jembeanhelper.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="262" href="#262">262</a>                                statParams,
<a name="263" href="#263">263</a>                                <span class="string">"com.sleepycat.je.EnvironmentStats"</span>,
<a name="264" href="#264">264</a>                                MBeanOperationInfo.INFO);
<a name="265" href="#265">265</a>     
<a name="266" href="#266">266</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MBeanOperationInfo OP_ENV_STAT_STR_INFO = 
<a name="267" href="#267">267</a>         <strong>new</strong> MBeanOperationInfo(OP_ENV_STAT_STR,
<a name="268" href="#268">268</a>                                <span class="string">"Get environment statistics."</span>,
<a name="269" href="#269">269</a>                                statParams,
<a name="270" href="#270">270</a>                                <span class="string">"java.lang.String"</span>,
<a name="271" href="#271">271</a>                                MBeanOperationInfo.INFO);
<a name="272" href="#272">272</a> 
<a name="273" href="#273">273</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MBeanOperationInfo OP_LOCK_STAT_INFO = 
<a name="274" href="#274">274</a>         <strong>new</strong> MBeanOperationInfo(OP_LOCK_STAT,
<a name="275" href="#275">275</a>                                <span class="string">"Get locking statistics."</span>,
<a name="276" href="#276">276</a>                                statParams,
<a name="277" href="#277">277</a>                                <span class="string">"com.sleepycat.je.LockStats"</span>,
<a name="278" href="#278">278</a>                                MBeanOperationInfo.INFO);
<a name="279" href="#279">279</a>     
<a name="280" href="#280">280</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MBeanOperationInfo OP_LOCK_STAT_STR_INFO = 
<a name="281" href="#281">281</a>         <strong>new</strong> MBeanOperationInfo(OP_LOCK_STAT_STR,
<a name="282" href="#282">282</a>                                <span class="string">"Get locking statistics."</span>,
<a name="283" href="#283">283</a>                                statParams,
<a name="284" href="#284">284</a>                                <span class="string">"java.lang.String"</span>,
<a name="285" href="#285">285</a>                                MBeanOperationInfo.INFO);
<a name="286" href="#286">286</a> 
<a name="287" href="#287">287</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MBeanOperationInfo OP_TXN_STAT_INFO = 
<a name="288" href="#288">288</a>         <strong>new</strong> MBeanOperationInfo(OP_TXN_STAT,
<a name="289" href="#289">289</a>                                <span class="string">"Get transactional statistics."</span>,
<a name="290" href="#290">290</a>                                statParams,
<a name="291" href="#291">291</a>                                <span class="string">"com.sleepycat.je.TransactionStats"</span>,
<a name="292" href="#292">292</a>                                MBeanOperationInfo.INFO);
<a name="293" href="#293">293</a> 
<a name="294" href="#294">294</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MBeanOperationInfo OP_DB_NAMES_INFO = 
<a name="295" href="#295">295</a>         <strong>new</strong> MBeanOperationInfo(OP_DB_NAMES,
<a name="296" href="#296">296</a>                               <span class="string">"Get the names of databases in the environment."</span>,
<a name="297" href="#297">297</a>                                <strong>new</strong> MBeanParameterInfo[0], <em class="comment">// no params</em>
<a name="298" href="#298">298</a>                                <span class="string">"java.lang.String"</span>,
<a name="299" href="#299">299</a>                                MBeanOperationInfo.INFO);
<a name="300" href="#300">300</a> 
<a name="301" href="#301">301</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MBeanOperationInfo OP_DB_STAT_INFO = 
<a name="302" href="#302">302</a>         <strong>new</strong> MBeanOperationInfo(OP_DB_STAT,
<a name="303" href="#303">303</a>                                <span class="string">"Get database statistics."</span>,
<a name="304" href="#304">304</a>                                statParams,
<a name="305" href="#305">305</a>                                <span class="string">"com.sleepycat.je.TransactionStats"</span>,
<a name="306" href="#306">306</a>                                MBeanOperationInfo.INFO);
<a name="307" href="#307">307</a> 
<a name="308" href="#308">308</a>     <strong>private</strong> <strong>static</strong> <strong>final</strong> MBeanParameterInfo [] dbStatParams = {
<a name="309" href="#309">309</a>         <strong>new</strong> MBeanParameterInfo (<span class="string">"clear"</span>, <span class="string">"java.lang.Boolean"</span>,
<a name="310" href="#310">310</a>                                 <span class="string">"If true, reset statistics after reading."</span>),
<a name="311" href="#311">311</a>         <strong>new</strong> MBeanParameterInfo (<span class="string">"fast"</span>, <span class="string">"java.lang.Boolean"</span>,
<a name="312" href="#312">312</a>                                 <span class="string">"If true, only return statistics which do "</span> +
<a name="313" href="#313">313</a>                                 <span class="string">"not require expensive computation."</span>),
<a name="314" href="#314">314</a>         <strong>new</strong> MBeanParameterInfo (<span class="string">"databaseName"</span>, <span class="string">"java.lang.String"</span>,
<a name="315" href="#315">315</a>                                 <span class="string">"database name"</span>)
<a name="316" href="#316">316</a> 
<a name="317" href="#317">317</a>     };
<a name="318" href="#318">318</a> 
<a name="319" href="#319">319</a>     <em class="comment">/*<em class="comment"> target JE environment home directory. */</em></em>
<a name="320" href="#320">320</a>     <strong>private</strong> File environmentHome;  
<a name="321" href="#321">321</a> 
<a name="322" href="#322">322</a>     <em class="comment">/*<em class="comment"> </em></em>
<a name="323" href="#323">323</a> <em class="comment">     * If canConfigure is true, this helper will make environment configuration</em>
<a name="324" href="#324">324</a> <em class="comment">     * attributes available in the mbean metadata. Configuration attributes</em>
<a name="325" href="#325">325</a> <em class="comment">     * will be saved in the openConfig instance.</em>
<a name="326" href="#326">326</a> <em class="comment">     */</em>
<a name="327" href="#327">327</a>     <strong>private</strong> <strong>boolean</strong> canConfigure;
<a name="328" href="#328">328</a>     <strong>private</strong> EnvironmentConfig openConfig;
<a name="329" href="#329">329</a> 
<a name="330" href="#330">330</a>     <em class="comment">/*<em class="comment"> true if the mbean metadata needs to be refreshed. */</em></em>
<a name="331" href="#331">331</a>     <strong>private</strong> <strong>boolean</strong> needReset;
<a name="332" href="#332">332</a> 
<a name="333" href="#333">333</a>     <em class="comment">/*</em>
<a name="334" href="#334">334</a> <em class="comment">     * Save whether the environment was open the last time we fetched</em>
<a name="335" href="#335">335</a> <em class="comment">     * mbean attributes. Use to detect a change in environment status.</em>
<a name="336" href="#336">336</a> <em class="comment">     */</em>
<a name="337" href="#337">337</a>     <strong>private</strong> <strong>boolean</strong> envWasOpen;
<a name="338" href="#338">338</a>     
<a name="339" href="#339">339</a>     <em>/**<em>*</em></em>
<a name="340" href="#340">340</a> <em>     * Instantiate a helper, specifying environment home and open capabilities.</em>
<a name="341" href="#341">341</a> <em>     *</em>
<a name="342" href="#342">342</a> <em>     * @param environmentHome home directory of the target JE environment.</em>
<a name="343" href="#343">343</a> <em>     * @param canConfigure If true, the helper will show environment</em>
<a name="344" href="#344">344</a> <em>     * configuration attributes.</em>
<a name="345" href="#345">345</a> <em>     */</em>
<a name="346" href="#346">346</a>     <strong>public</strong> <a href="../../../org/archive/util/JEMBeanHelper.html">JEMBeanHelper</a>(EnvironmentConfig config,
<a name="347" href="#347">347</a>             File environmentHome, <strong>boolean</strong> canConfigure) {
<a name="348" href="#348">348</a> 
<a name="349" href="#349">349</a>         <strong>if</strong> (environmentHome == <strong>null</strong>) {
<a name="350" href="#350">350</a>             <strong>throw</strong> <strong>new</strong> IllegalArgumentException(
<a name="351" href="#351">351</a>                                         <span class="string">"Environment home cannot be null"</span>);
<a name="352" href="#352">352</a>         }
<a name="353" href="#353">353</a>         <strong>this</strong>.environmentHome = environmentHome;
<a name="354" href="#354">354</a>         <strong>this</strong>.canConfigure = canConfigure;
<a name="355" href="#355">355</a>         <strong>if</strong> (canConfigure) {
<a name="356" href="#356">356</a>             openConfig = config;
<a name="357" href="#357">357</a>         }
<a name="358" href="#358">358</a>     }
<a name="359" href="#359">359</a> 
<a name="360" href="#360">360</a>     <em>/**<em>*</em></em>
<a name="361" href="#361">361</a> <em>     * Return the target environment directory. </em>
<a name="362" href="#362">362</a> <em>     * @return the environment directory.</em>
<a name="363" href="#363">363</a> <em>     */</em>
<a name="364" href="#364">364</a>     <strong>public</strong> File getEnvironmentHome() {
<a name="365" href="#365">365</a>         <strong>return</strong> environmentHome;
<a name="366" href="#366">366</a>     }
<a name="367" href="#367">367</a> 
<a name="368" href="#368">368</a>     <em>/**<em>*</em></em>
<a name="369" href="#369">369</a> <em>     * If the helper was instantiated with canConfigure==true, it shows</em>
<a name="370" href="#370">370</a> <em>     * environment configuration attributes. Those attributes are returned</em>
<a name="371" href="#371">371</a> <em>     * within this EnvironmentConfig object for use in opening environments.</em>
<a name="372" href="#372">372</a> <em>     * </em>
<a name="373" href="#373">373</a> <em>     * @return EnvironmentConfig object which saves configuration attributes</em>
<a name="374" href="#374">374</a> <em>     * recorded through MBean attributes.</em>
<a name="375" href="#375">375</a> <em>     */</em>
<a name="376" href="#376">376</a>     <strong>public</strong> EnvironmentConfig getEnvironmentOpenConfig() {
<a name="377" href="#377">377</a>         <strong>return</strong> openConfig;
<a name="378" href="#378">378</a>     }
<a name="379" href="#379">379</a> 
<a name="380" href="#380">380</a>     <em>/**<em>*</em></em>
<a name="381" href="#381">381</a> <em>     * Return an Environment only if the environment has already been opened</em>
<a name="382" href="#382">382</a> <em>     * in this process. A helper method for MBeans which want to only access</em>
<a name="383" href="#383">383</a> <em>     * open environments. </em>
<a name="384" href="#384">384</a> <em>     * @return Environment if already open, null if not open.</em>
<a name="385" href="#385">385</a> <em>     */</em>
<a name="386" href="#386">386</a>     <strong>public</strong> Environment getEnvironmentIfOpen() {
<a name="387" href="#387">387</a>         <strong>if</strong> (environmentHome == <strong>null</strong>) {
<a name="388" href="#388">388</a>             <strong>return</strong> <strong>null</strong>;
<a name="389" href="#389">389</a>         }
<a name="390" href="#390">390</a> 
<a name="391" href="#391">391</a>         <strong>return</strong> DbInternal.getEnvironmentShell(environmentHome);
<a name="392" href="#392">392</a>     }
<a name="393" href="#393">393</a> 
<a name="394" href="#394">394</a>     <em>/**<em>*</em></em>
<a name="395" href="#395">395</a> <em>     * Tell the MBean if the available set of functionality has changed.</em>
<a name="396" href="#396">396</a> <em>     *</em>