Workshop on Compositional Software Architectures
Call for Papers
January 6-8, 1998
- [Call for Papers]
Program] - [Participants]
Bibliography] - [Index
of Topics] - [Glossary]
Sponsors and Organizers
Objectives of the Workshop
The workshop will focus on the interactions between:
Fundamental concerns face organizations developing and maintaining large,
enterprise-critical, distributed applications.
component software architectures
web and distributed object architectures
Component software did not exactly set the world on fire five years ago.
Now we have new languages, maturing visions of compositional architectures
(CORBA, WWW, ActiveX, ....), the web as a distributed system with a low-entry
barrier, and emerging middleware service architectures. Do we have the
critical mass to jump start the component software cottage industry? Even
if the technology enablers are there, what is needed to establish an effective
component software market? What are the remaining barriers?
Application development teams spend too much time coping with the complexities
of their chosen middleware, services, tools, web, and programming environments.
An application's choices of underlying middleware products become pervasive
and irrevocable commitments of the application.
Complex distributed application logic must be delivered via the web, and
today there are object model and service architecture mismatches.
The goal of assembling applications from reusable components is still elusive
because business applications require system-wide properties like reliability,
availability, maintainability, security, responsiveness, manageability,
and scalability (the "ilities"). Assembling components and also achieving
system-wide qualities is still an unsolved problem. As long as the code
that implements ilities has to be tightly interwoven with code that supports
business logic, new applications are destined to rapidly become as difficult
to maintain as legacy code.
The workshop is intended to bring together a mix of leading industry,
government, and university software architects, component software framework
developers, researchers, standards develpers, vendors, and customers to
do the following:
better understand the state of practice of industry component software
initiatives (ActiveX, OMG's OMA/CORBA, Java, W3C) and how far they go in
solving problems of composability and plug-and-play.
better understand how software architectures play a role in integrating
web and object service architectures and in building systems that can maintain
architectural properties (e.g., composability, scalability, evolvability,
identify key technologies, directions and convergence approaches
and characterize open research problems and missing architectural notions.
The workshop will consist of a set of invited presentations and topic-centered
Structure and Content of the Workshop
Topics of interest (but not limited to):
State of practice in component software and software architecture - e.g.,
views from Microsoft, Netscape, JavaSoft, OMG/ODP, and the software architecture
State of practice in web + distributed object integration - e.g., views
from Netscape, Visigenc, Iona, JavaSoft, W3C, Microsoft, web-objects architecture
Characterizing the problem. What do large application developers
and enterprise software architects want? How do they avoid building more
unmaintainable legacy applications? How do they build applications with
fifteen year life cycles on middleware products that change annually? How
do they architect systems so that both functionality and architectural
-ilities can be upgraded over the application's life cycle? Approaches
to evolution of software.
Composing components. What are examples of minimal common infrastructures
that enable component composition. Are we there yet with respect to plug
and play? Problems with component software approaches (devils' advocate
positions) and solution approaches (counter arguments) - e.g., footprint,
too many interfaces, uncontrolled evolution. Economy of component
software. Is component software a silver bullet or a nightmare or
Composing object services. How can we compose object services?
could you make a competitive OODB from naming, persistence, transactions,
queries, etc.? Implicit interfaces and wrappers. What behavioral
extensions can be added implicitly to a system? Mechanisms like POA,
interceptors, before-after rules to guard objects to insure they are acted
on by implicit operations. Terminology - e.g., loose or tight coupling,
Architectural properties. What are ilities, i.e., some property
added to a system that is independent of the functionality of that system.
How to insert them into component software architectures? Say you
had a system doing something. How would it look different if ility
X was added or removed? Is there some kind of architectural level
where the boundary between the visibility/hiddeness of the ility changes?
What is needed in the architecture in order to add ilities?
Scaling component software architectures. Frameworks, patterns, configurations,
inter component protocols. Examples of composition involving heterogeneous
data sources. Federation - do we have to federate the services
when we have ORBs on 40,000,000 desktops? what can we say about the
federation pattern? end-to-end, top-to-bottom ilities like optimization,
QoS, security, ...
Adaptivity of component software architectures. Tailorability, evolvability,
assured services and graceful degradation, survivability.
Web object models, metadata and registry/repository in Internet/Web.
How do DOM, XML, PICS-NG, RDF, and the many metadata proposals relate to
object and agent definition languages?
Convergence of ORB and Web architectures. (Why) are both camps doing
the same things differently? How to avoid recreating the same set of services
like versioning on both architectures.
Explicit outcome - a workshop report to be available on the web soon after
the meeting. The workshop report will include:
workshop breakout session reports
summary of research issues, proposed architectural frameworks, key research
directions, i.e., key conclusions in a nutshell.
Implicit outcome - possible direction changes and convergence among technologies
as different groups (e.g., OMG, W3C, ODP, IETF) understand what others
bring to the party.
Position papers (around three pages) on a topic related to the workshop
theme should be sent to Craig Thompson (firstname.lastname@example.org) by November
21, 1997. Preferred format is HTML but .txt, .rtf, .ps., .pdf, or .doc
The workshop committee will announce accepted papers on or before December
7, 1997. All accepted position papers will be posted on the web. An
accepted position paper is a prerequisite for attending the workshop except
for a small number of invited speakers.
The workshop will be limited to around 60 participants. The workshop will
start at 8 a.m. on January 6 and end at noon on January 8. Breakfast will
be provided on days 1, 2 and 3; lunch on days 1 and 2; cash bar reception
on day 1.
The meeting hotel is the Monterey
Marriott, located two minutes' walk from Monterey Bay Fisherman's Wharf,
at 350 Calle Principal at Del Monte Blvd., Monterey, CA 93940, (408) 649-4234.
The room block under the name "Compositional Software Architecture Workshop"
will be held until December 15, 1997. Negotiated rates are $119/night
(up to 15 reservations at Government per diem of $71).
The workshop fee is $225 payable by check or credit card to MCC. Participants
can reserve hotel rooms and pre-register by completing the attached registration
form and sending it to Felisa Legaspi, MCC/WCL, 2099 Gateway Place,
Suite #450, San Jose, CA 95110. For questions, contact Felisa Legaspi
at (408) 573-4130-tel, (408) 573-4140-fax, email@example.com.
Directions: From the Monterey Airport/Hwy. 68: Take the Monterey
Fisherman's Wharf exit. At the first stoplight, turn right on Aguajito.
Continue on Aguajito until it ends at Del Monte. Turn left on Del Monte
and continue straight for three stoplights. At the third stoplight, get
in the left turn lane and continue straight on Del Monte to the hotel.
Taxi from Monterey Airport is $8. Valet parking is $12/day.
There is a public garage 1-2 block from the hotel.
November 21, 1997 - position papers due (extended from Nov 14)
December 7, 1997 - announce accepted papers. These will be available
on the web.
December 15, 1997 - last date for room block reservations
Randy Garrett, DARPA (co-chair)
Barry Leiner, consultant
Ted Linden, MCC
Andry Rakotonirainy, DSTC
Richard Soley, OMG (co-chair)
Craig Thompson, OBJS
Gio Wiederhold, Stanford
Thompson, Object Services and Consulting,
and Computer Technology Corporation (MCC)