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}