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Database migration tool for Cassandra

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/**
 * File     : StopWatch.java
 * License  :
 *   Original   - Copyright (c) 2010 - 2016 Boxfuse GmbH
 *   Derivative - Copyright (c) 2016 - 2017 Citadel Technology Solutions Pte Ltd
 *
 *   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.builtamont.cassandra.migration.internal.util;

import java.util.concurrent.TimeUnit;

/**
 * Stop watch, inspired by the implementation in the Spring framework.
 */
public class StopWatch {

    /**
     * The timestamp at which the stopwatch was started.
     */
    private long start;

    /**
     * The timestamp at which the stopwatch was stopped.
     */
    private long stop;

    /**
     * Starts the stop watch.
     */
    public void start() {
        start = System.nanoTime();
    }

    /**
     * Stop the sto watch.
     */
    public void stop() {
        stop = System.nanoTime();
    }

    /**
     * @return The total run time in millis of the stop watch between start and stop calls.
     */
    public long getTotalTimeMillis() {
        return TimeUnit.NANOSECONDS.toMillis(stop - start);
    }
}