Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/disk/SyncFinalizer.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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1 package org.dancres.blitz.disk; |
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2 |
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3 import java.util.logging.Level; |
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4 |
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5 import com.sleepycat.je.Environment; |
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6 import com.sleepycat.je.DatabaseException; |
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7 import com.sleepycat.je.CheckpointConfig; |
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8 |
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9 import org.dancres.blitz.task.Task; |
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10 |
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11 /** |
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12 <p>We pass one of these to the WriteDaemon which calls back on it once |
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13 it has "forced" all write requests lodged before the call to force. This |
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14 ensures we checkpoint Db having flushed the relevant updates.</p> |
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15 |
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16 <p>Optionally, the SyncFinalizer can callback a user-defined |
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17 task to perform additional work post sync. If this mechanism is used, the |
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18 thread which calls <code>waitForCompletion()</code> will not be blocked |
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19 because all work will be done asynchronously. Otherwise, the calling thread |
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20 is blocked until completion.</p> |
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21 */ |
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22 class SyncFinalizer implements Task { |
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23 private boolean isDone = false; |
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24 private Runnable theCompletionTask; |
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25 private Environment theEnv; |
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26 |
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27 SyncFinalizer(Environment anEnv, Runnable aCompletionTask) { |
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28 theEnv = anEnv; |
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29 theCompletionTask = aCompletionTask; |
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30 } |
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31 |
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32 public void run() { |
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33 try { |
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34 theEnv.sync(); |
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35 |
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36 CheckpointConfig myConfig = new CheckpointConfig(); |
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37 myConfig.setForce(true); |
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38 theEnv.checkpoint(myConfig); |
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39 |
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40 } catch (DatabaseException aDbe) { |
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41 WriteDaemon.theLogger.log(Level.SEVERE, |
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42 "Warning, failed to checkpoint", aDbe); |
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43 } |
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44 |
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45 if (theCompletionTask != null) |
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46 theCompletionTask.run(); |
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47 else |
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48 synchronized(this) { |
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49 isDone = true; |
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50 notify(); |
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51 } |
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52 } |
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53 |
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54 /** |
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55 Only blocks when there's no completion task. i.e. The completion task |
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56 is assumed to imply that the caller requires asynchronous completion |
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57 and does not wish to block. |
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58 */ |
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59 void waitForCompletion() { |
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60 // No completion task means block. |
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61 // |
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62 if (theCompletionTask == null) { |
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63 long myStart = System.currentTimeMillis(); |
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64 |
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65 synchronized(this) { |
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66 while (!isDone) { |
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67 try { |
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68 wait(); |
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69 } catch (InterruptedException anIE) { |
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70 } |
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71 } |
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72 } |
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73 |
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74 long myEnd = System.currentTimeMillis(); |
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75 WriteDaemon.theLogger.log(Level.FINE, |
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76 "Queue blocked for: " + |
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77 (myEnd - myStart)); |
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78 } |
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79 } |
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80 } |