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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  }