Mercurial > hg > blitz_condensed
annotate src/org/dancres/blitz/notify/QueueEvent.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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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 } |