Expert VB 2005 Business Objects

684 Pages·5.959 MB·English

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Expert VB 2005
Business Objects
Second Edition
Rockford Lhotka
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Expert VB 2005 Business Objects,Second Edition
Copyright © 2006 by Rockford Lhotka
All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means,
electronic or mechanical, including photocopying, recording, or by any information storage or retrieval
system, without the prior written permission of the copyright owner and the publisher.
ISBN-13 (pbk): 978-1-59059-631-9
ISBN-10 (pbk): 1-59059-631-5
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Lead Editor: Jonathan Hassell
Technical Reviewer: Petar Kozul
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Contents at a Glance
About the Author ......................................................................xv
About the Technical Reviewer ...........................................................xvi
Acknowledgments ....................................................................xvii
Introduction ..........................................................................xix
CHAPTER 1 Distributed Architecture.............................................1
CHAPTER 2 Framework Design.................................................35
CHAPTER 3 Business Framework Implementation...............................93
CHAPTER 4 Data Access and Security .........................................163
CHAPTER 5 Completing the Framework........................................239
CHAPTER 6 Object-Oriented Application Design ................................325
CHAPTER 7 Using the CSLA .NET Base Classes.................................365
CHAPTER 8 Business Object Implementation...................................407
CHAPTER 9 Windows Forms UI................................................465
CHAPTER 10 Web Forms UI ....................................................515
CHAPTER 11 Web Services Interface............................................567
CHAPTER 12 Implementing Remote Data Portal Hosts............................607
INDEX ...........................................................................627
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Contents
About the Author ......................................................................xv
About the Technical Reviewer ...........................................................xvi
Acknowledgments ....................................................................xvii
Introduction ..........................................................................xix
CHAPTER 1 Distributed Architecture........................................1
Logical and Physical Architecture .......................................1
Complexity .....................................................3
Relationship Between Logical and Physical Models ...................4
A5-Layer Logical Architecture.....................................8
Applying the Logical Architecture .................................13
The Way Ahead ................................................18
Managing Business Logic.............................................18
Potential Business Logic Locations................................18
Business Objects...............................................22
Mobile Objects.................................................25
Architectures and Frameworks.........................................33
Conclusion .........................................................33
CHAPTER 2 Framework Design.............................................35
Basic Design Goals ..................................................36
N-Level Undo Capability.........................................37
Tracking Broken Business Rules..................................40
Tracking Whether the Object Has Changed .........................41
Strongly Typed Collections of Child Objects.........................41
Simple and Abstract Model for the UI Developer.....................43
Supporting Data Binding.........................................47
Object Persistence and Object-Relational Mapping...................50
Custom Authentication ..........................................57
Integrated Authorization .........................................58
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Framework Design...................................................58
Business Object Creation ........................................59
N-Level Undo Functionality.......................................64
Data Binding Support ...........................................67
Validation Rules................................................68
Data Portal ....................................................71
Custom Authentication ..........................................84
Integrated Authorization .........................................85
Helper Types and Classes........................................86
Namespace Organization .............................................89
Conclusion .........................................................91
CHAPTER 3 Business Framework Implementation........................93
Setting Up the CSLA .NET Project.......................................94
Creating the Directory Structure...................................95
Supporting Localization..........................................95
Csla.Core Namespace................................................96
IBusinessObject Interface........................................97
IUndoableObject Interface........................................97
IEditableCollection Interface......................................98
IReadOnlyObject Interface........................................99
IReadOnlyCollection Interface.....................................99
ICommandObject Interface.......................................99
ObjectCloner Class..............................................99
BindableBase Class............................................100
NotUndoableAttribute Class .....................................104
UndoableBase Class ...........................................104
BusinessBase Class............................................112
ReadOnlyBindingList Class......................................130
Csla.Validation Namespace...........................................131
RuleHandler Delegate..........................................132
RuleArgs Class................................................132
RuleMethod Class .............................................133
ValidationRules Class ..........................................134
BrokenRule Class..............................................137
BrokenRulesCollection Class ....................................137
ValidationException............................................138
Csla.Security Namespace............................................139
RolesForProperty Class.........................................139
AccessType Enum.............................................140
AuthorizationRules Class........................................140
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Csla Namespace ...................................................143
BusinessBase Class............................................143
BusinessListBase Class.........................................146
ReadOnlyBase Class...........................................159
ReadOnlyListBase Class........................................160
Conclusion ........................................................161
CHAPTER 4 Data Access and Security ....................................163
Data Portal Design..................................................164
Channel Adapter and Message Router Patterns.....................165
Distributed Transaction Support..................................168
Context and Location Transparency ..............................170
Enhancing the Base Classes..........................................173
FactoryMethods and Criteria....................................175
Save Methods.................................................176
Data Portal Methods ...........................................178
Csla.MethodCaller Class........................................181
Csla.Server.CallMethodException ................................187
Csla.RunLocalAttribute Class....................................188
Csla.DataPortalEventArgs Class..................................188
Csla.DataPortal Class ..........................................189
Csla.Server.IDataPortalServer ...................................197
Csla.DataPortalClient.IDataPortalProxy............................198
Csla.DataPortalClient.LocalProxy.................................198
Csla.DataPortalClient.RemotingProxy .............................200
Csla.Server.Hosts.RemotingPortal................................202
Csla.DataPortalClient.EnterpriseServicesProxy......................204
Csla.Server.Hosts.EnterpriseServicesPortal ........................206
Csla.DataPortalClient.WebServicesProxy ..........................210
Csla.Server.Hosts.WebServicePortal..............................213
Distributed Transaction Support.......................................215
Csla.TransactionalTypes........................................215
Csla.TransactionalAttribute......................................215
Csla.Server.DataPortal .........................................216
Csla.Server.ServicedDataPortal..................................220
Csla.Server.TransactionalDataPortal..............................221
Message Router....................................................222
Csla.CriteriaBase..............................................223
Csla.Server.SimpleDataPortal....................................223
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Context and Location Transparency....................................229
Csla.Server.DataPortalContext...................................229
Csla.Server.DataPortalResult....................................232
Csla.Server.DataPortalException .................................233
Csla.ApplicationContext.........................................233
Conclusion ........................................................238
CHAPTER 5 Completing the Framework...................................239
Additional Base Classes .............................................240
CommandBase................................................240
NameValueListBase............................................243
Custom Authentication ..............................................247
BusinessPrincipalBase .........................................250
Sorting Collections..................................................251
SortedBindingList..............................................252
Date Handling......................................................267
SmartDate....................................................268
Common Business Rules.............................................277
CommonRules ................................................278
Data Access.......................................................281
SafeDataReader...............................................281
DataMapper..................................................285
Reporting .........................................................290
ObjectAdapter.................................................291
Windows Data Binding ..............................................299
ReadWriteAuthorization.........................................299
BindingSourceRefresh..........................................306
Web Forms Data Binding.............................................307
CslaDataSource...............................................309
CslaDataSourceView...........................................311
CslaDataSourceDesigner........................................314
CslaDesignerDataSourceView ...................................314
ObjectSchema ................................................318
ObjectViewSchema............................................319
ObjectFieldInfo................................................320
Conclusion ........................................................323
CHAPTER 6 Object-Oriented Application Design .........................325
Application Requirements............................................326
Use Cases....................................................327
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Object Design......................................................330
Initial Design..................................................330
Revising the Design............................................332
Custom Authentication .........................................343
Using CSLA .NET ...................................................344
Database Design ...................................................347
Creating the Databases.........................................348
PTracker Database ............................................349
Security Database.............................................362
Conclusion ........................................................363
CHAPTER 7 Using the CSLA .NET Base Classes ..........................365
Business Object Life Cycle...........................................365
Object Creation................................................366
Object Retrieval...............................................369
Updating Editable Objects.......................................371
Disposing and Finalizing Objects.................................376
Business Class Structure ............................................378
Common Features.............................................378
Class Structures...............................................383
Conclusion ........................................................405
CHAPTER 8 Business Object Implementation.............................407
ProjectTracker Objects ..............................................407
Setting Up the Project..........................................408
Business Class Implementation.......................................410
Project ......................................................410
ProjectResources..............................................431
ProjectResource...............................................436
Assignment...................................................441
RoleList......................................................443
Resource and Related Objects...................................445
ProjectList and ResourceList ....................................448
Roles........................................................451
Role.........................................................454
Implementing Exists Methods ...................................456
Custom Authentication ..............................................458
PTPrincipal...................................................458
PTIdentity....................................................460
Conclusion ........................................................464
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CHAPTER 9 Windows Forms UI ............................................465
Interface Design....................................................465
User Control Framework........................................467
User Control Design............................................469
Application Configuration .......................................469
PTWin Project Setup ...........................................472
User Control Framework.............................................472
WinPart......................................................472
MainForm....................................................474
Login Form...................................................480
Business Functionality...............................................482
MainForm....................................................482
RolesEdit.....................................................485
Project List...................................................494
ProjectEdit ...................................................497
Conclusion ........................................................513
CHAPTER 10 Web Forms UI..................................................515
WebDevelopment and Objects........................................515
State Management..................................................517
State on the Web Server........................................518
Transferring State to or from the Client............................520
State in a File or Database......................................521
Interface Design....................................................522
Application Configuration .......................................525
PTWeb Site Setup .............................................527
Master Page..................................................528
Login Page...................................................533
Business Functionality...............................................540
RolesEdit Form................................................540
ProjectList Form...............................................550
ProjectEdit Form...............................................554
Conclusion ........................................................565
CHAPTER 11 Web Services Interface .......................................567
Overview of Web Services............................................568
The SOAP Standard............................................568
Message-Based Communication.................................569
SOAP and Web Services........................................569
SOAP,Web Services,and the .NET Framework......................570
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Web Services and SOA ..............................................571
Services vs.Components.......................................571
Designing a Web Services Interface ...................................575
Component-Based vs.Service-Oriented Design ....................575
Grouping Web Methods into Web Services.........................576
Returning and Accepting Data...................................577
Authentication ................................................579
Web Service Implementation .........................................581
Application Configuration .......................................581
PTWebService Site Setup.......................................583
PTService....................................................585
Authentication ................................................585
Component-Based Web Methods.................................589
Service-Oriented Web Methods..................................592
Web Service Consumer Implementation................................596
ASimple Smart Client..........................................599
Conclusion ........................................................605
CHAPTER 12 Implementing Remote Data Portal Hosts....................607
Data Portal Channel Comparison......................................608
Factors for Comparison.........................................608
.NET Remoting.....................................................611
Implementation ...............................................612
Web Services......................................................615
Implementation ...............................................616
Enterprise Services .................................................618
Creating the Proxy/Host Assembly................................618
Client Setup ..................................................625
Conclusion ........................................................626
INDEX ...........................................................................627