************************************************************************************
     *
     **********************************************************************************************************************************************************/
    public void unsubscribe()
      {
        for (final var listener : messageBusListeners)
          {
            messageBus.get().unsubscribe(listener);
          }
      }

    /***********************************************************************************************************************************************************
     *
     **********************************************************************************************************************************************************/
    private  void registerMessageListener (@Nonnull final Method method)
      {
        log.info("registerMessageListener({})", method);

        final var topic = (Class)method.getParameterTypes()[0];
        addListener(method, new MessageListenerAdapter<>(owner, method, executor, stats), topic);
      }

    /***********************************************************************************************************************************************************
     *
     **********************************************************************************************************************************************************/
    private  void registerCollaborationListener (@Nonnull final Method method)
      {
        log.info("registerCollaborationListener({})", method);
        final var collaborationMessageType = method.getParameterTypes()[0];
        final var messageType = method.getParameterTypes()[1];

        final MessageBus.Listener messageListener = collaborationMessageType.equals(CollaborationStartedMessage.class)
            ? new CollaborationMessageListenerAdapter(owner, method, executor, messageType, stats)
            : new CollaborationMessageListenerAdapter(owner, method, executor, messageType, stats);
        addListener(method, messageListener, collaborationMessageType);
      }

    /***********************************************************************************************************************************************************
     *
     **********************************************************************************************************************************************************/
    private  void addListener (@Nonnull final Method method,
                                  @Nonnull final MessageBus.Listener messageListener,
                                  @Nonnull final Class topic) throws SecurityException
      {
        method.setAccessible(true);
        messageBusListeners.add(messageListener);
        messageBus.get().subscribe(topic, messageListener);
      }
  }