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/* LatencyTracker.java
 * 
 * Copyright 2009-2012 Comcast Interactive Media, LLC.
 * 
 * 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 org.fishwife.jrugged;

import java.util.concurrent.Callable;

/** This is a statistics wrapper that records the latency of requests,
 *  both for successes and failures. The most recent measurement is
 *  available for query, and can be polled periodically to determine 
 *  average latencies. 
 */
public class LatencyTracker implements ServiceWrapper {
    private long lastSuccessMillis;
    private long lastFailureMillis;

    public  T invoke(Callable c) throws Exception {
		long start = System.currentTimeMillis();
		try {
			T result = c.call();
			lastSuccessMillis = System.currentTimeMillis() - start;
			return result;
		} catch (Exception e) {
			lastFailureMillis = System.currentTimeMillis() - start;
			throw e;
		}
    }

    public void invoke(Runnable r) throws Exception {
		long start = System.currentTimeMillis();
		try {
			r.run();
			lastSuccessMillis = System.currentTimeMillis() - start;
		} catch (Exception e) {
			lastFailureMillis = System.currentTimeMillis() - start;
			throw e;
		}
    }

    public  T invoke(Runnable r, T result) throws Exception {
		long start = System.currentTimeMillis();
		try {
			r.run();
			lastSuccessMillis = System.currentTimeMillis() - start;
			return result;
		} catch (Exception e) {
			lastFailureMillis = System.currentTimeMillis() - start;
			throw e;
		}
    }

	/** Returns how long the last successful request took.
	 *  @return long request service time in milliseconds */
    public long getLastSuccessMillis() { return lastSuccessMillis; }

	/** Returns how long the last failed request took.
	 *  @return long request service time in milliseconds. */
    public long getLastFailureMillis() { return lastFailureMillis; }
}