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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=UTF-8" /><title>JEApplicationMBean xref</title><link type="text/css" rel="stylesheet" href="../../../stylesheet.css" /></head><body><div id="overview"><a href="../../../../apidocs/org/archive/util/JEApplicationMBean.html">View Javadoc</a></div><pre><a name="1" href="#1">1</a> <em class="comment">/*<em class="comment">-</em></em><a name="2" href="#2">2</a> <em class="comment">* See the file LICENSE for redistribution information.</em><a name="3" href="#3">3</a> <em class="comment">*</em><a name="4" href="#4">4</a> <em class="comment">* Copyright (c) 2002-2005</em><a name="5" href="#5">5</a> <em class="comment">* Sleepycat Software. All rights reserved.</em><a name="6" href="#6">6</a> <em class="comment">*</em><a name="7" href="#7">7</a> <em class="comment">* $Id: JEApplicationMBean.java,v 1.1 2005/06/22 01:23:22 stack-sf Exp $</em><a name="8" href="#8">8</a> <em class="comment">*/</em><a name="9" href="#9">9</a> <a name="10" href="#10">10</a> <strong>package</strong> <a href="../../../org/archive/util/package-summary.html">org.archive.util</a>;<a name="11" href="#11">11</a> <a name="12" href="#12">12</a> <strong>import</strong> java.lang.reflect.Constructor;<a name="13" href="#13">13</a> <strong>import</strong> java.util.List;<a name="14" href="#14">14</a> <a name="15" href="#15">15</a> <strong>import</strong> javax.management.Attribute;<a name="16" href="#16">16</a> <strong>import</strong> javax.management.AttributeList;<a name="17" href="#17">17</a> <strong>import</strong> javax.management.AttributeNotFoundException;<a name="18" href="#18">18</a> <strong>import</strong> javax.management.DynamicMBean;<a name="19" href="#19">19</a> <strong>import</strong> javax.management.InvalidAttributeValueException;<a name="20" href="#20">20</a> <strong>import</strong> javax.management.MBeanAttributeInfo;<a name="21" href="#21">21</a> <strong>import</strong> javax.management.MBeanConstructorInfo;<a name="22" href="#22">22</a> <strong>import</strong> javax.management.MBeanException;<a name="23" href="#23">23</a> <strong>import</strong> javax.management.MBeanInfo;<a name="24" href="#24">24</a> <strong>import</strong> javax.management.MBeanNotificationInfo;<a name="25" href="#25">25</a> <strong>import</strong> javax.management.MBeanOperationInfo;<a name="26" href="#26">26</a> <a name="27" href="#27">27</a> <strong>import</strong> com.sleepycat.je.DatabaseException;<a name="28" href="#28">28</a> <strong>import</strong> com.sleepycat.je.Environment;<a name="29" href="#29">29</a> <a name="30" href="#30">30</a> <em>/**<em>*</em></em><a name="31" href="#31">31</a> <em> * JEApplicationMBean is an example of how a JE application can incorporate JE</em><a name="32" href="#32">32</a> <em> * monitoring into its existing MBean. It may be installed as is, or used as a</em><a name="33" href="#33">33</a> <em> * starting point for building a MBean which includes JE support.</em><a name="34" href="#34">34</a> <em> * <p></em><a name="35" href="#35">35</a> <em> * JE management is divided between the JEApplicationMBean class and</em><a name="36" href="#36">36</a> <em> * JEMBeanHelper class. JEApplicationMBean contains an instance of</em><a name="37" href="#37">37</a> <em> * JEMBeanHelper, which knows about JE attributes, operations and</em><a name="38" href="#38">38</a> <em> * notifications. JEApplicationMBean itself has the responsibility of</em><a name="39" href="#39">39</a> <em> * configuring, opening and closing the JE environment along with any other</em><a name="40" href="#40">40</a> <em> * resources used by the application, and maintains a</em><a name="41" href="#41">41</a> <em> * com.sleepycat.je.Environment handle.</em><a name="42" href="#42">42</a> <em> * <p></em><a name="43" href="#43">43</a> <em> * The approach taken for accessing the environment is an application specific</em><a name="44" href="#44">44</a> <em> * choice. Some of the salient considerations are:</em><a name="45" href="#45">45</a> <em> * <ul></em><a name="46" href="#46">46</a> <em> * <li>Applications may open one or many Environment objects per process </em><a name="47" href="#47">47</a> <em> * against a given environment.</li> </em><a name="48" href="#48">48</a> <em> *</em><a name="49" href="#49">49</a> <em> * <li>All Environment handles reference the same underlying JE environment</em><a name="50" href="#50">50</a> <em> * implementation object.</li></em><a name="51" href="#51">51</a> <a name="52" href="#52">52</a> <em> * <li> The first Environment object instantiated in the process does the real</em><a name="53" href="#53">53</a> <em> * work of configuring and opening the environment. Follow-on instantiations of</em><a name="54" href="#54">54</a> <em> * Environment merely increment a reference count. Likewise,</em><a name="55" href="#55">55</a> <em> * Environment.close() only does real work when it's called by the last</em><a name="56" href="#56">56</a> <em> * Environment object in the process. </li></em><a name="57" href="#57">57</a> <em> * </ul></em><a name="58" href="#58">58</a> <em> * <p></em><a name="59" href="#59">59</a> <em> * Another MBean approach for environment access can be seen in</em><a name="60" href="#60">60</a> <em> * com.sleepycat.je.jmx.JEMonitor. That MBean does not take responsibility for</em><a name="61" href="#61">61</a> <em> * opening and closing environments, and can only operate against already-open</em><a name="62" href="#62">62</a> <em> * environments.</em><a name="63" href="#63">63</a> <em> * <p>This bean was copied from bdb je 2.0 source and modified so could pass</em><a name="64" href="#64">64</a> <em> * in and monitor an environment created externally. Also added toString</em><a name="65" href="#65">65</a> <em> * versions of the locks and stats calls since the objects don't seem to</em><a name="66" href="#66">66</a> <em> * make it over the RMI divide (Not serializable. St.Ack</em><a name="67" href="#67">67</a> <em> */</em><a name="68" href="#68">68</a> <a name="69" href="#69">69</a> <strong>public</strong> <strong>class</strong> <a href="../../../org/archive/util/JEApplicationMBean.html">JEApplicationMBean</a> implements DynamicMBean {<a name="70" href="#70">70</a> <a name="71" href="#71">71</a> <strong>private</strong> <strong>static</strong> <strong>final</strong> String DESCRIPTION = <a name="72" href="#72">72</a> <span class="string">"A MBean for an application which uses JE. Provides open and close "</span> +<a name="73" href="#73">73</a> <span class="string">"operations which configure and open a JE environment as part of the "</span>+<a name="74" href="#74">74</a> <span class="string">"applications's resources. Also supports general JE monitoring."</span>;<a name="75" href="#75">75</a> <a name="76" href="#76">76</a> <strong>private</strong> MBeanInfo mbeanInfo; <em class="comment">// this MBean's visible interface.</em><a name="77" href="#77">77</a> <strong>private</strong> <a href="../../../org/archive/util/JEMBeanHelper.html">JEMBeanHelper</a> jeHelper; <em class="comment">// gets JE management interface</em><a name="78" href="#78">78</a> <strong>private</strong> Environment targetEnv; <em class="comment">// saved environment handle</em><a name="79" href="#79">79</a> <a name="80" href="#80">80</a> <em>/**<em>*</em></em><a name="81" href="#81">81</a> <em> * This MBean provides an open operation to open the JE environment.</em><a name="82" href="#82">82</a> <em> */</em><a name="83" href="#83">83</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String OP_OPEN = <span class="string">"openJE"</span>;<a name="84" href="#84">84</a> <a name="85" href="#85">85</a> <em>/**<em>*</em></em><a name="86" href="#86">86</a> <em> * This MBean provides a close operation to release the JE environment.</em><a name="87" href="#87">87</a> <em> * Note that environments must be closed to release resources.</em><a name="88" href="#88">88</a> <em> */</em><a name="89" href="#89">89</a> <strong>public</strong> <strong>static</strong> <strong>final</strong> String OP_CLOSE = <span class="string">"closeJE"</span>;<a name="90" href="#90">90</a> <a name="91" href="#91">91</a> <em>/**<em>*</em></em><a name="92" href="#92">92</a> <em> * Instantiate a JEApplicationMBean</em><a name="93" href="#93">93</a> <em> *</em><a name="94" href="#94">94</a> <em> * @param env Environment to use. Externally managed.</em><a name="95" href="#95">95</a> <em> * @throws DatabaseException</em><a name="96" href="#96">96</a> <em> */</em><a name="97" href="#97">97</a> <strong>public</strong> <a href="../../../org/archive/util/JEApplicationMBean.html">JEApplicationMBean</a>(Environment env) throws DatabaseException {<a name="98" href="#98">98</a> <strong>this</strong>.targetEnv = env;<a name="99" href="#99">99</a> jeHelper = <strong>new</strong> <a href="../../../org/archive/util/JEMBeanHelper.html">JEMBeanHelper</a>(env.getConfig(), env.getHome(), <strong>true</strong>);<a name="100" href="#100">100</a> resetMBeanInfo();<a name="101" href="#101">101</a> }<a name="102" href="#102">102</a> <a name="103" href="#103">103</a> <em>/**<em>*</em></em><a name="104" href="#104">104</a> <em> * @see DynamicMBean#getAttribute</em><a name="105" href="#105">105</a> <em> */</em><a name="106" href="#106">106</a> <strong>public</strong> Object getAttribute(String attributeName)<a name="107" href="#107">107</a> throws AttributeNotFoundException,<a name="108" href="#108">108</a> MBeanException {<a name="109" href="#109">109</a> <a name="110" href="#110">110</a> <strong>return</strong> jeHelper.getAttribute(targetEnv, attributeName);<a name="111" href="#111">111</a> }<a name="112" href="#112">112</a> <a name="113" href="#113">113</a> <em>/**<em>*</em></em><a name="114" href="#114">114</a> <em> * @see DynamicMBean#setAttribute</em><a name="115" href="#115">115</a> <em> */</em><a name="116" href="#116">116</a> <strong>public</strong> <strong>void</strong> setAttribute(Attribute attribute)<a name="117" href="#117">117</a> throws AttributeNotFoundException,<a name="118" href="#118">118</a> InvalidAttributeValueException {<a name="119" href="#119">119</a> <a name="120" href="#120">120</a> jeHelper.setAttribute(targetEnv, attribute);<a name="121" href="#121">121</a> }<a name="122" href="#122">122</a> <a name="123" href="#123">123</a> <em>/**<em>*</em></em><a name="124" href="#124">124</a> <em> * @see DynamicMBean#getAttributes</em><a name="125" href="#125">125</a> <em> */</em><a name="126" href="#126">126</a> <strong>public</strong> AttributeList getAttributes(String[] attributes) {<a name="127" href="#127">127</a> <a name="128" href="#128">128</a> <em class="comment">/*<em class="comment"> Sanity checking. */</em></em><a name="129" href="#129">129</a> <strong>if</strong> (attributes == <strong>null</strong>) {<a name="130" href="#130">130</a> <strong>throw</strong> <strong>new</strong> IllegalArgumentException(<span class="string">"Attributes cannot be null"</span>);<a name="131" href="#131">131</a> }<a name="132" href="#132">132</a> <a name="133" href="#133">133</a> <em class="comment">/*<em class="comment"> Get each requested attribute. */</em></em><a name="134" href="#134">134</a> AttributeList results = <strong>new</strong> AttributeList();<a name="135" href="#135">135</a> <strong>for</strong> (<strong>int</strong> i = 0; i < attributes.length; i++) {<a name="136" href="#136">136</a> <strong>try</strong> {<a name="137" href="#137">137</a> String name = attributes[i];<a name="138" href="#138">138</a> Object value = jeHelper.getAttribute(targetEnv, name);<a name="139" href="#139">139</a> results.add(<strong>new</strong> Attribute(name, value));<a name="140" href="#140">140</a> } <strong>catch</strong> (Exception e) {<a name="141" href="#141">141</a> e.printStackTrace();<a name="142" href="#142">142</a> }<a name="143" href="#143">143</a> }<a name="144" href="#144">144</a> <strong>return</strong> results;<a name="145" href="#145">145</a> }<a name="146" href="#146">146</a> <a name="147" href="#147">147</a> <em>/**<em>*</em></em><a name="148" href="#148">148</a> <em> * @see DynamicMBean#setAttributes</em><a name="149" href="#149">149</a> <em> */</em><a name="150" href="#150">150</a> <strong>public</strong> AttributeList setAttributes(AttributeList attributes) {<a name="151" href="#151">151</a> <a name="152" href="#152">152</a> <em class="comment">/*<em class="comment"> Sanity checking. */</em></em><a name="153" href="#153">153</a> <strong>if</strong> (attributes == <strong>null</strong>) {<a name="154" href="#154">154</a> <strong>throw</strong> <strong>new</strong> IllegalArgumentException(<span class="string">"attribute list can't be null"</span>);<a name="155" href="#155">155</a> }<a name="156" href="#156">156</a> <a name="157" href="#157">157</a> <em class="comment">/*<em class="comment"> Set each attribute specified. */</em></em><a name="158" href="#158">158</a> AttributeList results = <strong>new</strong> AttributeList();<a name="159" href="#159">159</a> <strong>for</strong> (<strong>int</strong> i = 0; i < attributes.size(); i++) {<a name="160" href="#160">160</a> Attribute attr = (Attribute) attributes.get(i);<a name="161" href="#161">161</a> <strong>try</strong> {<a name="162" href="#162">162</a> <em class="comment">/*<em class="comment"> Set new value. */</em></em><a name="163" href="#163">163</a> jeHelper.setAttribute(targetEnv, attr);⌨️ 快捷键说明
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