Github user yew1eb commented on a diff in the pull request: https://github.com/apache/flink/pull/4826#discussion_r145294253 --- Diff: flink-streaming-java/src/main/java/org/apache/flink/streaming/util/latency/LatencyHistogramStatistics.java --- @@ -0,0 +1,71 @@ +/* + * 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.flink.streaming.util.latency; + +import org.apache.flink.metrics.HistogramStatistics; + +import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics; + + +/** + * Latency histogram statistics implementation returned by {@link LatencyHistogram}. + * The statistics class wraps a {@link DescriptiveStatistics} instance and forwards the method calls accordingly. + */ +public class LatencyHistogramStatistics extends HistogramStatistics { + private final DescriptiveStatistics latencyHistogram; + + public LatencyHistogramStatistics(DescriptiveStatistics latencyHistogram) { + this.latencyHistogram = latencyHistogram; + } + + @Override + public double getQuantile(double quantile) { + return latencyHistogram.getPercentile(quantile); + } + + @Override + public long[] getValues() { + // Due to latencyHistogram.getValues() return double[] + throw new UnsupportedOperationException(); --- End diff -- yes, will change.
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