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annotate src/org/dancres/blitz/txn/OpCountingCheckpointTrigger.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.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 }