com.datatorrent.apps.ApplicationTest.java Source code

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Here is the source code for com.datatorrent.apps.ApplicationTest.java

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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 com.datatorrent.apps;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

import javax.validation.ConstraintViolationException;

import org.apache.apex.malhar.kafka.AbstractKafkaInputOperator;
import org.apache.commons.io.FileUtils;
import org.apache.hadoop.conf.Configuration;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestWatcher;
import org.junit.runner.Description;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import info.batey.kafka.unit.KafkaUnitRule;
import info.batey.kafka.unit.KafkaUnit;

import kafka.producer.KeyedMessage;

import com.datatorrent.api.LocalMode;

import static org.junit.Assert.assertTrue;

/**
 * Test the DAG declaration in local mode.
 */
public class ApplicationTest {
    private static final Logger LOG = LoggerFactory.getLogger(ApplicationTest.class);
    private static final int zkPort = 12181;
    private static final int brokerPort = 19092;
    private String outputDir;
    private String outputFilePath;
    private String topic;

    public static class TestMeta extends TestWatcher {
        public String baseDirectory;

        @Override
        protected void starting(org.junit.runner.Description description) {
            this.baseDirectory = "target/" + description.getClassName() + "/" + description.getMethodName();
        }

        @Override
        protected void finished(Description description) {
            super.finished(description);
            try {
                FileUtils.forceDelete(new File(baseDirectory));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

    @Rule
    public TestMeta testMeta = new TestMeta();

    @Before
    public void setup() throws Exception {
        outputDir = testMeta.baseDirectory + File.separator + "output";
        outputFilePath = outputDir + "/output.txt_2.0";
    }

    // test messages
    private static String[] lines = { "1|User_1|1000", "2|User_2|2000", "3|User_3|3000", "4|User_4|4000",
            "5|User_5|5000", "6|User_6|6000", "7|User_7|7000", "8|User_8|8000", "9|User_9|9000",
            "10|User_10|10000" };

    //test messages
    private static String[] lines_transformed = { "1|USER_1|1000", "2|USER_2|2000", "3|USER_3|3000",
            "4|USER_4|4000", "5|USER_5|5000", "6|USER_6|6000", "7|USER_7|7000", "8|USER_8|8000", "9|USER_9|9000",
            "10|USER_10|10000" };

    // broker port must match properties.xml
    @Rule
    public KafkaUnitRule kafkaUnitRule = new KafkaUnitRule(zkPort, brokerPort);

    @Test
    public void testApplication() throws Exception {
        try {

            // write messages to Kafka topic
            Configuration conf = getConfig();

            writeToTopic();

            // run app asynchronously; terminate after results are checked
            LocalMode.Controller lc = asyncRun(conf);

            // check for presence of output file
            chkOutput();

            // compare output lines to input
            compare();

            lc.shutdown();
        } catch (ConstraintViolationException e) {
            Assert.fail("constraint violations: " + e.getConstraintViolations());
        }
    }

    private void writeToTopic() {
        KafkaUnit ku = kafkaUnitRule.getKafkaUnit();
        ku.createTopic(topic);
        for (String line : lines) {
            KeyedMessage<String, String> kMsg = new KeyedMessage<>(topic, line);
            ku.sendMessages(kMsg);
        }
        LOG.debug("Sent messages to topic {}", topic);
    }

    private Configuration getConfig() {
        Configuration conf = new Configuration(false);
        conf.addResource(this.getClass().getResourceAsStream("/META-INF/properties-test.xml"));
        conf.set("dt.operator.fileOutput.prop.filePath", outputDir);
        topic = conf.get("dt.operator.kafkaInput.prop.topics");

        return conf;
    }

    private LocalMode.Controller asyncRun(Configuration conf) throws Exception {

        LocalMode lma = LocalMode.newInstance();
        lma.prepareDAG(new Application(), conf);
        LocalMode.Controller lc = lma.getController();
        lc.runAsync();
        return lc;
    }

    private void chkOutput() throws Exception {
        File file = new File(outputFilePath);
        final int MAX = 60;
        for (int i = 0; i < MAX && (!file.exists()); ++i) {
            LOG.debug("Sleeping, i = {}", i);
            Thread.sleep(1000);
        }
        if (!file.exists()) {
            String msg = String.format("Error: %s not found after %d seconds%n", outputFilePath, MAX);
            throw new RuntimeException(msg);
        }
    }

    private void compare() throws Exception {
        // read output file
        File file = new File(outputFilePath);
        String output = FileUtils.readFileToString(file);
        Assert.assertArrayEquals(lines, output.split("\\n"));
    }
}