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Smalltalk Solutions Daily Update: April 25, 2005

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James Robertson

Posts: 29924
Nickname: jarober61
Registered: Jun, 2003

David Buck, Smalltalker at large
Smalltalk Solutions Daily Update: April 25, 2005 Posted: Apr 25, 2005 3:51 PM
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This post originated from an RSS feed registered with Agile Buzz by James Robertson.
Original Post: Smalltalk Solutions Daily Update: April 25, 2005
Feed Title: Cincom Smalltalk Blog - Smalltalk with Rants
Feed URL: http://www.cincomsmalltalk.com/rssBlog/rssBlogView.xml
Feed Description: James Robertson comments on Cincom Smalltalk, the Smalltalk development community, and IT trends and issues in general.
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Today's update looks at Software Components in Smalltalk. Register today!

Programming with Software Components: From Globals to URIs, Classes to Interfaces

presentation

Staehli, Richard: Simula Research Laboratory

Monday 4 pm to 4:45 pm

Abstract: Component-Based Software Engineering (CBSE) promises to simplify the construction of high-quality applications through composition of off-the shelf components. This is arguably a fulfillment of the original promise of object-oriented programming; that objects may encapsulate arbitrary implementations.

Surprisingly, the Smalltalk community lags behind the industry in advancing CBSE technology. The idea of composing a computing system from components that may encapsulate heterogeneous programming language and runtime environment is at odds with Smalltalk's single image heritage. Further, todays component technology, such as CCM, force a programmer to choose when to use heavyweight components and when to use lightweight local class instances.

Our investigation into a Quality-of-Service (QoS) -aware component architecture suggests a way to improve Smalltalk programming by separating concerns of functional composition from concerns of component implementation. In this presentation I show how Smalltalk source code may be made more robust by replacing a global reference to an implementation class with a Universal Reference Identifier (URI) for a component interface type. This allows the implementation of this component to be determined at compile time, deployment time, or even upgraded dynamically at runtime without violating the semantics of the source code.

Bio: Richard Staehli has worked the past three years architecting and prototyping a Quality-of-Service (QoS) -aware component architecture in Smalltalk for Simula Research Laboratory in Oslo, Norway. He received a Ph.D. in 1996 from The Oregon Graduate Institute of Science & Technology and has since worked on video data types for Informix Software, on a CORBA application server for Oracle Corporation and as a senior technical consultant for the interactive web services firm AGENCY.COM .

See you in Orlando!

Read: Smalltalk Solutions Daily Update: April 25, 2005

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