Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/disk/RetryingUpdate.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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1 package org.dancres.blitz.disk;
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2
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3 import java.io.IOException;
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4
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5 import java.util.logging.Logger;
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6 import java.util.logging.Level;
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7
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8 import com.sleepycat.je.DatabaseException;
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9 import com.sleepycat.je.DeadlockException;
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10 import com.sleepycat.je.LockNotGrantedException;
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11
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12 import org.dancres.blitz.Logging;
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13
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14 public class RetryingUpdate {
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15 static Logger theLogger =
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16 Logging.newLogger("org.dancres.blitz.disk.RetryingUpdate");
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17
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18 private RetryableOperation theOp;
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19
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20 public RetryingUpdate(RetryableOperation anOp) {
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21 theOp = anOp;
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22 }
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23
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24 public Object commit() throws IOException {
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25 int myRetryCount = 0;
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26
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27 do {
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28 DiskTxn myTxn = DiskTxn.newNonBlockingStandalone();
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29
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30 try {
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31 Object myResult = theOp.perform(myTxn);
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32
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33 myTxn.commit();
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34
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35 if (myRetryCount != 0) {
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36 if (theLogger.isLoggable(Level.FINE))
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37 theLogger.log(Level.FINE,
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38 "Total retries: " + myRetryCount);
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39 }
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40
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41 return myResult;
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42 } catch (DatabaseException aDbe) {
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43 if ((aDbe instanceof DeadlockException) ||
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44 (aDbe instanceof LockNotGrantedException)) {
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45
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46 if (theLogger.isLoggable(Level.FINEST))
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47 theLogger.log(Level.FINEST, "Got lock exception", aDbe);
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48
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49 myTxn.abort();
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50
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51
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52 // System.err.println("Aborting" + theOp + " retry: " +
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53 // myRetryCount);
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54
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55 ++myRetryCount;
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56
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57 BackoffGenerator.pause();
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58
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59 } else {
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60 theLogger.log(Level.SEVERE, "Got Dbe", aDbe);
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61 throw new IOException("Dbe");
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62 }
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63 }
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64 } while (true);
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65 }
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66 }