org.rapidpm.proxybuilder.type.dymamic.virtual.creationstrategy.ServiceStrategyFactoryNoDuplicates Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of rapidpm-dynamic-cdi Show documentation
Show all versions of rapidpm-dynamic-cdi Show documentation
Dynamic Dependency Injection with different ways to manage the resolver-strategy
/*
* 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.rapidpm.proxybuilder.type.dymamic.virtual.creationstrategy;
import org.rapidpm.proxybuilder.type.dymamic.virtual.VirtualDynamicProxyInvocationHandler.ServiceFactory;
import org.rapidpm.proxybuilder.type.dymamic.virtual.VirtualDynamicProxyInvocationHandler.ServiceStrategyFactory;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class ServiceStrategyFactoryNoDuplicates implements ServiceStrategyFactory {
private final Lock initializationLock = new ReentrantLock();
private volatile T realSubject;
@Override
public T realSubject(ServiceFactory factory) {
T result = realSubject;
if (result == null) {
initializationLock.lock();
try {
result = realSubject;
if (result == null) {
result = realSubject = factory.createInstance();
}
} finally {
initializationLock.unlock();
}
}
return result;
}
}