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<h1>Roteamento dinâmico de fonte de dados</h1>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>A API de fonte de dados dinâmica do TomEE visa permitir o uso de várias fontes de dados como se fosse uma do ponto de vista do aplicativo.</p>
</div>
<div class="paragraph">
<p>Pode ser útil por razões técnicas (balanceamento de carga, por exemplo) ou
razões geralmente mais funcionais (filtragem, agregação, enriquecimento &#8230;&#8203;).
No entanto, observe que você pode escolher apenas uma fonte de dados por transação.
Isso significa que o objetivo desse recurso não é alternar mais de uma vez
fonte de dados em uma transação. O código a seguir não funcionará:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Stateless
public class MyEJB {
@Resource private MyRouter router;
@PersistenceContext private EntityManager em;
public void workWithDataSources() {
router.setDataSource("ds1");
em.persist(new MyEntity());
router.setDataSource("ds2"); // mesma transação -&gt; esta invocação não funciona
em.persist(new MyEntity());
}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Neste exemplo, a implementação simplesmente usa uma fonte de dados de seu nome
e precisa ser definido antes de usar qualquer operação JPA na transação
(para manter a lógica simples no exemplo).</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_a_implementação_do_roteador">A implementação do roteador</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Nosso roteador possui dois parâmetros de configuração: <strong>uma lista de nomes jndi
representando fontes de dados para usar</strong> uma fonte de dados padrão para usar</p>
</div>
<div class="sect2">
<h3 id="_implementação_de_roteador">Implementação de roteador</h3>
<div class="paragraph">
<p>A interface Router (<code>org.apache.openejb.resource.jdbc.Router</code>) tem
somente um método para implementar, <code>public DataSource getDataSource()</code></p>
</div>
<div class="paragraph">
<p>Nossa implementação <code>DeterminedRouter</code> usa um ThreadLocal para gerenciar a
fonte de dados usada atualmente. Lembre-se de que a JPA usou mais de uma vez o
Método getDatasource() para uma operação. Alterar a fonte de dados em
uma transação é perigosa e deve ser evitada.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.dynamicdatasourcerouting;
import org.apache.openejb.resource.jdbc.AbstractRouter;
import javax.naming.NamingException;
import javax.sql.DataSource;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class DeterminedRouter extends AbstractRouter {
private String dataSourceNames;
private String defaultDataSourceName;
private Map&lt;String, DataSource&gt; dataSources = null;
private ThreadLocal&lt;DataSource&gt; currentDataSource = new ThreadLocal&lt;DataSource&gt;();
/**
* @param datasourceList nome do recurso de origem de dados, separador é um espaço
*/
public void setDataSourceNames(String datasourceList) {
dataSourceNames = datasourceList;
}
/**
* fonte de dados de pesquisa em recursos openejb
*/
private void init() {
dataSources = new ConcurrentHashMap&lt;String, DataSource&gt;();
for (String ds : dataSourceNames.split(" ")) {
try {
Object o = getOpenEJBResource(ds);
if (o instanceof DataSource) {
dataSources.put(ds, DataSource.class.cast(o));
}
} catch (NamingException e) {
// ignorado
}
}
}
/**
* @return o usuário selecionou a fonte de dados, se estiver definida
      * ou o padrão
* @throws IllegalArgumentException se a fonte de dados não for encontrada
*/
@Override
public DataSource getDataSource() {
// lazy init of routed datasources
if (dataSources == null) {
init();
}
// se nenhuma fonte de dados estiver selecionada, use a fonte padrão
if (currentDataSource.get() == null) {
if (dataSources.containsKey(defaultDataSourceName)) {
return dataSources.get(defaultDataSourceName);
} else {
throw new IllegalArgumentException("você precisa especificar pelo menos uma fonte de dados");
}
}
// o desenvolvedor configurou a fonte de dados para usar
return currentDataSource.get();
}
/**
*
* @param datasourceName nome da fonte de dados
*/
public void setDataSource(String datasourceName) {
if (dataSources == null) {
init();
}
if (!dataSources.containsKey(datasourceName)) {
throw new IllegalArgumentException("data source called " + datasourceName + " can't be found.");
}
DataSource ds = dataSources.get(datasourceName);
currentDataSource.set(ds);
}
/**
* redefinir a fonte de dados
*/
public void clear() {
currentDataSource.remove();
}
public void setDefaultDataSourceName(String name) {
this.defaultDataSourceName = name;
}
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_declarando_a_implementação">Declarando a implementação</h3>
<div class="paragraph">
<p>Para poder usar seu roteador como um recurso, você precisa fornecer uma
configuração de serviço. Isso é feito em um arquivo que você pode encontrar em
META-INF/org.router/ e chamado service-jar.xml (para sua implementação
é claro que você pode alterar o nome do pacote).</p>
</div>
<div class="paragraph">
<p>Ele contém o seguinte código:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;ServiceJar&gt;
&lt;ServiceProvider id="DeterminedRouter" &lt;!-- o nome que você deseja usar --&gt;
service="Resource"
type="org.apache.openejb.resource.jdbc.Router"
class-name="org.superbiz.dynamicdatasourcerouting.DeterminedRouter"&gt; &lt;!-- classe de implementação --&gt;
# os parametros
DataSourceNames
DefaultDataSourceName
&lt;/ServiceProvider&gt;
&lt;/ServiceJar&gt;</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_usando_o_roteador">Usando o roteador</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Aqui temos um bean sem estado <code>RoutedPersister</code> que usa nosso
<code>DeterminedRouter</code></p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">package org.superbiz.dynamicdatasourcerouting;
import javax.annotation.Resource;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Stateless
public class RoutedPersister {
@PersistenceContext(unitName = "router")
private EntityManager em;
@Resource(name = "My Router", type = DeterminedRouter.class)
private DeterminedRouter router;
public void persist(int id, String name, String ds) {
router.setDataSource(ds);
em.persist(new Person(id, name));
}
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_o_teste">O teste</h2>
<div class="sectionbody">
<div class="paragraph">
<p>No modo de teste e usando a configuração de estilo de propriedade, a seguinte
configuração é usada:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">public class DynamicDataSourceTest {
@Test
public void route() throws Exception {
String[] databases = new String[]{"database1", "database2", "database3"};
Properties properties = new Properties();
properties.setProperty(Context.INITIAL_CONTEXT_FACTORY, LocalInitialContextFactory.class.getName());
// Recursos
// fontes de dados
for (int i = 1; i &lt;= databases.length; i++) {
String dbName = databases[i - 1];
properties.setProperty(dbName, "new://Resource?type=DataSource");
dbName += ".";
properties.setProperty(dbName + "JdbcDriver", "org.hsqldb.jdbcDriver");
properties.setProperty(dbName + "JdbcUrl", "jdbc:hsqldb:mem:db" + i);
properties.setProperty(dbName + "UserName", "sa");
properties.setProperty(dbName + "Password", "");
properties.setProperty(dbName + "JtaManaged", "true");
}
// router
properties.setProperty("My Router", "new://Resource?provider=org.router:DeterminedRouter&amp;type=" + DeterminedRouter.class.getName());
properties.setProperty("My Router.DatasourceNames", "database1 database2 database3");
properties.setProperty("My Router.DefaultDataSourceName", "database1");
// routed datasource
properties.setProperty("Routed Datasource", "new://Resource?provider=RoutedDataSource&amp;type=" + Router.class.getName());
properties.setProperty("Routed Datasource.Router", "My Router");
Context ctx = EJBContainer.createEJBContainer(properties).getContext();
RoutedPersister ejb = (RoutedPersister) ctx.lookup("java:global/dynamic-datasource-routing/RoutedPersister");
for (int i = 0; i &lt; 18; i++) {
// persistir uma pessoa no banco de dados db -&gt; tipo de round robin manual
String name = "record " + i;
String db = databases[i % 3];
ejb.persist(i, name, db);
}
// afirmar o número de registros do banco de dados usando jdbc
for (int i = 1; i &lt;= databases.length; i++) {
Connection connection = DriverManager.getConnection("jdbc:hsqldb:mem:db" + i, "sa", "");
Statement st = connection.createStatement();
ResultSet rs = st.executeQuery("select count(*) from PERSON");
rs.next();
assertEquals(6, rs.getInt(1));
st.close();
connection.close();
}
ctx.close();
}
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_configuração_via_openejb_xml">Configuração via openejb.xml</h2>
<div class="sectionbody">
<div class="paragraph">
<p>O testcase acima usa propriedades para configuração. O caminho idêntico para fazê-lo através do <code>conf/openejb.xml</code> é o seguinte:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;!-- Roteador e fonte de dados --&gt;
&lt;Resource id="My Router" type="org.apache.openejb.router.test.DynamicDataSourceTest$DeterminedRouter" provider="org.routertest:DeterminedRouter"&gt;
DatasourceNames = database1 database2 database3
DefaultDataSourceName = database1
&lt;/Resource&gt;
&lt;Resource id="Routed Datasource" type="org.apache.openejb.resource.jdbc.Router" provider="RoutedDataSource"&gt;
Router = My Router
&lt;/Resource&gt;
&lt;!-- fontes de dados reais --&gt;
&lt;Resource id="database1" type="DataSource"&gt;
JdbcDriver = org.hsqldb.jdbcDriver
JdbcUrl = jdbc:hsqldb:mem:db1
UserName = sa
Password
JtaManaged = true
&lt;/Resource&gt;
&lt;Resource id="database2" type="DataSource"&gt;
JdbcDriver = org.hsqldb.jdbcDriver
JdbcUrl = jdbc:hsqldb:mem:db2
UserName = sa
Password
JtaManaged = true
&lt;/Resource&gt;
&lt;Resource id="database3" type="DataSource"&gt;
JdbcDriver = org.hsqldb.jdbcDriver
JdbcUrl = jdbc:hsqldb:mem:db3
UserName = sa
Password
JtaManaged = true
&lt;/Resource&gt;</code></pre>
</div>
</div>
<div class="sect2">
<h3 id="_algum_hack_para_o_openjpa">Algum hack para o OpenJPA</h3>
<div class="paragraph">
<p>Usar mais de uma fonte de dados atrás de um EntityManager significa que
bancos de dados já foram criados. Se não for esse o caso, o provedor JPA
precisa criar a fonte de dados no momento da inicialização.</p>
</div>
<div class="paragraph">
<p>Hibernate faz isso, se você declarar seus bancos de dados vão funcionar. Contudo
com o OpenJPA (o provedor JPA padrão para o OpenEJB), a criação é
preguiçosa e isso acontece apenas uma vez; quando você alterna o banco de dados, ele não vai funcionar mais.</p>
</div>
<div class="paragraph">
<p>É claro que o OpenEJB fornece os recursos @Singleton e @Startup do Java EE 6
e podemos fazer um bean apenas fazendo uma descoberta simples, mesmo que não exista
entidades, apenas para forçar a criação do banco de dados:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Startup
@Singleton
public class BoostrapUtility {
// injetar todos os bancos de dados reais
@PersistenceContext(unitName = "db1")
private EntityManager em1;
@PersistenceContext(unitName = "db2")
private EntityManager em2;
@PersistenceContext(unitName = "db3")
private EntityManager em3;
// forçar a criação de banco de dados
@PostConstruct
@TransactionAttribute(TransactionAttributeType.SUPPORTS)
public void initDatabase() {
em1.find(Person.class, 0);
em2.find(Person.class, 0);
em3.find(Person.class, 0);
}
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_usando_a_fonte_de_dados_roteada">Usando a fonte de dados roteada</h3>
<div class="paragraph">
<p>Agora você configurou a maneira como deseja rotear sua operação JPA,
registrou os recursos e você inicializou seus bancos de dados, você pode usar
e veja como é simples:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Stateless
public class RoutedPersister {
// injeção da fonte de dados "em proxy"
@PersistenceContext(unitName = "router")
private EntityManager em;
// injeção do roteador, você precisa configurar o banco de dados
@Resource(name = "My Router", type = DeterminedRouter.class)
private DeterminedRouter router;
public void persist(int id, String name, String ds) {
router.setDataSource(ds); // configurando o banco de dados para a transação atual
em.persist(new Person(id, name)); // usará o banco de dados ds automaticamente
}
}</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_executando">Executando</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-console" data-lang="console">-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running org.superbiz.dynamicdatasourcerouting.DynamicDataSourceTest
Apache OpenEJB 4.0.0-beta-1 build: 20111002-04:06
http://tomee.apache.org/
INFO - openejb.home = /Users/dblevins/examples/dynamic-datasource-routing
INFO - openejb.base = /Users/dblevins/examples/dynamic-datasource-routing
INFO - Using 'javax.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=My Router, type=Resource, provider-id=DeterminedRouter)
INFO - Configuring Service(id=database3, type=Resource, provider-id=Default JDBC Database)
INFO - Configuring Service(id=database2, type=Resource, provider-id=Default JDBC Database)
INFO - Configuring Service(id=Routed Datasource, type=Resource, provider-id=RoutedDataSource)
INFO - Configuring Service(id=database1, type=Resource, provider-id=Default JDBC Database)
INFO - Found EjbModule in classpath: /Users/dblevins/examples/dynamic-datasource-routing/target/classes
INFO - Beginning load: /Users/dblevins/examples/dynamic-datasource-routing/target/classes
INFO - Configuring enterprise application: /Users/dblevins/examples/dynamic-datasource-routing
WARN - Method 'lookup' is not available for 'javax.annotation.Resource'. Probably using an older Runtime.
INFO - Configuring Service(id=Default Singleton Container, type=Container, provider-id=Default Singleton Container)
INFO - Auto-creating a container for bean BoostrapUtility: Container(type=SINGLETON, id=Default Singleton Container)
INFO - Configuring Service(id=Default Stateless Container, type=Container, provider-id=Default Stateless Container)
INFO - Auto-creating a container for bean RoutedPersister: Container(type=STATELESS, id=Default Stateless Container)
INFO - Auto-linking resource-ref 'java:comp/env/My Router' in bean RoutedPersister to Resource(id=My Router)
INFO - Configuring Service(id=Default Managed Container, type=Container, provider-id=Default Managed Container)
INFO - Auto-creating a container for bean org.superbiz.dynamicdatasourcerouting.DynamicDataSourceTest: Container(type=MANAGED, id=Default Managed Container)
INFO - Configuring PersistenceUnit(name=router)
INFO - Configuring PersistenceUnit(name=db1)
INFO - Auto-creating a Resource with id 'database1NonJta' of type 'DataSource for 'db1'.
INFO - Configuring Service(id=database1NonJta, type=Resource, provider-id=database1)
INFO - Adjusting PersistenceUnit db1 &lt;non-jta-data-source&gt; to Resource ID 'database1NonJta' from 'null'
INFO - Configuring PersistenceUnit(name=db2)
INFO - Auto-creating a Resource with id 'database2NonJta' of type 'DataSource for 'db2'.
INFO - Configuring Service(id=database2NonJta, type=Resource, provider-id=database2)
INFO - Adjusting PersistenceUnit db2 &lt;non-jta-data-source&gt; to Resource ID 'database2NonJta' from 'null'
INFO - Configuring PersistenceUnit(name=db3)
INFO - Auto-creating a Resource with id 'database3NonJta' of type 'DataSource for 'db3'.
INFO - Configuring Service(id=database3NonJta, type=Resource, provider-id=database3)
INFO - Adjusting PersistenceUnit db3 &lt;non-jta-data-source&gt; to Resource ID 'database3NonJta' from 'null'
INFO - Enterprise application "/Users/dblevins/examples/dynamic-datasource-routing" loaded.
INFO - Assembling app: /Users/dblevins/examples/dynamic-datasource-routing
INFO - PersistenceUnit(name=router, provider=org.apache.openjpa.persistence.PersistenceProviderImpl) - provider time 504ms
INFO - PersistenceUnit(name=db1, provider=org.apache.openjpa.persistence.PersistenceProviderImpl) - provider time 11ms
INFO - PersistenceUnit(name=db2, provider=org.apache.openjpa.persistence.PersistenceProviderImpl) - provider time 7ms
INFO - PersistenceUnit(name=db3, provider=org.apache.openjpa.persistence.PersistenceProviderImpl) - provider time 6ms
INFO - Jndi(name="java:global/dynamic-datasource-routing/BoostrapUtility!org.superbiz.dynamicdatasourcerouting.BoostrapUtility")
INFO - Jndi(name="java:global/dynamic-datasource-routing/BoostrapUtility")
INFO - Jndi(name="java:global/dynamic-datasource-routing/RoutedPersister!org.superbiz.dynamicdatasourcerouting.RoutedPersister")
INFO - Jndi(name="java:global/dynamic-datasource-routing/RoutedPersister")
INFO - Jndi(name="java:global/EjbModule1519652738/org.superbiz.dynamicdatasourcerouting.DynamicDataSourceTest!org.superbiz.dynamicdatasourcerouting.DynamicDataSourceTest")
INFO - Jndi(name="java:global/EjbModule1519652738/org.superbiz.dynamicdatasourcerouting.DynamicDataSourceTest")
INFO - Created Ejb(deployment-id=RoutedPersister, ejb-name=RoutedPersister, container=Default Stateless Container)
INFO - Created Ejb(deployment-id=org.superbiz.dynamicdatasourcerouting.DynamicDataSourceTest, ejb-name=org.superbiz.dynamicdatasourcerouting.DynamicDataSourceTest, container=Default Managed Container)
INFO - Created Ejb(deployment-id=BoostrapUtility, ejb-name=BoostrapUtility, container=Default Singleton Container)
INFO - Started Ejb(deployment-id=RoutedPersister, ejb-name=RoutedPersister, container=Default Stateless Container)
INFO - Started Ejb(deployment-id=org.superbiz.dynamicdatasourcerouting.DynamicDataSourceTest, ejb-name=org.superbiz.dynamicdatasourcerouting.DynamicDataSourceTest, container=Default Managed Container)
INFO - Started Ejb(deployment-id=BoostrapUtility, ejb-name=BoostrapUtility, container=Default Singleton Container)
INFO - Deployed Application(path=/Users/dblevins/examples/dynamic-datasource-routing)
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.504 sec
Results :
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0</code></pre>
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