| /* |
| * 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.felix.dm; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.lang.reflect.Proxy; |
| import java.util.Arrays; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| |
| /** |
| * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a> |
| */ |
| public class InvocationUtil { |
| private static final Map /* <Key, Method> */ m_methodCache; |
| static { |
| int size = 2048; |
| try { |
| String value = System.getProperty(DependencyManager.METHOD_CACHE_SIZE); |
| if (value != null) { |
| size = Integer.parseInt(value); |
| } |
| } |
| catch (Exception e) {} |
| m_methodCache = new LRUMap(Math.max(size, 64)); |
| } |
| |
| public static Object invokeCallbackMethod(Object instance, String methodName, Class[][] signatures, Object[][] parameters) throws NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException { |
| Class currentClazz = instance.getClass(); |
| while (currentClazz != null) { |
| try { |
| return invokeMethod(instance, currentClazz, methodName, signatures, parameters, false); |
| } |
| catch (NoSuchMethodException nsme) { |
| // ignore |
| } |
| currentClazz = currentClazz.getSuperclass(); |
| } |
| throw new NoSuchMethodException(methodName); |
| } |
| |
| public static Object invokeMethod(Object object, Class clazz, String name, Class[][] signatures, Object[][] parameters, boolean isSuper) throws NoSuchMethodException, InvocationTargetException, IllegalArgumentException, IllegalAccessException { |
| if (object == null) { |
| throw new IllegalArgumentException("Instance cannot be null"); |
| } |
| if (clazz == null) { |
| throw new IllegalArgumentException("Class cannot be null"); |
| } |
| |
| // if we're talking to a proxy here, dig one level deeper to expose the |
| // underlying invocation handler (we do the same for injecting instances) |
| if (Proxy.isProxyClass(clazz)) { |
| object = Proxy.getInvocationHandler(object); |
| clazz = object.getClass(); |
| } |
| |
| Method m = null; |
| for (int i = 0; i < signatures.length; i++) { |
| Class[] signature = signatures[i]; |
| m = getDeclaredMethod(clazz, name, signature, isSuper); |
| if (m != null) { |
| return m.invoke(object, parameters[i]); |
| } |
| } |
| throw new NoSuchMethodException(name); |
| } |
| |
| private static Method getDeclaredMethod(Class clazz, String name, Class[] signature, boolean isSuper) { |
| // first check our cache |
| Key key = new Key(clazz, name, signature); |
| Method m = null; |
| synchronized (m_methodCache) { |
| m = (Method) m_methodCache.get(key); |
| if (m != null) { |
| return m; |
| } |
| else if (m_methodCache.containsKey(key)) { |
| // the key is in our cache, it just happens to have a null value |
| return null; |
| } |
| } |
| // then do a lookup |
| try { |
| m = clazz.getDeclaredMethod(name, signature); |
| if (!(isSuper && Modifier.isPrivate(m.getModifiers()))) { |
| m.setAccessible(true); |
| } |
| } |
| catch (NoSuchMethodException e) { |
| // ignore |
| } |
| synchronized (m_methodCache) { |
| m_methodCache.put(key, m); |
| } |
| return m; |
| } |
| |
| public static class Key { |
| private final Class m_clazz; |
| private final String m_name; |
| private final Class[] m_signature; |
| |
| public Key(Class clazz, String name, Class[] signature) { |
| m_clazz = clazz; |
| m_name = name; |
| m_signature = signature; |
| } |
| |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| result = prime * result + ((m_clazz == null) ? 0 : m_clazz.hashCode()); |
| result = prime * result + ((m_name == null) ? 0 : m_name.hashCode()); |
| result = prime * result + Arrays.hashCode(m_signature); |
| return result; |
| } |
| |
| public boolean equals(Object obj) { |
| if (this == obj) |
| return true; |
| if (obj == null) |
| return false; |
| if (getClass() != obj.getClass()) |
| return false; |
| Key other = (Key) obj; |
| if (m_clazz == null) { |
| if (other.m_clazz != null) |
| return false; |
| } |
| else if (!m_clazz.equals(other.m_clazz)) |
| return false; |
| if (m_name == null) { |
| if (other.m_name != null) |
| return false; |
| } |
| else if (!m_name.equals(other.m_name)) |
| return false; |
| if (!Arrays.equals(m_signature, other.m_signature)) |
| return false; |
| return true; |
| } |
| } |
| |
| public static class LRUMap extends LinkedHashMap { |
| private final int m_size; |
| |
| public LRUMap(int size) { |
| m_size = size; |
| } |
| |
| protected boolean removeEldestEntry(java.util.Map.Entry eldest) { |
| return size() > m_size; |
| } |
| } |
| } |