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/*
 * (c) Copyright 2018 Palantir Technologies Inc. All rights reserved.
 *
 * Licensed 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 com.palantir.common.proxy;

import com.palantir.logsafe.Preconditions;
import com.palantir.util.jmx.OperationTimer;
import com.palantir.util.jmx.OperationTimer.TimingState;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

@SuppressWarnings("ProxyNonConstantType")
public final class TimingProxy implements DelegatingInvocationHandler {

    @SuppressWarnings("unchecked")
    public static  T newProxyInstance(Class interfaceClass, T delegate, OperationTimer timer) {
        return (T) Proxy.newProxyInstance(
                interfaceClass.getClassLoader(), new Class[] {interfaceClass}, new TimingProxy(delegate, timer));
    }

    private final Object delegate;
    private final OperationTimer timer;

    private TimingProxy(Object delegate, OperationTimer timer) {
        Preconditions.checkNotNull(delegate);
        Preconditions.checkNotNull(timer);
        this.delegate = delegate;
        this.timer = timer;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        TimingState token = timer.begin(method.getName());
        try {
            return method.invoke(delegate, args);
        } catch (InvocationTargetException e) {
            throw e.getCause();
        } finally {
            token.end();
        }
    }

    @Override
    public Object getDelegate() {
        return delegate;
    }
}