Interruptable


1   /*
2    This software is OSI Certified Open Source Software.
3   OSI Certified is a certification mark of the Open Source Initiative.
4   
5   The license (Mozilla version 1.0) can be read at the MMBase site.
6   See http://www.MMBase.org/license
7    */
8   package org.mmbase.applications.crontab;
9   import java.util.*;
10  
11  import org.mmbase.util.logging.*;
12  
13  /**
14   * A Runnable wich also has an 'interrupt' method. This only works well
15   * if the job does sleeps (InterruptedException) or check Thread.isInterrupted().
16   * @author Michiel Meeuwissen
17   * @since MMBase-1.8
18   */
19  
20  public class Interruptable implements Runnable   {
21      private static final Logger log = Logging.getLoggerInstance(Interruptable.class);
22      private Thread   runThread = null;
23      private Date   startTime;
24      private final Runnable   runnable;
25      private final Collection collection;
26      public Interruptable(Runnable   run, Collection col) {
27          runnable = run;
28          collection = col;
29      }
30  
31      public void run() {
32          if (runThread != null) throw new IllegalStateException  ();
33          if (collection != null) collection.add(this);
34          runThread = Thread.currentThread();
35          startTime = new Date();
36          try {
37              runnable.run();
38          } catch (Throwable   t) {
39              log.error(t.getMessage(), t);
40          }
41  
42  
43          runThread = null;
44          if (collection != null) collection.remove(this);
45      }
46  
47      public boolean interrupt() {
48          Thread   t = runThread;
49          if (t != null) {
50              t.interrupt();
51              return true;
52          }
53          return false;
54      }
55      public boolean isAlive() {
56          Thread   t = runThread;
57          return t != null && t.isAlive();
58      }
59      public Date getStartTime() {
60          return startTime;
61      }
62  }
63
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