| /* |
| * 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.ode.jacob.oo; |
| |
| import java.lang.reflect.Method; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| import org.apache.ode.jacob.ChannelRef; |
| import org.apache.ode.jacob.Expression; |
| import org.apache.ode.jacob.Message; |
| import org.apache.ode.jacob.soup.CommChannel; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| public final class ClassUtil { |
| public static final Method RUN_METHOD; |
| public static final String RUN_METHOD_NAME = "run"; |
| public static final String RUN_METHOD_ACTION = "java.lang.Runnable#run"; |
| public static final String SYNCH_RET_METHOD_ACTION = "org.apache.ode.jacob.oo.Synch#ret"; |
| private static final Set<Method> RUN_METHOD_SET = new HashSet<Method>(); |
| private static final Logger LOG = LoggerFactory.getLogger(ClassUtil.class); |
| |
| static { |
| try { |
| // Resolve the {@link Runnable#run} method once statically |
| RUN_METHOD = Runnable.class.getMethod(RUN_METHOD_NAME, new Class[]{}); |
| RUN_METHOD_SET.add(RUN_METHOD); |
| } catch (Exception e) { |
| throw new Error("Cannot resolve 'run()' method", e); |
| } |
| } |
| |
| private ClassUtil() { |
| // Utility class |
| } |
| |
| public static Set<Method> runMethodSet() { |
| return RUN_METHOD_SET; |
| } |
| |
| public static Message createMessage(Runnable target, String action, Object[] args, Channel replyTo) { |
| Message message = new Message(); |
| message.setTo(new ChannelRef(target)); |
| message.setReplyTo(replyTo == null ? null : new ChannelRef(replyTo)); |
| message.setAction(action); |
| message.setBody(args); |
| return message; |
| } |
| |
| public static Message createMessage(CommChannel target, String action, Object[] args, CommChannel replyTo) { |
| Message message = new Message(); |
| message.setTo(new ChannelRef(target)); |
| message.setReplyTo(replyTo == null ? null : new ChannelRef(replyTo)); |
| message.setAction(action); |
| message.setBody(args); |
| return message; |
| } |
| |
| public static String getActionForMethod(Method channelMethod) { |
| if (channelMethod == null) { |
| return null; |
| } |
| MessageHandler handler = channelMethod.getAnnotation(MessageHandler.class); |
| if (handler != null) { |
| return handler.value(); |
| } |
| Class<?> clazz = channelMethod.getDeclaringClass(); |
| if (Runnable.class.isAssignableFrom(clazz) |
| && channelMethod.getName() == "run" |
| && channelMethod.getParameterTypes().length == 0) { |
| return RUN_METHOD_ACTION; |
| } |
| if (!Channel.class.isAssignableFrom(clazz)) { |
| LOG.trace("Action '{}' can only be defined for a Channel extension", channelMethod.getName()); |
| return null; |
| } |
| LOG.trace("Probing Channel class '{}' for declaration of method '{}'", clazz.getName(), channelMethod.getName()); |
| for (Class<?> c : clazz.getInterfaces()) { |
| String action = getChannelMethodAction(c, channelMethod); |
| if (action != null) { |
| return action; |
| } |
| } |
| // ... if clazz is a Channel interface itself |
| return getChannelMethodAction(clazz, channelMethod); |
| } |
| |
| /** |
| * @param clazz |
| * @param method |
| * @return |
| * |
| * The default action associated with a Channel method is defined as Class#method |
| * following a convention similar to javadoc. |
| */ |
| private static String getChannelMethodAction(Class<?> clazz, Method method) { |
| if (Channel.class.isAssignableFrom(clazz)) { |
| try { |
| Method m = clazz.getMethod(method.getName(), method.getParameterTypes()); |
| return m.getDeclaringClass().getName() + "#" + m.getName(); |
| } catch (SecurityException e) { // ignore |
| } catch (NoSuchMethodException e) { // ignore |
| } |
| } |
| return null; |
| } |
| |
| public static Expression findActionMethod(final Set<Method> implementedMethods) { |
| return new Expression() { |
| @SuppressWarnings("unchecked") |
| public <T> T evaluate(Message message, Class<T> type) { |
| String action = message.getAction(); |
| if (Method.class.equals(type) && action != null) { |
| for (Method m : implementedMethods) { |
| if (action.equals(ClassUtil.getActionForMethod(m))) { |
| return (T)m; |
| } |
| } |
| } |
| return null; |
| } |
| }; |
| } |
| |
| |
| public static Set<Method> getImplementedMethods(Set<Method> methods, Class<?> clazz) { |
| // TODO: this can be optimized (some 20 times faster in my tests) by keeping a private |
| // map of interfaces to methods: Map<Class<?>, Method[]> and just do lookups |
| Class<?>[] interfaces = clazz.getInterfaces(); |
| for (Class<?> iface : interfaces) { |
| // TODO: the test below could be more generic... |
| if (iface != ChannelProxy.class) { |
| for (Method method : iface.getDeclaredMethods()) { |
| methods.add(method); |
| } |
| getImplementedMethods(methods, iface); |
| } |
| } |
| return methods; |
| } |
| } |