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A Framework for Web and
WinForms (Client-Server)
Applications
“Enterprise Software Architecture”
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Outline
Short introductions
Start with a demo (Web and WinForms)
Background and technical details
Code walkthrough
Building an application
Topics in depth
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Demo 1
Sample Application
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The goal is
Provide a framework of reusable
software components to simplify,
speedup, reduce the cost, and assist in
the creation of Web and WinForms
applications which access databases
and follow a business process
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Technical Summary
 Framework processes client requests (Web
or Windows GUI), handles business logic,
accesses database, and generates output
(GUI, XML or XHTML) – full cycle
 Encapsulates all database access as well as
display and form handling
 A generic solution for writing applications, but
with a powerful extensibility model!
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Technical Details
 Reusable layered .NET objects
– Our own design and architecture for a Web and
WinForms business applications.
– Not using bound controls or web form controls
– Object oriented
 Data access encapsulation
– Back-end independent approach for common
database providers
– Automatic SQL generation for searches and
CRUD (all form handling)
– Abstracted, key-based, optimistic-locking.
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Technical Details
 Metadata driven definition of forms, searches
and security
– Reusability
– Flexible solutions
– XML Based
 Code generation vs. Runtime driven
– One body of code
– No orphan code
– No regens
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Technical Details
 Stateless approach for both vertical and
horizontal scalability of Web Apps
– No object or object state maintained in memory
between requests – all gets persisted
– Objects created when needed
– Generic objects restore state quickly from
metadata, http request, and database
– Objects can reside in “MTS” i.e. “Serviced
Component” in .NET (“application server”)
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Technical Details
Multi-layer security and role-based logic
– Application logic security is used to
authenticate and authorize user access to
application and data
– login via Oracle, SqlServer, CustomDB,
LDAP, Windows, Passport, Certificate, etc.
– Framework metadata-driven role-based
security
– Native support for SSL
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Technical Details
Layered Application Architecture
– Core framework data components
– Core framework utility components
– Application extensibility components
– Platform or presentation specific layer
(Web, WinForms, Web Service, etc.)
Each encapsulate core framework
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Web/client to Server
WinForms
Browser
IIS
WAF Object
WAF Object
.NET
ASPX
pages
WAF Object
WAF Object
WAF Object
WAF Object
Database
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Demo 2
Behind the sample application..
(Database, metadata, security..)
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Framework Objects
 Two general business application
activities:
1. Searching for and listing record sets as
well as selecting records to navigate or
‘open’ them (DBFind)
2. Opening a single record, showing a form,
to create new, update, or delete
(DBRecord).
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Framework Objects
DBFind
– Searching for data to:
View (decision support)
Select as option (work flow, navigation)
Select to modify (transactions)
– Invoking actions on found records
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Framework Objects
 DBRecord
–
–
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–
–
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CRUD (Create, Read, Update, and Delete)
Validation of data entry
Applying business rules
Transactions
Single record or set handling
Linked records and foreign keys
Edit Form
Result Set Table display
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Framework Objects
 Metastore
– Holds Metadata for runtime data driven approach
– XML DOM as a global singleton object
– Holds all table definitions
 Fields for each table
 Search definitions for each table
 Edit form definitions for each table
– Security on most items
– System and Application Strings
– Multi language support on all items
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Framework Objects
Additional activities for most business
applications
– User Profile
– Session Control
– String dictionary
– Request Object
– URL builder
– Instrumentation (trace, audit, profile, etc.)
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Demo 3
Framework project walkthrough
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Runtime
Browser
IIS
.NET
ASPX
pages
Metastore
DBFind
DBRecord
Database
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XML to HTML
XML
Metastore
XML DOM
XML
Metadata
User
interface and
navigation
XPATH, DOM API
Tables
DBFind or
DBRecord
HTML
Fields
Forms
Basic
HTML
Searches
Java
Script
Searches
SQL
Forms
Database
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Framework Object Life Cycle
Create
The object
XML
SQL
Restore all
needed state
Process
Input
Perform
the work
Compose
output
Persist
state
SQL
Destroy
Object
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Code Example
Dim Record As WAFdbComponents.DBRecord
'Create a DBRecord object
Record = New WAFdbComponents.DBRecord()
'Build the object from metadata
If Record.Build("Company", "EditForm", MainMetaStore, Profile) Then
'Identify and read the record from the database
Record.PrimaryKeyValue = sPKey
If Record.ReadRecord Then
'Output HTML-form populated with the fetched data
Response.Write Record.EditFormHTML
End If
End If
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Demo 4
Code walkthrough (DBFind, DBRecord)
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Framework Extensions
Business Rules objects
Search Rules objects
Field validation objects
Authentication object
Property retriever
Function overrides
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Runtime
Browser
IIS
Metastore
DBRecord
ASPX
pages
IBusinessRules
Database
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Framework Object Life Cycle
Create
The object
XML
SQL
Process
Input
Restore all
needed state
Delegate to
Business Rules
Perform
the work
Delegate to
Business Rules
Persist
state
Compose
output
SQL
Destroy
Object
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Business Rules objects
 Objects implementing the IBusinessRules
interface
 Assigned to a DBRecord object (in metadata)
 Runtime framework delegation
CanRead(..)
CanCreate(..)
CanEdit(..)
CanWrite(..)
CanDelete(..)
CanDisplay(..)
IsValid(..)
ReadComplete(..)
WriteComplete(..)
DeleteComplete(..)
WriteAllComplete(..)
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Search Rules objects
Objects implementing the ISearchRules
interface
Assigned to a DBFind object (in
metadata)
Runtime framework delegation
CanDisplaySearch(..)
CanExecute (..)
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Field validation objects
Objects implementing the
IFieldValidation interface
Assigned to a Field object
Runtime framework delegation
IsValid(..)
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Demo 5
Business rule code walkthrough
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Web Framework
ASP.NET layer
Pages derived from System.Web.UI.Page
Encapsulates dbComponents work
Handles HTTP requests
Orchestrates HTML response
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html
Browser
http request (state, action-verb)
ASP.NET
webComponents
System.Web.UI.Page
dbComponents
DBFind
WafControllerPage
WafFormPage
DBRecord
WafForm
Profile
(Application derived form)
Session
Metastore
Database
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Demo 6
Web framework walkthrough
Building an Application!
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WinForms (Client/Server)
WinForms.NET layer
MDI Application Class
Forms derived from –
System.Windows.Forms.Form
Encapsulation of dbComponents
UI driven (no UI generation)
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User
WinForms.NET
guiComponents
dbComponents
Main Application window
Metastore
DBFind
File Edit Tools
FormDbFind
Inherits
System.Windows.For
ms.Form
DBRecord
MyForm
Inherits
FormDbRecord
Inherits
System.Windows.
Forms.Form
Profile
Database
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Demo 7
WinForms framework walkthrough
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Topics in depth
 UI generation - XML and HTML pages (using
customizable XSLTs if desired),
 SQL generation
 Back-end independent
 Generic exception handling
 Business rule extensibility
 Profile
 Session
 ...