Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/notify/SeqNumInterval.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
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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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14 |
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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 |
3dc0c5604566
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Dan Creswell <dan.creswell@gmail.com>
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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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Initial checkin of blitz 2.0 fcs - no installer yet.
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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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Initial checkin of blitz 2.0 fcs - no installer yet.
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23 EventGenerator sequence number up-to-date. Note that in the case of |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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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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Initial checkin of blitz 2.0 fcs - no installer yet.
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35 theSeqNum = aSeqNum; |
3dc0c5604566
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Dan Creswell <dan.creswell@gmail.com>
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36 } |
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Dan Creswell <dan.creswell@gmail.com>
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37 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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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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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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40 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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41 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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42 public void abort(TxnState aState) throws IOException { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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43 // Nothing to do, we're just recording state |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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44 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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45 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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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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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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48 theOID + ", " + theSeqNum); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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49 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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50 EventGeneratorFactory.get().recover(theOID, theSeqNum); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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51 } |
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Dan Creswell <dan.creswell@gmail.com>
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52 |
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53 public String toString() { |
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54 return " SN : " + theOID + " : " + theSeqNum; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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55 } |
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56 } |