Mercurial > hg > blitz_stable
annotate src/org/dancres/blitz/txn/OpCountingCheckpointTrigger.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.txn; |
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2 |
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3 import java.io.IOException; |
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4 |
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5 import java.util.logging.Level; |
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6 |
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7 import org.dancres.blitz.ActiveObjectRegistry; |
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8 |
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9 /** |
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10 A checkpoint trigger that fires off a checkpoint every time a certain |
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11 number of operations have been logged. |
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12 */ |
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13 class OpCountingCheckpointTrigger implements CheckpointTrigger, Runnable { |
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14 private Checkpointer theCheckpointer; |
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15 |
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16 private int theCommandThreshold; |
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17 |
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18 private Thread theCheckpointThread; |
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19 private boolean stopCheckpointing = false; |
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20 private int theLogCount = 0; |
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21 |
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22 OpCountingCheckpointTrigger(Checkpointer aCheckpointer, |
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23 int aCommandThreshold) { |
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24 theCheckpointer = aCheckpointer; |
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25 theCommandThreshold = aCommandThreshold; |
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26 |
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27 ActiveObjectRegistry.add(this); |
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28 } |
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29 |
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30 public void loggedCommand() { |
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31 synchronized(this) { |
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32 ++theLogCount; |
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33 |
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34 if (theLogCount == theCommandThreshold) { |
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35 theLogCount = 0; |
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36 notify(); |
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37 } |
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38 } |
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39 } |
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40 |
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41 public void begin() { |
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42 theCheckpointThread = new Thread(this, "Checkpointer"); |
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43 theCheckpointThread.start(); |
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44 } |
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45 |
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46 public void halt() { |
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47 synchronized(this) { |
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48 stopCheckpointing = true; |
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49 notify(); |
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50 } |
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51 |
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52 try { |
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53 theCheckpointThread.join(); |
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54 theCheckpointThread = null; |
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55 } catch (InterruptedException anIE) { |
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56 TxnManager.theLogger.log(Level.SEVERE, |
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57 "Failed to wait for checkpointer", |
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58 anIE); |
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59 } |
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60 } |
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61 |
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62 public void run() { |
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63 boolean timeToExit = false; |
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64 |
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65 while(!timeToExit) { |
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66 synchronized(this) { |
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67 if (!stopCheckpointing) { |
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68 try { |
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69 wait(); |
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70 } catch (InterruptedException anIE) { |
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71 TxnManager.theLogger.log(Level.INFO, |
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72 "Checkpointer interrupted", |
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73 anIE); |
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74 } |
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75 } |
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76 |
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77 timeToExit = stopCheckpointing; |
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78 } |
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79 |
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80 if (!timeToExit) { |
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81 try { |
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82 theCheckpointer.sync(); |
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83 } catch (IOException anIOE) { |
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84 TxnManager.theLogger.log(Level.SEVERE, |
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85 "Checkpoint failed", |
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86 anIOE); |
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87 } |
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88 } |
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89 } |
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90 } |
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91 |
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92 public boolean checkpointsDisabled() { |
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93 return false; |
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94 } |
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95 } |