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/*
 * 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.camel.component.bean;

import java.lang.reflect.Method;
import java.util.Map;

import org.apache.camel.CamelContext;
import org.apache.camel.support.LRUCacheFactory;

/**
 * Represents a cache of {@link MethodInfo} objects to avoid the expense of introspection for each invocation of a
 * method via a proxy.
 */
public class MethodInfoCache {
    private final CamelContext camelContext;
    private final Map methodCache;
    private final Map, BeanInfo> classCache;

    public MethodInfoCache(CamelContext camelContext) {
        this(camelContext, 1000, 10000);
    }

    public MethodInfoCache(CamelContext camelContext, int classCacheSize, int methodCacheSize) {
        this(camelContext, createClassCache(classCacheSize), createMethodCache(methodCacheSize));
    }

    public MethodInfoCache(CamelContext camelContext, Map, BeanInfo> classCache, Map methodCache) {
        this.camelContext = camelContext;
        this.classCache = classCache;
        this.methodCache = methodCache;
    }

    public MethodInfo getMethodInfo(Method method) {
        return methodCache.computeIfAbsent(method, this::createMethodInfo);
    }

    protected MethodInfo createMethodInfo(Method method) {
        Class declaringClass = method.getDeclaringClass();
        BeanInfo info = getBeanInfo(declaringClass);
        return info.getMethodInfo(method);
    }

    protected BeanInfo getBeanInfo(Class declaringClass) {
        return classCache.computeIfAbsent(declaringClass, this::createBeanInfo);
    }

    protected BeanInfo createBeanInfo(Class declaringClass) {
        return new BeanInfo(camelContext, declaringClass);
    }

    @SuppressWarnings("unchecked")
    protected static  Map createLruCache(int size) {
        // use a soft cache
        return LRUCacheFactory.newLRUSoftCache(size);
    }

    private static Map, BeanInfo> createClassCache(int size) {
        return createLruCache(size);
    }

    private static Map createMethodCache(int size) {
        return createLruCache(size);
    }
}