/*
    * Copyright 2016 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.kqueue;
  
  import io.netty.channel.Channel;
  import io.netty.channel.DefaultSelectStrategyFactory;
  import io.netty.channel.EventLoopTaskQueueFactory;
  import io.netty.channel.IoEventLoopGroup;
  import io.netty.channel.IoEventLoop;
  import io.netty.channel.IoHandler;
  import io.netty.channel.MultiThreadIoEventLoopGroup;
  import io.netty.channel.SelectStrategyFactory;
  import io.netty.channel.SingleThreadEventLoop;
  import io.netty.channel.SingleThreadIoEventLoop;
  import io.netty.util.concurrent.EventExecutorChooserFactory;
  import io.netty.util.concurrent.RejectedExecutionHandler;
  import io.netty.util.concurrent.RejectedExecutionHandlers;
  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 MultiThreadIoEventLoopGroup} with {@link KQueueIoHandler}.
   */
  @Deprecated
  public final class KQueueEventLoopGroup extends MultiThreadIoEventLoopGroup {
  
      // This does not use static by design to ensure the class can be loaded and only do the check when its actually
      // instanced.
      {
          // Ensure JNI is initialized by the time this class is loaded by this time!
          KQueue.ensureAvailability();
      }
  
      private static final InternalLogger LOGGER = InternalLoggerFactory.getInstance(KQueueEventLoopGroup.class);
  
      /**
       * Create a new instance using the default number of threads and the default {@link ThreadFactory}.
       */
      public KQueueEventLoopGroup() {
          this(0);
      }
  
      /**
       * Create a new instance using the specified number of threads and the default {@link ThreadFactory}.
       */
      public KQueueEventLoopGroup(int nThreads) {
          this(nThreads, (ThreadFactory) null);
      }
  
      /**
       * Create a new instance using the default number of threads and the given {@link ThreadFactory}.
       */
      @SuppressWarnings("deprecation")
      public KQueueEventLoopGroup(ThreadFactory threadFactory) {
          this(0, threadFactory, 0);
      }
  
      /**
       * Create a new instance using the specified number of threads and the default {@link ThreadFactory}.
       */
      @SuppressWarnings("deprecation")
      public KQueueEventLoopGroup(int nThreads, SelectStrategyFactory selectStrategyFactory) {
          this(nThreads, (ThreadFactory) null, selectStrategyFactory);
      }
  
      /**
       * Create a new instance using the specified number of threads and the given {@link ThreadFactory}.
       */
      @SuppressWarnings("deprecation")
      public KQueueEventLoopGroup(int nThreads, ThreadFactory threadFactory) {
          this(nThreads, threadFactory, 0);
      }
  
      public KQueueEventLoopGroup(int nThreads, Executor executor) {
          this(nThreads, executor, DefaultSelectStrategyFactory.INSTANCE);
      }
  
      /**
       * Create a new instance using the specified number of threads and the given {@link ThreadFactory}.
      */
     @SuppressWarnings("deprecation")
     public KQueueEventLoopGroup(int nThreads, ThreadFactory threadFactory,
                                 SelectStrategyFactory selectStrategyFactory) {
         this(nThreads, threadFactory, 0, selectStrategyFactory);
     }
 
     /**
      * Create a new instance using the specified number of threads, the given {@link ThreadFactory} and the given
      * maximal amount of epoll events to handle per epollWait(...).
      *
      * @deprecated  Use {@link #KQueueEventLoopGroup(int)} or {@link #KQueueEventLoopGroup(int, ThreadFactory)}
      */
     @Deprecated
     public KQueueEventLoopGroup(int nThreads, ThreadFactory threadFactory, int maxEventsAtOnce) {
         this(nThreads, threadFactory, maxEventsAtOnce, DefaultSelectStrategyFactory.INSTANCE);
     }
 
     /**
      * Create a new instance using the specified number of threads, the given {@link ThreadFactory} and the given
      * maximal amount of epoll events to handle per epollWait(...).
      *
      * @deprecated  Use {@link #KQueueEventLoopGroup(int)}, {@link #KQueueEventLoopGroup(int, ThreadFactory)}, or
      * {@link #KQueueEventLoopGroup(int, SelectStrategyFactory)}
      */
     @Deprecated
     public KQueueEventLoopGroup(int nThreads, ThreadFactory threadFactory, int maxEventsAtOnce,
                                SelectStrategyFactory selectStrategyFactory) {
         super(nThreads, threadFactory, KQueueIoHandler.newFactory(maxEventsAtOnce, selectStrategyFactory),
                 RejectedExecutionHandlers.reject());
     }
 
     public KQueueEventLoopGroup(int nThreads, Executor executor, SelectStrategyFactory selectStrategyFactory) {
         super(nThreads, executor, KQueueIoHandler.newFactory(0, selectStrategyFactory),
                 RejectedExecutionHandlers.reject());
     }
 
     public KQueueEventLoopGroup(int nThreads, Executor executor, EventExecutorChooserFactory chooserFactory,
                                SelectStrategyFactory selectStrategyFactory) {
         super(nThreads, executor, KQueueIoHandler.newFactory(0, selectStrategyFactory),
                 chooserFactory, RejectedExecutionHandlers.reject());
     }
 
     public KQueueEventLoopGroup(int nThreads, Executor executor, EventExecutorChooserFactory chooserFactory,
                                SelectStrategyFactory selectStrategyFactory,
                                RejectedExecutionHandler rejectedExecutionHandler) {
         super(nThreads, executor,  KQueueIoHandler.newFactory(0, selectStrategyFactory), chooserFactory,
                 rejectedExecutionHandler);
     }
 
     public KQueueEventLoopGroup(int nThreads, Executor executor, EventExecutorChooserFactory chooserFactory,
                                 SelectStrategyFactory selectStrategyFactory,
                                 RejectedExecutionHandler rejectedExecutionHandler,
                                 EventLoopTaskQueueFactory queueFactory) {
         super(nThreads, executor, KQueueIoHandler.newFactory(0, selectStrategyFactory), chooserFactory,
                 rejectedExecutionHandler, queueFactory);
     }
 
     /**
      * @param nThreads the number of threads that will be used by this instance.
      * @param executor the Executor to use, or {@code null} if default one should be used.
      * @param chooserFactory the {@link EventExecutorChooserFactory} to use.
      * @param selectStrategyFactory the {@link SelectStrategyFactory} to use.
      * @param rejectedExecutionHandler the {@link RejectedExecutionHandler} to use.
      * @param taskQueueFactory the {@link EventLoopTaskQueueFactory} to use for
      *                         {@link SingleThreadEventLoop#execute(Runnable)},
      *                         or {@code null} if default one should be used.
      * @param tailTaskQueueFactory the {@link EventLoopTaskQueueFactory} to use for
      *                             {@link SingleThreadEventLoop#executeAfterEventLoopIteration(Runnable)},
      *                             or {@code null} if default one should be used.
      */
     public KQueueEventLoopGroup(int nThreads, Executor executor, EventExecutorChooserFactory chooserFactory,
                                SelectStrategyFactory selectStrategyFactory,
                                RejectedExecutionHandler rejectedExecutionHandler,
                                EventLoopTaskQueueFactory taskQueueFactory,
                                EventLoopTaskQueueFactory tailTaskQueueFactory) {
         super(nThreads, executor, KQueueIoHandler.newFactory(0, selectStrategyFactory), chooserFactory,
                 rejectedExecutionHandler, taskQueueFactory, tailTaskQueueFactory);
     }
 
     /**
      * This method is a no-op.
      *
      * @deprecated
      */
     @Deprecated
     public void setIoRatio(int ioRatio) {
         LOGGER.debug("EpollEventLoopGroup.setIoRatio(int) logic was removed, this is a no-op");
     }
 
     @Override
     protected IoEventLoop newChild(Executor executor, IoHandler handler, Object... args) {
         RejectedExecutionHandler rejectedExecutionHandler = null;
         EventLoopTaskQueueFactory taskQueueFactory = null;
         EventLoopTaskQueueFactory tailTaskQueueFactory = null;
         int argsLength = args.length;
         if (argsLength > 0) {
             rejectedExecutionHandler = (RejectedExecutionHandler) args[0];
         }
         if (argsLength > 1) {
             taskQueueFactory = (EventLoopTaskQueueFactory) args[2];
         }
         if (argsLength > 2) {
             tailTaskQueueFactory = (EventLoopTaskQueueFactory) args[1];
         }
         return new KQueueEventLoop(this, executor, handler,
                 KQueueEventLoop.newTaskQueue(taskQueueFactory),
                 KQueueEventLoop.newTaskQueue(tailTaskQueueFactory),
                 rejectedExecutionHandler);
     }
 
     private static final class KQueueEventLoop extends SingleThreadIoEventLoop {
         KQueueEventLoop(IoEventLoopGroup parent, Executor executor, IoHandler ioHandler,
                         Queue<Runnable> taskQueue, Queue<Runnable> tailTaskQueue,
                         RejectedExecutionHandler rejectedExecutionHandler) {
             super(parent, executor, ioHandler, taskQueue, tailTaskQueue, rejectedExecutionHandler);
         }
 
         static Queue<Runnable> newTaskQueue(
                 EventLoopTaskQueueFactory queueFactory) {
             if (queueFactory == null) {
                 return newTaskQueue0(DEFAULT_MAX_PENDING_TASKS);
             }
             return queueFactory.newTaskQueue(DEFAULT_MAX_PENDING_TASKS);
         }
 
         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() {
             assert inEventLoop();
             return ((KQueueIoHandler) ioHandler()).numRegisteredChannels();
         }
 
         @Override
         public Iterator<Channel> registeredChannelsIterator() {
             assert inEventLoop();
             return ((KQueueIoHandler) ioHandler()).registeredChannelsList().iterator();
         }
     }
 }