| /** |
| * 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.cxf.common.spi; |
| |
| import java.lang.ref.WeakReference; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.cxf.Bus; |
| import org.apache.cxf.BusFactory; |
| import org.apache.cxf.common.util.StringUtils; |
| import org.apache.cxf.common.util.WeakIdentityHashMap; |
| |
| /** Class loader used to store and retrieve class generated during runtime to avoid class generation each time. |
| * inherited class use asmHelper to generate bytes and use @see #loadClass(String, Class<?>, byte[]) |
| * or @see #loadClass(String, ClassLoader, byte[]) to store generated class.Class can be generated during buildtime. |
| * equivalent class is @see org.apache.cxf.common.spi.GeneratedClassClassLoader |
| * @author olivier dufour |
| */ |
| public class ClassGeneratorClassLoader { |
| protected static final Map<Class<?>, WeakReference<TypeHelperClassLoader>> CLASS_MAP |
| = new WeakIdentityHashMap<>(); |
| protected static final Map<ClassLoader, WeakReference<TypeHelperClassLoader>> LOADER_MAP |
| = new WeakIdentityHashMap<>(); |
| protected final Bus bus; |
| |
| public ClassGeneratorClassLoader(final Bus bus) { |
| this.bus = bus == null ? BusFactory.getDefaultBus() : bus; |
| } |
| |
| protected Class<?> loadClass(String className, Class<?> cls, byte[] bytes) { |
| GeneratedClassClassLoaderCapture capture = bus.getExtension(GeneratedClassClassLoaderCapture.class); |
| if (capture != null) { |
| capture.capture(className, bytes); |
| } |
| TypeHelperClassLoader loader = getOrCreateLoader(cls); |
| synchronized (loader) { |
| Class<?> clz = loader.lookupDefinedClass(className); |
| if (clz == null) { |
| return loader.defineClass(className, bytes); |
| } |
| return clz; |
| } |
| } |
| protected Class<?> loadClass(String className, ClassLoader l, byte[] bytes) { |
| GeneratedClassClassLoaderCapture capture = bus.getExtension(GeneratedClassClassLoaderCapture.class); |
| if (capture != null) { |
| capture.capture(className, bytes); |
| } |
| TypeHelperClassLoader loader = getOrCreateLoader(l); |
| synchronized (loader) { |
| Class<?> clz = loader.lookupDefinedClass(className); |
| if (clz == null) { |
| return loader.defineClass(className, bytes); |
| } |
| return clz; |
| } |
| } |
| protected Class<?> findClass(String className, Class<?> cls) { |
| return getOrCreateLoader(cls).lookupDefinedClass(className); |
| } |
| |
| protected Class<?> findClass(String className, ClassLoader classLoader) { |
| return getOrCreateLoader(classLoader).lookupDefinedClass(className); |
| } |
| |
| private static synchronized TypeHelperClassLoader getOrCreateLoader(Class<?> cls) { |
| WeakReference<TypeHelperClassLoader> ref = CLASS_MAP.get(cls); |
| TypeHelperClassLoader ret; |
| if (ref == null || ref.get() == null) { |
| ret = new TypeHelperClassLoader(cls.getClassLoader()); |
| CLASS_MAP.put(cls, new WeakReference<>(ret)); |
| } else { |
| ret = ref.get(); |
| } |
| return ret; |
| } |
| |
| private static synchronized TypeHelperClassLoader getOrCreateLoader(ClassLoader l) { |
| WeakReference<TypeHelperClassLoader> ref = LOADER_MAP.get(l); |
| TypeHelperClassLoader ret; |
| if (ref == null || ref.get() == null) { |
| ret = new TypeHelperClassLoader(l); |
| LOADER_MAP.put(l, new WeakReference<>(ret)); |
| } else { |
| ret = ref.get(); |
| } |
| return ret; |
| } |
| |
| public static class TypeHelperClassLoader extends ClassLoader { |
| private final ConcurrentHashMap<String, Class<?>> defined = new ConcurrentHashMap<>(); |
| |
| TypeHelperClassLoader(ClassLoader parent) { |
| super(parent); |
| } |
| |
| public Class<?> lookupDefinedClass(String name) { |
| return defined.get(StringUtils.slashesToPeriod(name)); |
| } |
| |
| @Override |
| protected Class<?> findClass(String name) throws ClassNotFoundException { |
| if (name.endsWith("package-info")) { |
| return getParent().loadClass(name); |
| } |
| return super.findClass(name); |
| } |
| |
| public Class<?> defineClass(String name, byte[] bytes) { |
| Class<?> ret = defined.get(StringUtils.slashesToPeriod(name)); |
| if (ret != null) { |
| return ret; |
| } |
| if (name.endsWith("package-info")) { |
| String s = name.substring(0, name.length() - 13); |
| Package p = super.getPackage(s); |
| if (p == null) { |
| definePackage(StringUtils.slashesToPeriod(s), |
| null, |
| null, |
| null, |
| null, |
| null, |
| null, |
| null); |
| } |
| } |
| |
| ret = defined.computeIfAbsent(StringUtils.slashesToPeriod(name), |
| key -> TypeHelperClassLoader.super.defineClass(key, bytes, 0, bytes.length)); |
| |
| return ret; |
| } |
| } |
| } |