/* * 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 software.amazon.flink.example.source; import java.time.Instant; public class SineSourceFunction extends DataGenSourceFunction { private static final long PERIOD = 60 * 60 * 1000; private static final long SCALE = 50; private static final double TWO_PI = Math.PI * 2; public SineSourceFunction(final String category) { super(category); } @Override long getValue(Instant timestamp) { double radians = TWO_PI / PERIOD * (timestamp.toEpochMilli() % PERIOD); double y = Math.sin(radians) * SCALE + SCALE; return (long) y; } }