/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.internal.usercodedeployment.impl;
import com.hazelcast.internal.util.JavaVersion;
import com.hazelcast.util.ContextMutexFactory;
import java.io.Closeable;
import static com.hazelcast.internal.util.JavaVersion.JAVA_1_7;
/**
* Java 7+ onwards allows parallel classloading. Therefore we can define use a lock with per-class granularity.
* However in Java 6 we have to use a fat global lock.
*
* This abstraction provides a suitable mutex depending on the version of underlying platform.
*
* The provided mutexes are closeable as we want to know when the granular mutexes from Java are no longer needed.
*/
public class ClassloadingMutexProvider {
private static final boolean USE_PARALLEL_LOADING = isParallelClassLoadingPossible();
private final ContextMutexFactory mutexFactory = new ContextMutexFactory();
private final GlobalMutex globalMutex = new GlobalMutex();
public Closeable getMutexForClass(String classname) {
if (USE_PARALLEL_LOADING) {
return mutexFactory.mutexFor(classname);
} else {
return globalMutex;
}
}
private static boolean isParallelClassLoadingPossible() {
return JavaVersion.isAtLeast(JAVA_1_7);
}
}