001 /*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019
020 package org.crsh.util;
021
022 import java.lang.reflect.Constructor;
023 import java.lang.reflect.InvocationHandler;
024 import java.lang.reflect.Method;
025 import java.lang.reflect.Proxy;
026 import java.util.logging.Level;
027 import java.util.logging.Logger;
028
029 public class InterruptHandler {
030
031 /** . */
032 private final Runnable runnable;
033
034 /** . */
035 private final Logger log = Logger.getLogger(InterruptHandler.class.getName());
036
037 private final InvocationHandler handler = new InvocationHandler() {
038 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
039 Class<?>[] parameterTypes = method.getParameterTypes();
040 if (method.getName().equals("hashCode") && parameterTypes.length == 0) {
041 return System.identityHashCode(runnable);
042 } else if (method.getName().equals("equals") && parameterTypes.length == 1 && parameterTypes[0] == Object.class) {
043 return runnable.equals(args[0]);
044 } else if (method.getName().equals("toString") && parameterTypes.length == 0) {
045 return runnable.toString();
046 } else if (method.getName().equals("handle")) {
047 runnable.run();
048 return null;
049 } else {
050 throw new UnsupportedOperationException("Method " + method + " not implemented");
051 }
052 }
053 };
054
055 public InterruptHandler(Runnable runnable) {
056 this.runnable = runnable;
057 }
058
059 public void install() {
060 ClassLoader cl = Thread.currentThread().getContextClassLoader();
061 Class<?> signalHandlerClass;
062 Class<?> signalClass;
063 Method handle;
064 Object INT;
065 try {
066 signalHandlerClass = cl.loadClass("sun.misc.SignalHandler");
067 signalClass = cl.loadClass("sun.misc.Signal");
068 handle = signalClass.getDeclaredMethod("handle", signalClass, signalHandlerClass);
069 Constructor ctor = signalClass.getConstructor(String.class);
070 INT = ctor.newInstance("INT");
071 }
072 catch (Exception e) {
073 return;
074 }
075
076 //
077 Object proxy = Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class<?>[]{signalHandlerClass}, handler);
078
079 //
080 try {
081 handle.invoke(null, INT, proxy);
082 }
083 catch (Exception e) {
084 log.log(Level.SEVERE, "Could not install signal handler", e);
085 }
086 }
087 }