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Metaclass Framework Reference 4-5
sommBeforeMethod Method
Purpose
Specifies a method that is automatically called before execution of each client method.
IDL Syntax
boolean sommBeforeMethod (
in SOMObject object,
in somId methodID,
in va_list ap);
Description
The sommBeforeMethod specifies a method that is automatically called before execution
of each client method. The sommBeforeMethod method is not called directly by the user.
To define the desired “before” method, sommBeforeMethod must be overridden in a
metaclass that is a subclass (child) of SOMMBeforeAfter. The default implementation does
nothing until it is overridden.
Warning: somDefaultInit is among the methods that get before/after behavior, which
implies that the following obligation is imposed on the programmer of a
sommBeforeMethod. Specifically, care must be taken to guard against
sommBeforeMethod being called before the somDefaultInit method has executed and the
object is not yet fully initialized.
Parameters
Refer to the diagram in the following section for further clarification of these arguments.
receiver A pointer to an object (class) of metaclass SOMMBeforeAfter representing
the class object that supports the method (such as, “myMethod”) for which
the “before” method will apply.
ev A pointer where the method can return exception information if an error is
encountered. The dispatch method of SOMMBeforeAfter sets this
parameter to NULL before dispatching the first sommBeforeMethod.
object A pointer to the instance of the receiver on which the method is invoked.
methodId The SOM ID of the method (such as, “myMethod”) that was invoked.
ap The list of input arguments to the method (“myMethod”).
Return Value
A boolean that indicates whether or not before/after dispatching should continue. If the
value is TRUE, normal before/after dispatching continues. If the value is FALSE, the
dispatching skips to the sommAfterMethod associated with the preceding
sommBeforeMethod. This implies that the sommBeforeMethod must do any
post-processing that might otherwise be done by the sommAfterMethod. Because
before/after methods are paired within a SOMMBeforeAfter metaclass, this design
eliminates the complexity of communicating to the sommAfterMethod that the
sommBeforeMethod returned FALSE.
- Bull DPX/20 1
- About This Book 5
- Contents 7
- SOM Kernel Reference 1-1 13
- C++ Example 15
- SOM Kernel Reference 1-5 17
- SOM Kernel Reference 1-9 21
- ++ language bindings 22
- SOM Kernel Reference 1-13 25
- SOM Kernel Reference 1-15 27
- SOM Kernel Reference 1-17 29
- SOM Kernel Reference 1-19 31
- SOM Kernel Reference 1-25 37
- SOM Kernel Reference 1-27 39
- ++ usage bindings use this 42
- ++ usage 42
- SOM Kernel Reference 1-33 45
- SOM Kernel Reference 1-35 47
- SOM Kernel Reference 1-37 49
- SOMCalloc Function 51
- SOMClassInitFuncName Function 52
- SOMDeleteModule Function 53
- SOMError Function 54
- SOMFree Function 55
- SOMInitModule Function 56
- SOMLoadModule Function 58
- SOMMalloc Function 59
- SOMOutCharRoutine Function 60
- SOMRealloc Function 61
- SOM_Assert Macro 62
- SOM_ClassLibrary Macro 63
- SOM Kernel Reference 1-53 65
- SOM_Error Macro 66
- SOM_Expect Macro 67
- SOM_GetClass Macro 68
- SOM_InitEnvironment Macro 69
- SOM_MainProgram Macro 70
- SOM_NoTrace Macro 71
- SOM_ParentNumResolve Macro 72
- SOM_Resolve Macro 73
- SOM_ResolveNoCheck Macro 74
- SOM_SubstituteClass Macro 75
- SOM_Test Macro 76
- SOM_TestC Macro 77
- SOM_UninitEnvironment Macro 78
- SOM_WarnMsg Macro 79
- SOMClass Class 80
- Introduced Methods 81
- Deprecated Methods 82
- SOM Kernel Reference 1-71 83
- SOM Kernel Reference 1-75 87
- SOM Kernel Reference 1-79 91
- SOM Kernel Reference 1-83 95
- SOM Kernel Reference 1-85 97
- SOM Kernel Reference 1-87 99
- SOM Kernel Reference 1-89 101
- NULL is returned 101
- SOM Kernel Reference 1-91 103
- SOM Kernel Reference 1-93 105
- SOM Kernel Reference 1-95 107
- SOM Kernel Reference 1-97 109
- SOM Kernel Reference 1-99 111
- Related Information 112
- Original Class 112
- SOM Kernel Reference 1-101 113
- IDL Syntax 114
- Description 114
- Parameters 114
- Return Value 114
- SOMClassMgr Class 117
- New Methods 118
- Overridden Methods 118
- SOM Kernel Reference 1-107 119
- Return Values 120
- C Example 121
- SOM Kernel Reference 1-117 129
- SOM Kernel Reference 1-123 135
- SOMObject Class 138
- SOM Kernel Reference 1-139 151
- SOM Kernel Reference 1-143 155
- SOM Kernel Reference 1-145 157
- SOM Kernel Reference 1-153 165
- DSOM Framework Reference 169
- DSOM and CORBA 170
- ORBfree Function 172
- C Syntax 173
- SOMD_Init Function 176
- SOMD_NoORBfree Function 177
- SOMD_Uninit Function 180
- Context_delete Macro 181
- Request_delete Macro 182
- BOA Class 184
- Context Class 196
- ImplementationDef Class 204
- ImplRepository Class 206
- NVList Class 218
- ObjectMgr Class 229
- ORB Class 235
- Principal Class 241
- Request Class 242
- SOMDClientProxy Class 253
- Overridden methods 254
- SOMDObject Class 263
- SOMDObjectMgr Class 276
- SOMDServer Class 281
- SOMDServerMgr Class 289
- _ServerDisabled or 293
- SOMOA Class 297
- _NoMessages is returned as 304
- AttributeDef Class 308
- Overriding Methods 309
- ConstantDef Class 310
- Contained Class 312
- Container Class 318
- ExceptionDef Class 325
- InterfaceDef Class 327
- Attributes 328
- ModuleDef Class 331
- OperationDef Class 332
- ParameterDef Class 334
- Repository Class 336
- TypeDef Class 342
- TypeCode_alignment Function 343
- TypeCode_copy Function 344
- TypeCode_equal Function 345
- TypeCode_free Function 346
- TypeCode_kind Function 347
- TypeCodeNew Function 350
- TypeCode_param_count Function 352
- TypeCode_parameter Function 353
- TypeCode_print Function 355
- TypeCode_size Function 357
- SOMMBeforeAfter Metaclass 360
- SOMMSingleInstance Metaclass 365
- ++, or the somNew method 366
- SOMMTraced Metaclass 367
- SOMEClientEvent Class 370
- SOMEEMan Class 375
- SOMEEMRegisterData Class 391
- SOMEEvent Class 399
- SOMESinkEvent Class 404
- SOMETimerEvent Class 407
- SOMEWorkProcEvent Class 410
- NOM / NAME : Date : 419
- SOCIETE / COMPANY : 419
- ADRESSE / ADDRESS : 419
- 86 A2 28AQ 01 422
- ORDER REFERENCE 422
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Index 341
21
Packages
47
Software
61
Item Description
100
Quorum/Witness
128
Scenario 1
134
Scenario 2
134
Scenario 3
134
Scenario 4
135
<vm_id>
139
Watchdog
140
Configuration
141
Meta Policies
144
Listing Policies
146
Setting Policies
146
LifeKeeper API
148
N-Way Recovery
149
File Menu
172
View Menu
173
Help Menu
174
Toolbars
174
GUI Toolbar
174
GUI Server
179
GUI Client
179
Running the GUI
180
GUI Limitations
182
Troubleshooting
182
Java Plug-In
187
Status Table
190
Properties Panel
191
Output Panel
191
Message Bar
192
Exiting the GUI
192
Common Tasks
192
Resource Labels
201
Resource Tree
202
Comm Path Status
202
Row Height
202
Column Width
202
General Tab
208
CommPaths Tab
210
Resources Tab
211
Operator Tasks
212
Advanced Tasks
213
LCDI Commands
214
LifeKeeper Flags
218
Resource Actions
220
Alarm Classes
222
Technical Notes
234
Cluster Example
240
Description
244
LifeKeeper Core
245
Data Replication
253
SAP Recovery Kit
261
LVM Recovery Kit
262
MD Recovery Kit
264
From Windows:
267
From Linux:
268
Explanation
275
Introduction
277
Examples
303
Field Tips
307
Administration
315
Pause and Resume
318
Mirror Actions
322
Mirror Settings
322
Example:
324
Server Failure
325
Method 1
326
Method 2
327
TCP/IP Tuning
329
IP Resource
345
Requirements
346
Before You Start
346
Menus 148
368
Message Bar 170
368
Mirror Status
368
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