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package org.glassfish.jersey.servlet.internal;
import java.lang.reflect.Proxy;
import java.util.Enumeration;
import java.util.Map;
import javax.inject.Inject;
import javax.inject.Singleton;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import javax.servlet.ServletConfig;
import org.glassfish.jersey.server.ContainerException;
import org.glassfish.hk2.api.Injectee;
import org.glassfish.hk2.api.InjectionResolver;
import org.glassfish.hk2.api.ServiceHandle;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.api.TypeLiteral;
import org.glassfish.hk2.utilities.binding.AbstractBinder;
import jersey.repackaged.com.google.common.collect.Maps;
/**
* {@link PersistenceUnit Persistence unit} injection binder.
*
* @author Michal Gajdos (michal.gajdos at oracle.com)
*/
public class PersistenceUnitBinder extends AbstractBinder {
/**
* Prefix of the persistence unit init param.
*/
public final static String PERSISTENCE_UNIT_PREFIX = "unit:";
@Singleton
private static class PersistenceUnitInjectionResolver implements InjectionResolver<PersistenceUnit> {
private final Map<String, String> persistenceUnits = Maps.newHashMap();
@Inject
private PersistenceUnitInjectionResolver(final ServiceLocator locator) {
// Look for persistence units.
final ServletConfig servletConfig = locator.getService(ServletConfig.class);
for (final Enumeration parameterNames = servletConfig.getInitParameterNames(); parameterNames.hasMoreElements(); ) {
final String key = (String) parameterNames.nextElement();
if (key.startsWith(PERSISTENCE_UNIT_PREFIX)) {
persistenceUnits.put(key.substring(PERSISTENCE_UNIT_PREFIX.length()),
"java:comp/env/" + servletConfig.getInitParameter(key));
}
}
}
@Override
public Object resolve(final Injectee injectee, final ServiceHandle<?> root) {
if (!injectee.getRequiredType().equals(EntityManagerFactory.class)) {
return null;
}
final PersistenceUnit annotation = injectee.getParent().getAnnotation(PersistenceUnit.class);
final String unitName = annotation.unitName();
if (!persistenceUnits.containsKey(unitName)) {
throw new ContainerException(LocalizationMessages.PERSISTENCE_UNIT_NOT_CONFIGURED(unitName));
}
return Proxy.newProxyInstance(
this.getClass().getClassLoader(),
new Class[]{EntityManagerFactory.class},
new ThreadLocalNamedInvoker<EntityManagerFactory>(persistenceUnits.get(unitName)));
}
@Override
public boolean isConstructorParameterIndicator() {
return false;
}
@Override
public boolean isMethodParameterIndicator() {
return false;
}
}
@Override
protected void configure() {
bind(PersistenceUnitInjectionResolver.class)
.to(new TypeLiteral<InjectionResolver<PersistenceUnit>>() {})
.in(Singleton.class);
}
}