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/*
 * Copyright (C) 2007 The Guava Authors
 *
 * 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 com.google.common.eventbus;

import com.google.common.annotations.Beta;

import java.util.concurrent.Executor;

/**
 * An {@link EventBus} that takes the Executor of your choice and uses it to
 * dispatch events, allowing dispatch to occur asynchronously.
 *
 * @author Cliff Biffle
 * @since 10.0
 */
@Beta
public class AsyncEventBus extends EventBus {

  /**
   * Creates a new AsyncEventBus that will use {@code executor} to dispatch
   * events.  Assigns {@code identifier} as the bus's name for logging purposes.
   *
   * @param identifier short name for the bus, for logging purposes.
   * @param executor   Executor to use to dispatch events. It is the caller's
   *        responsibility to shut down the executor after the last event has
   *        been posted to this event bus.
   */
  public AsyncEventBus(String identifier, Executor executor) {
    super(identifier, executor, Dispatcher.legacyAsync(), LoggingHandler.INSTANCE);
  }

  /**
   * Creates a new AsyncEventBus that will use {@code executor} to dispatch
   * events.
   *
   * @param executor Executor to use to dispatch events. It is the caller's
   *        responsibility to shut down the executor after the last event has
   *        been posted to this event bus.
   * @param subscriberExceptionHandler Handler used to handle exceptions thrown from subscribers.
   *    See {@link SubscriberExceptionHandler} for more information.
   * @since 16.0
   */
  public AsyncEventBus(Executor executor, SubscriberExceptionHandler subscriberExceptionHandler) {
    super("default", executor, Dispatcher.legacyAsync(), subscriberExceptionHandler);
  }

  /**
   * Creates a new AsyncEventBus that will use {@code executor} to dispatch
   * events.
   *
   * @param executor Executor to use to dispatch events. It is the caller's
   *        responsibility to shut down the executor after the last event has
   *        been posted to this event bus.
   */
  public AsyncEventBus(Executor executor) {
    super("default", executor, Dispatcher.legacyAsync(), LoggingHandler.INSTANCE);
  }
}