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annotate src/org/dancres/blitz/txn/AbortCommand.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
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3dc0c5604566 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.Serializable;
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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 net.jini.core.transaction.UnknownTransactionException;
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8
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9 import org.prevayler.Command;
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10 import org.prevayler.PrevalentSystem;
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11
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12 /**
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13 Command to issue abort against transaction held in TxnManagerState
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14 */
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15 class AbortCommand implements Command {
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16 static final long serialVersionUID = 182858469530698187L;
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17
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18 private TxnId theId;
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19
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20 AbortCommand(TxnId anId) {
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21 theId = anId;
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22 }
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23
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24 public Serializable execute(PrevalentSystem aSystem) throws Exception {
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25 TxnManagerState mySystem = (TxnManagerState) aSystem;
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26
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27 try {
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28 mySystem.abort(theId);
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29 } catch (UnknownTransactionException aUTE) {
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30 /*
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31 We may have logged the abort command whilst the transaction was
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32 in active state which means there's no prior prepare command in
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33 the log. If we then run recovery, the first time we'll do
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34 anything with the transaction is when we load and execute abort.
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35 Because there's no prior prepare, we will have no state loaded
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36 for the transaction. Thus, if we can't find the transaction it's
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37 okay but we shouldn't take further action.
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38
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39 Of course, we could be asked to abort something we're
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40 unaware of which can happen under various circumstances
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41 (including a buggy TxnMgr) but it's okay to swallow that silently.
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42 */
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43 TxnManager.theLogger.log(Level.FINE,
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44 "Abort failed - transaction is missing",
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45 aUTE);
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46 }
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47
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48 return null;
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49 }
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50
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51 public String toString() {
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52 return " AB : " + theId;
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53 }
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54 }