/*
* 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.apache.openejb.assembler.classic;
import javax.validation.ValidatorFactory;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.concurrent.locks.ReentrantLock;
// TODO: make it generic (LazyDelegate + Factory + refactor LazyValidator)
public class LazyValidatorFactory implements InvocationHandler {
private final ReentrantLock lock = new ReentrantLock();
private final ClassLoader loader;
private final ValidationInfo info;
private volatile ValidatorFactory factory;
public LazyValidatorFactory(final ClassLoader classLoader, final ValidationInfo validationInfo) {
this.loader = classLoader;
this.info = validationInfo;
}
@Override
public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
ensureDelegate();
try {
return method.invoke(factory, args);
} catch (final InvocationTargetException ite) {
throw ite.getCause();
}
}
private void ensureDelegate() {
if (factory == null) {
final ReentrantLock l = lock;
l.lock();
try {
if (factory == null) {
factory = ValidatorBuilder.buildFactory(loader, info);
}
} finally {
l.unlock();
}
}
}
public ValidatorFactory getFactory() {
ensureDelegate();
return factory;
}
}