scouter.agent.proxy.LoaderManager Maven / Gradle / Ivy
/*
* Copyright 2015 the original author or authors.
* @https://github.com/scouter-project/scouter
*
* 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 scouter.agent.proxy;
import java.io.File;
import java.io.InputStream;
import java.net.URL;
import java.net.URLClassLoader;
import scouter.agent.JavaAgent;
import scouter.agent.Logger;
import scouter.agent.util.ManifestUtil;
import scouter.util.ArrayUtil;
import scouter.util.BytesClassLoader;
import scouter.util.FileUtil;
import scouter.util.HashUtil;
import scouter.util.IntKeyLinkedMap;
/**
* @author Paul S.J. Kim([email protected])
*/
public class LoaderManager {
private static ClassLoader toolsLoader;
private static IntKeyLinkedMap loaders = new IntKeyLinkedMap().setMax(10);
public synchronized static ClassLoader getToolsLoader() {
if (toolsLoader == null) {
try {
File tools = ManifestUtil.getToolsFile();
toolsLoader = new URLClassLoader(new URL[] { tools.toURI().toURL() });
} catch (Throwable e) {
Logger.println("A134", e);
}
}
return createLoader(toolsLoader, "scouter.tools");
}
public static ClassLoader getHttpLoader(ClassLoader parent) {
return createLoader(parent, "scouter.http");
}
public static ClassLoader getDB2Loader(ClassLoader parent) {
return createLoader(parent, "scouter.jdbc");
}
public static ClassLoader getHttpClient(ClassLoader parent) {
return createLoader(parent, "scouter.httpclient");
}
private synchronized static ClassLoader createLoader(ClassLoader parent, String key) {
int hashKey = (parent == null ? 0 : System.identityHashCode(parent));
hashKey = hashKey ^ HashUtil.hash(key);
ClassLoader loader = loaders.get(hashKey);
if (loader == null) {
try {
byte[] bytes = deployJarBytes(key);
if (bytes != null) {
loader = new BytesClassLoader(bytes, parent);
loaders.put(hashKey, loader);
}
} catch (Throwable e) {
Logger.println("A137", "SUBLOADER " + key + " " + e);
}
}
return loader;
}
private static byte[] deployJarBytes(String jarname) {
try {
InputStream is = JavaAgent.class.getResourceAsStream("/" + jarname + ".jar");
byte[] newBytes = FileUtil.readAll(is);
is.close();
Logger.println("NONE", "LoadJarBytes " + jarname + " " + ArrayUtil.len(newBytes) + " bytes");
return newBytes;
} catch (Exception e) {
Logger.println("NONE", "fail to load jar bytes " + jarname);
return null;
}
}
}