Professional Visual Basic 6 D Istributed Objects

by Rocky Lhotka

• ISBN13: 9781861002075
• ISBN10: 1861002076
• Format: Trade Paper
• Copyright: 1999-06-01
• Publisher: John Wiley & Sons Inc

Summary

Many VB developers face the challenge of building scalable applications using distributed COM objects in Visual Basic 6. There are many books which describe n-tier architecture and also object-oriented programming, but this book is about merging the best capabilities of the Object-Oriented (OO) approach with a system architecture.

Table of Contents

Introduction	p. 1
What's Covered in This Book	p. 1
COM and DCOM	p. 2
Component-based Scalable Logical Architecture	p. 4
N-level Object State Rollback	p. 5
Implementing n-level has-a Relationships	p. 6
Data Binding With Business Objects	p. 7
Asynchronous Messages Via MSMQ	p. 8
RDS: Object State Passing Via HTTP	p. 9
Load balancing across MTS servers	p. 10
Who Is This Book For?	p. 10
What You'll Need To Use This Book	p. 10
Conventions Used	p. 11
Tell Us What You Think	p. 11
Source Code	p. 11
Support	p. 12
Distributed Objects	p. 15
Overview	p. 15
Distributed Objects	p. 15
Client/Server	p. 16
Object-Oriented Development	p. 20
Distributed Objects: Combining C/S and OO	p. 27
Component-based Scalable Logical Architecture	p. 28
Overview of the CSLA	p. 28
Physical Model	p. 31
Implementing Applications with CSLA	p. 40
Summary	p. 51
Task Manager Application	p. 53
Overview	p. 53
Task Manager Application	p. 54
UI-centric Objects	p. 57
Data-centric Objects	p. 72
Data Tables	p. 92
A Simple User Interface	p. 97
Summary	p. 108
Complex Object State Rollback	p. 111
Overview	p. 111
N-level Rollback	p. 112
Single-level Rollback	p. 112
2-level Rollback	p. 113
N-level Rollback	p. 115
Updating the Task Manager Application	p. 128
Adding the Task Class	p. 129
Adding the Tasks Class	p. 134
Updating the Project Class	p. 138
Updating the Projects Class	p. 141
Updating the Client Class	p. 144
Handling Deletion of Child Objects	p. 146
Updating the User Interface	p. 153
Summary	p. 158
Passing Object State Across the Network	p. 161
Overview	p. 161
Introducing the SuperState	p. 162
Serializing Object State	p. 163
Passing Objects by Value	p. 173
Defining the SuperState	p. 174
Creating a SuperState	p. 177
Updating the Task Manager Application	p. 183
Updating the TaskObjects Project	p. 184
Updating the TaskServer Project	p. 194
Summary	p. 210
Binding to Business Objects	p. 213
Overview	p. 213
Visual Basic Data Binding Architecture	p. 214
Creating a Data Source in Visual Basic	p. 217
Setting up the ODSOLEDB Project	p. 219
Implementing the Object List	p. 221
Implementing the Data Source Object	p. 223
Implementing the Simple Provider Objects	p. 228
Registering the Data Source	p. 245
Updating the Task Manager Application	p. 249
Adding References	p. 249
Data Binding in ClientEdit	p. 250
Data Binding in ProjectEdit	p. 259
Data Binding in TaskEdit	p. 259
Summary	p. 261
Using Microsoft Message Queue	p. 263
Overview	p. 263
Microsoft Message Queue	p. 266
MSMQ Overview	p. 266
MSMQ Availability and Tools	p. 271
MSMQ Messages	p. 273
MSMQ Queues	p. 274
Architectural Approaches	p. 277
Referencing the MSMQ Library	p. 278
Basic Components	p. 278
Application Models	p. 286
Integration with the CSLA	p. 294
Persistable UI-centric Objects	p. 295
Sending Raw State Data	p. 301
Action-based Objects	p. 304
Updating the Task Manager Application	p. 311
Creating the Receiver	p. 311
Updating the Task Objects Project	p. 318
Summary	p. 319
Distributed Objects and the Web	p. 321
Overview	p. 321
Object State and IIS	p. 322
Storing Data in IIS	p. 323
Updating the Task Manager Application	p. 327
Distributing Objects to the Browser	p. 333
Storing Data Across Pages	p. 334
Creating the Session Object	p. 336
Updating the Task Manager Application	p. 342
Using Remote Data Services	p. 353
How RDS Works	p. 354
Updating the Task Manager Application	p. 356
Summary	p. 361
Implementing a Load Balancing Cluster	p. 363
Overview	p. 363
Load Balancing	p. 364
Load Balancing Techniques	p. 364
Load Balancing Technologies	p. 366
Implementing a Cluster	p. 368
The Worker Monitor	p. 371
The Cluster Monitor	p. 379
The Cluster Server	p. 406
Implementing Client Software	p. 410
Updating the Task Manager Application	p. 415
Updating TaskProxyServer	p. 415
Summary	p. 417
Supporting Code	p. 419
Buffer Object	p. 419
BrokenRules Object	p. 421
Package and Deployment Wizard	p. 423
Installing Components	p. 423
Using the Package and Deployment Wizard	p. 423
Package and Deployment Wizard	p. 423
Installing Components	p. 423
Using the Package and Deployment Wizard	p. 423
Index	p. 433
Table of Contents provided by Syndetics. All Rights Reserved.