Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/disk/RetryingUpdate.java @ 33:0b9265358617
Added tag 2.1.1 for changeset a77f0a9ed93c
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:52:10 +0100 |
parents | 3dc0c5604566 |
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0
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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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Dan Creswell <dan.creswell@gmail.com>
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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 } |