1 /*** 2 * 3 * Copyright 2005 LogicBlaze, Inc. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 **/ 18 package org.logicblaze.lingo; 19 20 import java.lang.reflect.Method; 21 import java.rmi.Remote; 22 import java.util.EventListener; 23 import java.util.HashSet; 24 import java.util.Iterator; 25 import java.util.Set; 26 27 /*** 28 * A simple metadata strategy which uses POJO naming conventions. 29 * 30 * By default all method invocations are synchronous to avoid surprising users of Spring Remoting. However 31 * if you set the {@link #setOneWayForVoidMethods(boolean)} value to true then all void methods which do 32 * not throw checked exceptions become asynchronous one way methods. 33 * 34 * <p/> 35 * Also any object which implements the {@link Remote} interface or the {@link EventListener} 36 * are assumed to be remote and so a remote proxy is used to allow remote notifications and asynchronous 37 * messaging. 38 * 39 * @version $Revision: 1.2 $ 40 */ 41 public class SimpleMetadataStrategy implements MetadataStrategy { 42 private boolean oneWayForVoidMethods; 43 private Set remoteTypes; 44 45 public SimpleMetadataStrategy() { 46 } 47 48 public SimpleMetadataStrategy(boolean oneWayForVoidMethods) { 49 this.oneWayForVoidMethods = oneWayForVoidMethods; 50 } 51 52 public MethodMetadata getMethodMetadata(Method method) { 53 boolean oneway = false; 54 if (oneWayForVoidMethods) { 55 oneway = method.getReturnType().equals(void.class) && method.getExceptionTypes().length == 0; 56 } 57 boolean[] remoteParams = null; 58 Class[] parameterTypes = method.getParameterTypes(); 59 int size = parameterTypes.length; 60 if (size > 0) { 61 remoteParams = new boolean[size]; 62 for (int i = 0; i < size; i++) { 63 remoteParams[i] = isRemoteParameter(method, parameterTypes[i], i); 64 } 65 } 66 return new MethodMetadata(oneway, remoteParams); 67 } 68 69 public boolean isOneWayForVoidMethods() { 70 return oneWayForVoidMethods; 71 } 72 73 public void setOneWayForVoidMethods(boolean oneWayForVoidMethods) { 74 this.oneWayForVoidMethods = oneWayForVoidMethods; 75 } 76 77 public Set getRemoteTypes() { 78 if (remoteTypes == null) { 79 remoteTypes = new HashSet(); 80 populateDefaultRemoteTypes(remoteTypes); 81 } 82 return remoteTypes; 83 } 84 85 86 public void setRemoteTypes(Set remoteTypes) { 87 this.remoteTypes = remoteTypes; 88 } 89 90 protected boolean isRemoteParameter(Method method, Class parameterType, int index) { 91 for (Iterator iter = getRemoteTypes().iterator(); iter.hasNext();) { 92 Class type = (Class) iter.next(); 93 if (type.isAssignableFrom(parameterType)) { 94 return true; 95 } 96 } 97 return false; 98 } 99 100 protected void populateDefaultRemoteTypes(Set remoteTypes) { 101 remoteTypes.add(Remote.class); 102 remoteTypes.add(EventListener.class); 103 } 104 }