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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.util;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.lang.ref.Reference;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.lang.ref.SoftReference;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">023</span><span id="line-23"></span> |
| <span class="source-line-no">024</span><span id="line-24">/**</span> |
| <span class="source-line-no">025</span><span id="line-25"> * A {@code SoftReference} based shared object pool. The objects are kept in soft references and</span> |
| <span class="source-line-no">026</span><span id="line-26"> * associated with keys which are identified by the {@code equals} method. The objects are created</span> |
| <span class="source-line-no">027</span><span id="line-27"> * by ObjectFactory on demand. The object creation is expected to be lightweight, and the objects</span> |
| <span class="source-line-no">028</span><span id="line-28"> * may be excessively created and discarded. Thread safe.</span> |
| <span class="source-line-no">029</span><span id="line-29"> */</span> |
| <span class="source-line-no">030</span><span id="line-30">@InterfaceAudience.Private</span> |
| <span class="source-line-no">031</span><span id="line-31">public class SoftObjectPool<K, V> extends ObjectPool<K, V> {</span> |
| <span class="source-line-no">032</span><span id="line-32"></span> |
| <span class="source-line-no">033</span><span id="line-33"> public SoftObjectPool(ObjectFactory<K, V> objectFactory) {</span> |
| <span class="source-line-no">034</span><span id="line-34"> super(objectFactory);</span> |
| <span class="source-line-no">035</span><span id="line-35"> }</span> |
| <span class="source-line-no">036</span><span id="line-36"></span> |
| <span class="source-line-no">037</span><span id="line-37"> public SoftObjectPool(ObjectFactory<K, V> objectFactory, int initialCapacity) {</span> |
| <span class="source-line-no">038</span><span id="line-38"> super(objectFactory, initialCapacity);</span> |
| <span class="source-line-no">039</span><span id="line-39"> }</span> |
| <span class="source-line-no">040</span><span id="line-40"></span> |
| <span class="source-line-no">041</span><span id="line-41"> public SoftObjectPool(ObjectFactory<K, V> objectFactory, int initialCapacity,</span> |
| <span class="source-line-no">042</span><span id="line-42"> int concurrencyLevel) {</span> |
| <span class="source-line-no">043</span><span id="line-43"> super(objectFactory, initialCapacity, concurrencyLevel);</span> |
| <span class="source-line-no">044</span><span id="line-44"> }</span> |
| <span class="source-line-no">045</span><span id="line-45"></span> |
| <span class="source-line-no">046</span><span id="line-46"> @Override</span> |
| <span class="source-line-no">047</span><span id="line-47"> public Reference<V> createReference(K key, V obj) {</span> |
| <span class="source-line-no">048</span><span id="line-48"> return new SoftObjectReference(key, obj);</span> |
| <span class="source-line-no">049</span><span id="line-49"> }</span> |
| <span class="source-line-no">050</span><span id="line-50"></span> |
| <span class="source-line-no">051</span><span id="line-51"> private class SoftObjectReference extends SoftReference<V> {</span> |
| <span class="source-line-no">052</span><span id="line-52"> final K key;</span> |
| <span class="source-line-no">053</span><span id="line-53"></span> |
| <span class="source-line-no">054</span><span id="line-54"> SoftObjectReference(K key, V obj) {</span> |
| <span class="source-line-no">055</span><span id="line-55"> super(obj, staleRefQueue);</span> |
| <span class="source-line-no">056</span><span id="line-56"> this.key = key;</span> |
| <span class="source-line-no">057</span><span id="line-57"> }</span> |
| <span class="source-line-no">058</span><span id="line-58"> }</span> |
| <span class="source-line-no">059</span><span id="line-59"></span> |
| <span class="source-line-no">060</span><span id="line-60"> @Override</span> |
| <span class="source-line-no">061</span><span id="line-61"> public K getReferenceKey(Reference<V> ref) {</span> |
| <span class="source-line-no">062</span><span id="line-62"> return ((SoftObjectReference) ref).key;</span> |
| <span class="source-line-no">063</span><span id="line-63"> }</span> |
| <span class="source-line-no">064</span><span id="line-64"></span> |
| <span class="source-line-no">065</span><span id="line-65">}</span> |
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