SparkKMeansAppTest.java

/*
 * Copyright © 2014 Cask Data, Inc.
 *
 * Licensed 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 $package;

import co.cask.cdap.api.metrics.RuntimeMetrics;
import co.cask.cdap.test.ApplicationManager;
import co.cask.cdap.test.FlowManager;
import co.cask.cdap.test.ServiceManager;
import co.cask.cdap.test.SparkManager;
import co.cask.cdap.test.StreamManager;
import co.cask.cdap.test.TestBase;
import co.cask.cdap.test.TestConfiguration;
import com.google.common.base.Charsets;
import com.google.common.io.ByteStreams;
import org.junit.Assert;
import org.junit.ClassRule;
import org.junit.Test;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.concurrent.TimeUnit;

/**
 * SparkKMeansApp main tests.
 */
public class SparkKMeansAppTest extends TestBase {

  @ClassRule
  public static final TestConfiguration CONFIG = new TestConfiguration("explore.enabled", false);

  @Test
  public void test() throws Exception {
    // Deploy the Application
    ApplicationManager appManager = deployApplication(SparkKMeansApp.class);
    // Start the Flow
    FlowManager flowManager = appManager.getFlowManager("PointsFlow").start();
    // Send a few points to the stream
    StreamManager streamManager = getStreamManager("pointsStream");
    streamManager.send("10.6 519.2 110.3");
    streamManager.send("10.6 518.1 110.1");
    streamManager.send("10.6 519.6 109.9");
    streamManager.send("10.6 517.9 108.9");
    streamManager.send("10.7 518 109.2");

    //  Wait for the events to be processed, or at most 5 seconds
    RuntimeMetrics metrics = flowManager.getFlowletMetrics("reader");
    metrics.waitForProcessed(3, 5, TimeUnit.SECONDS);

    // Start a Spark Program
    SparkManager sparkManager = appManager.getSparkManager("SparkKMeansProgram").start();
    sparkManager.waitForFinish(60, TimeUnit.SECONDS);

    flowManager.stop();

    // Start CentersService
    ServiceManager serviceManager = appManager.getServiceManager(SparkKMeansApp.CentersService.SERVICE_NAME).start();

    // Wait service startup
    serviceManager.waitForStatus(true);

    // Request data and verify it
    String response = requestService(new URL(serviceManager.getServiceURL(15, TimeUnit.SECONDS), "centers/1"));
    String[] coordinates = response.split(",");
    Assert.assertTrue(coordinates.length == 3);
    for (String coordinate : coordinates) {
      double value = Double.parseDouble(coordinate);
      Assert.assertTrue(value > 0);
    }

    // Request data by incorrect index and verify response
    URL url = new URL(serviceManager.getServiceURL(15, TimeUnit.SECONDS), "centers/10");
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    try {
      Assert.assertEquals(HttpURLConnection.HTTP_NO_CONTENT, conn.getResponseCode());
    } finally {
      conn.disconnect();
    }
  }

  private String requestService(URL url) throws IOException {
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    Assert.assertEquals(HttpURLConnection.HTTP_OK, conn.getResponseCode());
    try {
      return new String(ByteStreams.toByteArray(conn.getInputStream()), Charsets.UTF_8);
    } finally {
      conn.disconnect();
    }
  }
}