| <!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> *<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> *<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> *<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> */<a name="line.18"></a> |
| <span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.util;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.util.ArrayList;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.Collection;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.HashMap;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.util.HashSet;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import java.util.List;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import java.util.Locale;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import java.util.Map;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import java.util.Set;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import java.util.concurrent.CopyOnWriteArrayList;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span><a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span><a name="line.34"></a> |
| <span class="sourceLineNo">035</span>/**<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> *<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * The <code>PoolMap</code> maps a key to a collection of values, the elements<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * of which are managed by a pool. In effect, that collection acts as a shared<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> * pool of resources, access to which is closely controlled as per the semantics<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * of the pool.<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> *<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * <p><a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * In case the size of the pool is set to a non-zero positive number, that is<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * used to cap the number of resources that a pool may contain for any given<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * key. A size of {@link Integer#MAX_VALUE} is interpreted as an unbounded pool.<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> * </p><a name="line.46"></a> |
| <span class="sourceLineNo">047</span> *<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> * @param <K><a name="line.48"></a> |
| <span class="sourceLineNo">049</span> * the type of the key to the resource<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> * @param <V><a name="line.50"></a> |
| <span class="sourceLineNo">051</span> * the type of the resource being pooled<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> */<a name="line.52"></a> |
| <span class="sourceLineNo">053</span>@InterfaceAudience.Private<a name="line.53"></a> |
| <span class="sourceLineNo">054</span>public class PoolMap<K, V> implements Map<K, V> {<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> private PoolType poolType;<a name="line.55"></a> |
| <span class="sourceLineNo">056</span><a name="line.56"></a> |
| <span class="sourceLineNo">057</span> private int poolMaxSize;<a name="line.57"></a> |
| <span class="sourceLineNo">058</span><a name="line.58"></a> |
| <span class="sourceLineNo">059</span> private Map<K, Pool<V>> pools = new ConcurrentHashMap<>();<a name="line.59"></a> |
| <span class="sourceLineNo">060</span><a name="line.60"></a> |
| <span class="sourceLineNo">061</span> public PoolMap(PoolType poolType) {<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> this.poolType = poolType;<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> }<a name="line.63"></a> |
| <span class="sourceLineNo">064</span><a name="line.64"></a> |
| <span class="sourceLineNo">065</span> public PoolMap(PoolType poolType, int poolMaxSize) {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> this.poolType = poolType;<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> this.poolMaxSize = poolMaxSize;<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> }<a name="line.68"></a> |
| <span class="sourceLineNo">069</span><a name="line.69"></a> |
| <span class="sourceLineNo">070</span> @Override<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> public V get(Object key) {<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> Pool<V> pool = pools.get(key);<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> return pool != null ? pool.get() : null;<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> }<a name="line.74"></a> |
| <span class="sourceLineNo">075</span><a name="line.75"></a> |
| <span class="sourceLineNo">076</span> @Override<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> public V put(K key, V value) {<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> Pool<V> pool = pools.get(key);<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> if (pool == null) {<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> pools.put(key, pool = createPool());<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> }<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> return pool != null ? pool.put(value) : null;<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> }<a name="line.83"></a> |
| <span class="sourceLineNo">084</span><a name="line.84"></a> |
| <span class="sourceLineNo">085</span> @SuppressWarnings("unchecked")<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> @Override<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> public V remove(Object key) {<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> Pool<V> pool = pools.remove(key);<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> if (pool != null) {<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> removeValue((K) key, pool.get());<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> }<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> return null;<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> }<a name="line.93"></a> |
| <span class="sourceLineNo">094</span><a name="line.94"></a> |
| <span class="sourceLineNo">095</span> public boolean removeValue(K key, V value) {<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> Pool<V> pool = pools.get(key);<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> boolean res = false;<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> if (pool != null) {<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> res = pool.remove(value);<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> if (res && pool.size() == 0) {<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> pools.remove(key);<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> }<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> }<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> return res;<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> }<a name="line.105"></a> |
| <span class="sourceLineNo">106</span><a name="line.106"></a> |
| <span class="sourceLineNo">107</span> @Override<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> public Collection<V> values() {<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> Collection<V> values = new ArrayList<>();<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> for (Pool<V> pool : pools.values()) {<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> Collection<V> poolValues = pool.values();<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> if (poolValues != null) {<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> values.addAll(poolValues);<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> }<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> }<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> return values;<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> }<a name="line.117"></a> |
| <span class="sourceLineNo">118</span><a name="line.118"></a> |
| <span class="sourceLineNo">119</span> public Collection<V> values(K key) {<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> Collection<V> values = new ArrayList<>();<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> Pool<V> pool = pools.get(key);<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> if (pool != null) {<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> Collection<V> poolValues = pool.values();<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> if (poolValues != null) {<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> values.addAll(poolValues);<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> }<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> }<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> return values;<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> }<a name="line.129"></a> |
| <span class="sourceLineNo">130</span><a name="line.130"></a> |
| <span class="sourceLineNo">131</span><a name="line.131"></a> |
| <span class="sourceLineNo">132</span> @Override<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> public boolean isEmpty() {<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> return pools.isEmpty();<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 int size() {<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> return pools.size();<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> }<a name="line.140"></a> |
| <span class="sourceLineNo">141</span><a name="line.141"></a> |
| <span class="sourceLineNo">142</span> public int size(K key) {<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> Pool<V> pool = pools.get(key);<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> return pool != null ? pool.size() : 0;<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> }<a name="line.145"></a> |
| <span class="sourceLineNo">146</span><a name="line.146"></a> |
| <span class="sourceLineNo">147</span> @Override<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> public boolean containsKey(Object key) {<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> return pools.containsKey(key);<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> }<a name="line.150"></a> |
| <span class="sourceLineNo">151</span><a name="line.151"></a> |
| <span class="sourceLineNo">152</span> @Override<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> public boolean containsValue(Object value) {<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> if (value == null) {<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> return false;<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> }<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> for (Pool<V> pool : pools.values()) {<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> if (value.equals(pool.get())) {<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> return true;<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> }<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> }<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> return false;<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> }<a name="line.163"></a> |
| <span class="sourceLineNo">164</span><a name="line.164"></a> |
| <span class="sourceLineNo">165</span> @Override<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> public void putAll(Map<? extends K, ? extends V> map) {<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> for (Map.Entry<? extends K, ? extends V> entry : map.entrySet()) {<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> put(entry.getKey(), entry.getValue());<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> }<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> }<a name="line.170"></a> |
| <span class="sourceLineNo">171</span><a name="line.171"></a> |
| <span class="sourceLineNo">172</span> @Override<a name="line.172"></a> |
| <span class="sourceLineNo">173</span> public void clear() {<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> for (Pool<V> pool : pools.values()) {<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> pool.clear();<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> }<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> pools.clear();<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> }<a name="line.178"></a> |
| <span class="sourceLineNo">179</span><a name="line.179"></a> |
| <span class="sourceLineNo">180</span> @Override<a name="line.180"></a> |
| <span class="sourceLineNo">181</span> public Set<K> keySet() {<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> return pools.keySet();<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> }<a name="line.183"></a> |
| <span class="sourceLineNo">184</span><a name="line.184"></a> |
| <span class="sourceLineNo">185</span> @Override<a name="line.185"></a> |
| <span class="sourceLineNo">186</span> public Set<Map.Entry<K, V>> entrySet() {<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> Set<Map.Entry<K, V>> entries = new HashSet<>();<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> for (Map.Entry<K, Pool<V>> poolEntry : pools.entrySet()) {<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> final K poolKey = poolEntry.getKey();<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> final Pool<V> pool = poolEntry.getValue();<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> if (pool != null) {<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> for (final V poolValue : pool.values()) {<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> entries.add(new Map.Entry<K, V>() {<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> @Override<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> public K getKey() {<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> return poolKey;<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> }<a name="line.197"></a> |
| <span class="sourceLineNo">198</span><a name="line.198"></a> |
| <span class="sourceLineNo">199</span> @Override<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> public V getValue() {<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> return poolValue;<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> }<a name="line.202"></a> |
| <span class="sourceLineNo">203</span><a name="line.203"></a> |
| <span class="sourceLineNo">204</span> @Override<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> public V setValue(V value) {<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> return pool.put(value);<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> }<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> });<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> }<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> }<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> }<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> return entries;<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> }<a name="line.213"></a> |
| <span class="sourceLineNo">214</span><a name="line.214"></a> |
| <span class="sourceLineNo">215</span> protected interface Pool<R> {<a name="line.215"></a> |
| <span class="sourceLineNo">216</span> R get();<a name="line.216"></a> |
| <span class="sourceLineNo">217</span><a name="line.217"></a> |
| <span class="sourceLineNo">218</span> R put(R resource);<a name="line.218"></a> |
| <span class="sourceLineNo">219</span><a name="line.219"></a> |
| <span class="sourceLineNo">220</span> boolean remove(R resource);<a name="line.220"></a> |
| <span class="sourceLineNo">221</span><a name="line.221"></a> |
| <span class="sourceLineNo">222</span> void clear();<a name="line.222"></a> |
| <span class="sourceLineNo">223</span><a name="line.223"></a> |
| <span class="sourceLineNo">224</span> Collection<R> values();<a name="line.224"></a> |
| <span class="sourceLineNo">225</span><a name="line.225"></a> |
| <span class="sourceLineNo">226</span> int size();<a name="line.226"></a> |
| <span class="sourceLineNo">227</span> }<a name="line.227"></a> |
| <span class="sourceLineNo">228</span><a name="line.228"></a> |
| <span class="sourceLineNo">229</span> public enum PoolType {<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> ThreadLocal, RoundRobin;<a name="line.230"></a> |
| <span class="sourceLineNo">231</span><a name="line.231"></a> |
| <span class="sourceLineNo">232</span> public static PoolType valueOf(String poolTypeName, PoolType defaultPoolType) {<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> PoolType poolType = PoolType.fuzzyMatch(poolTypeName);<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> return (poolType != null) ? poolType : defaultPoolType;<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> }<a name="line.235"></a> |
| <span class="sourceLineNo">236</span><a name="line.236"></a> |
| <span class="sourceLineNo">237</span> public static String fuzzyNormalize(String name) {<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> return name != null ? name.replaceAll("-", "").trim().toLowerCase(Locale.ROOT) : "";<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> }<a name="line.239"></a> |
| <span class="sourceLineNo">240</span><a name="line.240"></a> |
| <span class="sourceLineNo">241</span> public static PoolType fuzzyMatch(String name) {<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> for (PoolType poolType : values()) {<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> if (fuzzyNormalize(name).equals(fuzzyNormalize(poolType.name()))) {<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> return poolType;<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> }<a name="line.245"></a> |
| <span class="sourceLineNo">246</span> }<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> return null;<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> }<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> }<a name="line.249"></a> |
| <span class="sourceLineNo">250</span><a name="line.250"></a> |
| <span class="sourceLineNo">251</span> protected Pool<V> createPool() {<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> switch (poolType) {<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> case RoundRobin:<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> return new RoundRobinPool<>(poolMaxSize);<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> case ThreadLocal:<a name="line.255"></a> |
| <span class="sourceLineNo">256</span> return new ThreadLocalPool<>();<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> }<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> return null;<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> }<a name="line.259"></a> |
| <span class="sourceLineNo">260</span><a name="line.260"></a> |
| <span class="sourceLineNo">261</span> /**<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> * The <code>RoundRobinPool</code> represents a {@link PoolMap.Pool}, which<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> * stores its resources in an {@link ArrayList}. It load-balances access to<a name="line.263"></a> |
| <span class="sourceLineNo">264</span> * its resources by returning a different resource every time a given key is<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> * looked up.<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> *<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> * <p><a name="line.267"></a> |
| <span class="sourceLineNo">268</span> * If {@link #maxSize} is set to {@link Integer#MAX_VALUE}, then the size of<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> * the pool is unbounded. Otherwise, it caps the number of resources in this<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> * pool to the (non-zero positive) value specified in {@link #maxSize}.<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> * </p><a name="line.271"></a> |
| <span class="sourceLineNo">272</span> *<a name="line.272"></a> |
| <span class="sourceLineNo">273</span> * @param <R><a name="line.273"></a> |
| <span class="sourceLineNo">274</span> * the type of the resource<a name="line.274"></a> |
| <span class="sourceLineNo">275</span> *<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> */<a name="line.276"></a> |
| <span class="sourceLineNo">277</span> @SuppressWarnings("serial")<a name="line.277"></a> |
| <span class="sourceLineNo">278</span> static class RoundRobinPool<R> extends CopyOnWriteArrayList<R> implements Pool<R> {<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> private int maxSize;<a name="line.279"></a> |
| <span class="sourceLineNo">280</span> private int nextResource = 0;<a name="line.280"></a> |
| <span class="sourceLineNo">281</span><a name="line.281"></a> |
| <span class="sourceLineNo">282</span> public RoundRobinPool(int maxSize) {<a name="line.282"></a> |
| <span class="sourceLineNo">283</span> this.maxSize = maxSize;<a name="line.283"></a> |
| <span class="sourceLineNo">284</span> }<a name="line.284"></a> |
| <span class="sourceLineNo">285</span><a name="line.285"></a> |
| <span class="sourceLineNo">286</span> @Override<a name="line.286"></a> |
| <span class="sourceLineNo">287</span> public R put(R resource) {<a name="line.287"></a> |
| <span class="sourceLineNo">288</span> if (super.size() < maxSize) {<a name="line.288"></a> |
| <span class="sourceLineNo">289</span> add(resource);<a name="line.289"></a> |
| <span class="sourceLineNo">290</span> }<a name="line.290"></a> |
| <span class="sourceLineNo">291</span> return null;<a name="line.291"></a> |
| <span class="sourceLineNo">292</span> }<a name="line.292"></a> |
| <span class="sourceLineNo">293</span><a name="line.293"></a> |
| <span class="sourceLineNo">294</span> @Override<a name="line.294"></a> |
| <span class="sourceLineNo">295</span> public R get() {<a name="line.295"></a> |
| <span class="sourceLineNo">296</span> if (super.size() < maxSize) {<a name="line.296"></a> |
| <span class="sourceLineNo">297</span> return null;<a name="line.297"></a> |
| <span class="sourceLineNo">298</span> }<a name="line.298"></a> |
| <span class="sourceLineNo">299</span> nextResource %= super.size();<a name="line.299"></a> |
| <span class="sourceLineNo">300</span> R resource = get(nextResource++);<a name="line.300"></a> |
| <span class="sourceLineNo">301</span> return resource;<a name="line.301"></a> |
| <span class="sourceLineNo">302</span> }<a name="line.302"></a> |
| <span class="sourceLineNo">303</span><a name="line.303"></a> |
| <span class="sourceLineNo">304</span> @Override<a name="line.304"></a> |
| <span class="sourceLineNo">305</span> public Collection<R> values() {<a name="line.305"></a> |
| <span class="sourceLineNo">306</span> return this;<a name="line.306"></a> |
| <span class="sourceLineNo">307</span> }<a name="line.307"></a> |
| <span class="sourceLineNo">308</span><a name="line.308"></a> |
| <span class="sourceLineNo">309</span> }<a name="line.309"></a> |
| <span class="sourceLineNo">310</span><a name="line.310"></a> |
| <span class="sourceLineNo">311</span> /**<a name="line.311"></a> |
| <span class="sourceLineNo">312</span> * The <code>ThreadLocalPool</code> represents a {@link PoolMap.Pool} that<a name="line.312"></a> |
| <span class="sourceLineNo">313</span> * builds on the {@link ThreadLocal} class. It essentially binds the resource<a name="line.313"></a> |
| <span class="sourceLineNo">314</span> * to the thread from which it is accessed.<a name="line.314"></a> |
| <span class="sourceLineNo">315</span> *<a name="line.315"></a> |
| <span class="sourceLineNo">316</span> * <p><a name="line.316"></a> |
| <span class="sourceLineNo">317</span> * Note that the size of the pool is essentially bounded by the number of threads<a name="line.317"></a> |
| <span class="sourceLineNo">318</span> * that add resources to this pool.<a name="line.318"></a> |
| <span class="sourceLineNo">319</span> * </p><a name="line.319"></a> |
| <span class="sourceLineNo">320</span> *<a name="line.320"></a> |
| <span class="sourceLineNo">321</span> * @param <R><a name="line.321"></a> |
| <span class="sourceLineNo">322</span> * the type of the resource<a name="line.322"></a> |
| <span class="sourceLineNo">323</span> */<a name="line.323"></a> |
| <span class="sourceLineNo">324</span> static class ThreadLocalPool<R> extends ThreadLocal<R> implements Pool<R> {<a name="line.324"></a> |
| <span class="sourceLineNo">325</span> private static final Map<ThreadLocalPool<?>, AtomicInteger> poolSizes = new HashMap<>();<a name="line.325"></a> |
| <span class="sourceLineNo">326</span><a name="line.326"></a> |
| <span class="sourceLineNo">327</span> public ThreadLocalPool() {<a name="line.327"></a> |
| <span class="sourceLineNo">328</span> }<a name="line.328"></a> |
| <span class="sourceLineNo">329</span><a name="line.329"></a> |
| <span class="sourceLineNo">330</span> @Override<a name="line.330"></a> |
| <span class="sourceLineNo">331</span> public R put(R resource) {<a name="line.331"></a> |
| <span class="sourceLineNo">332</span> R previousResource = get();<a name="line.332"></a> |
| <span class="sourceLineNo">333</span> if (previousResource == null) {<a name="line.333"></a> |
| <span class="sourceLineNo">334</span> AtomicInteger poolSize = poolSizes.get(this);<a name="line.334"></a> |
| <span class="sourceLineNo">335</span> if (poolSize == null) {<a name="line.335"></a> |
| <span class="sourceLineNo">336</span> poolSizes.put(this, poolSize = new AtomicInteger(0));<a name="line.336"></a> |
| <span class="sourceLineNo">337</span> }<a name="line.337"></a> |
| <span class="sourceLineNo">338</span> poolSize.incrementAndGet();<a name="line.338"></a> |
| <span class="sourceLineNo">339</span> }<a name="line.339"></a> |
| <span class="sourceLineNo">340</span> this.set(resource);<a name="line.340"></a> |
| <span class="sourceLineNo">341</span> return previousResource;<a name="line.341"></a> |
| <span class="sourceLineNo">342</span> }<a name="line.342"></a> |
| <span class="sourceLineNo">343</span><a name="line.343"></a> |
| <span class="sourceLineNo">344</span> @Override<a name="line.344"></a> |
| <span class="sourceLineNo">345</span> public void remove() {<a name="line.345"></a> |
| <span class="sourceLineNo">346</span> super.remove();<a name="line.346"></a> |
| <span class="sourceLineNo">347</span> AtomicInteger poolSize = poolSizes.get(this);<a name="line.347"></a> |
| <span class="sourceLineNo">348</span> if (poolSize != null) {<a name="line.348"></a> |
| <span class="sourceLineNo">349</span> poolSize.decrementAndGet();<a name="line.349"></a> |
| <span class="sourceLineNo">350</span> }<a name="line.350"></a> |
| <span class="sourceLineNo">351</span> }<a name="line.351"></a> |
| <span class="sourceLineNo">352</span><a name="line.352"></a> |
| <span class="sourceLineNo">353</span> @Override<a name="line.353"></a> |
| <span class="sourceLineNo">354</span> public int size() {<a name="line.354"></a> |
| <span class="sourceLineNo">355</span> AtomicInteger poolSize = poolSizes.get(this);<a name="line.355"></a> |
| <span class="sourceLineNo">356</span> return poolSize != null ? poolSize.get() : 0;<a name="line.356"></a> |
| <span class="sourceLineNo">357</span> }<a name="line.357"></a> |
| <span class="sourceLineNo">358</span><a name="line.358"></a> |
| <span class="sourceLineNo">359</span> @Override<a name="line.359"></a> |
| <span class="sourceLineNo">360</span> public boolean remove(R resource) {<a name="line.360"></a> |
| <span class="sourceLineNo">361</span> R previousResource = super.get();<a name="line.361"></a> |
| <span class="sourceLineNo">362</span> if (resource != null && resource.equals(previousResource)) {<a name="line.362"></a> |
| <span class="sourceLineNo">363</span> remove();<a name="line.363"></a> |
| <span class="sourceLineNo">364</span> return true;<a name="line.364"></a> |
| <span class="sourceLineNo">365</span> } else {<a name="line.365"></a> |
| <span class="sourceLineNo">366</span> return false;<a name="line.366"></a> |
| <span class="sourceLineNo">367</span> }<a name="line.367"></a> |
| <span class="sourceLineNo">368</span> }<a name="line.368"></a> |
| <span class="sourceLineNo">369</span><a name="line.369"></a> |
| <span class="sourceLineNo">370</span> @Override<a name="line.370"></a> |
| <span class="sourceLineNo">371</span> public void clear() {<a name="line.371"></a> |
| <span class="sourceLineNo">372</span> super.remove();<a name="line.372"></a> |
| <span class="sourceLineNo">373</span> }<a name="line.373"></a> |
| <span class="sourceLineNo">374</span><a name="line.374"></a> |
| <span class="sourceLineNo">375</span> @Override<a name="line.375"></a> |
| <span class="sourceLineNo">376</span> public Collection<R> values() {<a name="line.376"></a> |
| <span class="sourceLineNo">377</span> List<R> values = new ArrayList<>();<a name="line.377"></a> |
| <span class="sourceLineNo">378</span> values.add(get());<a name="line.378"></a> |
| <span class="sourceLineNo">379</span> return values;<a name="line.379"></a> |
| <span class="sourceLineNo">380</span> }<a name="line.380"></a> |
| <span class="sourceLineNo">381</span> }<a name="line.381"></a> |
| <span class="sourceLineNo">382</span>}<a name="line.382"></a> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| </pre> |
| </div> |
| </body> |
| </html> |
