| /* |
| * 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.skywalking.oap.server.core.analysis.metrics; |
| |
| import lombok.Getter; |
| import lombok.Setter; |
| import org.apache.skywalking.oap.server.core.analysis.metrics.annotation.Arg; |
| import org.apache.skywalking.oap.server.core.analysis.metrics.annotation.Entrance; |
| import org.apache.skywalking.oap.server.core.analysis.metrics.annotation.MetricsFunction; |
| import org.apache.skywalking.oap.server.core.analysis.metrics.annotation.SourceFrom; |
| import org.apache.skywalking.oap.server.core.storage.annotation.BanyanDB; |
| import org.apache.skywalking.oap.server.core.storage.annotation.Column; |
| |
| /** |
| * Histogram metrics represents the calculator for heat map. |
| * <p> |
| * It groups the given collection of values by the given step and number of steps. |
| * <p> |
| * A heat map (or heatmap) is a graphical representation of data where the individual values contained in a matrix are |
| * represented as colors. |
| */ |
| @MetricsFunction(functionName = "histogram") |
| public abstract class HistogramMetrics extends Metrics { |
| |
| public static final String DATASET = "dataset"; |
| |
| @Getter |
| @Setter |
| @Column(name = DATASET, dataType = Column.ValueDataType.HISTOGRAM, storageOnly = true, defaultValue = 0) |
| @BanyanDB.MeasureField |
| private DataTable dataset = new DataTable(30); |
| |
| /** |
| * Data will be grouped in |
| * <pre> |
| * key = 0, represents [0, 100), value = count of requests in the latency range. |
| * key = 100, represents [100, 200), value = count of requests in the latency range. |
| * ... |
| * key = step * maxNumOfSteps, represents [step * maxNumOfSteps, MAX) |
| * </pre> |
| * |
| * @param step the size of each step. A positive integer. |
| * @param maxNumOfSteps Steps are used to group incoming value. |
| */ |
| @Entrance |
| public final void combine(@SourceFrom int value, @Arg int step, @Arg int maxNumOfSteps) { |
| if (!dataset.hasData()) { |
| for (int i = 0; i <= maxNumOfSteps; i++) { |
| String key = String.valueOf(i * step); |
| dataset.put(key, 0L); |
| } |
| } |
| |
| int index = value / step; |
| if (index > maxNumOfSteps) { |
| index = maxNumOfSteps; |
| } |
| String idx = String.valueOf(index * step); |
| |
| dataset.valueAccumulation(idx, 1L); |
| } |
| |
| @Override |
| public boolean combine(Metrics metrics) { |
| HistogramMetrics histogramMetrics = (HistogramMetrics) metrics; |
| this.dataset.append(histogramMetrics.dataset); |
| return true; |
| } |
| |
| /** |
| * For Thermodynamic metrics, no single value field. Need to do nothing here. |
| */ |
| @Override |
| public final void calculate() { |
| } |
| } |