Mercurial > hg > blitz_condensed
comparison src/org/dancres/blitz/txn/AbortCommand.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.Serializable; | |
4 | |
5 import java.util.logging.Level; | |
6 | |
7 import net.jini.core.transaction.UnknownTransactionException; | |
8 | |
9 import org.prevayler.Command; | |
10 import org.prevayler.PrevalentSystem; | |
11 | |
12 /** | |
13 Command to issue abort against transaction held in TxnManagerState | |
14 */ | |
15 class AbortCommand implements Command { | |
16 static final long serialVersionUID = 182858469530698187L; | |
17 | |
18 private TxnId theId; | |
19 | |
20 AbortCommand(TxnId anId) { | |
21 theId = anId; | |
22 } | |
23 | |
24 public Serializable execute(PrevalentSystem aSystem) throws Exception { | |
25 TxnManagerState mySystem = (TxnManagerState) aSystem; | |
26 | |
27 try { | |
28 mySystem.abort(theId); | |
29 } catch (UnknownTransactionException aUTE) { | |
30 /* | |
31 We may have logged the abort command whilst the transaction was | |
32 in active state which means there's no prior prepare command in | |
33 the log. If we then run recovery, the first time we'll do | |
34 anything with the transaction is when we load and execute abort. | |
35 Because there's no prior prepare, we will have no state loaded | |
36 for the transaction. Thus, if we can't find the transaction it's | |
37 okay but we shouldn't take further action. | |
38 | |
39 Of course, we could be asked to abort something we're | |
40 unaware of which can happen under various circumstances | |
41 (including a buggy TxnMgr) but it's okay to swallow that silently. | |
42 */ | |
43 TxnManager.theLogger.log(Level.FINE, | |
44 "Abort failed - transaction is missing", | |
45 aUTE); | |
46 } | |
47 | |
48 return null; | |
49 } | |
50 | |
51 public String toString() { | |
52 return " AB : " + theId; | |
53 } | |
54 } |