[GitHub] apex-malhar pull request #309: [APEXMALHAR-2106] Support multiple streams in...

[ilganeli <gi...@git.apache.org>]

Github user ilganeli commented on a diff in the pull request:

    https://github.com/apache/apex-malhar/pull/309#discussion_r66544129
  
    --- Diff: library/src/test/java/com/datatorrent/lib/stream/MultipleStreamMergerTest.java ---
    @@ -0,0 +1,145 @@
    +/**
    + * 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 com.datatorrent.lib.stream;
    +
    +import java.io.IOException;
    +import java.util.ArrayList;
    +
    +import javax.validation.ConstraintViolationException;
    +
    +import org.junit.Assert;
    +import org.junit.Before;
    +import org.junit.Test;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import org.apache.hadoop.conf.Configuration;
    +
    +import com.datatorrent.api.DAG;
    +import com.datatorrent.api.LocalMode;
    +import com.datatorrent.api.StreamingApplication;
    +import com.datatorrent.lib.io.ConsoleOutputOperator;
    +import com.datatorrent.lib.testbench.RandomWordGenerator;
    +
    +import static org.junit.Assert.assertEquals;
    +
    +public class MultipleStreamMergerTest {
    +  private static Logger LOG = LoggerFactory.getLogger(MultipleStreamMergerTest.class);
    +
    +  StreamMerger<byte[]> finalMerger;
    +  ArrayList<MultipleStreamMerger<byte[]>.Stream> streamsToAddToDag;
    +  ArrayList<MultipleStreamMerger<byte[]>.NamedMerger> operatorsToAdd;
    +
    +  @Before
    +  public void setUp() throws Exception
    +  {
    +    finalMerger = new StreamMerger<>();
    +    streamsToAddToDag = new ArrayList<>();
    +    operatorsToAdd = new ArrayList<>();
    +
    +  }
    +
    +  @Test
    +  public void mergeTwoStreams()
    +  {
    +    RandomWordGenerator randomWordGenerator = new RandomWordGenerator();
    +    RandomWordGenerator randomWordGenerator2 = new RandomWordGenerator();
    +
    +    randomWordGenerator.setTuplesPerWindow(1);
    +    randomWordGenerator2.setTuplesPerWindow(1);
    +
    +    MultipleStreamMerger<byte[]> merger = new MultipleStreamMerger<>();
    +    merger.merge(randomWordGenerator.output)
    +        .merge(randomWordGenerator2.output);
    +
    +    merger.constructMergeTree(streamsToAddToDag, operatorsToAdd);
    +
    +    assertEquals("Count of created streams", 2, streamsToAddToDag.size());
    +    assertEquals("Count of created operators", 1, operatorsToAdd.size());
    +
    +    // Next check actual connections
    +    assertEquals("Generator 1 stream", randomWordGenerator.output,
    +        streamsToAddToDag.get(0).sourcePort);
    +
    +    assertEquals("Generator 2 stream", randomWordGenerator2.output,
    +        streamsToAddToDag.get(1).sourcePort);
    +
    +    assertEquals("Final operator input_1", operatorsToAdd.get(0).merger.data1, streamsToAddToDag.get(0).destPort);
    +    assertEquals("Final operator input_2", operatorsToAdd.get(0).merger.data2, streamsToAddToDag.get(1).destPort);
    +  }
    +
    +  @Test(expected = IllegalArgumentException.class)
    +  public void mergeOneStream()
    +  {
    +    RandomWordGenerator randomWordGenerator = new RandomWordGenerator();
    +    MultipleStreamMerger<byte[]> merger = new MultipleStreamMerger<>();
    +    merger.merge(randomWordGenerator.output);
    +    merger.constructMergeTree(streamsToAddToDag, operatorsToAdd);
    +  }
    +
    +  @Test(expected = IllegalArgumentException.class)
    +  public void mergeZeroStream()
    +  {
    +    RandomWordGenerator randomWordGenerator = new RandomWordGenerator();
    +    MultipleStreamMerger<byte[]> merger = new MultipleStreamMerger<>();
    +    merger.constructMergeTree(streamsToAddToDag, operatorsToAdd);
    +  }
    +
    +  static class Application implements StreamingApplication
    +  {
    +    @Override
    +    public void populateDAG(DAG dag, Configuration conf)
    +    {
    +      LOG.debug("Application - PopulateDAG");
    +      int count = 53;
    +      RandomWordGenerator[] generators = new RandomWordGenerator[count];
    +      MultipleStreamMerger<byte[]> merger = new MultipleStreamMerger<>();
    +      for (int i = 0; i < count; i++) {
    +        generators[i] = new RandomWordGenerator();
    +        generators[i].setTuplesPerWindow(1);
    +        dag.addOperator("Generator " + i, generators[i]);
    +        merger.merge(generators[i].output);
    +      }
    +
    +      merger.insertInto(dag, conf);
    +
    +      // This should connect all the relevant ports
    +      dag.addModule("Merger", merger);
    +
    +      // And then we should see the output
    +      ConsoleOutputOperator consoleOperator = dag.addOperator("console", new ConsoleOutputOperator());
    +      dag.addStream("merger-console", merger.streamOutput, consoleOperator.input);
    +    }
    +  }
    +
    +  @Test
    +  public void testApplication() throws IOException, Exception {
    --- End diff --
    
    Done - i've added a test that confirms all inputs received at output match the input.


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