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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.mina.transport.nio;
20  
21  import java.util.concurrent.atomic.AtomicInteger;
22  
23  /**
24   * A fixed size pool of {@link SelectorLoop}.
25   * 
26   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
27   */
28  public class FixedSelectorLoopPool implements SelectorLoopPool {
29      /** the pool of selector loop */
30      private final SelectorLoop[] pool;
31  
32      /** the index of the next selector loop to be served */
33      private final AtomicInteger nextIndex = new AtomicInteger();
34  
35      /**
36       * Create a pool of "size" {@link SelectorLoop}
37       * 
38       * @param size
39       */
40      public FixedSelectorLoopPool(String prefix, final int size) {
41          if (size <= 0) {
42              throw new IllegalArgumentException("We can't create a pool with no Selectorloop in it");
43          }
44  
45          pool = new SelectorLoop[size];
46  
47          for (int i = 0; i < size; i++) {
48              pool[i] = new NioSelectorLoop(prefix + "-I/O", i);
49          }
50      }
51  
52      /**
53       * {@inheritDoc}
54       */
55      @Override
56      public SelectorLoop getSelectorLoop() {
57          return pool[Math.abs(nextIndex.incrementAndGet() % pool.length)];
58      }
59  }