/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.hadoop.metrics2;
/**
* Metrics Histogram interface. Implementing classes will expose computed
* quartile values through the metrics system.
*/
public interface MetricHistogram {
//Strings used to create metrics names.
static final String NUM_OPS_METRIC_NAME = "_num_ops";
static final String MIN_METRIC_NAME = "_min";
static final String MAX_METRIC_NAME = "_max";
static final String MEAN_METRIC_NAME = "_mean";
static final String MEDIAN_METRIC_NAME = "_median";
static final String SEVENTY_FIFTH_PERCENTILE_METRIC_NAME = "_75th_percentile";
static final String NINETY_FIFTH_PERCENTILE_METRIC_NAME = "_95th_percentile";
static final String NINETY_NINETH_PERCENTILE_METRIC_NAME = "_99th_percentile";
/**
* Add a single value to a histogram's stream of values.
* @param value
*/
void add(long value);
}