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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head><meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" /><title>SoftReferenceObjectPool xref</title><link type="text/css" rel="stylesheet" href="../../../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../../../apidocs/org/apache/commons/pool/impl/SoftReferenceObjectPool.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*</em><a name="2" href="#2">2</a> <em class="comment"> * Copyright 1999-2004 The Apache Software Foundation.</em><a name="3" href="#3">3</a> <em class="comment"> * </em><a name="4" href="#4">4</a> <em class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</em><a name="5" href="#5">5</a> <em class="comment"> * you may not use this file except in compliance with the License.</em><a name="6" href="#6">6</a> <em class="comment"> * You may obtain a copy of the License at</em><a name="7" href="#7">7</a> <em class="comment"> * </em><a name="8" href="#8">8</a> <em class="comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em><a name="9" href="#9">9</a> <em class="comment"> * </em><a name="10" href="#10">10</a> <em class="comment"> * Unless required by applicable law or agreed to in writing, software</em><a name="11" href="#11">11</a> <em class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em><a name="12" href="#12">12</a> <em class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em><a name="13" href="#13">13</a> <em class="comment"> * See the License for the specific language governing permissions and</em><a name="14" href="#14">14</a> <em class="comment"> * limitations under the License.</em><a name="15" href="#15">15</a> <em class="comment"> */</em><a name="16" href="#16">16</a> <a name="17" href="#17">17</a> <strong>package</strong> <a href="../../../../../org/apache/commons/pool/impl/package-summary.html">org.apache.commons.pool.impl</a>;<a name="18" href="#18">18</a> <a name="19" href="#19">19</a> <strong>import</strong> java.lang.ref.SoftReference;<a name="20" href="#20">20</a> <strong>import</strong> java.util.ArrayList;<a name="21" href="#21">21</a> <strong>import</strong> java.util.Iterator;<a name="22" href="#22">22</a> <strong>import</strong> java.util.List;<a name="23" href="#23">23</a> <strong>import</strong> java.util.NoSuchElementException;<a name="24" href="#24">24</a> <a name="25" href="#25">25</a> <strong>import</strong> org.apache.commons.pool.BaseObjectPool;<a name="26" href="#26">26</a> <strong>import</strong> org.apache.commons.pool.ObjectPool;<a name="27" href="#27">27</a> <strong>import</strong> org.apache.commons.pool.PoolableObjectFactory;<a name="28" href="#28">28</a> <a name="29" href="#29">29</a> <em>/**<em>*</em></em><a name="30" href="#30">30</a> <em> * A {@link java.lang.ref.SoftReference SoftReference} based</em><a name="31" href="#31">31</a> <em> * {@link ObjectPool}.</em><a name="32" href="#32">32</a> <em> *</em><a name="33" href="#33">33</a> <em> * @author Rodney Waldhoff</em><a name="34" href="#34">34</a> <em> * @version $Revision: 383290 $ $Date: 2006-03-05 02:00:15 -0500 (Sun, 05 Mar 2006) $</em><a name="35" href="#35">35</a> <em> */</em><a name="36" href="#36">36</a> <strong>public</strong> <strong>class</strong> <a href="../../../../../org/apache/commons/pool/impl/SoftReferenceObjectPool.html">SoftReferenceObjectPool</a> <strong>extends</strong> <a href="../../../../../org/apache/commons/pool/BaseObjectPool.html">BaseObjectPool</a> implements <a href="../../../../../org/apache/commons/pool/ObjectPool.html">ObjectPool</a> {<a name="37" href="#37">37</a> <strong>public</strong> <a href="../../../../../org/apache/commons/pool/impl/SoftReferenceObjectPool.html">SoftReferenceObjectPool</a>() {<a name="38" href="#38">38</a> _pool = <strong>new</strong> ArrayList();<a name="39" href="#39">39</a> _factory = <strong>null</strong>;<a name="40" href="#40">40</a> }<a name="41" href="#41">41</a> <a name="42" href="#42">42</a> <strong>public</strong> <a href="../../../../../org/apache/commons/pool/impl/SoftReferenceObjectPool.html">SoftReferenceObjectPool</a>(<a href="../../../../../org/apache/commons/pool/PoolableObjectFactory.html">PoolableObjectFactory</a> factory) {<a name="43" href="#43">43</a> _pool = <strong>new</strong> ArrayList();<a name="44" href="#44">44</a> _factory = factory;<a name="45" href="#45">45</a> }<a name="46" href="#46">46</a> <a name="47" href="#47">47</a> <strong>public</strong> <a href="../../../../../org/apache/commons/pool/impl/SoftReferenceObjectPool.html">SoftReferenceObjectPool</a>(<a href="../../../../../org/apache/commons/pool/PoolableObjectFactory.html">PoolableObjectFactory</a> factory, <strong>int</strong> initSize) throws Exception {<a name="48" href="#48">48</a> _pool = <strong>new</strong> ArrayList();<a name="49" href="#49">49</a> _factory = factory;<a name="50" href="#50">50</a> <strong>if</strong>(<strong>null</strong> != _factory) {<a name="51" href="#51">51</a> <strong>for</strong>(<strong>int</strong> i=0;i<initSize;i++) {<a name="52" href="#52">52</a> Object obj = _factory.makeObject();<a name="53" href="#53">53</a> _factory.passivateObject(obj);<a name="54" href="#54">54</a> _pool.add(<strong>new</strong> SoftReference(obj));<a name="55" href="#55">55</a> }<a name="56" href="#56">56</a> }<a name="57" href="#57">57</a> }<a name="58" href="#58">58</a> <a name="59" href="#59">59</a> <strong>public</strong> <strong>synchronized</strong> Object borrowObject() throws Exception { <a name="60" href="#60">60</a> assertOpen();<a name="61" href="#61">61</a> Object obj = <strong>null</strong>;<a name="62" href="#62">62</a> <strong>while</strong>(<strong>null</strong> == obj) {<a name="63" href="#63">63</a> <strong>if</strong>(_pool.isEmpty()) {<a name="64" href="#64">64</a> <strong>if</strong>(<strong>null</strong> == _factory) {<a name="65" href="#65">65</a> <strong>throw</strong> <strong>new</strong> NoSuchElementException();<a name="66" href="#66">66</a> } <strong>else</strong> {<a name="67" href="#67">67</a> obj = _factory.makeObject();<a name="68" href="#68">68</a> }<a name="69" href="#69">69</a> } <strong>else</strong> {<a name="70" href="#70">70</a> SoftReference ref = (SoftReference)(_pool.remove(_pool.size() - 1));<a name="71" href="#71">71</a> obj = ref.get();<a name="72" href="#72">72</a> }<a name="73" href="#73">73</a> <strong>if</strong>(<strong>null</strong> != _factory && <strong>null</strong> != obj) {<a name="74" href="#74">74</a> _factory.activateObject(obj);<a name="75" href="#75">75</a> }<a name="76" href="#76">76</a> <strong>if</strong> (<strong>null</strong> != _factory && <strong>null</strong> != obj && !_factory.validateObject(obj)) {<a name="77" href="#77">77</a> _factory.destroyObject(obj);<a name="78" href="#78">78</a> obj = <strong>null</strong>;<a name="79" href="#79">79</a> }<a name="80" href="#80">80</a> }<a name="81" href="#81">81</a> _numActive++;<a name="82" href="#82">82</a> <strong>return</strong> obj;<a name="83" href="#83">83</a> }<a name="84" href="#84">84</a> <a name="85" href="#85">85</a> <strong>public</strong> <strong>synchronized</strong> <strong>void</strong> returnObject(Object obj) throws Exception {<a name="86" href="#86">86</a> assertOpen();<a name="87" href="#87">87</a> <strong>boolean</strong> success = <strong>true</strong>;<a name="88" href="#88">88</a> <strong>if</strong>(!(_factory.validateObject(obj))) {<a name="89" href="#89">89</a> success = false;<a name="90" href="#90">90</a> } <strong>else</strong> {<a name="91" href="#91">91</a> <strong>try</strong> {<a name="92" href="#92">92</a> _factory.passivateObject(obj);⌨️ 快捷键说明
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