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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.sirona.aop;

import org.apache.commons.proxy.Invoker;
import org.apache.commons.proxy.ProxyFactory;
import org.apache.sirona.configuration.ioc.IoCs;
import org.apache.sirona.util.ClassLoaders;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public final class SironaProxyFactory {
    public static  T monitor(final Class clazz, final Object instance) {
        return clazz.cast(
            IoCs.findOrCreateInstance(ProxyFactory.class)
                .createInvokerProxy(ClassLoaders.current(), new SironaPerformanceHandler(instance), new Class[]{clazz}));
    }

    private SironaProxyFactory() {
        // no-op
    }

    private static class SironaPerformanceHandler extends AbstractPerformanceInterceptor implements Invoker {
        private final Object instance;

        public SironaPerformanceHandler(final Object instance) {
            this.instance = instance;
        }

        @Override
        public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
            return doInvoke(new Invocation(instance, method, args));
        }

        @Override
        protected Object proceed(final Invocation invocation) throws Throwable {
            try {
                return invocation.method.invoke(invocation.target, invocation.args);
            } catch (final InvocationTargetException ite) {
                throw ite.getCause();
            }
        }

        @Override
        protected String getCounterName(final Invocation invocation) {
            return getCounterName(invocation.target, invocation.method);
        }

        @Override
        protected Object extractContextKey(final Invocation invocation) {
            return new SerializableMethod(invocation.method);
        }
    }

    private static class Invocation {
        private final Object target;
        private final Method method;
        private final Object[] args;

        private Invocation(final Object target, final Method method, final Object[] args) {
            this.target = target;
            this.method = method;
            this.args = args;
        }
    }
}