Mercurial > hg > blitz_stable
annotate src/org/prevayler/implementation/SnapshotterImpl.java @ 35:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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1 package org.prevayler.implementation; |
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2 |
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3 import java.io.File; |
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4 import java.io.FileOutputStream; |
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5 import java.io.ByteArrayOutputStream; |
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6 import java.io.ObjectOutputStream; |
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7 import java.io.IOException; |
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8 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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9 import org.prevayler.PrevalentSystem; |
3dc0c5604566
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Dan Creswell <dan.creswell@gmail.com>
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10 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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11 /** |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
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12 Represents a snapshot waiting to be persisted to disk. Invoke save() to |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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13 place the snapshot on disk - should only be called once all dirty state |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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14 (if any) has been flushed to disk. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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15 |
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16 @see org.dancres.blitz.txn.TxnManager |
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17 */ |
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18 class SnapshotterImpl implements Snapshotter { |
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19 private File theTemp; |
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20 private File theReal; |
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21 private byte[] theCachedCopy; |
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22 |
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23 private NumberFileCreator theFileCreator; |
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Dan Creswell <dan.creswell@gmail.com>
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24 |
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25 private boolean shouldClean; |
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Dan Creswell <dan.creswell@gmail.com>
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26 |
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27 SnapshotterImpl(NumberFileCreator aCreator, boolean doClean) |
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28 throws IOException { |
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29 |
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30 theTemp = aCreator.newTempSnapshot(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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31 theReal = aCreator.newSnapshot(); |
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Dan Creswell <dan.creswell@gmail.com>
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32 |
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33 theFileCreator = aCreator; |
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Dan Creswell <dan.creswell@gmail.com>
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34 shouldClean = doClean; |
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35 } |
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Dan Creswell <dan.creswell@gmail.com>
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36 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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37 void cacheSnapshot(PrevalentSystem aSystem) throws IOException { |
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Dan Creswell <dan.creswell@gmail.com>
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38 ByteArrayOutputStream myCache = new ByteArrayOutputStream(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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39 ObjectOutputStream mySnapper = new ObjectOutputStream(myCache); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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40 |
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41 mySnapper.writeObject(aSystem); |
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42 mySnapper.close(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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43 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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44 theCachedCopy = myCache.toByteArray(); |
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 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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47 public void save() throws IOException { |
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48 FileOutputStream myOutput = new FileOutputStream(theTemp); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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49 myOutput.write(theCachedCopy); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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50 myOutput.close(); |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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51 |
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52 if (!theTemp.renameTo(theReal)) |
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53 throw new IOException("Unable to rename " + theTemp + |
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54 " to " + theReal); |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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55 |
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56 if (shouldClean) |
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57 theFileCreator.newCleaner().clean(); |
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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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58 } |
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59 } |