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| |
| <h1>Recarregar propriedades do persistence unit</h1> |
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| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Este exemplo tem como objetivo simular uma campanha de benchmark no JPA.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Primeiro, você executará seu aplicativo e perceberá que precisa de um L2 |
| cache para estar em conformidade com o SLA (Service Level Agreement).</p> |
| </div> |
| <div class="paragraph"> |
| <p>Então, você altera sua configuração persistence.xml e reinicia sua |
| aplicação, você espera um pouco porque está usando o OpenEJB;)… mas você |
| espera.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Portanto, para tentar ir mais rápido em uma campanha longa, basta alterar sua configuração em tempo de execução para testá-la e, quando funcionar, alterar seu arquivo de configuração para manter a modificação.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Para fazer isso, podemos simplesmente usar o JMX.</p> |
| </div> |
| <div class="paragraph"> |
| <p>O OpenEJB registra automaticamente um MBean por entitymanager (persistence unit).</p> |
| </div> |
| <div class="paragraph"> |
| <p>Ele permite que você altere as propriedades do persistence unit, mesmo que mais seja possível.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_testando">Testando</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>O teste é simples: persistimos uma entidade, a consultamos três vezes |
| sem cache, então ativamos o cache e realizamos a execução novamente |
| consulta que um é suficiente para fazer o mesmo.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_saída">Saída</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Na saída, encontramos as 3 partes descritas antes.</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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| <div class="sect1"> |
| <h2 id="_apis_used">APIs Used</h2> |
| <div class="sectionbody"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="../../../tomee-9.0/javadoc/org/apache/openejb/monitoring/LocalMBeanServer.html">org.apache.openejb.monitoring.LocalMBeanServer</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/ejb/EJB.html">jakarta.ejb.EJB</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/ejb/Singleton.html">jakarta.ejb.Singleton</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/ejb/TransactionAttribute.html">jakarta.ejb.TransactionAttribute</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/ejb/TransactionAttributeType.html">jakarta.ejb.TransactionAttributeType</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/ejb/embeddable/EJBContainer.html">jakarta.ejb.embeddable.EJBContainer</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/persistence/Entity.html">jakarta.persistence.Entity</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/persistence/EntityManager.html">jakarta.persistence.EntityManager</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/persistence/EntityManagerFactory.html">jakarta.persistence.EntityManagerFactory</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/persistence/Id.html">jakarta.persistence.Id</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/persistence/PersistenceContext.html">jakarta.persistence.PersistenceContext</a></p> |
| </li> |
| <li> |
| <p><a href="../../../jakartaee-10.0/javadoc/jakarta/persistence/PersistenceUnit.html">jakarta.persistence.PersistenceUnit</a></p> |
| </li> |
| </ul> |
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