PeriodicWork


1   package hudson.model;
2   
3   import java.util.TimerTask  ;
4   import java.util.logging.Level  ;
5   import java.util.logging.Logger  ;
6   
7   /**
8    * Abstract base class for a periodic work.
9    *
10   * @author Kohsuke Kawaguchi
11   */
12  public abstract class PeriodicWork extends TimerTask   {
13  
14      /**
15       * PluginName of the work.
16       */
17      private final String   name;
18      private Thread   thread;
19  
20      protected final Logger   logger = Logger.getLogger(getClass().getName());
21  
22      protected PeriodicWork(String   name) {
23          this.name = name;
24      }
25  
26      /**
27       * Schedules this periodic work now in a new thread, if one isn't already running.
28       */
29      public final void run() {
30          try {
31              if(thread!=null && thread.isAlive()) {
32                  logger.log(Level.INFO, name+" thread is still running. Execution aborted.");
33                  return;
34              }
35              thread = new Thread  (new Runnable  () {
36                  public void run() {
37                      logger.log(Level.INFO, "Started "+name);
38                      long startTime = System.currentTimeMillis();
39  
40                      execute();
41  
42                      logger.log(Level.INFO, "Finished "+name+". "+
43                          (System.currentTimeMillis()-startTime)+" ms");
44                  }
45              },name+" thread");
46              thread.start();
47          } catch (Throwable   t) {
48              logger.log(Level.SEVERE, name+" thread failed with error", t);
49          }
50      }
51  
52      protected abstract void execute();
53  }
54
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