Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/notify/SeqNumInterval.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +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.notify;
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2
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3 import java.io.IOException;
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4 import java.io.Serializable;
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5
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6 import java.util.logging.Level;
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7
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8 import org.dancres.blitz.txn.TxnState;
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9 import org.dancres.blitz.txn.TxnOp;
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10
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11 import org.dancres.blitz.disk.DiskTxn;
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12
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13 import org.dancres.blitz.oid.OID;
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15 import org.dancres.blitz.meta.RegistryFactory;
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16 import org.dancres.blitz.meta.Registry;
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17
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18 /**
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19 Log action which restores a snapshotted sequence number to an event
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20 generator. Rather than save an update to disk for each event we generate,
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21 we log a single change record after a fixed number of events have been
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22 dispatched. In this way, we reduce I/O's and can still keep the
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23 EventGenerator sequence number up-to-date. Note that in the case of
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24 restore from log, a <code>RemoteEventListener</code> will likely see a
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25 slightly bigger jump than it might expect - that's okay. Note also that
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26 such restarts will "eat up" a few sequence numbers (i.e. they will never
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27 be used on a RemoteEvent) - that's okay too.
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28 */
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29 class SeqNumInterval implements TxnOp {
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30 private OID theOID;
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31 private long theSeqNum;
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32
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33 SeqNumInterval(OID aOID, long aSeqNum) {
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34 theOID = aOID;
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35 theSeqNum = aSeqNum;
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36 }
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37
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38 public void commit(TxnState aState) throws IOException {
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39 // Nothing to do, we're just recording state
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40 }
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41
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42 public void abort(TxnState aState) throws IOException {
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43 // Nothing to do, we're just recording state
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44 }
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45
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46 public void restore(TxnState aState) throws IOException {
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47 EventQueue.theLogger.log(Level.FINE, "Patching notify reg" +
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48 theOID + ", " + theSeqNum);
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49
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50 EventGeneratorFactory.get().recover(theOID, theSeqNum);
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51 }
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52
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53 public String toString() {
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54 return " SN : " + theOID + " : " + theSeqNum;
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55 }
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56 }