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<h1>Injeção de Entitymanager</h1>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Este exemplo mostra o uso de <code>@PersistenceContext</code> para ter um <code>EntityManager</code> com um contexto de persistência <code>EXTENDED</code> injetado em um <code>@Stateful bean</code>. Um bean JPA <code>@ Entity</code> é usado com o <code>EntityManager</code> para criar, persistir e mesclar dados em um banco de dados.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_criando_a_entidade_jpa">Criando a entidade JPA</h2>
<div class="sectionbody">
<div class="paragraph">
<p>A própria entidade é simplesmente um pote anotado com <code>@Entity</code>. Criamos um chamado <code>Movie</code>, que podemos usar para armazenar registros de filmes.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection.jpa;
import jakarta.persistence.Entity;
@Entity
public class Movie {
@Id @GeneratedValue
private long id;
private String director;
private String title;
private int year;
public Movie() {
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public Movie(String director, String title, int year) {
this.director = director;
this.title = title;
this.year = year;
}
public String getDirector() {
return director;
}
public void setDirector(String director) {
this.director = director;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_configure_o_entitymanager_por_meio_de_um_arquivo_persistence_xml">Configure o EntityManager por meio de um arquivo persistence.xml</h2>
<div class="sectionbody">
<div class="paragraph">
<p>A entidade <code>Movie</code> acima pode ser criada, removida, atualizada ou excluída através de um objeto` EntityManager`.
O próprio <code>EntityManager</code> é configurado através de um arquivo <code>META-INF/persistence.xml</code> que é colocado no mesmo jar que a entidade <code>Movie</code>.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;persistence xmlns="http://java.sun.com/xml/ns/persistence" version="1.0"&gt;
&lt;persistence-unit name="movie-unit"&gt;
&lt;jta-data-source&gt;movieDatabase&lt;/jta-data-source&gt;
&lt;non-jta-data-source&gt;movieDatabaseUnmanaged&lt;/non-jta-data-source&gt;
&lt;class&gt;org.superbiz.injection.jpa.Movie&lt;/class&gt;
&lt;properties&gt;
&lt;property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)"/&gt;
&lt;/properties&gt;
&lt;/persistence-unit&gt;
&lt;/persistence&gt;</code></pre>
</div>
</div>
<div class="paragraph">
<p>Observe que a entidade <code>Movie</code> é listada através de um elemento <code>&lt;class&gt;</code>. Isso não é necessário, mas pode ajudar no teste ou quando a classe <code>Movie</code> estiver localizada em um jar diferente do jar que contém o arquivo <code>persistence.xml</code>.</p>
</div>
<div class="paragraph">
<p>==Injeção via @PersistenceContext</p>
</div>
<div class="paragraph">
<p>O próprio <code>EntityManager</code> é criado pelo contêiner usando as informações no <code>persistence.xml</code>, portanto, para usá-lo em tempo de execução, basta solicitar que ele seja injetado em um de nossos componentes. Fazemos isso via <code>@PersistenceContext</code></p>
</div>
<div class="paragraph">
<p>A anotação <code>@PersistenceContext</code> pode ser usada em qualquer bean CDI, EJB, Servlet, Servlet Listener, Servlet Filter ou JSF ManagedBean. Se você não usar um EJB, precisará usar um <code>UserTransaction</code> para iniciar e confirmar transações manualmente. É necessária uma transação para que qualquer um dos métodos de criação, atualização ou exclusão do EntityManager funcione.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection.jpa;
import jakarta.ejb.Stateful;
import jakarta.persistence.EntityManager;
import jakarta.persistence.PersistenceContext;
import jakarta.persistence.PersistenceContextType;
import jakarta.persistence.Query;
import java.util.List;
@Stateful
public class Movies {
@PersistenceContext(unitName = "movie-unit", type = PersistenceContextType.EXTENDED)
private EntityManager entityManager;
public void addMovie(Movie movie) throws Exception {
entityManager.persist(movie);
}
public void deleteMovie(Movie movie) throws Exception {
entityManager.remove(movie);
}
public List&lt;Movie&gt; getMovies() throws Exception {
Query query = entityManager.createQuery("SELECT m from Movie as m");
return query.getResultList();
}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Este <code>EntityManager</code> específico é injetado como um contexto de persistência <code>EXTENDED</code>, o que significa simplesmente que o <code>EntityManager</code> é criado quando o bean <code>@Stateful</code> é criado e destruído quando o bean <code>@Stateful</code> é destruído. Simplificando, os dados no <code>EntityManager</code> são armazenados em cache durante o tempo de vida do bean <code>@ Stateful</code>.</p>
</div>
<div class="paragraph">
<p>O uso de contextos de persistência <code>EXTENDED</code> está <strong>apenas</strong> disponível para beans <code>@Stateful</code>. Consulte o link: ../../jpa-concepts.html [Conceitos da JPA] para obter uma explicação de alto nível sobre o que realmente é um "contexto de persistência" e como é significativo para a JPA.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_moviestest">MoviesTest</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Testar o JPA é bastante fácil, podemos simplesmente usar a API <code>EJBContainer</code> para criar um contêiner em nosso caso de teste.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.injection.jpa;
import junit.framework.TestCase;
import jakarta.ejb.embeddable.EJBContainer;
import javax.naming.Context;
import java.util.List;
import java.util.Properties;
public class MoviesTest extends TestCase {
public void test() throws Exception {
final Properties p = new Properties();
p.put("movieDatabase", "new://Resource?type=DataSource");
p.put("movieDatabase.JdbcDriver", "org.hsqldb.jdbcDriver");
p.put("movieDatabase.JdbcUrl", "jdbc:hsqldb:mem:moviedb");
final Context context = EJBContainer.createEJBContainer(p).getContext();
Movies movies = (Movies) context.lookup("java:global/injection-of-entitymanager/Movies");
movies.addMovie(new Movie("Quentin Tarantino", "Reservoir Dogs", 1992));
movies.addMovie(new Movie("Joel Coen", "Fargo", 1996));
movies.addMovie(new Movie("Joel Coen", "The Big Lebowski", 1998));
List&lt;Movie&gt; list = movies.getMovies();
assertEquals("List.size()", 3, list.size());
for (Movie movie : list) {
movies.deleteMovie(movie);
}
assertEquals("Movies.getMovies()", 0, movies.getMovies().size());
}
}</code></pre>
</div>
</div>
</div>
</div>
<h1 id="_executando" class="sect0">Executando</h1>
<div class="paragraph">
<p>Quando executamos nosso caso de teste, devemos ver uma saída semelhante à seguinte.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-console" data-lang="console">-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running org.superbiz.injection.jpa.MoviesTest
Apache OpenEJB 4.0.0-beta-1 build: 20111002-04:06
http://tomee.apache.org/
INFO - openejb.home = /Users/dblevins/examples/injection-of-entitymanager
INFO - openejb.base = /Users/dblevins/examples/injection-of-entitymanager
INFO - Using 'jakarta.ejb.embeddable.EJBContainer=true'
INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service)
INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager)
INFO - Configuring Service(id=movieDatabase, type=Resource, provider-id=Default JDBC Database)
INFO - Found EjbModule in classpath: /Users/dblevins/examples/injection-of-entitymanager/target/classes
INFO - Beginning load: /Users/dblevins/examples/injection-of-entitymanager/target/classes
INFO - Configuring enterprise application: /Users/dblevins/examples/injection-of-entitymanager
INFO - Configuring Service(id=Default Stateful Container, type=Container, provider-id=Default Stateful Container)
INFO - Auto-creating a container for bean Movies: Container(type=STATEFUL, id=Default Stateful Container)
INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
INFO - Auto-creating a container for bean org.superbiz.injection.jpa.MoviesTest: Container(type=MANAGED, id=Default Managed Container)
INFO - Configuring PersistenceUnit(name=movie-unit)
INFO - Auto-creating a Resource with id 'movieDatabaseNonJta' of type 'DataSource for 'movie-unit'.
INFO - Configuring Service(id=movieDatabaseNonJta, type=Resource, provider-id=movieDatabase)
INFO - Adjusting PersistenceUnit movie-unit &lt;non-jta-data-source&gt; to Resource ID 'movieDatabaseNonJta' from 'movieDatabaseUnmanaged'
INFO - Enterprise application "/Users/dblevins/examples/injection-of-entitymanager" loaded.
INFO - Assembling app: /Users/dblevins/examples/injection-of-entitymanager
INFO - PersistenceUnit(name=movie-unit, provider=org.apache.openjpa.persistence.PersistenceProviderImpl) - provider time 462ms
INFO - Jndi(name="java:global/injection-of-entitymanager/Movies!org.superbiz.injection.jpa.Movies")
INFO - Jndi(name="java:global/injection-of-entitymanager/Movies")
INFO - Jndi(name="java:global/EjbModule1461341140/org.superbiz.injection.jpa.MoviesTest!org.superbiz.injection.jpa.MoviesTest")
INFO - Jndi(name="java:global/EjbModule1461341140/org.superbiz.injection.jpa.MoviesTest")
INFO - Created Ejb(deployment-id=Movies, ejb-name=Movies, container=Default Stateful Container)
INFO - Created Ejb(deployment-id=org.superbiz.injection.jpa.MoviesTest, ejb-name=org.superbiz.injection.jpa.MoviesTest, container=Default Managed Container)
INFO - Started Ejb(deployment-id=Movies, ejb-name=Movies, container=Default Stateful Container)
INFO - Started Ejb(deployment-id=org.superbiz.injection.jpa.MoviesTest, ejb-name=org.superbiz.injection.jpa.MoviesTest, container=Default Managed Container)
INFO - Deployed Application(path=/Users/dblevins/examples/injection-of-entitymanager)
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.301 sec
Results :
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0</code></pre>
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