io.netty.handler.codec.serialization.ClassResolvers Maven / Gradle / Ivy
/*
* 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
}
}