| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html lang="en"> |
| <head> |
| <title>Source code</title> |
| <link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style"> |
| </head> |
| <body> |
| <div class="sourceContainer"> |
| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing,<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * software distributed under the License is distributed on an<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * KIND, either express or implied. See the License for the<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * specific language governing permissions and limitations<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> *<a name="line.18"></a> |
| <span class="sourceLineNo">019</span> */<a name="line.19"></a> |
| <span class="sourceLineNo">020</span>package org.apache.mina.util.byteaccess;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span><a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.ArrayList;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.Stack;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span><a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.mina.core.buffer.IoBuffer;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span><a name="line.26"></a> |
| <span class="sourceLineNo">027</span>/**<a name="line.27"></a> |
| <span class="sourceLineNo">028</span> * Creates <code>ByteArray</code>s, using a pool to reduce allocation where possible.<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> *<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * WARNING: This code has never been run!<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * <a name="line.31"></a> |
| <span class="sourceLineNo">032</span> *<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * @author <a href="http://mina.apache.org">Apache MINA Project</a><a name="line.33"></a> |
| <span class="sourceLineNo">034</span> */<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>public class ByteArrayPool implements ByteArrayFactory {<a name="line.35"></a> |
| <span class="sourceLineNo">036</span><a name="line.36"></a> |
| <span class="sourceLineNo">037</span> private final int MAX_BITS = 32;<a name="line.37"></a> |
| <span class="sourceLineNo">038</span><a name="line.38"></a> |
| <span class="sourceLineNo">039</span> private boolean freed;<a name="line.39"></a> |
| <span class="sourceLineNo">040</span><a name="line.40"></a> |
| <span class="sourceLineNo">041</span> private final boolean direct;<a name="line.41"></a> |
| <span class="sourceLineNo">042</span><a name="line.42"></a> |
| <span class="sourceLineNo">043</span> private ArrayList<Stack<DirectBufferByteArray>> freeBuffers;<a name="line.43"></a> |
| <span class="sourceLineNo">044</span><a name="line.44"></a> |
| <span class="sourceLineNo">045</span> private int freeBufferCount = 0;<a name="line.45"></a> |
| <span class="sourceLineNo">046</span><a name="line.46"></a> |
| <span class="sourceLineNo">047</span> private long freeMemory = 0;<a name="line.47"></a> |
| <span class="sourceLineNo">048</span><a name="line.48"></a> |
| <span class="sourceLineNo">049</span> private final int maxFreeBuffers;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span><a name="line.50"></a> |
| <span class="sourceLineNo">051</span> private final int maxFreeMemory;<a name="line.51"></a> |
| <span class="sourceLineNo">052</span><a name="line.52"></a> |
| <span class="sourceLineNo">053</span> /**<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * Creates a new instance of ByteArrayPool.<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> *<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> * @param direct<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> * If we should use direct buffers<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> * @param maxFreeBuffers<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * The maximum number of free buffers<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * @param maxFreeMemory<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> * The maximum amount of free memory allowed<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> */<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> public ByteArrayPool(boolean direct, int maxFreeBuffers, int maxFreeMemory) {<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> this.direct = direct;<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> freeBuffers = new ArrayList<Stack<DirectBufferByteArray>>();<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> for (int i = 0; i < MAX_BITS; i++) {<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> freeBuffers.add(new Stack<DirectBufferByteArray>());<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> }<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> this.maxFreeBuffers = maxFreeBuffers;<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> this.maxFreeMemory = maxFreeMemory;<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> this.freed = false;<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> }<a name="line.72"></a> |
| <span class="sourceLineNo">073</span><a name="line.73"></a> |
| <span class="sourceLineNo">074</span> /**<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> * Creates a new instance of a {@link ByteArray}<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> * <a name="line.76"></a> |
| <span class="sourceLineNo">077</span> * @param size<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> * The size of the array to build<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> */<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> public ByteArray create(int size) {<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> if (size < 1) {<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> throw new IllegalArgumentException("Buffer size must be at least 1: " + size);<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> }<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> int bits = bits(size);<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> synchronized (this) {<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> if (!freeBuffers.get(bits).isEmpty()) {<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> DirectBufferByteArray ba = freeBuffers.get(bits).pop();<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> ba.setFreed(false);<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> ba.getSingleIoBuffer().limit(size);<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> return ba;<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> }<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> }<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> IoBuffer bb;<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> int bbSize = 1 << bits;<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> bb = IoBuffer.allocate(bbSize, direct);<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> bb.limit(size);<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> DirectBufferByteArray ba = new DirectBufferByteArray(bb);<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> ba.setFreed(false);<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> return ba;<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> }<a name="line.100"></a> |
| <span class="sourceLineNo">101</span><a name="line.101"></a> |
| <span class="sourceLineNo">102</span> private int bits(int index) {<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> int bits = 0;<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> while (1 << bits < index) {<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> bits++;<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> }<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> return bits;<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> }<a name="line.108"></a> |
| <span class="sourceLineNo">109</span><a name="line.109"></a> |
| <span class="sourceLineNo">110</span> /**<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> * Frees the buffers<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> *<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> */<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> public void free() {<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> synchronized (this) {<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> if (freed) {<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> throw new IllegalStateException("Already freed.");<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> }<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> freed = true;<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> freeBuffers.clear();<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> freeBuffers = null;<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> }<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> }<a name="line.123"></a> |
| <span class="sourceLineNo">124</span><a name="line.124"></a> |
| <span class="sourceLineNo">125</span> private class DirectBufferByteArray extends BufferByteArray {<a name="line.125"></a> |
| <span class="sourceLineNo">126</span><a name="line.126"></a> |
| <span class="sourceLineNo">127</span> private boolean freed;<a name="line.127"></a> |
| <span class="sourceLineNo">128</span><a name="line.128"></a> |
| <span class="sourceLineNo">129</span> public DirectBufferByteArray(IoBuffer bb) {<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> super(bb);<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> }<a name="line.131"></a> |
| <span class="sourceLineNo">132</span><a name="line.132"></a> |
| <span class="sourceLineNo">133</span> public void setFreed(boolean freed) {<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> this.freed = freed;<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> }<a name="line.135"></a> |
| <span class="sourceLineNo">136</span><a name="line.136"></a> |
| <span class="sourceLineNo">137</span> @Override<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> public void free() {<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> synchronized (this) {<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> if (freed) {<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> throw new IllegalStateException("Already freed.");<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> }<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> freed = true;<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> }<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> int bits = bits(last());<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> synchronized (ByteArrayPool.this) {<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> if (freeBuffers != null && freeBufferCount < maxFreeBuffers && freeMemory + last() <= maxFreeMemory) {<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> freeBuffers.get(bits).push(this);<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> freeBufferCount++;<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> freeMemory += last();<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> return;<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> }<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> }<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> }<a name="line.154"></a> |
| <span class="sourceLineNo">155</span><a name="line.155"></a> |
| <span class="sourceLineNo">156</span> }<a name="line.156"></a> |
| <span class="sourceLineNo">157</span><a name="line.157"></a> |
| <span class="sourceLineNo">158</span>}<a name="line.158"></a> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| </pre> |
| </div> |
| </body> |
| </html> |