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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package org.jboss.netty.channel.socket.nio;
17  
18  import org.jboss.netty.channel.socket.Worker;
19  import org.jboss.netty.util.ExternalResourceReleasable;
20  
21  /**
22   * This implementation of a {@link WorkerPool} should be used if you plan to share a
23   * {@link WorkerPool} between different Factories. You will need to call {@link #destroy()} by your
24   * own once you want to release any resources of it.
25   *
26   *
27   */
28  public final class ShareableWorkerPool<E extends Worker> implements WorkerPool<E> {
29  
30      private final WorkerPool<E> wrapped;
31  
32      public ShareableWorkerPool(WorkerPool<E> wrapped) {
33          this.wrapped = wrapped;
34      }
35  
36      public E nextWorker() {
37          return wrapped.nextWorker();
38      }
39  
40      public void rebuildSelectors() {
41          wrapped.rebuildSelectors();
42      }
43  
44      /**
45       * Destroy the {@link ShareableWorkerPool} and release all resources. After this is called its not usable anymore
46       */
47      public void destroy() {
48          wrapped.shutdown();
49          if (wrapped instanceof ExternalResourceReleasable) {
50              ((ExternalResourceReleasable) wrapped).releaseExternalResources();
51          }
52      }
53  
54      public void shutdown() {
55          // do nothing
56      }
57  }