Java tutorial
/* * Copyright 2014, ApiFest project * * 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.apifest.oauth20; import java.io.IOException; import java.net.MalformedURLException; import java.net.URLClassLoader; import java.util.ArrayList; import java.util.Enumeration; import java.util.List; import java.util.jar.JarEntry; import java.util.jar.JarFile; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.apifest.oauth20.api.ExceptionEventHandler; import com.apifest.oauth20.api.LifecycleHandler; import com.apifest.oauth20.api.OnException; import com.apifest.oauth20.api.OnResponse; import com.apifest.oauth20.api.OnRequest; /** * Loads lifecycle event handlers on OAuth server startup. * * @author Rossitsa Borissova */ public class LifecycleEventHandlers { private static Logger log = LoggerFactory.getLogger(LifecycleEventHandlers.class); private static List<Class<LifecycleHandler>> requestEventHandlers = new ArrayList<Class<LifecycleHandler>>(); private static List<Class<LifecycleHandler>> responseEventHandlers = new ArrayList<Class<LifecycleHandler>>(); private static List<Class<ExceptionEventHandler>> exceptionHandlers = new ArrayList<Class<ExceptionEventHandler>>(); @SuppressWarnings("unchecked") public static void loadLifecycleHandlers(URLClassLoader classLoader, String customJar) { try { if (classLoader != null) { JarFile jarFile = new JarFile(customJar); Enumeration<JarEntry> entries = jarFile.entries(); while (entries.hasMoreElements()) { JarEntry entry = entries.nextElement(); if (entry.isDirectory() || !entry.getName().endsWith(".class")) { continue; } // remove .class String className = entry.getName().substring(0, entry.getName().length() - 6); className = className.replace('/', '.'); try { // REVISIT: check for better solution if (className.startsWith("org.jboss.netty") || className.startsWith("org.apache.log4j") || className.startsWith("org.apache.commons")) { continue; } Class<?> clazz = classLoader.loadClass(className); if (clazz.isAnnotationPresent(OnRequest.class) && LifecycleHandler.class.isAssignableFrom(clazz)) { requestEventHandlers.add((Class<LifecycleHandler>) clazz); log.debug("preIssueTokenHandler added {}", className); } if (clazz.isAnnotationPresent(OnResponse.class) && LifecycleHandler.class.isAssignableFrom(clazz)) { responseEventHandlers.add((Class<LifecycleHandler>) clazz); log.debug("postIssueTokenHandler added {}", className); } if (clazz.isAnnotationPresent(OnException.class) && ExceptionEventHandler.class.isAssignableFrom(clazz)) { exceptionHandlers.add((Class<ExceptionEventHandler>) clazz); log.debug("exceptionHandlers added {}", className); } } catch (ClassNotFoundException e1) { // continue } } } } catch (MalformedURLException e) { log.error("cannot load lifecycle handlers", e); } catch (IOException e) { log.error("cannot load lifecycle handlers", e); } catch (IllegalArgumentException e) { log.error(e.getMessage()); } } public static List<Class<LifecycleHandler>> getRequestEventHandlers() { return requestEventHandlers; } public static List<Class<LifecycleHandler>> getResponseEventHandlers() { return responseEventHandlers; } public static List<Class<ExceptionEventHandler>> getExceptionHandlers() { return exceptionHandlers; } }