org.wicketstuff.lazymodel.reflect.CachingMethodResolver.java Source code

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Here is the source code for org.wicketstuff.lazymodel.reflect.CachingMethodResolver.java

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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.wicketstuff.lazymodel.reflect;

import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.wicket.Application;
import org.apache.wicket.util.lang.Generics;

/**
 * A cache of a wrapped {@link IMethodResolver}.
 * 
 * @author svenmeier
 */
public class CachingMethodResolver implements IMethodResolver {

    private final ConcurrentHashMap<Object, IMethodResolver> scopes = Generics.newConcurrentHashMap(2);

    private final IMethodResolver resolver;

    public CachingMethodResolver(IMethodResolver resolver) {
        this.resolver = resolver;
    }

    private IMethodResolver getResolver() {
        Object key;
        if (Application.exists()) {
            key = Application.get();
        } else {
            key = CachingMethodResolver.class;
        }

        IMethodResolver result = scopes.get(key);
        if (result == null) {
            IMethodResolver tmpResult = scopes.putIfAbsent(key, result = new ApplicationScope());
            if (tmpResult != null) {
                result = tmpResult;
            }
        }

        return result;
    }

    @Override
    public Method getMethod(Class<?> owner, Serializable id) {
        return getResolver().getMethod(owner, id);
    }

    @Override
    public Serializable getId(Method method) {
        return getResolver().getId(method);
    }

    @Override
    public Method getSetter(Method getter) {
        return getResolver().getSetter(getter);
    }

    public void destroy(Application application) {
        scopes.remove(application);
    }

    private class ApplicationScope implements IMethodResolver {

        private final Map<String, Method> methods = new ConcurrentHashMap<String, Method>();

        private final Map<Method, Serializable> ids = new ConcurrentHashMap<Method, Serializable>();

        private final Map<Method, Method> setters = new ConcurrentHashMap<Method, Method>();

        @Override
        public Method getMethod(Class<?> owner, Serializable id) {
            String key = owner.getName() + ":" + id;

            Method method = methods.get(key);
            if (method == null) {
                method = resolver.getMethod(owner, id);
                methods.put(key, method);
            }

            return method;
        }

        @Override
        public Serializable getId(Method method) {
            Serializable id = ids.get(method);
            if (id == null) {
                id = resolver.getId(method);
                ids.put(method, id);
            }
            return id;
        }

        @Override
        public Method getSetter(Method getter) {
            Method setter = setters.get(getter);

            if (setter == null) {
                setter = resolver.getSetter(getter);
                setters.put(getter, setter);
            }

            return setter;
        }
    }
}