com.sun.jersey.server.impl.container.servlet.ServletAdaptor Maven / Gradle / Ivy
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package com.sun.jersey.server.impl.container.servlet;
import com.sun.jersey.server.impl.ThreadLocalNamedInvoker;
import com.sun.jersey.api.container.ContainerException;
import com.sun.jersey.api.core.ResourceConfig;
import com.sun.jersey.spi.container.WebApplication;
import com.sun.jersey.spi.container.servlet.ServletContainer;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.inject.InjectableProvider;
import com.sun.jersey.core.spi.component.ComponentContext;
import com.sun.jersey.core.spi.component.ComponentScope;
import java.lang.reflect.Proxy;
import java.lang.reflect.Type;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import javax.servlet.ServletConfig;
/**
* A servlet container for deploying root resource classes with support
* for injecting persistence units.
*
* Persistence units that may be injected must be configured in web.xml
* in the normal way plus an additional servlet parameter to enable the
* Jersey servlet to locate them in JNDI. E.g. with the following
* persistence unit configuration:
*
*
* persistence/widget
* WidgetPU
*
*
* the Jersey servlet requires an additional servlet parameter as
* follows:
*
*
* unit:WidgetPU
* persistence/widget
*
*
* Given the above, Jersey will inject the EntityManagerFactory found
* at java:comp/env/persistence/widget in JNDI when encountering a
* field or parameter annotated with @PersistenceUnit(unitName="WidgetPU").
*/
public class ServletAdaptor extends ServletContainer {
private Map persistenceUnits =
new HashMap();
@Override
protected void configure(ServletConfig servletConfig, ResourceConfig rc, WebApplication wa) {
super.configure(servletConfig, rc, wa);
/**
* Look for persistent units.
*/
for (Enumeration e = servletConfig.getInitParameterNames() ; e.hasMoreElements() ;) {
String key = (String)e.nextElement();
String value = servletConfig.getInitParameter(key);
if (key.startsWith("unit:")) {
persistenceUnits.put(key.substring(5),"java:comp/env/"+value);
}
}
rc.getSingletons().add(new InjectableProvider() {
@Override
public ComponentScope getScope() {
return ComponentScope.Singleton;
}
@Override
public Injectable getInjectable(ComponentContext ic, PersistenceUnit pu, Type c) {
if (!c.equals(EntityManagerFactory.class))
return null;
// TODO localize error message
if (!persistenceUnits.containsKey(pu.unitName()))
throw new ContainerException("Persistence unit '"+
pu.unitName()+
"' is not configured as a servlet parameter in web.xml");
String jndiName = persistenceUnits.get(pu.unitName());
ThreadLocalNamedInvoker emfHandler =
new ThreadLocalNamedInvoker(jndiName);
final EntityManagerFactory emf = (EntityManagerFactory) Proxy.newProxyInstance(
this.getClass().getClassLoader(),
new Class[] { EntityManagerFactory.class },
emfHandler);
return new Injectable() {
@Override
public EntityManagerFactory getValue() {
return emf;
}
};
}
});
}
}