ThreadTest


1   /*****************************************************************************
2   
3   JEP - Java Math Expression Parser 2.3.0
4         October 3 2004
5         (c) Copyright 2004, Nathan Funk and Richard Morris
6         See LICENSE.txt for license information.
7   
8   *****************************************************************************/
9   
10  package org.nfunk.jepexamples;
11  
12  /**
13   * This class tests the thread safety of the JEP package. 1000 threads
14   * are started, and each one invokes the evaluate method. The evaluate method
15   * creates 10 JEP instances.
16   * <p>
17   * Thanks to Matthew Baird and Daniel Teng for this code.
18   */
19  public class ThreadTest {
20      
21      static long time = 0;
22      
23      /**
24       * Start 1000 threads.
25       */
26      public static void main(String  [] args) {
27          ThreadTest test = new ThreadTest();
28          
29          for (int i = 0; i < 1000; i++) {
30              ThreadTestThread t = new ThreadTestThread(test);
31              t.start();
32          }
33      }
34      
35      public ThreadTest() {
36      }
37  
38      /**
39       * Perform a simple evaluation using a new JEP instance. This method
40       * is called by all ThreadTestThreads at very much the same time.
41       */
42      public void evaluate() {
43          for (int i = 0; i < 10; i++) {
44              org.nfunk.jep.JEP myParser = new org.nfunk.jep.JEP();
45              String   fooValue = null;
46              Math.random();
47  
48              if (Math.random()> 0.5) {
49                  fooValue="NLS";
50              } else {
51                  fooValue="NLT";
52              }
53  
54              myParser.addVariable("foo",fooValue);
55              myParser.parseExpression("foo==\""+fooValue + "\"");
56  
57              if (myParser.getValue() < 1.0)
58                  System.out.println("ERROR");
59          }
60      }
61  }
62
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