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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:
 *
 *   https://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 io.netty.handler.codec.serialization;

import io.netty.util.internal.PlatformDependent;

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

/**
 * Factory methods for creating {@link ClassResolver} instances.
 * 

* Security: serialization can be a security liability, * and should not be used without defining a list of classes that are * allowed to be desirialized. Such a list can be specified with the * jdk.serialFilter system property, for instance. * See the * serialization filtering article for more information. * * @deprecated This class has been deprecated with no replacement, * because serialization can be a security liability */ @Deprecated 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-aggressive 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>>())); } /** * aggressive 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-aggressive 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>( PlatformDependent.>>newConcurrentHashMap())); } /** * aggressive 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>( PlatformDependent.>>newConcurrentHashMap())); } static ClassLoader defaultClassLoader(ClassLoader classLoader) { if (classLoader != null) { return classLoader; } final ClassLoader contextClassLoader = PlatformDependent.getContextClassLoader(); if (contextClassLoader != null) { return contextClassLoader; } return PlatformDependent.getClassLoader(ClassResolvers.class); } private ClassResolvers() { // Unused } }





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