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<div class='page-header'>
<h1>Dynamic Datasource Routing</h1>
</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>The TomEE dynamic datasource api aims to allow to use multiple data
sources as one from an application point of view.</p>
</div>
<div class="paragraph">
<p>It can be useful for technical reasons (load balancing for example) or
more generally functionnal reasons (filtering, aggregation, enriching…).
However please note you can choose only one datasource by transaction.
It means the goal of this feature is not to switch more than once of
datasource in a transaction. The following code will not work:</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"); // same transaction -&gt; this invocation doesn't work
em.persist(new MyEntity());
}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>In this example the implementation simply use a datasource from its name
and needs to be set before using any JPA operation in the transaction
(to keep the logic simple in the example).</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_the_implementation_of_the_router">The implementation of the Router</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Our router has two configuration parameters: * a list of jndi names
representing datasources to use * a default datasource to use</p>
</div>
<div class="sect2">
<h3 id="_router_implementation">Router implementation</h3>
<div class="paragraph">
<p>The interface Router (<code>org.apache.openejb.resource.jdbc.Router</code>) has
only one method to implement, <code>public DataSource getDataSource()</code></p>
</div>
<div class="paragraph">
<p>Our <code>DeterminedRouter</code> implementation uses a ThreadLocal to manage the
currently used datasource. Keep in mind JPA used more than once the
getDatasource() method for one operation. To change the datasource in
one transaction is dangerous and should be avoid.</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 datasource resource name, separator is a space
*/
public void setDataSourceNames(String datasourceList) {
dataSourceNames = datasourceList;
}
/**
* lookup datasource in openejb resources
*/
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) {
// ignored
}
}
}
/**
* @return the user selected data source if it is set
* or the default one
* @throws IllegalArgumentException if the data source is not found
*/
@Override
public DataSource getDataSource() {
// lazy init of routed datasources
if (dataSources == null) {
init();
}
// if no datasource is selected use the default one
if (currentDataSource.get() == null) {
if (dataSources.containsKey(defaultDataSourceName)) {
return dataSources.get(defaultDataSourceName);
} else {
throw new IllegalArgumentException("you have to specify at least one datasource");
}
}
// the developper set the datasource to use
return currentDataSource.get();
}
/**
*
* @param datasourceName data source name
*/
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);
}
/**
* reset the data source
*/
public void clear() {
currentDataSource.remove();
}
public void setDefaultDataSourceName(String name) {
this.defaultDataSourceName = name;
}
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="_declaring_the_implementation">Declaring the implementation</h3>
<div class="paragraph">
<p>To be able to use your router as a resource you need to provide a
service configuration. It is done in a file you can find in
META-INF/org.router/ and called service-jar.xml (for your implementation
you can of course change the package name).</p>
</div>
<div class="paragraph">
<p>It contains the following code:</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;!-- the name you want to use --&gt;
service="Resource"
type="org.apache.openejb.resource.jdbc.Router"
class-name="org.superbiz.dynamicdatasourcerouting.DeterminedRouter"&gt; &lt;!-- implementation class --&gt;
# the parameters
DataSourceNames
DefaultDataSourceName
&lt;/ServiceProvider&gt;
&lt;/ServiceJar&gt;</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_using_the_router">Using the Router</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Here we have a <code>RoutedPersister</code> stateless bean which uses our
<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 jakarta.annotation.Resource;
import jakarta.ejb.Stateless;
import jakarta.persistence.EntityManager;
import jakarta.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="_the_test">The test</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In test mode and using property style configuration the foolowing
configuration is used:</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());
// resources
// datasources
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++) {
// persisting a person on database db -&gt; kind of manual round robin
String name = "record " + i;
String db = databases[i % 3];
ejb.persist(i, name, db);
}
// assert database records number using 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="_configuration_via_openejb_xml">Configuration via openejb.xml</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The testcase above uses properties for configuration. The identical way
to do it via the <code>conf/openejb.xml</code> is as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-xml" data-lang="xml">&lt;!-- Router and datasource --&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;!-- real datasources --&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="_some_hack_for_openjpa">Some hack for OpenJPA</h3>
<div class="paragraph">
<p>Using more than one datasource behind one EntityManager means the
databases are already created. If it is not the case, the JPA provider
has to create the datasource at boot time.</p>
</div>
<div class="paragraph">
<p>Hibernate do it so if you declare your databases it will work. However
with OpenJPA (the default JPA provider for OpenEJB), the creation is
lazy and it happens only once so when you’ll switch of database it will
no more work.</p>
</div>
<div class="paragraph">
<p>Of course OpenEJB provides @Singleton and @Startup features of Java EE 6
and we can do a bean just making a simple find, even on none existing
entities, just to force the database creation:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Startup
@Singleton
public class BoostrapUtility {
// inject all real databases
@PersistenceContext(unitName = "db1")
private EntityManager em1;
@PersistenceContext(unitName = "db2")
private EntityManager em2;
@PersistenceContext(unitName = "db3")
private EntityManager em3;
// force database creation
@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="_using_the_routed_datasource">Using the routed datasource</h3>
<div class="paragraph">
<p>Now you configured the way you want to route your JPA operation, you
registered the resources and you initialized your databases you can use
it and see how it is simple:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@Stateless
public class RoutedPersister {
// injection of the "proxied" datasource
@PersistenceContext(unitName = "router")
private EntityManager em;
// injection of the router you need it to configured the database
@Resource(name = "My Router", type = DeterminedRouter.class)
private DeterminedRouter router;
public void persist(int id, String name, String ds) {
router.setDataSource(ds); // configuring the database for the current transaction
em.persist(new Person(id, name)); // will use ds database automatically
}
}</code></pre>
</div>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_running">Running</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 '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=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 'jakarta.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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