| /** |
| * 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. |
| String NUM_OPS_METRIC_NAME = "_num_ops"; |
| String MIN_METRIC_NAME = "_min"; |
| String MAX_METRIC_NAME = "_max"; |
| String MEAN_METRIC_NAME = "_mean"; |
| String MEDIAN_METRIC_NAME = "_median"; |
| String TWENTY_FIFTH_PERCENTILE_METRIC_NAME = "_25th_percentile"; |
| String SEVENTY_FIFTH_PERCENTILE_METRIC_NAME = "_75th_percentile"; |
| String NINETIETH_PERCENTILE_METRIC_NAME = "_90th_percentile"; |
| String NINETY_FIFTH_PERCENTILE_METRIC_NAME = "_95th_percentile"; |
| String NINETY_EIGHTH_PERCENTILE_METRIC_NAME = "_98th_percentile"; |
| String NINETY_NINETH_PERCENTILE_METRIC_NAME = "_99th_percentile"; |
| String NINETY_NINE_POINT_NINETH_PERCENTILE_METRIC_NAME = "_99.9th_percentile"; |
| |
| /** |
| * Add a single value to a histogram's stream of values. |
| * @param value |
| */ |
| void add(long value); |
| |
| } |