Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/txn/TimeoutCheckpointTrigger.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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0
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1 package org.dancres.blitz.txn; |
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2 |
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3 import java.util.logging.Level; |
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4 import java.io.IOException; |
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5 |
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6 import org.dancres.blitz.ActiveObjectRegistry; |
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7 |
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8 /** |
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9 */ |
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10 public class TimeoutCheckpointTrigger implements CheckpointTrigger, Runnable { |
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11 private Checkpointer theCheckpointer; |
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12 |
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13 private int theCommandThreshold; |
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14 |
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15 private Thread theCheckpointThread; |
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16 private boolean stopCheckpointing = false; |
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17 private int theLogCount = 0; |
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18 private long theTimeout; |
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19 |
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20 TimeoutCheckpointTrigger(Checkpointer aCheckpointer, |
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21 int aCommandThreshold, long aTimeout) { |
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22 theCheckpointer = aCheckpointer; |
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23 theCommandThreshold = aCommandThreshold; |
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24 theTimeout = aTimeout; |
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25 |
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26 ActiveObjectRegistry.add(this); |
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27 } |
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28 |
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29 public void loggedCommand() { |
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30 synchronized (this) { |
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31 ++theLogCount; |
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32 |
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33 if (theLogCount == theCommandThreshold) { |
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34 theLogCount = 0; |
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35 notify(); |
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36 } |
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37 } |
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38 } |
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39 |
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40 public void begin() { |
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41 theCheckpointThread = new Thread(this, "Checkpointer"); |
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42 theCheckpointThread.start(); |
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43 } |
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44 |
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45 public void halt() { |
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46 synchronized (this) { |
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47 stopCheckpointing = true; |
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48 notify(); |
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49 } |
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50 |
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51 try { |
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52 theCheckpointThread.join(); |
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53 theCheckpointThread = null; |
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54 } catch (InterruptedException anIE) { |
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55 TxnManager.theLogger.log(Level.SEVERE, |
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56 "Failed to wait for checkpointer", |
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57 anIE); |
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58 } |
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59 } |
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60 |
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61 public void run() { |
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62 boolean timeToExit = false; |
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63 |
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64 while (!timeToExit) { |
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65 synchronized (this) { |
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66 if (!stopCheckpointing) { |
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67 try { |
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68 wait(theTimeout); |
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69 } catch (InterruptedException anIE) { |
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70 TxnManager.theLogger.log(Level.INFO, |
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71 "Checkpointer interrupted", |
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72 anIE); |
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73 } |
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74 } |
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75 |
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76 timeToExit = stopCheckpointing; |
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77 theLogCount = 0; |
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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 } |