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| <h1>Reload Persistence Unit Properties |
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| <p>This example aims to simulate a benchmark campaign on JPA.</p> |
| |
| <p>First you'll run your application then you'll realize you could need L2 cache to respect your SLA.</p> |
| |
| <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> |
| |
| <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> |
| |
| <p>To do it we can simply use JMX.</p> |
| |
| <p>OpenEJB automatically register one MBeans by entitymanager (persistence unit).</p> |
| |
| <p>It allows you mainly to change your persistence unit properties even if more is possible.</p> |
| |
| <h2>The test itself</h2> |
| |
| <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> |
| |
| <h1>The output</h1> |
| |
| <p>In the ouput we find the 3 parts described just before.</p> |
| |
| <pre><code>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> |
| |
| |
| <div class="page-header"> </div> |
| <h4>APIs Used</h4> |
| <ul><li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/EJB.html">javax.ejb.EJB</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/Singleton.html">javax.ejb.Singleton</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/TransactionAttribute.html">javax.ejb.TransactionAttribute</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/TransactionAttributeType.html">javax.ejb.TransactionAttributeType</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/ejb/embeddable/EJBContainer.html">javax.ejb.embeddable.EJBContainer</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/management/MBeanServer.html">javax.management.MBeanServer</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/management/ObjectName.html">javax.management.ObjectName</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/naming/NamingException.html">javax.naming.NamingException</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/Entity.html">javax.persistence.Entity</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/EntityManager.html">javax.persistence.EntityManager</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/EntityManagerFactory.html">javax.persistence.EntityManagerFactory</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/Id.html">javax.persistence.Id</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/PersistenceContext.html">javax.persistence.PersistenceContext</a></li> |
| <li><a href="http://docs.oracle.com/javaee/6/api/javax/persistence/PersistenceUnit.html">javax.persistence.PersistenceUnit</a></li> |
| </ul> |
| |
| <h3>Source</h3> |
| <ul> |
| <li>Apache <a href="http://svn.apache.org/repos/asf/tomee/tomee//examples/reload-persistence-unit-properties">reload-persistence-unit-properties</a></li> |
| <li>Github <a href="https://github.com/apache/tomee/tree//examples/reload-persistence-unit-properties">reload-persistence-unit-properties</a></li> |
| </ul> |
| <pre> |
| svn co http://svn.apache.org/repos/asf/tomee/tomee//examples/reload-persistence-unit-properties |
| cd reload-persistence-unit-properties |
| mvn clean install |
| </pre> |
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