examples/r/src/main/java/org/apache/apex/examples/r/oldfaithful/OldFaithfulApplication.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 org.apache.apex.examples.r.oldfaithful;

import java.util.HashMap;
import java.util.Map;

import org.apache.apex.malhar.lib.io.ConsoleOutputOperator;
import org.apache.hadoop.conf.Configuration;

import com.datatorrent.api.DAG;
import com.datatorrent.api.StreamingApplication;
import com.datatorrent.api.annotation.ApplicationAnnotation;

/**
 * The application attempts to simulate 'Old Faithful Geyser" eruption.
 * This application accepts readings for the waiting time and the subsequent eruption duration
 * of the 'Old Faithful' and based on this data, tries to predict the eruption duration of the next
 * eruption given the elapsed time since the last eruption.
 * The training data is generated for an application window and consists of multiple
 * waiting times and eruption duration values.
 * For every application window, it generates only one 'elapsed time' input for which the
 * prediction would be made.
 * Model in R is in file ruptionModel.R located at
 * examples/r/src/main/resources/com/datatorrent/examples/oldfaithful/ directory
 *
 * @since 2.1.0
 */

@ApplicationAnnotation(name = "OldFaithfulApplication")
public class OldFaithfulApplication implements StreamingApplication
{
  private final DAG.Locality locality = null;

  /**
   * Create the DAG
   */
  @Override
  public void populateDAG(DAG dag, Configuration conf)
  {

    InputGenerator randomInputGenerator = dag.addOperator("rand", new InputGenerator());
    FaithfulRScript rScriptOp = dag.addOperator("rScriptOp", new FaithfulRScript("com/datatorrent/examples/r/oldfaithful/eruptionModel.R", "eruptionModel", "retVal"));
    ConsoleOutputOperator consoles = dag.addOperator("consoles", new ConsoleOutputOperator());

    Map<String, FaithfulRScript.REXP_TYPE> argTypeMap = new HashMap<String, FaithfulRScript.REXP_TYPE>();

    argTypeMap.put("ELAPSEDTIME", FaithfulRScript.REXP_TYPE.REXP_INT);
    argTypeMap.put("ERUPTIONS", FaithfulRScript.REXP_TYPE.REXP_ARRAY_DOUBLE);
    argTypeMap.put("WAITING", FaithfulRScript.REXP_TYPE.REXP_ARRAY_INT);

    rScriptOp.setArgTypeMap(argTypeMap);

    dag.addStream("ingen_faithfulRscript", randomInputGenerator.outputPort, rScriptOp.faithfulInput).setLocality(locality);
    dag.addStream("ingen_faithfulRscript_eT", randomInputGenerator.elapsedTime, rScriptOp.inputElapsedTime).setLocality(locality);
    dag.addStream("faithfulRscript_console_s", rScriptOp.strOutput, consoles.input).setLocality(locality);

  }
}