001 /* 002 * Copyright © 2008, 2009 Pedro Agulló Soliveres. 003 * 004 * This file is part of DirectJNgine. 005 * 006 * DirectJNgine is free software: you can redistribute it and/or modify 007 * it under the terms of the GNU General Public License as published by 008 * the Free Software Foundation, either version 3 of the License. 009 * 010 * Commercial use is permitted to the extent that the code/component(s) 011 * do NOT become part of another Open Source or Commercially developed 012 * licensed development library or toolkit without explicit permission. 013 * 014 * DirectJNgine is distributed in the hope that it will be useful, 015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 017 * GNU General Public License for more details. 018 * 019 * You should have received a copy of the GNU General Public License 020 * along with DirectJNgine. If not, see <http://www.gnu.org/licenses/>. 021 * 022 * This software uses the ExtJs library (http://extjs.com), which is 023 * distributed under the GPL v3 license (see http://extjs.com/license). 024 */ 025 026 package com.softwarementors.extjs.djn.router.dispatcher; 027 028 import java.lang.reflect.Constructor; 029 import java.lang.reflect.InvocationTargetException; 030 import java.lang.reflect.Method; 031 import java.lang.reflect.Modifier; 032 033 import com.softwarementors.extjs.djn.ClassUtils; 034 import com.softwarementors.extjs.djn.Timer; 035 import com.softwarementors.extjs.djn.router.processor.RequestException; 036 037 public class Dispatcher { 038 039 public Dispatcher() { 040 super(); 041 } 042 043 public Object dispatch( Class<?> instanceClass, Method method, Object[] parameters ) { 044 int expectedArgumentCount = method.getParameterTypes().length; 045 if( parameters.length != expectedArgumentCount ) { 046 throw RequestException.forWrongMethodArgumentCount( method, expectedArgumentCount, parameters.length ); 047 } 048 049 Timer timer = new Timer(); 050 try { 051 Object actionInstance = null; 052 if( !Modifier.isStatic(method.getModifiers())) { 053 actionInstance = createActionInstance(instanceClass); 054 } 055 Object result = invokeMethod( method, actionInstance, parameters); 056 return result; 057 } 058 finally { 059 timer.stop(); 060 timer.logDebugTimeInMilliseconds(" - Java method dispatch time (" + ClassUtils.getSimpleName(method.getDeclaringClass()) + "." + method.getName() + ")" ); 061 } 062 } 063 064 protected Object createActionInstance(Class<?> instanceClass) { 065 Object actionInstance; 066 try { 067 Constructor<?> c = instanceClass.getConstructor(); 068 // Invoke private constructors too 069 boolean accessible = c.isAccessible(); 070 try { 071 c.setAccessible(true); 072 actionInstance = c.newInstance(); 073 } 074 finally { 075 c.setAccessible(accessible); 076 } 077 return actionInstance; 078 } 079 catch (InstantiationException e) { 080 throw createUnableToCreateInstanceException(instanceClass, e); 081 } 082 catch (IllegalAccessException e) { 083 throw createUnableToCreateInstanceException(instanceClass, e); 084 } 085 catch (SecurityException e) { 086 throw createUnableToCreateInstanceException(instanceClass, e); 087 } 088 catch (NoSuchMethodException e) { 089 throw createUnableToCreateInstanceException(instanceClass, e); 090 } 091 catch (IllegalArgumentException e) { 092 throw createUnableToCreateInstanceException(instanceClass, e); 093 } 094 catch (InvocationTargetException e) { 095 throw createUnableToCreateInstanceException(instanceClass, e); 096 } 097 } 098 099 protected MethodExecutionException createUnableToCreateInstanceException(Class<?> instanceClass, Throwable e) { 100 return MethodExecutionException.forUnableToCreateClassInstance( instanceClass, e ); 101 } 102 103 private Object invokeMethod(Method method, Object actionInstance, Object[] parameters) { 104 assert method != null; 105 assert parameters != null; 106 107 Object result; 108 try { 109 // Invoke private methods too! 110 boolean accessible = method.isAccessible(); 111 try { 112 method.setAccessible(true); 113 result = method.invoke( actionInstance, parameters ); 114 } 115 finally { 116 method.setAccessible(accessible); 117 } 118 } 119 catch (IllegalArgumentException e) { 120 throw createMethodInvocationError(method, e); 121 } 122 catch (IllegalAccessException e) { 123 throw createMethodInvocationError(method, e); 124 } 125 catch (InvocationTargetException e) { 126 throw createMethodInvocationError(method, e); 127 } 128 return result; 129 } 130 131 private MethodExecutionException createMethodInvocationError(Method method, Throwable e) { 132 return MethodExecutionException.forMethodInvocationError( method, e ); 133 } 134 135 }