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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.openjpa.util;
import java.security.ProtectionDomain;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.apache.openjpa.lib.conf.Configuration;
/**
* Service to load classes dynamically at runtime.
* This class got forked from Apache OpenWebBeans
*/
public class ClassLoaderProxyService
{
private final ProxiesClassLoader loader;
public ClassLoaderProxyService(Configuration config, final ClassLoader parentLoader)
{
if (parentLoader instanceof ProxiesClassLoader) {
this.loader = (ProxiesClassLoader) parentLoader;
}
else {
this.loader = new ProxiesClassLoader(parentLoader, false);
}
}
protected ClassLoaderProxyService(final ProxiesClassLoader loader)
{
this.loader = loader;
}
public ClassLoader getProxyClassLoader(final Class forClass)
{
return loader;
}
public Class defineAndLoad(final String name, final byte[] bytecode, final Class proxiedClass)
{
return (Class) loader.getOrRegister(
name, bytecode, proxiedClass.getPackage(), proxiedClass.getProtectionDomain());
}
public T newInstance(final Class proxyClass)
{
try
{
return proxyClass.getConstructor().newInstance();
}
catch (final Exception e)
{
throw new IllegalStateException("Failed to create a new Proxy instance of " + proxyClass.getName(), e);
}
}
private static class ProxiesClassLoader extends ClassLoader
{
private final boolean skipPackages;
private final ConcurrentMap> classes = new ConcurrentHashMap<>();
private ProxiesClassLoader(final ClassLoader parentLoader, boolean skipPackages)
{
super(parentLoader);
this.skipPackages = skipPackages;
}
@Override
protected Class loadClass(final String name, final boolean resolve) throws ClassNotFoundException
{
final Class clazz = classes.get(name);
if (clazz == null)
{
return getParent().loadClass(name);
}
return clazz;
}
private Class getOrRegister(final String proxyClassName, final byte[] proxyBytes,
final Package pck, final ProtectionDomain protectionDomain)
{
final String key = proxyClassName.replace('/', '.');
Class existing = classes.get(key);
if (existing == null)
{
synchronized (this)
{
existing = classes.get(key);
if (existing == null)
{
if (!skipPackages)
{
definePackageFor(pck, protectionDomain);
}
existing = super.defineClass(proxyClassName, proxyBytes, 0, proxyBytes.length);
resolveClass(existing);
classes.put(key, existing);
}
}
try
{
Class.forName(existing.getName(), true, existing.getClassLoader());
}
catch (ClassNotFoundException e)
{
// no-op, not critical, will be done at first instantiation but shouldn't happen anyway
}
}
return existing;
}
private void definePackageFor(final Package model, final ProtectionDomain protectionDomain)
{
if (model == null)
{
return;
}
if (getPackage(model.getName()) == null)
{
if (model.isSealed() && protectionDomain != null &&
protectionDomain.getCodeSource() != null &&
protectionDomain.getCodeSource().getLocation() != null)
{
definePackage(
model.getName(),
model.getSpecificationTitle(),
model.getSpecificationVersion(),
model.getSpecificationVendor(),
model.getImplementationTitle(),
model.getImplementationVersion(),
model.getImplementationVendor(),
protectionDomain.getCodeSource().getLocation());
}
else
{
definePackage(
model.getName(),
model.getSpecificationTitle(),
model.getSpecificationVersion(),
model.getSpecificationVendor(),
model.getImplementationTitle(),
model.getImplementationVersion(),
model.getImplementationVendor(),
null);
}
}
}
}
}
