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Add sum/max/min reducers in Scala (#3133)
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48 changes: 48 additions & 0 deletions
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heron/api/src/scala/org/apache/heron/streamlet/scala/StreamletReducers.scala
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| /** | ||
| * 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.heron.streamlet.scala | ||
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| /** | ||
| * This class contains a few standard reduces that can be used with | ||
| * Streamlet reduce functions such as reduceByKeyAndWindow. | ||
| * Example, assuming s is a Stringlet<T> object and each tuple has these functions: | ||
| * - Integer getKey() and | ||
| * - Double getValue() | ||
| * To get streams of sum, min and max of all values upto the current one: | ||
| * s.reduceByKey(T::getKey, T::getValue, StreamletReducers::sum); | ||
| * s.reduceByKey(T::getKey, T::getValue, StreamletReducers::min); | ||
| * s.reduceByKey(T::getKey, T::getValue, StreamletReducers::max); | ||
| */ | ||
| object StreamletReducers { | ||
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| def sum(a: Int, b: Int): Int = a + b | ||
| def sum(a: Long, b: Long): Long = a + b | ||
| def sum(a: Float, b: Float): Float = a + b | ||
| def sum(a: Double, b: Double): Double = a + b | ||
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| def max(a: Int, b: Int): Int = math.max(a, b) | ||
| def max(a: Long, b: Long): Long = math.max(a, b) | ||
| def max(a: Float, b: Float): Float = math.max(a, b) | ||
| def max(a: Double, b: Double): Double = math.max(a, b) | ||
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| def min(a: Int, b: Int): Int = math.min(a, b) | ||
| def min(a: Long, b: Long): Long = math.min(a, b) | ||
| def min(a: Float, b: Float): Float = math.min(a, b) | ||
| def min(a: Double, b: Double): Double = math.min(a, b) | ||
| } |
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heron/api/tests/scala/org/apache/heron/streamlet/scala/StreamletReducersTest.scala
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| /** | ||
| * 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.heron.streamlet.scala | ||
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| import org.junit.Assert.assertEquals | ||
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| import org.apache.heron.streamlet.scala.common.BaseFunSuite | ||
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| class StreamletReducersTest extends BaseFunSuite { | ||
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| test("Sum should work correctly") { | ||
| assertEquals(StreamletReducers.sum(1, 2), 3) | ||
| assertEquals(StreamletReducers.sum(1L, 2L), 3L) | ||
| assertEquals(StreamletReducers.sum(1.0f, 2.0f), 3.0f, 0.01f) | ||
| assertEquals(StreamletReducers.sum(1.0, 2.0), 3.0, 0.01) | ||
| } | ||
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| test("Max should work correctly") { | ||
| assertEquals(StreamletReducers.max(1, 2), 2) | ||
| assertEquals(StreamletReducers.max(2, 1), 2) | ||
| assertEquals(StreamletReducers.max(1L, 2L), 2L) | ||
| assertEquals(StreamletReducers.max(2L, 1L), 2L) | ||
| assertEquals(StreamletReducers.max(1.0f, 2.0f), 2.0f, 0.01f) | ||
| assertEquals(StreamletReducers.max(2.0f, 1.0f), 2.0f, 0.01f) | ||
| assertEquals(StreamletReducers.max(1.0, 2.0), 2.0, 0.01) | ||
| assertEquals(StreamletReducers.max(2.0, 1.0), 2.0, 0.01) | ||
| } | ||
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| test("Min should work correctly") { | ||
| assertEquals(StreamletReducers.min(1, 2), 1) | ||
| assertEquals(StreamletReducers.min(2, 1), 1) | ||
| assertEquals(StreamletReducers.min(1L, 2L), 1L) | ||
| assertEquals(StreamletReducers.min(2L, 1L), 1L) | ||
| assertEquals(StreamletReducers.min(1.0f, 2.0f), 1.0f, 0.01f) | ||
| assertEquals(StreamletReducers.min(2.0f, 1.0f), 1.0f, 0.01f) | ||
| assertEquals(StreamletReducers.min(1.0, 2.0), 1.0, 0.01) | ||
| assertEquals(StreamletReducers.min(2.0, 1.0), 1.0, 0.01) | ||
| } | ||
| } |
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