com.jfinal.proxy.ProxyClassLoader Maven / Gradle / Ivy

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/**
 * Copyright (c) 2011-2021, James Zhan 詹波 ([email protected]).
 *
 * Licensed 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 com.jfinal.proxy;

import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;

/**
 * ProxyClassLoader
 */
public class ProxyClassLoader extends ClassLoader {
	
	protected Map byteCodeMap = new ConcurrentHashMap<>();
	
	static {
		registerAsParallelCapable();
	}
	
	public ProxyClassLoader() {
		super(getParentClassLoader());
	}
	
	protected static ClassLoader getParentClassLoader() {
		ClassLoader ret = Thread.currentThread().getContextClassLoader();
		return ret != null ? ret : ProxyClassLoader.class.getClassLoader();
	}
	
	public Class loadProxyClass(ProxyClass proxyClass) {
		for (Entry e : proxyClass.getByteCode().entrySet()) {
			byteCodeMap.putIfAbsent(e.getKey(), e.getValue());
		}
		
		try {
			return loadClass(proxyClass.getPkg() + "." + proxyClass.getName());
		} catch (ClassNotFoundException e) {
			throw new RuntimeException(e);
		}
	}
	
	@Override
	protected Class findClass(String name) throws ClassNotFoundException {
		byte[] bytes = byteCodeMap.get(name);
		if (bytes != null) {
			Class ret = defineClass(name, bytes, 0, bytes.length);
			byteCodeMap.remove(name);
			return ret;
		}
		
		return super.findClass(name);
	}
}