content: /*
   * Copyright (C) 2012-2016 Markus Junginger, greenrobot (http://greenrobot.org)
   *
   * 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.
   */
  package org.greenrobot.eventbus;
  
  /**
   * Posts events in background.
   *
   * @author Markus
   */
  class AsyncPoster implements Runnable, Poster {
  
    private final PendingPostQueue queue;
    private final EventBus eventBus;
  
    AsyncPoster(EventBus eventBus) {
      this.eventBus = eventBus;
      queue = new PendingPostQueue();
    }
  
    public void enqueue(Subscription subscription, Object event) {
      PendingPost pendingPost = PendingPost.obtainPendingPost(subscription, event);
      queue.enqueue(pendingPost);
      eventBus.getExecutorService().execute(this);
    }
  
    @Override
    public void run() {
      PendingPost pendingPost = queue.poll();
      if (pendingPost == null) {
        throw new IllegalStateException("No pending post available");
      }
      eventBus.invokeSubscriber(pendingPost);
    }
  }
  