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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 org.jboss.netty.channel.socket.nio;
  
  import org.jboss.netty.channel.socket.Worker;
  import org.jboss.netty.util.ExternalResourceReleasable;
  
  /**
   * This implementation of a {@link WorkerPool} should be used if you plan to share a
   * {@link WorkerPool} between different Factories. You will need to call {@link #destroy()} by your
   * own once you want to release any resources of it.
   *
   *
   */
  public final class ShareableWorkerPool<E extends Worker> implements WorkerPool<E> {
  
      private final WorkerPool<E> wrapped;
  
      public ShareableWorkerPool(WorkerPool<E> wrapped) {
          this.wrapped = wrapped;
      }
  
      public E nextWorker() {
          return wrapped.nextWorker();
      }
  
      public void rebuildSelectors() {
          wrapped.rebuildSelectors();
      }
  
      /**
       * Destroy the {@link ShareableWorkerPool} and release all resources. After this is called its not usable anymore
       */
      public void destroy() {
          wrapped.shutdown();
          if (wrapped instanceof ExternalResourceReleasable) {
              ((ExternalResourceReleasable) wrapped).releaseExternalResources();
          }
      }
  
      public void shutdown() {
          // do nothing
      }
  }