/*
 * Copyright 2020-2022 Equinix, Inc
 * Copyright 2014-2022 The Billing Project, LLC
 *
 * The Billing Project 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.killbill.commons.metrics.api;

import java.util.concurrent.TimeUnit;

/**
 * A timer metric which aggregates timing durations and provides duration statistics, plus
 * throughput statistics.
 */
public interface Timer extends Metered, Sampling {

    /**
     * Returns the number of events which have been marked.
     *
     * @return the number of events which have been marked
     */
    long getCount();

    /**
     * Adds a recorded duration.
     *
     * @param duration the length of the duration
     * @param unit     the scale unit of {@code duration}
     */
    void update(long duration, TimeUnit unit);
}
