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   /*
    * Copyright 2012 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:
    *
    *   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 io.netty.channel.nio;
  
  import io.netty.channel.Channel;
  import io.netty.channel.DefaultSelectStrategyFactory;
  import io.netty.channel.MultithreadEventLoopGroup;
  import io.netty.channel.SelectStrategyFactory;
  import io.netty.util.concurrent.EventExecutor;
  import io.netty.util.concurrent.RejectedExecutionHandler;
  import io.netty.util.concurrent.RejectedExecutionHandlers;
  
  import java.nio.channels.Selector;
  import java.nio.channels.spi.SelectorProvider;
  import java.util.concurrent.ThreadFactory;
  
  /**
   * {@link MultithreadEventLoopGroup} implementations which is used for NIO {@link Selector} based {@link Channel}s.
   */
  public class NioEventLoopGroup extends MultithreadEventLoopGroup {
  
      /**
       * Create a new instance using the default number of threads, the default {@link ThreadFactory} and
       * the {@link SelectorProvider} which is returned by {@link SelectorProvider#provider()}.
       */
      public NioEventLoopGroup() {
          this(0);
      }
  
      /**
       * Create a new instance using the specified number of threads, {@link ThreadFactory} and the
       * {@link SelectorProvider} which is returned by {@link SelectorProvider#provider()}.
       */
      public NioEventLoopGroup(int nThreads) {
          this(nThreads, null);
      }
  
      /**
       * Create a new instance using the specified number of threads, the given {@link ThreadFactory} and the
       * {@link SelectorProvider} which is returned by {@link SelectorProvider#provider()}.
       */
      public NioEventLoopGroup(int nThreads, ThreadFactory threadFactory) {
          this(nThreads, threadFactory, SelectorProvider.provider());
      }
  
      /**
       * Create a new instance using the specified number of threads, the given {@link ThreadFactory} and the given
       * {@link SelectorProvider}.
       */
      public NioEventLoopGroup(
              int nThreads, ThreadFactory threadFactory, final SelectorProvider selectorProvider) {
          this(nThreads, threadFactory, selectorProvider, DefaultSelectStrategyFactory.INSTANCE);
      }
  
      public NioEventLoopGroup(int nThreads, ThreadFactory threadFactory,
          final SelectorProvider selectorProvider, final SelectStrategyFactory selectStrategyFactory) {
          super(nThreads, threadFactory, selectorProvider, selectStrategyFactory, RejectedExecutionHandlers.reject());
      }
  
      public NioEventLoopGroup(int nThreads, ThreadFactory threadFactory,
                               final SelectorProvider selectorProvider,
                               final SelectStrategyFactory selectStrategyFactory,
                               final RejectedExecutionHandler rejectedExecutionHandler) {
          super(nThreads, threadFactory, selectorProvider, selectStrategyFactory, rejectedExecutionHandler);
      }
  
      /**
       * Sets the percentage of the desired amount of time spent for I/O in the child event loops.  The default value is
       * {@code 50}, which means the event loop will try to spend the same amount of time for I/O as for non-I/O tasks.
       */
      public void setIoRatio(int ioRatio) {
          for (EventExecutor e: children()) {
              ((NioEventLoop) e).setIoRatio(ioRatio);
          }
      }
  
      /**
       * Replaces the current {@link Selector}s of the child event loops with newly created {@link Selector}s to work
       * around the  infamous epoll 100% CPU bug.
       */
      public void rebuildSelectors() {
          for (EventExecutor e: children()) {
              ((NioEventLoop) e).rebuildSelector();
          }
      }
  
     @Override
     protected EventExecutor newChild(ThreadFactory threadFactory, Object... args) throws Exception {
         return new NioEventLoop(this, threadFactory, (SelectorProvider) args[0],
             ((SelectStrategyFactory) args[1]).newSelectStrategy(), (RejectedExecutionHandler) args[2]);
     }
 }