| /* |
| * 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.wayang.java.operators; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| import org.apache.wayang.core.types.DataSetType; |
| import org.apache.wayang.java.channels.JavaChannelInstance; |
| |
| import java.util.List; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| /** |
| * Test suite for {@link JavaReservoirSampleOperator}. |
| */ |
| public class JavaReservoirSampleOperatorTest extends JavaExecutionOperatorTestBase { |
| |
| @Test |
| public void testExecution() { |
| // Prepare test data. |
| Stream<Integer> inputStream = Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); |
| final int sampleSize = 5; |
| |
| // Build the distinct operator. |
| JavaReservoirSampleOperator<Integer> sampleOperator = |
| new JavaReservoirSampleOperator<>( |
| iterationNumber -> sampleSize, |
| DataSetType.createDefaultUnchecked(Integer.class), |
| iterationNumber -> 42L |
| ); |
| sampleOperator.setDatasetSize(10); |
| |
| JavaChannelInstance[] inputs = new JavaChannelInstance[]{createStreamChannelInstance(inputStream)}; |
| JavaChannelInstance[] outputs = new JavaChannelInstance[]{createCollectionChannelInstance()}; |
| |
| // Execute. |
| evaluate(sampleOperator, inputs, outputs); |
| |
| // Verify the outcome. |
| final List<Integer> result = outputs[0].<Integer>provideStream().collect(Collectors.toList()); |
| Assert.assertEquals(sampleSize, result.size()); |
| } |
| |
| @Test |
| public void testLargerSampleExecution() { |
| // Prepare test data. |
| Stream<Integer> inputStream = Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); |
| |
| // Build the distinct operator. |
| JavaRandomSampleOperator<Integer> sampleOperator = |
| new JavaRandomSampleOperator<>( |
| iterationNumber -> 15, // sample size larger than dataset size |
| DataSetType.createDefaultUnchecked(Integer.class), |
| iteration -> 42L |
| ); |
| sampleOperator.setDatasetSize(10); |
| |
| JavaChannelInstance[] inputs = new JavaChannelInstance[]{createStreamChannelInstance(inputStream)}; |
| JavaChannelInstance[] outputs = new JavaChannelInstance[]{createStreamChannelInstance()}; |
| |
| // Execute. |
| evaluate(sampleOperator, inputs, outputs); |
| |
| // Verify the outcome. |
| final List<Integer> result = outputs[0].<Integer>provideStream().collect(Collectors.toList()); |
| Assert.assertEquals(10, result.size()); |
| |
| } |
| |
| } |