Mercurial > hg > blitz_stable
comparison 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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-1:000000000000 | 0:3dc0c5604566 |
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1 package org.dancres.blitz.txn; | |
2 | |
3 import java.io.IOException; | |
4 | |
5 import java.util.logging.Level; | |
6 | |
7 import org.dancres.blitz.ActiveObjectRegistry; | |
8 | |
9 /** | |
10 A checkpoint trigger that fires off a checkpoint every time a certain | |
11 number of operations have been logged. | |
12 */ | |
13 class OpCountingCheckpointTrigger implements CheckpointTrigger, Runnable { | |
14 private Checkpointer theCheckpointer; | |
15 | |
16 private int theCommandThreshold; | |
17 | |
18 private Thread theCheckpointThread; | |
19 private boolean stopCheckpointing = false; | |
20 private int theLogCount = 0; | |
21 | |
22 OpCountingCheckpointTrigger(Checkpointer aCheckpointer, | |
23 int aCommandThreshold) { | |
24 theCheckpointer = aCheckpointer; | |
25 theCommandThreshold = aCommandThreshold; | |
26 | |
27 ActiveObjectRegistry.add(this); | |
28 } | |
29 | |
30 public void loggedCommand() { | |
31 synchronized(this) { | |
32 ++theLogCount; | |
33 | |
34 if (theLogCount == theCommandThreshold) { | |
35 theLogCount = 0; | |
36 notify(); | |
37 } | |
38 } | |
39 } | |
40 | |
41 public void begin() { | |
42 theCheckpointThread = new Thread(this, "Checkpointer"); | |
43 theCheckpointThread.start(); | |
44 } | |
45 | |
46 public void halt() { | |
47 synchronized(this) { | |
48 stopCheckpointing = true; | |
49 notify(); | |
50 } | |
51 | |
52 try { | |
53 theCheckpointThread.join(); | |
54 theCheckpointThread = null; | |
55 } catch (InterruptedException anIE) { | |
56 TxnManager.theLogger.log(Level.SEVERE, | |
57 "Failed to wait for checkpointer", | |
58 anIE); | |
59 } | |
60 } | |
61 | |
62 public void run() { | |
63 boolean timeToExit = false; | |
64 | |
65 while(!timeToExit) { | |
66 synchronized(this) { | |
67 if (!stopCheckpointing) { | |
68 try { | |
69 wait(); | |
70 } catch (InterruptedException anIE) { | |
71 TxnManager.theLogger.log(Level.INFO, | |
72 "Checkpointer interrupted", | |
73 anIE); | |
74 } | |
75 } | |
76 | |
77 timeToExit = stopCheckpointing; | |
78 } | |
79 | |
80 if (!timeToExit) { | |
81 try { | |
82 theCheckpointer.sync(); | |
83 } catch (IOException anIOE) { | |
84 TxnManager.theLogger.log(Level.SEVERE, | |
85 "Checkpoint failed", | |
86 anIOE); | |
87 } | |
88 } | |
89 } | |
90 } | |
91 | |
92 public boolean checkpointsDisabled() { | |
93 return false; | |
94 } | |
95 } |