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<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, software<a name="line.12"></a>
<span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a>
<span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.util;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.io.IOException;<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.List;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.Locale;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.Map;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.Objects;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>/**<a name="line.30"></a>
<span class="sourceLineNo">031</span> * The &lt;code&gt;PoolMap&lt;/code&gt; maps a key to a collection of values, the elements of which are managed<a name="line.31"></a>
<span class="sourceLineNo">032</span> * by a pool. In effect, that collection acts as a shared pool of resources, access to which is<a name="line.32"></a>
<span class="sourceLineNo">033</span> * closely controlled as per the semantics of the pool.<a name="line.33"></a>
<span class="sourceLineNo">034</span> * &lt;p&gt;<a name="line.34"></a>
<span class="sourceLineNo">035</span> * In case the size of the pool is set to a non-zero positive number, that is used to cap the number<a name="line.35"></a>
<span class="sourceLineNo">036</span> * of resources that a pool may contain for any given key. A size of {@link Integer#MAX_VALUE} is<a name="line.36"></a>
<span class="sourceLineNo">037</span> * interpreted as an unbounded pool.<a name="line.37"></a>
<span class="sourceLineNo">038</span> * &lt;/p&gt;<a name="line.38"></a>
<span class="sourceLineNo">039</span> * &lt;p&gt;<a name="line.39"></a>
<span class="sourceLineNo">040</span> * PoolMap is thread-safe. It does not remove elements automatically. Unused resources must be<a name="line.40"></a>
<span class="sourceLineNo">041</span> * closed and removed explicitly.<a name="line.41"></a>
<span class="sourceLineNo">042</span> * &lt;/p&gt;<a name="line.42"></a>
<span class="sourceLineNo">043</span> * @param &lt;K&gt; the type of the key to the resource<a name="line.43"></a>
<span class="sourceLineNo">044</span> * @param &lt;V&gt; the type of the resource being pooled<a name="line.44"></a>
<span class="sourceLineNo">045</span> */<a name="line.45"></a>
<span class="sourceLineNo">046</span>@InterfaceAudience.Private<a name="line.46"></a>
<span class="sourceLineNo">047</span>public class PoolMap&lt;K, V&gt; {<a name="line.47"></a>
<span class="sourceLineNo">048</span> private final Map&lt;K, Pool&lt;V&gt;&gt; pools;<a name="line.48"></a>
<span class="sourceLineNo">049</span> private final PoolType poolType;<a name="line.49"></a>
<span class="sourceLineNo">050</span> private final int poolMaxSize;<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span> public PoolMap(PoolType poolType, int poolMaxSize) {<a name="line.52"></a>
<span class="sourceLineNo">053</span> pools = new HashMap&lt;&gt;();<a name="line.53"></a>
<span class="sourceLineNo">054</span> this.poolType = poolType;<a name="line.54"></a>
<span class="sourceLineNo">055</span> this.poolMaxSize = poolMaxSize;<a name="line.55"></a>
<span class="sourceLineNo">056</span> }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span> public V getOrCreate(K key, PoolResourceSupplier&lt;V&gt; supplier) throws IOException {<a name="line.58"></a>
<span class="sourceLineNo">059</span> synchronized (pools) {<a name="line.59"></a>
<span class="sourceLineNo">060</span> Pool&lt;V&gt; pool = pools.get(key);<a name="line.60"></a>
<span class="sourceLineNo">061</span><a name="line.61"></a>
<span class="sourceLineNo">062</span> if (pool == null) {<a name="line.62"></a>
<span class="sourceLineNo">063</span> pool = createPool();<a name="line.63"></a>
<span class="sourceLineNo">064</span> pools.put(key, pool);<a name="line.64"></a>
<span class="sourceLineNo">065</span> }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span> try {<a name="line.67"></a>
<span class="sourceLineNo">068</span> return pool.getOrCreate(supplier);<a name="line.68"></a>
<span class="sourceLineNo">069</span> } catch (IOException | RuntimeException | Error e) {<a name="line.69"></a>
<span class="sourceLineNo">070</span> if (pool.size() == 0) {<a name="line.70"></a>
<span class="sourceLineNo">071</span> pools.remove(key);<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> throw e;<a name="line.74"></a>
<span class="sourceLineNo">075</span> }<a name="line.75"></a>
<span class="sourceLineNo">076</span> }<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span> public boolean remove(K key, V value) {<a name="line.79"></a>
<span class="sourceLineNo">080</span> synchronized (pools) {<a name="line.80"></a>
<span class="sourceLineNo">081</span> Pool&lt;V&gt; pool = pools.get(key);<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span> if (pool == null) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> return false;<a name="line.84"></a>
<span class="sourceLineNo">085</span> }<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span> boolean removed = pool.remove(value);<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span> if (removed &amp;&amp; pool.size() == 0) {<a name="line.89"></a>
<span class="sourceLineNo">090</span> pools.remove(key);<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> return removed;<a name="line.93"></a>
<span class="sourceLineNo">094</span> }<a name="line.94"></a>
<span class="sourceLineNo">095</span> }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span> public List&lt;V&gt; values() {<a name="line.97"></a>
<span class="sourceLineNo">098</span> List&lt;V&gt; values = new ArrayList&lt;&gt;();<a name="line.98"></a>
<span class="sourceLineNo">099</span><a name="line.99"></a>
<span class="sourceLineNo">100</span> synchronized (pools) {<a name="line.100"></a>
<span class="sourceLineNo">101</span> for (Pool&lt;V&gt; pool : pools.values()) {<a name="line.101"></a>
<span class="sourceLineNo">102</span> Collection&lt;V&gt; poolValues = pool.values();<a name="line.102"></a>
<span class="sourceLineNo">103</span> if (poolValues != null) {<a name="line.103"></a>
<span class="sourceLineNo">104</span> values.addAll(poolValues);<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> }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span> return values;<a name="line.109"></a>
<span class="sourceLineNo">110</span> }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span> public void clear() {<a name="line.112"></a>
<span class="sourceLineNo">113</span> synchronized (pools) {<a name="line.113"></a>
<span class="sourceLineNo">114</span> for (Pool&lt;V&gt; pool : pools.values()) {<a name="line.114"></a>
<span class="sourceLineNo">115</span> pool.clear();<a name="line.115"></a>
<span class="sourceLineNo">116</span> }<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span> pools.clear();<a name="line.118"></a>
<span class="sourceLineNo">119</span> }<a name="line.119"></a>
<span class="sourceLineNo">120</span> }<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span> public interface PoolResourceSupplier&lt;R&gt; {<a name="line.122"></a>
<span class="sourceLineNo">123</span> R get() throws IOException;<a name="line.123"></a>
<span class="sourceLineNo">124</span> }<a name="line.124"></a>
<span class="sourceLineNo">125</span><a name="line.125"></a>
<span class="sourceLineNo">126</span> protected static &lt;V&gt; V createResource(PoolResourceSupplier&lt;V&gt; supplier) throws IOException {<a name="line.126"></a>
<span class="sourceLineNo">127</span> V resource = supplier.get();<a name="line.127"></a>
<span class="sourceLineNo">128</span> return Objects.requireNonNull(resource, "resource cannot be null.");<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> protected interface Pool&lt;R&gt; {<a name="line.131"></a>
<span class="sourceLineNo">132</span> R getOrCreate(PoolResourceSupplier&lt;R&gt; supplier) throws IOException;<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span> boolean remove(R resource);<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span> void clear();<a name="line.136"></a>
<span class="sourceLineNo">137</span><a name="line.137"></a>
<span class="sourceLineNo">138</span> Collection&lt;R&gt; values();<a name="line.138"></a>
<span class="sourceLineNo">139</span><a name="line.139"></a>
<span class="sourceLineNo">140</span> int size();<a name="line.140"></a>
<span class="sourceLineNo">141</span> }<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span> public enum PoolType {<a name="line.143"></a>
<span class="sourceLineNo">144</span> ThreadLocal,<a name="line.144"></a>
<span class="sourceLineNo">145</span> RoundRobin;<a name="line.145"></a>
<span class="sourceLineNo">146</span><a name="line.146"></a>
<span class="sourceLineNo">147</span> public static PoolType valueOf(String poolTypeName, PoolType defaultPoolType) {<a name="line.147"></a>
<span class="sourceLineNo">148</span> PoolType poolType = PoolType.fuzzyMatch(poolTypeName);<a name="line.148"></a>
<span class="sourceLineNo">149</span> return (poolType != null) ? poolType : defaultPoolType;<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> public static String fuzzyNormalize(String name) {<a name="line.152"></a>
<span class="sourceLineNo">153</span> return name != null ? name.replaceAll("-", "").trim().toLowerCase(Locale.ROOT) : "";<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> public static PoolType fuzzyMatch(String name) {<a name="line.156"></a>
<span class="sourceLineNo">157</span> for (PoolType poolType : values()) {<a name="line.157"></a>
<span class="sourceLineNo">158</span> if (fuzzyNormalize(name).equals(fuzzyNormalize(poolType.name()))) {<a name="line.158"></a>
<span class="sourceLineNo">159</span> return poolType;<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 null;<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><a name="line.165"></a>
<span class="sourceLineNo">166</span> protected Pool&lt;V&gt; createPool() {<a name="line.166"></a>
<span class="sourceLineNo">167</span> switch (poolType) {<a name="line.167"></a>
<span class="sourceLineNo">168</span> case RoundRobin:<a name="line.168"></a>
<span class="sourceLineNo">169</span> return new RoundRobinPool&lt;&gt;(poolMaxSize);<a name="line.169"></a>
<span class="sourceLineNo">170</span> case ThreadLocal:<a name="line.170"></a>
<span class="sourceLineNo">171</span> return new ThreadLocalPool&lt;&gt;();<a name="line.171"></a>
<span class="sourceLineNo">172</span> default:<a name="line.172"></a>
<span class="sourceLineNo">173</span> return new RoundRobinPool&lt;&gt;(poolMaxSize);<a name="line.173"></a>
<span class="sourceLineNo">174</span> }<a name="line.174"></a>
<span class="sourceLineNo">175</span> }<a name="line.175"></a>
<span class="sourceLineNo">176</span><a name="line.176"></a>
<span class="sourceLineNo">177</span> /**<a name="line.177"></a>
<span class="sourceLineNo">178</span> * The &lt;code&gt;RoundRobinPool&lt;/code&gt; represents a {@link PoolMap.Pool}, which stores its resources<a name="line.178"></a>
<span class="sourceLineNo">179</span> * in an {@link ArrayList}. It load-balances access to its resources by returning a different<a name="line.179"></a>
<span class="sourceLineNo">180</span> * resource every time a given key is looked up.<a name="line.180"></a>
<span class="sourceLineNo">181</span> * &lt;p&gt;<a name="line.181"></a>
<span class="sourceLineNo">182</span> * If {@link #maxSize} is set to {@link Integer#MAX_VALUE}, then the size of the pool is<a name="line.182"></a>
<span class="sourceLineNo">183</span> * unbounded. Otherwise, it caps the number of resources in this pool to the (non-zero positive)<a name="line.183"></a>
<span class="sourceLineNo">184</span> * value specified in {@link #maxSize}.<a name="line.184"></a>
<span class="sourceLineNo">185</span> * &lt;/p&gt;<a name="line.185"></a>
<span class="sourceLineNo">186</span> * @param &lt;R&gt; the type of the resource<a name="line.186"></a>
<span class="sourceLineNo">187</span> */<a name="line.187"></a>
<span class="sourceLineNo">188</span> @SuppressWarnings("serial")<a name="line.188"></a>
<span class="sourceLineNo">189</span> static class RoundRobinPool&lt;R&gt; implements Pool&lt;R&gt; {<a name="line.189"></a>
<span class="sourceLineNo">190</span> private final List&lt;R&gt; resources;<a name="line.190"></a>
<span class="sourceLineNo">191</span> private final int maxSize;<a name="line.191"></a>
<span class="sourceLineNo">192</span><a name="line.192"></a>
<span class="sourceLineNo">193</span> private int nextIndex;<a name="line.193"></a>
<span class="sourceLineNo">194</span><a name="line.194"></a>
<span class="sourceLineNo">195</span> public RoundRobinPool(int maxSize) {<a name="line.195"></a>
<span class="sourceLineNo">196</span> if (maxSize &lt;= 0) {<a name="line.196"></a>
<span class="sourceLineNo">197</span> throw new IllegalArgumentException("maxSize must be positive");<a name="line.197"></a>
<span class="sourceLineNo">198</span> }<a name="line.198"></a>
<span class="sourceLineNo">199</span><a name="line.199"></a>
<span class="sourceLineNo">200</span> resources = new ArrayList&lt;&gt;(maxSize);<a name="line.200"></a>
<span class="sourceLineNo">201</span> this.maxSize = maxSize;<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 R getOrCreate(PoolResourceSupplier&lt;R&gt; supplier) throws IOException {<a name="line.205"></a>
<span class="sourceLineNo">206</span> int size = resources.size();<a name="line.206"></a>
<span class="sourceLineNo">207</span> R resource;<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span> /* letting pool to grow */<a name="line.209"></a>
<span class="sourceLineNo">210</span> if (size &lt; maxSize) {<a name="line.210"></a>
<span class="sourceLineNo">211</span> resource = createResource(supplier);<a name="line.211"></a>
<span class="sourceLineNo">212</span> resources.add(resource);<a name="line.212"></a>
<span class="sourceLineNo">213</span> } else {<a name="line.213"></a>
<span class="sourceLineNo">214</span> resource = resources.get(nextIndex);<a name="line.214"></a>
<span class="sourceLineNo">215</span><a name="line.215"></a>
<span class="sourceLineNo">216</span> /* at this point size cannot be 0 */<a name="line.216"></a>
<span class="sourceLineNo">217</span> nextIndex = (nextIndex + 1) % size;<a name="line.217"></a>
<span class="sourceLineNo">218</span> }<a name="line.218"></a>
<span class="sourceLineNo">219</span><a name="line.219"></a>
<span class="sourceLineNo">220</span> return resource;<a name="line.220"></a>
<span class="sourceLineNo">221</span> }<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span> @Override<a name="line.223"></a>
<span class="sourceLineNo">224</span> public boolean remove(R resource) {<a name="line.224"></a>
<span class="sourceLineNo">225</span> return resources.remove(resource);<a name="line.225"></a>
<span class="sourceLineNo">226</span> }<a name="line.226"></a>
<span class="sourceLineNo">227</span><a name="line.227"></a>
<span class="sourceLineNo">228</span> @Override<a name="line.228"></a>
<span class="sourceLineNo">229</span> public void clear() {<a name="line.229"></a>
<span class="sourceLineNo">230</span> resources.clear();<a name="line.230"></a>
<span class="sourceLineNo">231</span> }<a name="line.231"></a>
<span class="sourceLineNo">232</span><a name="line.232"></a>
<span class="sourceLineNo">233</span> @Override<a name="line.233"></a>
<span class="sourceLineNo">234</span> public Collection&lt;R&gt; values() {<a name="line.234"></a>
<span class="sourceLineNo">235</span> return resources;<a name="line.235"></a>
<span class="sourceLineNo">236</span> }<a name="line.236"></a>
<span class="sourceLineNo">237</span><a name="line.237"></a>
<span class="sourceLineNo">238</span> @Override<a name="line.238"></a>
<span class="sourceLineNo">239</span> public int size() {<a name="line.239"></a>
<span class="sourceLineNo">240</span> return resources.size();<a name="line.240"></a>
<span class="sourceLineNo">241</span> }<a name="line.241"></a>
<span class="sourceLineNo">242</span> }<a name="line.242"></a>
<span class="sourceLineNo">243</span><a name="line.243"></a>
<span class="sourceLineNo">244</span> /**<a name="line.244"></a>
<span class="sourceLineNo">245</span> * The &lt;code&gt;ThreadLocalPool&lt;/code&gt; represents a {@link PoolMap.Pool} that works similarly to<a name="line.245"></a>
<span class="sourceLineNo">246</span> * {@link ThreadLocal} class. It essentially binds the resource to the thread from which it is<a name="line.246"></a>
<span class="sourceLineNo">247</span> * accessed. It doesn't remove resources when a thread exits, those resources must be closed<a name="line.247"></a>
<span class="sourceLineNo">248</span> * manually.<a name="line.248"></a>
<span class="sourceLineNo">249</span> * &lt;p&gt;<a name="line.249"></a>
<span class="sourceLineNo">250</span> * Note that the size of the pool is essentially bounded by the number of threads that add<a name="line.250"></a>
<span class="sourceLineNo">251</span> * resources to this pool.<a name="line.251"></a>
<span class="sourceLineNo">252</span> * &lt;/p&gt;<a name="line.252"></a>
<span class="sourceLineNo">253</span> * @param &lt;R&gt; the type of the resource<a name="line.253"></a>
<span class="sourceLineNo">254</span> */<a name="line.254"></a>
<span class="sourceLineNo">255</span> static class ThreadLocalPool&lt;R&gt; implements Pool&lt;R&gt; {<a name="line.255"></a>
<span class="sourceLineNo">256</span> private final Map&lt;Thread, R&gt; resources;<a name="line.256"></a>
<span class="sourceLineNo">257</span><a name="line.257"></a>
<span class="sourceLineNo">258</span> public ThreadLocalPool() {<a name="line.258"></a>
<span class="sourceLineNo">259</span> resources = new HashMap&lt;&gt;();<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> @Override<a name="line.262"></a>
<span class="sourceLineNo">263</span> public R getOrCreate(PoolResourceSupplier&lt;R&gt; supplier) throws IOException {<a name="line.263"></a>
<span class="sourceLineNo">264</span> Thread myself = Thread.currentThread();<a name="line.264"></a>
<span class="sourceLineNo">265</span> R resource = resources.get(myself);<a name="line.265"></a>
<span class="sourceLineNo">266</span><a name="line.266"></a>
<span class="sourceLineNo">267</span> if (resource == null) {<a name="line.267"></a>
<span class="sourceLineNo">268</span> resource = createResource(supplier);<a name="line.268"></a>
<span class="sourceLineNo">269</span> resources.put(myself, resource);<a name="line.269"></a>
<span class="sourceLineNo">270</span> }<a name="line.270"></a>
<span class="sourceLineNo">271</span><a name="line.271"></a>
<span class="sourceLineNo">272</span> return resource;<a name="line.272"></a>
<span class="sourceLineNo">273</span> }<a name="line.273"></a>
<span class="sourceLineNo">274</span><a name="line.274"></a>
<span class="sourceLineNo">275</span> @Override<a name="line.275"></a>
<span class="sourceLineNo">276</span> public boolean remove(R resource) {<a name="line.276"></a>
<span class="sourceLineNo">277</span> /* remove can be called from any thread */<a name="line.277"></a>
<span class="sourceLineNo">278</span> return resources.values().remove(resource);<a name="line.278"></a>
<span class="sourceLineNo">279</span> }<a name="line.279"></a>
<span class="sourceLineNo">280</span><a name="line.280"></a>
<span class="sourceLineNo">281</span> @Override<a name="line.281"></a>
<span class="sourceLineNo">282</span> public int size() {<a name="line.282"></a>
<span class="sourceLineNo">283</span> return resources.size();<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 void clear() {<a name="line.287"></a>
<span class="sourceLineNo">288</span> resources.clear();<a name="line.288"></a>
<span class="sourceLineNo">289</span> }<a name="line.289"></a>
<span class="sourceLineNo">290</span><a name="line.290"></a>
<span class="sourceLineNo">291</span> @Override<a name="line.291"></a>
<span class="sourceLineNo">292</span> public Collection&lt;R&gt; values() {<a name="line.292"></a>
<span class="sourceLineNo">293</span> return resources.values();<a name="line.293"></a>
<span class="sourceLineNo">294</span> }<a name="line.294"></a>
<span class="sourceLineNo">295</span> }<a name="line.295"></a>
<span class="sourceLineNo">296</span>}<a name="line.296"></a>
</pre>
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