| /* |
| * |
| * 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.qpid.server.signal; |
| |
| import org.apache.log4j.Logger; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| |
| public abstract class SignalHandlerTask |
| { |
| private static final Logger LOGGER = Logger.getLogger(SignalHandlerTask.class); |
| |
| private static final String HANDLE_METHOD = "handle"; |
| private static final String SUN_MISC_SIGNAL_CLASS = "sun.misc.Signal"; |
| private static final String SUN_MISC_SIGNAL_HANDLER_CLASS = "sun.misc.SignalHandler"; |
| |
| public boolean register(final String signalName) |
| { |
| try |
| { |
| //try to load the signal handling classes |
| Class<?> signalClazz = Class.forName(SUN_MISC_SIGNAL_CLASS); |
| Class<?> handlerClazz = Class.forName(SUN_MISC_SIGNAL_HANDLER_CLASS); |
| |
| //create an InvocationHandler that just executes the SignalHandlerTask |
| InvocationHandler invoker = new InvocationHandler() |
| { |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable |
| { |
| handle(); |
| |
| return null; |
| } |
| }; |
| |
| //create a dynamic proxy implementing SignalHandler |
| Object handler = Proxy.newProxyInstance(handlerClazz.getClassLoader(), new Class[]{handlerClazz}, invoker); |
| |
| //create the Signal to handle |
| Constructor<?> signalConstructor = signalClazz.getConstructor(String.class); |
| Object signal = signalConstructor.newInstance(signalName); |
| |
| //invoke the Signal.handle(signal, handler) method |
| Method handleMethod = signalClazz.getMethod(HANDLE_METHOD, signalClazz, handlerClazz); |
| handleMethod.invoke(null, signal, handler); |
| } |
| catch (Exception e) |
| { |
| LOGGER.debug("Unable to register handler for Signal " + signalName + " due to exception: " + e, e); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| public abstract void handle(); |
| |
| public static String getPlatformDescription() |
| { |
| String name = System.getProperty("os.name"); |
| String osVer = System.getProperty("os.version"); |
| String jvmVendor = System.getProperty("java.vm.vendor"); |
| String jvmName = System.getProperty("java.vm.name"); |
| String javaRuntimeVer = System.getProperty("java.runtime.version"); |
| |
| return "OS: " + name + " " + osVer + ", JVM:" + jvmVendor + " " + jvmName + " " + javaRuntimeVer; |
| } |
| } |