/*
* 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 java.util.HashMap;
import java.util.Map;
/**
* Thread-Local Class Cache is useful when the regular class-cache is disabled - we want to keep classes cached
* at very least for the duration of a single deserialization request. Otherwise things may get funky with e.g.
* class hierarchies.
*/
public final class ThreadLocalClassCache {
public static final ThreadLocal<ThreadLocalClassCache> THREAD_LOCAL_CLASS_CACHE = new ThreadLocal<ThreadLocalClassCache>();
private int counter = 1;
private Map<String, ClassSource> map = new HashMap<String, ClassSource>();
private ThreadLocalClassCache() {
}
private int decCounter() {
counter--;
return counter;
}
private void incCounter() {
counter++;
}
public static void onStartDeserialization() {
ThreadLocalClassCache threadLocalClassCache = THREAD_LOCAL_CLASS_CACHE.get();
if (threadLocalClassCache != null) {
threadLocalClassCache.incCounter();
}
}
public static void onFinishDeserialization() {
ThreadLocalClassCache threadLocalClassCache = THREAD_LOCAL_CLASS_CACHE.get();
if (threadLocalClassCache != null && threadLocalClassCache.decCounter() == 0) {
THREAD_LOCAL_CLASS_CACHE.remove();
}
}
public static void store(String name, ClassSource classSource) {
ThreadLocalClassCache threadLocalClassCache = THREAD_LOCAL_CLASS_CACHE.get();
if (threadLocalClassCache == null) {
threadLocalClassCache = new ThreadLocalClassCache();
THREAD_LOCAL_CLASS_CACHE.set(threadLocalClassCache);
}
threadLocalClassCache.map.put(name, classSource);
}
public static ClassSource getFromCache(String name) {
ThreadLocalClassCache threadLocalClassCache = THREAD_LOCAL_CLASS_CACHE.get();
if (threadLocalClassCache != null) {
return threadLocalClassCache.map.get(name);
}
return null;
}
}