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annotate src/org/dancres/blitz/notify/QueueEvent.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.
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1 package org.dancres.blitz.notify;
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2
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3 import org.dancres.blitz.txn.TxnState;
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4 import org.dancres.blitz.mangler.MangledEntry;
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5 import org.dancres.blitz.oid.OID;
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6
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7 /**
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8 <p>The event types break down into two classes - those that represent
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9 an invisible/visible transition and those that represent an
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10 unavailable/available transition. Here's a summary in table form:</p>
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11
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12 <table summary="Visibility and Availability Transitions" border="0" cellspacing="2" cellpadding="1">
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13 <tr align="center" valign="middle"><th></th><th>Invisible/Visible</th><th>Unavailable/Available</th>
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14 </tr>
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15 <tr align="center" valign="middle"><th>ENTRY_WRITE</th>
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16 <td>X</td>
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17 <td>X</td>
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18 </tr>
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19 <tr align="center" valign="middle"><th>ENTRY_WRITTEN</th>
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20 <td>X</td>
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21 <td>X</td>
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22 </tr>
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23 <tr align="center" valign="middle"><th>ENTRY_VISIBLE</th>
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24 <td>X</td>
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25 <td>X</td>
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26 </tr>
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27 <tr align="center" valign="middle"><th>ENTRY_NOT_CONFLICTED</th>
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28 <td>O</td>
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29 <td>X</td>
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30 </tr>
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31 </table>
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32
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33 @see org.dancres.blitz.notify.EventQueue
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34 */
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35 public class QueueEvent {
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36 /**
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37 Context object is null
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38 */
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39 public static final int TRANSACTION_ENDED = 1;
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40
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41 /**
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42 Context object is a MangledEntry plus OID -
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43 this event is triggered when a transaction initially writes a new Entry
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44 */
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45 public static final int ENTRY_WRITE = 2;
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46
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47 /**
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48 Context object is a MangledEntry plus OID -
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49 this event is triggered when a transaction commits a write.
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50 */
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51 public static final int ENTRY_WRITTEN = 3;
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52
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53 /**
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54 Context object is a MangledEntry plus OID - this event is triggered in
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55 the case where a take has been aborted and thus an Entry has been deemed
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56 visible again.
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57 */
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58 public static final int ENTRY_VISIBLE = 4;
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59
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60 /**
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61 Context object is a MangledEntry plus OID - this event is triggered in
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62 the case where an Entry was previously conflicted with a collection of
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63 read locks and has since been made available for a take again.
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64 Note, if the Entry was write locked, we don't generate this event
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65 as it'll result from the ENTRY_WRITTEN event. Note also we don't
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66 generate this event if the Entry is marked as taken/deleted (obviously)
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67 */
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68 public static final int ENTRY_NOT_CONFLICTED = 5;
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69
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70 private int theType;
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71 private TxnState theTxn;
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72 private Context theContext;
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73
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74 public QueueEvent(int aType, TxnState aTxn, Context aContext) {
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75 theType = aType;
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76 theTxn = aTxn;
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77 theContext = aContext;
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78 }
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79
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80 public int getType() {
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81 return theType;
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82 }
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83
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84 public TxnState getTxn() {
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85 return theTxn;
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86 }
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87
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88 public Context getContext() {
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89 return theContext;
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90 }
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91
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92 public static class Context {
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93 private MangledEntry _entry;
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94 private OID _oid;
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95
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96 public Context(MangledEntry anEntry, OID anOID) {
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97 _oid = anOID;
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98 _entry = anEntry;
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99 }
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100
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101 public MangledEntry getEntry() {
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102 return _entry;
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103 }
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104
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105 public OID getOID() {
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106 return _oid;
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107 }
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108 }
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109 }