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/**
 * Copyright 2013 Netflix, Inc.
 *
 * 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.netflix.servo.monitor;

import java.util.concurrent.TimeUnit;

/**
 * Measures the time taken for execution of some code.
 */
public interface Stopwatch {

    /** Mark the start time. */
    void start();

    /** Mark the end time. */
    void stop();

    /** Reset the stopwatch so that it can be used again. */
    void reset();

    /** Returns the duration in the specified time unit. */
    long getDuration(TimeUnit timeUnit);

    /** Returns the duration in nanoseconds. */
    long getDuration();
}