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1   /*
2    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
3    * The software in this package is published under the terms of the CPAL v1.0
4    * license, a copy of which has been included with this distribution in the
5    * LICENSE.txt file.
6    */
7   package org.mule.example.gpswalker;
8   
9   import org.mule.api.annotations.Schedule;
10  
11  import edu.emory.mathcs.backport.java.util.concurrent.atomic.AtomicBoolean;
12  
13  /**
14   * Generates a random walk around a city
15   */
16  public class CityStroller
17  {
18  
19      public static final GpsCoord SAN_FRANCISCO = new GpsCoord(37.789167f, -122.419281f);
20      public static final GpsCoord LONDON = new GpsCoord(37.788423f, -122.39823f);
21      public static final GpsCoord VALLETTA = new GpsCoord(35.898504f, 14.514313f);
22  
23  
24      private volatile GpsCoord currentCoord = SAN_FRANCISCO;
25      private AtomicBoolean firstTime = new AtomicBoolean(true);
26  
27      //could use a better algorithm here or real test data for better results
28      public GpsCoord generateNextCoord()
29      {
30          if (firstTime.get())
31          {
32              firstTime.set(false);
33          }
34          else
35          {
36              double dist = Math.random() * 0.002;
37              double angle = Math.random() * Math.PI;
38  
39  
40              float lat = currentCoord.getLatitude() + (float) (dist * Math.sin(angle));
41              float lng = currentCoord.getLongitude() + (float) (dist * Math.cos(angle));
42  
43              currentCoord = new GpsCoord(lat, lng);
44          }
45          return currentCoord;
46      }
47  
48      public GpsCoord getCurrentCoord()
49      {
50          return currentCoord;
51      }
52  
53      public void setCurrentCoord(GpsCoord currentCoord)
54      {
55          this.currentCoord = currentCoord;
56          firstTime.set(false);
57      }
58  }