| /* |
| * 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.basic.operators; |
| |
| |
| import static org.mockito.Mockito.mock; |
| import static org.mockito.Mockito.when; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.net.URISyntaxException; |
| import java.net.URL; |
| import java.util.Optional; |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| import org.apache.wayang.commons.util.profiledb.instrumentation.StopWatch; |
| import org.apache.wayang.commons.util.profiledb.model.Experiment; |
| import org.apache.wayang.commons.util.profiledb.model.Subject; |
| import org.apache.wayang.core.api.Configuration; |
| import org.apache.wayang.core.api.Job; |
| import org.apache.wayang.core.optimizer.DefaultOptimizationContext; |
| import org.apache.wayang.core.optimizer.cardinality.CardinalityEstimate; |
| import org.apache.wayang.core.optimizer.cardinality.CardinalityEstimator; |
| import org.junit.Assert; |
| import org.junit.Test; |
| |
| /** |
| * Test suite for {@link TextFileSource}. |
| */ |
| public class TextFileSourceTest { |
| |
| private final Logger logger = LogManager.getLogger(this.getClass()); |
| |
| @Test |
| public void testCardinalityEstimation() throws URISyntaxException, IOException { |
| Job job = mock(Job.class); |
| DefaultOptimizationContext optimizationContext = mock(DefaultOptimizationContext.class); |
| when(job.getOptimizationContext()).thenReturn(optimizationContext); |
| when(optimizationContext.getJob()).thenReturn(job); |
| when(job.getStopWatch()).thenReturn(new StopWatch(new Experiment("mock", new Subject("mock", "mock")))); |
| when(optimizationContext.getConfiguration()).thenReturn(new Configuration()); |
| final URL testFile = this.getClass().getResource("/ulysses.input"); |
| final TextFileSource textFileSource = new TextFileSource(testFile.toString()); |
| |
| final BufferedReader bufferedReader = new BufferedReader( |
| new InputStreamReader( |
| new FileInputStream(new File(testFile.toURI())), |
| textFileSource.getEncoding() |
| ) |
| ); |
| |
| // Read as much as possible. |
| char[] cbuf = new char[1024]; |
| int numReadChars, numLineFeeds = 0; |
| while ((numReadChars = bufferedReader.read(cbuf)) != -1) { |
| for (int i = 0; i < numReadChars; i++) { |
| if (cbuf[i] == '\n') { |
| numLineFeeds++; |
| } |
| } |
| } |
| |
| final Optional<CardinalityEstimator> cardinalityEstimator = textFileSource |
| .createCardinalityEstimator(0, optimizationContext.getConfiguration()); |
| |
| Assert.assertTrue(cardinalityEstimator.isPresent()); |
| final CardinalityEstimate estimate = cardinalityEstimator.get().estimate(optimizationContext); |
| |
| this.logger.info("Estimated between {} and {} lines in {} and counted {}.", |
| estimate.getLowerEstimate(), |
| estimate.getUpperEstimate(), |
| testFile, |
| numLineFeeds); |
| |
| Assert.assertTrue(estimate.getLowerEstimate() <= numLineFeeds); |
| Assert.assertTrue(estimate.getUpperEstimate() >= numLineFeeds); |
| } |
| |
| } |