library/src/test/java/org/apache/apex/malhar/lib/io/PubSubWebSocketOperatorTest.java

/**
 * 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.io;

import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeoutException;

import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;
import org.junit.Assert;
import org.junit.Test;

import org.apache.apex.malhar.lib.utils.PubSubHelper;

import com.datatorrent.lib.helper.SamplePubSubWebSocketServlet;
import com.datatorrent.lib.testbench.CollectorTestSink;

/**
 * Tests for {@link com.datatorrent.lib.io.PubSubWebSocketOutputOperator}
 */
public class PubSubWebSocketOperatorTest
{

  @Test
  @SuppressWarnings("SleepWhileInLoop")
  public void testPubSubWebSocket() throws Exception
  {
    Server server = new Server(0);
    SamplePubSubWebSocketServlet servlet = new SamplePubSubWebSocketServlet();
    ServletHolder sh = new ServletHolder(servlet);
    ServletContextHandler contextHandler = new ServletContextHandler(server, "/", ServletContextHandler.SESSIONS);
    contextHandler.addServlet(sh, "/pubsub");
    contextHandler.addServlet(sh, "/*");
    server.start();
    Connector[] connector = server.getConnectors();
    URI uri = PubSubHelper.getURI("localhost:" + connector[0].getLocalPort());

    PubSubWebSocketOutputOperator<Object> outputOperator = new PubSubWebSocketOutputOperator<Object>();
    outputOperator.setUri(uri);
    outputOperator.setTopic("testTopic");

    PubSubWebSocketInputOperator<Object> inputOperator = new PubSubWebSocketInputOperator<Object>();
    inputOperator.setUri(uri);
    inputOperator.setTopic("testTopic");

    CollectorTestSink<Object> sink = new CollectorTestSink<Object>();
    inputOperator.outputPort.setSink(sink);

    inputOperator.setup(null);
    outputOperator.setup(null);

    inputOperator.activate(null);

    long timeout = System.currentTimeMillis() + 3000;
    while (!servlet.hasSubscriber()) {
      Thread.sleep(10);
      if (System.currentTimeMillis() > timeout) {
        throw new TimeoutException("No subscribers connected after 3 seconds");
      }
    }

    inputOperator.beginWindow(1000);
    outputOperator.beginWindow(1000);

    Map<String, String> data = new HashMap<String, String>();
    data.put("hello", "world");
    outputOperator.input.process(data);

    String stringData = "StringMessage";
    outputOperator.input.process(stringData);

    int timeoutMillis = 2000;
    while (sink.collectedTuples.size() < 2 && timeoutMillis > 0) {
      inputOperator.emitTuples();
      timeoutMillis -= 20;
      Thread.sleep(20);
    }

    outputOperator.endWindow();
    inputOperator.endWindow();

    Assert.assertTrue("tuples emitted", sink.collectedTuples.size() > 1);

    @SuppressWarnings("unchecked")
    Map<String, String> tuple = (Map<String, String>)sink.collectedTuples.get(0);
    Assert.assertEquals("Expects {\"hello\":\"world\"} as data", "world", tuple.get("hello"));

    String stringResult = (String)sink.collectedTuples.get(1);
    Assert.assertEquals("Expects {\"hello\":\"world\"} as data", stringData, stringResult);

    inputOperator.deactivate();

    outputOperator.teardown();
    inputOperator.teardown();

    server.stop();

  }

}