/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.superbiz.dynamic.framework;
import org.springframework.data.jpa.repository.support.JpaRepositoryFactory;
import org.springframework.data.repository.Repository;
import javax.annotation.Resource;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.concurrent.atomic.AtomicReference;
public class SpringDataProxy implements InvocationHandler {
@PersistenceContext(unitName = "dynamic")
private EntityManager em;
@Resource(name = "implementingInterfaceClass")
private Class<Repository<?, ?>> implementingInterfaceClass; // implicitly for this kind of proxy
private final AtomicReference<Repository<?, ?>> repository = new AtomicReference<Repository<?, ?>>();
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (repository.get() == null) {
synchronized (this) {
if (repository.get() == null) {
repository.set(new JpaRepositoryFactory(em).getRepository(implementingInterfaceClass));
}
}
}
return method.invoke(repository.get(), args);
}
}