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 }