Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/notify/EventGenerator.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 net.jini.space.JavaSpace; |
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4 |
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5 import org.dancres.blitz.txn.TxnId; |
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6 |
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7 import org.dancres.blitz.mangler.MangledEntry; |
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8 |
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9 import org.dancres.blitz.oid.OID; |
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10 |
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11 /** |
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12 <p> Represents a single registration via notify. If it's transactional, |
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13 it will never be saved as it's considered temporary. If it's transactional |
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14 it will be saved to disk. In addition, it's state will be saved to the |
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15 log periodically (on a number of allocations basis) to preserve data |
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16 in case of a crash. <p> |
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17 |
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18 <p> This class uses notifyPreparer to do initial preparation of the |
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19 passed RemoteEventListener when constructed from scratch (i.e. it's a new |
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20 registration). It uses recoveredNotifyPreparer in those cases where it |
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21 has been de-serialized from storage and is about to be used for the first |
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22 time post a restart </p> |
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23 |
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24 <p> Instances of this object can be "tainted" for various reasons including |
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25 certain kinds of exception from the remote notify implementation, lease |
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26 expiry or transaction commit. Tainting prevents any further operations |
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27 against this instance such as event dispatch, logging changes to disk and |
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28 lease renewal. Tainting also results in cleanup for the registration being |
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29 scheduled.</p> |
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30 */ |
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31 public interface EventGenerator { |
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32 public void assign(OID anOID); |
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33 |
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34 public long getStartSeqNum(); |
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35 |
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36 public OID getId(); |
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37 |
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38 public boolean isPersistent(); |
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39 |
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40 public long getSourceId(); |
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41 |
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42 /** |
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43 Once an EventGenerator becomes tainted it will generate no more events |
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44 and schedule cleanup. |
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45 */ |
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46 public void taint(); |
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47 |
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48 /* ******************************************************************** |
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49 Event filtering starts here |
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50 **********************************************************************/ |
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51 |
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52 /** |
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53 Determines whether the passed QueueEvent is "visible" to this |
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54 EventGenerator. This is determind by checking transaction id's, expiry |
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55 and that the generator isn't "tainted" |
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56 */ |
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57 public boolean canSee(QueueEvent anEvent, long aTime); |
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58 |
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59 /** |
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60 * @return a handback to use in the send event or null indicating no match |
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61 */ |
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62 public boolean matches(MangledEntry anEntry); |
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63 |
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64 /* ******************************************************************** |
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65 Lease management starts here |
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66 **********************************************************************/ |
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67 |
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68 public boolean renew(long aTime); |
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69 |
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70 /* ******************************************************************** |
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71 Recovery starts here |
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72 **********************************************************************/ |
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73 |
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74 public void recover(long aSeqNum); |
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75 |
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76 /** |
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77 Jumps the sequence number by the RESTART_JUMP |
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78 */ |
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79 public long jumpSequenceNumber(); |
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80 |
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81 /** |
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82 Jumps the sequence number if it's not already at this minimum. |
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83 */ |
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84 public long jumpSequenceNumber(long aMin); |
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85 |
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86 |
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87 /* ******************************************************************** |
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88 Event Generation starts here |
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89 **********************************************************************/ |
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90 |
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91 /** |
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92 Dispatches a remote event to a client using the passed source. |
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93 */ |
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94 public void ping(QueueEvent anEvent, JavaSpace aSource); |
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95 |
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96 /* ******************************************************************** |
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97 State save/recovery starts here |
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98 **********************************************************************/ |
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99 |
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100 public EventGeneratorState getMemento(); |
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101 } |