/* * 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.beam.sdk.io.gcp.datastore; import org.apache.beam.sdk.transforms.Sum; import org.apache.beam.sdk.util.MovingFunction; class MovingAverage { private final MovingFunction sum; private final MovingFunction count; public MovingAverage( long samplePeriodMs, long sampleUpdateMs, int numSignificantBuckets, int numSignificantSamples) { sum = new MovingFunction( samplePeriodMs, sampleUpdateMs, numSignificantBuckets, numSignificantSamples, Sum.ofLongs()); count = new MovingFunction( samplePeriodMs, sampleUpdateMs, numSignificantBuckets, numSignificantSamples, Sum.ofLongs()); } public void add(long nowMsSinceEpoch, long value) { sum.add(nowMsSinceEpoch, value); count.add(nowMsSinceEpoch, 1); } public long get(long nowMsSinceEpoch) { return sum.get(nowMsSinceEpoch) / count.get(nowMsSinceEpoch); } public boolean hasValue(long nowMsSinceEpoch) { return sum.isSignificant() && count.isSignificant() && count.get(nowMsSinceEpoch) > 0; } }