master/examples/reload-persistence-unit-properties.html - tomee-site-pub - Git at Google

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               <h1>Reload Persistence Unit Properties</h1>
             </div>
           </div>
         </div>
         <div class="row">

             <div class="col-md-12">
                 <div id="preamble">
 <div class="sectionbody">
 <div class="paragraph">
 <p>This example aims to simulate a benchmark campaign on JPA.</p>
 </div>
 <div class="paragraph">
 <p>First you’ll run your application then you’ll realize you need an L2
 cache to conform to your Service Level Agreement (SLA).</p>
 </div>
 <div class="paragraph">
 <p>So you change your persistence.xml configuration, then restart your
 application, you wait a bit because you are using OpenEJB ;)…but you
 wait…</p>
 </div>
 <div class="paragraph">
 <p>So to try to go faster on long campaign simply change your configuration
 at runtime to test it then when it works change your configuration file
 to keep the modification.</p>
 </div>
 <div class="paragraph">
 <p>To do it we can simply use JMX.</p>
 </div>
 <div class="paragraph">
 <p>OpenEJB automatically registers one MBean by entitymanager (persistence
 unit).</p>
 </div>
 <div class="paragraph">
 <p>It allows you to change your persistence unit properties even if more is
 possible.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_the_test_itself">The test itself</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>The test is simple: we persist an entity, we query it three times
 without cache then we activate cache and realize running again our
 queries that one is enough to do the same.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_the_output">The output</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>In the ouput we find the 3 parts described just before.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-java" data-lang="java">INFO - TEST, data initialization
 DEBUG - &lt;t 1523828380, conn 93608538&gt; executing stmnt 1615782385 CREATE TABLE Person (id BIGINT NOT NULL, name VARCHAR(255), PRIMARY KEY (id))
 DEBUG - &lt;t 1523828380, conn 93608538&gt; [1 ms] spent
 DEBUG - &lt;t 1523828380, conn 1506565411&gt; executing prepstmnt 668144844 INSERT INTO Person (id, name) VALUES (?, ?) [params=?, ?]
 DEBUG - &lt;t 1523828380, conn 1506565411&gt; [0 ms] spent
 INFO - TEST, end of data initialization


 INFO - TEST, doing some queries without cache
 DEBUG - &lt;t 1523828380, conn 1506565411&gt; executing prepstmnt 1093240870 SELECT t0.name FROM Person t0 WHERE t0.id = ? [params=?]
 DEBUG - &lt;t 1523828380, conn 1506565411&gt; [0 ms] spent
 DEBUG - &lt;t 1523828380, conn 1506565411&gt; executing prepstmnt 1983702821 SELECT t0.name FROM Person t0 WHERE t0.id = ? [params=?]
 DEBUG - &lt;t 1523828380, conn 1506565411&gt; [0 ms] spent
 DEBUG - &lt;t 1523828380, conn 1506565411&gt; executing prepstmnt 1178041898 SELECT t0.name FROM Person t0 WHERE t0.id = ? [params=?]
 DEBUG - &lt;t 1523828380, conn 1506565411&gt; [1 ms] spent
 INFO - TEST, queries without cache done


 INFO - TEST, doing some queries with cache
 DEBUG - &lt;t 1523828380, conn 1506565411&gt; executing prepstmnt 1532943889 SELECT t0.name FROM Person t0 WHERE t0.id = ? [params=?]
 DEBUG - &lt;t 1523828380, conn 1506565411&gt; [0 ms] spent
 INFO - TEST, queries with cache done</code></pre>
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	<h1>Reload Persistence Unit Properties</h1>
	</div>
	</div>
	</div>
	<div class="row">

	<div class="col-md-12">
	<div id="preamble">
	<div class="sectionbody">
	<div class="paragraph">
	<p>This example aims to simulate a benchmark campaign on JPA.</p>
	</div>
	<div class="paragraph">
	<p>First you’ll run your application then you’ll realize you need an L2
	cache to conform to your Service Level Agreement (SLA).</p>
	</div>
	<div class="paragraph">
	<p>So you change your persistence.xml configuration, then restart your
	application, you wait a bit because you are using OpenEJB ;)…but you
	wait…</p>
	</div>
	<div class="paragraph">
	<p>So to try to go faster on long campaign simply change your configuration
	at runtime to test it then when it works change your configuration file
	to keep the modification.</p>
	</div>
	<div class="paragraph">
	<p>To do it we can simply use JMX.</p>
	</div>
	<div class="paragraph">
	<p>OpenEJB automatically registers one MBean by entitymanager (persistence
	unit).</p>
	</div>
	<div class="paragraph">
	<p>It allows you to change your persistence unit properties even if more is
	possible.</p>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_the_test_itself">The test itself</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>The test is simple: we persist an entity, we query it three times
	without cache then we activate cache and realize running again our
	queries that one is enough to do the same.</p>
	</div>
	</div>
	</div>
	<div class="sect1">
	<h2 id="_the_output">The output</h2>
	<div class="sectionbody">
	<div class="paragraph">
	<p>In the ouput we find the 3 parts described just before.</p>
	</div>
	<div class="listingblock">
	<div class="content">
	<pre class="highlight"><code class="language-java" data-lang="java">INFO - TEST, data initialization
	DEBUG - <t 1523828380, conn 93608538> executing stmnt 1615782385 CREATE TABLE Person (id BIGINT NOT NULL, name VARCHAR(255), PRIMARY KEY (id))
	DEBUG - <t 1523828380, conn 93608538> [1 ms] spent
	DEBUG - <t 1523828380, conn 1506565411> executing prepstmnt 668144844 INSERT INTO Person (id, name) VALUES (?, ?) [params=?, ?]
	DEBUG - <t 1523828380, conn 1506565411> [0 ms] spent
	INFO - TEST, end of data initialization


	INFO - TEST, doing some queries without cache
	DEBUG - <t 1523828380, conn 1506565411> executing prepstmnt 1093240870 SELECT t0.name FROM Person t0 WHERE t0.id = ? [params=?]
	DEBUG - <t 1523828380, conn 1506565411> [0 ms] spent
	DEBUG - <t 1523828380, conn 1506565411> executing prepstmnt 1983702821 SELECT t0.name FROM Person t0 WHERE t0.id = ? [params=?]
	DEBUG - <t 1523828380, conn 1506565411> [0 ms] spent
	DEBUG - <t 1523828380, conn 1506565411> executing prepstmnt 1178041898 SELECT t0.name FROM Person t0 WHERE t0.id = ? [params=?]
	DEBUG - <t 1523828380, conn 1506565411> [1 ms] spent
	INFO - TEST, queries without cache done


	INFO - TEST, doing some queries with cache
	DEBUG - <t 1523828380, conn 1506565411> executing prepstmnt 1532943889 SELECT t0.name FROM Person t0 WHERE t0.id = ? [params=?]
	DEBUG - <t 1523828380, conn 1506565411> [0 ms] spent
	INFO - TEST, queries with cache done</code></pre>
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