    001// Copyright 2011 The Apache Software Foundation
    002//
    003// Licensed under the Apache License, Version 2.0 (the "License");
    004// you may not use this file except in compliance with the License.
    005// You may obtain a copy of the License at
    006//
    007// http://www.apache.org/licenses/LICENSE-2.0
    008//
    009// Unless required by applicable law or agreed to in writing, software
    010// distributed under the License is distributed on an "AS IS" BASIS,
    011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012// See the License for the specific language governing permissions and
    013// limitations under the License.
    014
    015package org.apache.tapestry5.internal.plastic;
    016
    017public class PlasticClassLoader extends ClassLoader
    018{
    019    static
    020    {
    021        // TAP5-2546
    022        ClassLoader.registerAsParallelCapable();
    023    }
    024
    025    private final ClassLoaderDelegate delegate;
    026
    027    public PlasticClassLoader(ClassLoader parent, ClassLoaderDelegate delegate)
    028    {
    029        super(parent);
    030
    031        this.delegate = delegate;
    032    }
    033
    034    @Override
    035    protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException
    036    {
    037        synchronized(getClassLoadingLock(name))
    038        {
    039            Class<?> loadedClass = findLoadedClass(name);
    040
    041            if (loadedClass != null)
    042                return loadedClass;
    043
    044            if (delegate.shouldInterceptClassLoading(name))
    045            {
    046                Class<?> c = delegate.loadAndTransformClass(name);
    047
    048                if (resolve)
    049                    resolveClass(c);
    050
    051                return c;
    052            } else
    053            {
    054                return super.loadClass(name, resolve);
    055            }
    056        }
    057    }
    058
    059    public synchronized Class<?> defineClassWithBytecode(String className, byte[] bytecode)
    060    {
    061        synchronized(getClassLoadingLock(className))
    062        {
    063            return defineClass(className, bytecode, 0, bytecode.length);
    064        }
    065    }
    066}