/*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project licenses this file to you 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:
    *
    *   https://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 io.netty.channel.epoll;
  
  import io.netty.channel.Channel;
  import io.netty.channel.EventLoopTaskQueueFactory;
  import io.netty.channel.IoEventLoopGroup;
  import io.netty.channel.IoHandler;
  import io.netty.channel.SingleThreadIoEventLoop;
  import io.netty.util.concurrent.RejectedExecutionHandler;
  import io.netty.util.internal.PlatformDependent;
  import io.netty.util.internal.logging.InternalLogger;
  import io.netty.util.internal.logging.InternalLoggerFactory;
  
  import java.util.Iterator;
  import java.util.Queue;
  import java.util.concurrent.Executor;
  import java.util.concurrent.ThreadFactory;
  
  /**
   * @deprecated Use {@link SingleThreadIoEventLoop} with {@link EpollIoHandler}
   */
  @Deprecated
  public class EpollEventLoop extends SingleThreadIoEventLoop {
  
      private static final InternalLogger LOGGER = InternalLoggerFactory.getInstance(EpollEventLoop.class);
  
      EpollEventLoop(IoEventLoopGroup parent, ThreadFactory threadFactory, IoHandler ioHandler) {
          super(parent, threadFactory, ioHandler);
      }
  
      EpollEventLoop(IoEventLoopGroup parent, Executor executor, IoHandler ioHandler) {
          super(parent, executor, ioHandler);
      }
  
      EpollEventLoop(IoEventLoopGroup parent, Executor executor, IoHandler ioHandler,
                     EventLoopTaskQueueFactory taskQueueFactory,
                     EventLoopTaskQueueFactory tailTaskQueueFactory,
                     RejectedExecutionHandler rejectedExecutionHandler) {
          super(parent, executor, ioHandler, newTaskQueue(taskQueueFactory), newTaskQueue(tailTaskQueueFactory),
                  rejectedExecutionHandler);
      }
  
      private static Queue<Runnable> newTaskQueue(
              EventLoopTaskQueueFactory queueFactory) {
          if (queueFactory == null) {
              return newTaskQueue0(DEFAULT_MAX_PENDING_TASKS);
          }
          return queueFactory.newTaskQueue(DEFAULT_MAX_PENDING_TASKS);
      }
  
      @Override
      protected Queue<Runnable> newTaskQueue(int maxPendingTasks) {
          return newTaskQueue0(maxPendingTasks);
      }
  
      private static Queue<Runnable> newTaskQueue0(int maxPendingTasks) {
          // This event loop never calls takeTask()
          return maxPendingTasks == Integer.MAX_VALUE ? PlatformDependent.<Runnable>newMpscQueue()
                  : PlatformDependent.<Runnable>newMpscQueue(maxPendingTasks);
      }
  
      @Override
      public int registeredChannels() {
          return ((EpollIoHandler) ioHandler()).numRegisteredChannels();
      }
  
      @Override
      public Iterator<Channel> registeredChannelsIterator() {
          return ((EpollIoHandler) ioHandler()).registeredChannelsList().iterator();
      }
  
      /**
       * Returns 0.
       */
      public int getIoRatio() {
          return 0;
      }
  
      /**
       * This method is a no-op.
       *
       * @deprecated
       */
      @Deprecated
      public void setIoRatio(int ioRatio) {
         LOGGER.debug("EpollEventLoop.setIoRatio(int) logic was removed, this is a no-op");
     }
 }