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annotate src/org/dancres/blitz/remote/BlitzAdmin.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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1 package org.dancres.blitz.remote;
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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.rmi.Remote;
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6 import java.rmi.RemoteException;
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7
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8 import net.jini.core.transaction.TransactionException;
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9
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10 /**
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11 Blitz specific admin operations are available on this interface
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12 */
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13 public interface BlitzAdmin extends Remote {
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14 /**
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15 <p>Run a hot backup - whilst <code>requestSnapshot</code> requires one
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16 to suspend access to the Blitz instance and simply checkpoints to the
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17 database directory, this method can be used to produce a separate
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18 snapshot (in another directory) whilst activity continues. The output
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19 is suitable for restoration under circumstances of failure.</p>
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20
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21 <p>Note, an Entry's lease may expire before the backup is restored
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22 in which case it is deemed to have been remove from the space thus
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23 archives created with this method will only restore state that is
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24 not yet expired.</p>
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25
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26 <p>Note also that transactions active during the backup will
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27 <em>not</em> be reflected in the backup. This is a necessity as
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28 otherwise it would be impossible to finish the backup under some
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29 circumstances.</p>
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30
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31 <p>This method may supercede <code>requestSnapshot</code> some time
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32 in the future.</p>
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33
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34 <p><b>WARNING: Experimental at this stage</b></p>
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35
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36 @param aBackupDir is the directory in which to deposit the backup.
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37 Ensure that the directory is empty before invoking this method.
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38 Note that the directory will be created if it doesn't already exist.
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39 */
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40 public void backup(String aBackupDir) throws RemoteException, IOException;
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41
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42 /**
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43 <p>Blocks the caller, issues a checkpoint and returns on completion.
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44 Note, the caller should ensure that there's no current activity within
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45 the Blitz instance such as active transactions. If Blitz is active,
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46 the checkpoint will not contain *any* of the actions of these
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47 transactions. Prepared (but not commited or aborted) transactions are
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48 also problematic as they will be saved in the checkpoint but cannot,
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49 for example, be restored to another Blitz instance and commited there
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50 (unless you've used Activatable references in a suitable failover
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51 configuration).</p>
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52
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53 @throws IOException if the checkpoint failed.
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54 @throws TransactionException if there are active/prepared transactions
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55 which cannot be guarenteed to be recovered from the saved snapshot at
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56 restore time.
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57 */
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58 public void requestSnapshot() throws RemoteException,
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59 TransactionException, IOException;
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60
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61 /**
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62 Causes Blitz to shutdown cleanly whilst retaining state. This can
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63 also be achieved by calling DestroyAdmin::destroy() so long as the
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64 configuration variable <code>compatDestroy</code> is set to <code>
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65 false</code>.
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66 */
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67 public void shutdown() throws RemoteException, IOException;
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68
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69 /**
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70 Clean up all Entry's, abort outstanding matches etc so the JavaSpace
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71 is good as new.
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72 */
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73 public void clean() throws RemoteException, IOException;
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74
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75 /**
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76 Request a manual reap of lease expired Entry's. Note,
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77 <code>LeaseReaper.MANUAL_REAP</code> must be set for the relevant
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78 lease reap time variable in the configuration file.
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79 */
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80 public void reap() throws RemoteException;
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81 }