topical media & game development

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

pattern(s) / matrix / model(s) / resource(s)

Distributed Object Patterns

Software Engineering: risk challenge
CORBA - guidance (OO, C/S, IDL)
Object-Oriented Architectures

See CORBA Design Patterns

Corba Design Patterns

scale

Objects/Classes
MicroArchitectures
Framework
(class hierarchies)
Applications
(wrappers)
System
(horizontal, vertical, metadata)
Enterprise
reference models, infrastructure, policies)
Intra/Internet
(standards)

Object-Oriented Architectures

Application Design Patterns
System Design Patterns
Enterprise Design Patterns
Global Design Patterns

CORBA IDL as a baseis for interface definitions

Template Design Pattern

Pattern Name
Most applicable scale
Solution type
Intent
Diagram
Referemces
Applicability
Benefits and consequences
Variations
Rescaling to other levels
Related solutions
Example
Background
Resources

Is there competition for patterns?

standards -- too many, no guidelines, poorly supported

Criteria

interoperability
portablity

CORBA

is a commercial standard from OMG, whose mission it is to define interfaces for interoperable software using object-oriented technology

Object Management Architecture

high level infra-structure for distributed computing
reusable modular software
distributed heterogeneous systems

Key reasons for CORBA in the future

IDL -- universal notation for software interfaces
ORB -- infra-structure simplifies distributed computing

Architectures and Boundaries

surprisingly little detail is included in OOAD models
interfaces are treated as coding details, to be fleshed out at the programming level

architecture -- abstraction, management of change, complexity
interfaces -- language independent
implementation -- software modules

software problems are due to poor definitions and transfer of software boundaries

architecture = set of rules, guidelines, interface conventions

The architect defines a robust set of abstractions that manage complexity, change and other forces

issues of software partitioning
logical separation
flow of control
flow of information
timing and throughput
interface layering
hardware/software allocation
error handling
frequently overlooked

In a distributed system, the lack of a single address space and the need for independent reusable services are addressed by having a service-based architecture

	Stable/Reusable Interfaces	Changeable Specifications
Data/Interface Partitioning	IDL Interfaces	Data & Meta Data
Interface Specialization	Horizontal Interfaces	Vertical Interfaces

... mandating a single type system for all applications is unrealistic ...

risk is the universal force

Design Pattern Language -- Primal Forces

Functionality -- to meet end users requirements
Performance -- computation/network bound
complexity -- hotspots, redesign, abstraction
Change -- adaptability ...
IT Resources -- hardware / software
Technology Transfer -- education has a price tag

Application Design Patterns

maximizing parallelism -- distributed callback, partial processing, independent objects
improving object implementations -- dynamic attributes, instance reference, object wrapper, lock
modifying client stubs and other tricks -- library skeleton, fine-grained framework

System Design patterns -- horizontal, vertical, meta-data

Principles of object-oriented architectures ---architecture mining
fundamental structural patterns -- repository architecture, gateway
advanced system design -- architecture enforcement, replication, agents
Using OMG CORBA Services -- naming, trader, notification

Enterprise Design Patterns -- organisational infra structure

Global Design Patterns -- open systems/Int(e)r(a)net

[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

You may not copy or print any of this material without explicit permission of the author or the publisher. In case of other copyright issues, contact the author.

Distributed Object Patterns

Distributed Object Patterns

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot'); if (!slidemode) document.write('.html');document.write('>');

Corba Design Patterns

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-scale'); if (!slidemode) document.write('.html');document.write('>');

Object-Oriented Architectures

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-arch'); if (!slidemode) document.write('.html');document.write('>');

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-template'); if (!slidemode) document.write('.html');document.write('>');

Template Design Pattern

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-template-text'); if (!slidemode) document.write('.html');document.write('>');

Is there competition for patterns?

Criteria

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('-images-logo-0'); if (!slidemode) document.write('.html');document.write('>');

CORBA

Object Management Architecture

Key reasons for CORBA in the future

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-corba'); if (!slidemode) document.write('.html');document.write('>');

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-architecture'); if (!slidemode) document.write('.html');document.write('>');

Architectures and Boundaries

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-arch-b'); if (!slidemode) document.write('.html');document.write('>');

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-problem'); if (!slidemode) document.write('.html');document.write('>');

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-solution'); if (!slidemode) document.write('.html');document.write('>');

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-architecture-rules'); if (!slidemode) document.write('.html');document.write('>');

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-service'); if (!slidemode) document.write('.html');document.write('>');

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-stable'); if (!slidemode) document.write('.html');document.write('>');

Design Pattern Language -- Primal Forces

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-language'); if (!slidemode) document.write('.html');document.write('>');

Application Design Patterns

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-the-patterns'); if (!slidemode) document.write('.html');document.write('>');

System Design patterns -- horizontal, vertical, meta-data

Enterprise Design Patterns -- organisational infra structure

Global Design Patterns -- open systems/Int(e)r(a)net

document.write(' <a href=');if (!slidemode) { document.write('@slide-'); } else { document.write('patterns-dot.html#slide-'); } document.write('dot-the-patterns'); if (!slidemode) document.write('.html');document.write('>');