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: 747062 $
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        @SuppressWarnings("unchecked")
041        public MethodInfoCache(CamelContext camelContext, int classCacheSize, int methodCacheSize) {
042            this(camelContext, createLruCache(classCacheSize), createLruCache(methodCacheSize));
043        }
044    
045        public MethodInfoCache(CamelContext camelContext, Map<Class, BeanInfo> classCache, Map<Method, MethodInfo> methodCache) {
046            this.camelContext = camelContext;
047            this.classCache = classCache;
048            this.methodCache = methodCache;
049        }
050    
051        public synchronized MethodInfo getMethodInfo(Method method) {
052            MethodInfo answer = methodCache.get(method);
053            if (answer == null) {
054                answer = createMethodInfo(method);
055                methodCache.put(method, answer);
056            }
057            return answer;
058        }
059    
060        protected  MethodInfo createMethodInfo(Method method) {
061            Class<?> declaringClass = method.getDeclaringClass();
062            BeanInfo info = getBeanInfo(declaringClass);
063            return info.getMethodInfo(method);
064        }
065    
066        protected synchronized BeanInfo getBeanInfo(Class<?> declaringClass) {
067            BeanInfo beanInfo = classCache.get(declaringClass);
068            if (beanInfo == null) {
069                beanInfo = createBeanInfo(declaringClass);
070                classCache.put(declaringClass, beanInfo);
071            }
072            return beanInfo;
073        }
074    
075        protected BeanInfo createBeanInfo(Class<?> declaringClass) {
076            return new BeanInfo(camelContext, declaringClass);
077        }
078    
079        protected static Map createLruCache(int size) {
080            return new LRUCache(size);
081        }
082    }