org.glassfish.jersey.servlet.internal.PersistenceUnitBinder Maven / Gradle / Ivy
/*
* Copyright (c) 2013, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.jersey.servlet.internal;
import java.lang.reflect.Proxy;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import jakarta.ws.rs.core.GenericType;
import jakarta.inject.Singleton;
import jakarta.persistence.EntityManagerFactory;
import jakarta.persistence.PersistenceUnit;
import jakarta.servlet.ServletConfig;
import org.glassfish.jersey.internal.inject.AbstractBinder;
import org.glassfish.jersey.internal.inject.Injectee;
import org.glassfish.jersey.internal.inject.InjectionResolver;
import org.glassfish.jersey.server.ContainerException;
/**
* {@link PersistenceUnit Persistence unit} injection binder.
*
* @author Michal Gajdos
*/
public class PersistenceUnitBinder extends AbstractBinder {
private final ServletConfig servletConfig;
/**
* Prefix of the persistence unit init param.
*/
public static final String PERSISTENCE_UNIT_PREFIX = "unit:";
/**
* Creates a new binder for {@link PersistenceUnitInjectionResolver}.
*
* @param servletConfig servlet config to find persistence units.
*/
public PersistenceUnitBinder(ServletConfig servletConfig) {
this.servletConfig = servletConfig;
}
@Singleton
private static class PersistenceUnitInjectionResolver implements InjectionResolver {
private final Map persistenceUnits = new HashMap<>();
private PersistenceUnitInjectionResolver(ServletConfig servletConfig) {
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(Injectee injectee) {
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(persistenceUnits.get(unitName)));
}
@Override
public boolean isConstructorParameterIndicator() {
return false;
}
@Override
public boolean isMethodParameterIndicator() {
return false;
}
@Override
public Class getAnnotation() {
return PersistenceUnit.class;
}
}
@Override
protected void configure() {
bind(new PersistenceUnitInjectionResolver(servletConfig))
.to(new GenericType>() {});
}
}