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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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.jboss.netty.handler.codec.serialization;

import java.lang.ref.Reference;
import java.util.HashMap;
import java.util.concurrent.ConcurrentHashMap;

public final class ClassResolvers {

    /**
     * cache disabled
     * @param classLoader - specific classLoader to use, or null if you want to revert to default
     * @return new instance of class resolver
     */
    public static ClassResolver cacheDisabled(ClassLoader classLoader) {
        return new ClassLoaderClassResolver(defaultClassLoader(classLoader));
    }

    /**
     * non-agressive non-concurrent cache
     * good for non-shared default cache
     *
     * @param classLoader - specific classLoader to use, or null if you want to revert to default
     * @return new instance of class resolver
     */
    public static ClassResolver weakCachingResolver(ClassLoader classLoader) {
        return new CachingClassResolver(
                new ClassLoaderClassResolver(defaultClassLoader(classLoader)),
                new WeakReferenceMap>(new HashMap>>()));
    }

    /**
     * agressive non-concurrent cache
     * good for non-shared cache, when we're not worried about class unloading
     *
     * @param classLoader - specific classLoader to use, or null if you want to revert to default
     * @return new instance of class resolver
     */
    public static ClassResolver softCachingResolver(ClassLoader classLoader) {
        return new CachingClassResolver(
                new ClassLoaderClassResolver(defaultClassLoader(classLoader)),
                new SoftReferenceMap>(new HashMap>>()));
    }

    /**
     * non-agressive concurrent cache
     * good for shared cache, when we're worried about class unloading
     *
     * @param classLoader - specific classLoader to use, or null if you want to revert to default
     * @return new instance of class resolver
     */
    public static ClassResolver weakCachingConcurrentResolver(ClassLoader classLoader) {
        return new CachingClassResolver(
                new ClassLoaderClassResolver(defaultClassLoader(classLoader)),
                new WeakReferenceMap>(new ConcurrentHashMap>>()));
    }

    /**
     * agressive concurrent cache
     * good for shared cache, when we're not worried about class unloading
     *
     * @param classLoader - specific classLoader to use, or null if you want to revert to default
     * @return new instance of class resolver
     */
    public static ClassResolver softCachingConcurrentResolver(ClassLoader classLoader) {
        return new CachingClassResolver(
                new ClassLoaderClassResolver(defaultClassLoader(classLoader)),
                new SoftReferenceMap>(new ConcurrentHashMap>>()));
    }

    static ClassLoader defaultClassLoader(ClassLoader classLoader) {
        if (classLoader != null) {
            return classLoader;
        }

        final ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
        if (contextClassLoader != null) {
            return contextClassLoader;
        }

        return ClassResolvers.class.getClassLoader();
    }

    private ClassResolvers() {
        // Unused
    }
}