Application Architecture Guide 2.0 BETA 1 - Willy .Net

Coupling and Cohesion
Data Access
Exception Management
Logging and Instrumentation
User Experience
Validation
Workflow
after deployment, where you store configuration data, and how you
protect configuration data.
Coupling and cohesion are strategies concerned with layering,
separating application components and layers, and organizing your
application trust and functionality boundaries.
Data access strategies describe techniques for abstracting and accessing
data in your data store. This includes data entity design, error
management, and managing database connections.
Exception management strategies describe techniques for handling
errors, logging errors for auditing purposes, and notifying users of error
conditions.
Logging and instrumentation represents the strategies for logging key
business events, security actions, and provision of an audit trail in the
case of an attack or failure.
User experience is the interaction between your users and your
application. A good user experience can improve the efficiency and
effectiveness of the application, while a poor user experience may deter
users from using an otherwise well-designed application.
Validation is the means by which your application checks and verifies
input from all sources before trusting and processing it. A good input
and data validation strategy takes into account not only the source of
the data, but also how the data will be used, when determining how to
validate it.
Workflow is a system-assisted process that is divided into a series of
execution steps, events, and conditions. The workflow may be an
orchestration between a set of components and systems, or it may
include human collaboration.
Key Engineering Decisions
Use the architecture frame as a way to organize and think about key engineering decisions. The
following table shows key engineering decisions for each category in the architecture frame.
Category
Key Problems
Authentication and
• How to store user identities.
Authorization
• How to authenticate callers.
• How to authorize callers.
• How to flow identity across layers and tiers
Caching and State • How to choose effective caching strategies.
• How to improve performance by using caching.
• How to improve security by using caching.
• How to improve availability by using caching.
• How to keep cached data up to date.
• How to determine when to use a custom cache.
• How to determine the data to cache.
• How to determine where to cache the data.
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