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.LRUSoftCache;
024    
025    /**
026     * Represents a cache of {@link MethodInfo} objects to avoid the expense of introspection for each
027     * invocation of a method via a proxy.
028     *
029     * @version 
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, createClassCache(classCacheSize), createMethodCache(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 <K, V> Map<K, V> createLruCache(int size) {
079            // use a soft cache
080            return new LRUSoftCache<K, V>(size);
081        }
082    
083        private static Map<Class<?>, BeanInfo> createClassCache(int size) {
084            return createLruCache(size);
085        }
086    
087        private static Map<Method, MethodInfo> createMethodCache(int size) {
088            return createLruCache(size);
089        }
090    }