BT

Your opinion matters! Please fill in the InfoQ Survey!

A Rich Internet Application (RIA) Pattern

| by Abel Avram Follow 4 Followers on Jan 28, 2009. Estimated reading time: 1 minute |

A note to our readers: As per your request we have developed a set of features that allow you to reduce the noise, while not losing sight of anything that is important. Get email and web notifications by choosing the topics you are interested in.

Microsoft’s patterns&practices has published a RIA pattern under the Application Architecture Guide 2.0 project. The pattern addresses a 3-tier scenario providing a solution for it.

The scenario considers a RIA accessing a database without transferring any sensitive data by using a 3-tier design:

ria1

The proposed solution is:

ria2

The solution makes use of the following patterns:

  • User interface processing is handled by a Model-View-Controller pattern.
  • The user interface is composed of multiple controls, with some that can be bound to data elements.
  • A proxy is used to communicate between the presentation layer and service layer
  • The Data Transfer Object (DTO) pattern is used to package multiple data structures into one.
  • The service layer provides translation between internal and external data structures.
  • The business layer uses a façade pattern to support coarse-grained message-based operations.
  • Transaction Script objects are used to handle business request processing.
  • A Repository pattern is used to access domain entities.
  • A Domain Entity pattern is used to define business entities that contain data only.
  • A Data Mapper pattern is used to map domain entities to the database schema.

The guide explains in detail each pattern used and offers a technical solution which is, of course, based on Microsoft’s products. The respective solution can be nonetheless used with different products including open source ones.

Rate this Article

Adoption Stage
Style

Hello stranger!

You need to Register an InfoQ account or or login to post comments. But there's so much more behind being registered.

Get the most out of the InfoQ experience.

Tell us what you think

Allowed html: a,b,br,blockquote,i,li,pre,u,ul,p

Email me replies to any of my messages in this thread
Community comments

Really? by Mark N

Do they really need to define a pattern for this?

Every time someone misuses the DTO pattern or misidentifies it, a clown dies. You don't need a DTO to "send" objects, only to "receive" them only then if your plaform can only have one return type.
It seems they separate the "business" and "service" layer. Not sure what this gains you or even why.
Domain entities are only data? That is what DTOs are. When I retrieve objects in a list, I sometimes use a "SearchResult" or "ReportObject" but these are created at the "Data Mapper" level.

Allowed html: a,b,br,blockquote,i,li,pre,u,ul,p

Email me replies to any of my messages in this thread

Allowed html: a,b,br,blockquote,i,li,pre,u,ul,p

Email me replies to any of my messages in this thread

1 Discuss

Login to InfoQ to interact with what matters most to you.


Recover your password...

Follow

Follow your favorite topics and editors

Quick overview of most important highlights in the industry and on the site.

Like

More signal, less noise

Build your own feed by choosing topics you want to read about and editors you want to hear from.

Notifications

Stay up-to-date

Set up your notifications and don't miss out on content that matters to you

BT