Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/disk/SyncFinalizer.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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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 }