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.CastUtils;
024    import org.apache.camel.util.LRUSoftCache;
025    
026    /**
027     * Represents a cache of {@link MethodInfo} objects to avoid the expense of introspection for each
028     * invocation of a method via a proxy.
029     *
030     * @version 
031     */
032    public class MethodInfoCache {
033        private final CamelContext camelContext;
034        private Map<Method, MethodInfo> methodCache;
035        private Map<Class<?>, BeanInfo> classCache;
036    
037        public MethodInfoCache(CamelContext camelContext) {
038            this(camelContext, 1000, 10000);
039        }
040    
041        public MethodInfoCache(CamelContext camelContext, int classCacheSize, int methodCacheSize) {
042            this(camelContext, createClassCache(classCacheSize), createMethodCache(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<Object, Object> createLruCache(int size) {
080            // use a soft cache
081            return new LRUSoftCache<Object, Object>(size);
082        }
083    
084        private static Map<Class<?>, BeanInfo> createClassCache(int size) {
085            return CastUtils.cast(createLruCache(size));
086        }
087    
088        private static Map<Method, MethodInfo> createMethodCache(int size) {
089            return CastUtils.cast(createLruCache(size));
090        }
091    }