001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.component.bean;
018
019 import java.lang.reflect.Method;
020 import java.util.Map;
021
022 import org.apache.camel.CamelContext;
023 import org.apache.camel.util.LRUCache;
024
025 /**
026 * Represents a cache of MethodInfo objects to avoid the expense of introspection for each invocation of a method
027 * via a proxy
028 *
029 * @version $Revision: 689343 $
030 */
031 public class MethodInfoCache {
032 private final CamelContext camelContext;
033 private Map<Method, MethodInfo> methodCache;
034 private Map<Class, BeanInfo> classCache;
035
036 public MethodInfoCache(CamelContext camelContext) {
037 this(camelContext, 1000, 10000);
038 }
039
040 public MethodInfoCache(CamelContext camelContext, int classCacheSize, int methodCacheSize) {
041 this(camelContext, createLruCache(classCacheSize), createLruCache(methodCacheSize));
042 }
043
044 public MethodInfoCache(CamelContext camelContext, Map<Class, BeanInfo> classCache, Map<Method, MethodInfo> methodCache) {
045 this.camelContext = camelContext;
046 this.classCache = classCache;
047 this.methodCache = methodCache;
048 }
049
050 public synchronized MethodInfo getMethodInfo(Method method) {
051 MethodInfo answer = methodCache.get(method);
052 if (answer == null) {
053 answer = createMethodInfo(method);
054 methodCache.put(method, answer);
055 }
056 return answer;
057 }
058
059 protected MethodInfo createMethodInfo(Method method) {
060 Class<?> declaringClass = method.getDeclaringClass();
061 BeanInfo info = getBeanInfo(declaringClass);
062 return info.getMethodInfo(method);
063 }
064
065 protected synchronized BeanInfo getBeanInfo(Class<?> declaringClass) {
066 BeanInfo beanInfo = classCache.get(declaringClass);
067 if (beanInfo == null) {
068 beanInfo = createBeanInfo(declaringClass);
069 classCache.put(declaringClass, beanInfo);
070 }
071 return beanInfo;
072 }
073
074 protected BeanInfo createBeanInfo(Class<?> declaringClass) {
075 return new BeanInfo(camelContext, declaringClass);
076 }
077
078 protected static Map createLruCache(int size) {
079 return new LRUCache(size);
080 }
081 }