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C++ Network Programming 2

C++NPv2.ppt

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C++ Network Programming NPv2.ppt

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C++ Network

Programming

Systematic Reuse with

ACE & Frameworks

Dr. Douglas C. Schmidt

d.schmidt@vanderbilt.edu

www.dre.vanderbilt.edu/~schmidt/

Professor of EECS

Vanderbilt

University

Nashville,

Tennessee

Presentation Outline

•

Patterns, which embody

reusable software

architectures & designs

•

Frameworks, which can

be customized to support

concurrent & networked

applications

Cover OO techniques & language features that enhance software quality

•

OO language features, e.g., classes, dynamic binding &

inheritance, parameterized types

Presentation Organization

1. Overview of product-line

architectures

2. Overview of frameworks

3. Server/service & configuration

design dimensions

4. Patterns & frameworks in ACE +

applications

Air

Frame

GPS

FLIR

Legacy distributed real-time &

embedded (DRE) systems

have historically been:

•

Stovepiped

•

Proprietary

•

Brittle & non-adaptive

•

Expensive

•

Vulnerable

Consequence:

Small HW/SW

changes have big

(negative) impact

on DRE system

QoS & maintenance

GPS

FLIR

Nav

HUD

IFF

Cyclic

Exec

F-15

Air

Frame

Nav

HUD

GPS

IFF

FLIR

Cyclic

Exec

A/V-8B

Air

Frame

Cyclic

Exec

Nav

HUD

IFF

F/A-18

Air

Frame

Nav

HUD

GPS

IFF

FLIR

Cyclic

Exec

UCAV

Motivation

F-15

product

variant

A/V 8-B

product

variant

F/A 18

product

variant

UCAV

product

variant

Product-line

architecture

Hardware (CPU, Memory, I/O)

OS & Network Protocols

Host Infrastructure Middleware

Distribution Middleware

Common Middleware Services

•

Frameworks factors out many reusable general-purpose & domain-

specific services from traditional DRE application responsibility

•

Essential for product-line architectures (PLAs)

•

Product-lines & frameworks offer many configuration opportunities

•

e.g., component distribution & deployment, user interfaces & operating

systems, algorithms & data structures, etc.

Air

Frame

Nav

HUD GPS

IFF

FLIR

Domain-specific Services

Motivation

Overview of Product-line Architectures (PLAs)

•

PLA characteristics are captured via Scope,

Commonalities, & Variabilities (SCV) analysis

•

This process can be applied to identify

commonalities & variabilities in a domain to guide

development of a PLA [Coplien]

James Coplien et al.

Commonality & Variability

in Software Engineering,

IEEE Software 1998

•

e.g., applying SCV to Bold Stroke

•

Scope: Bold Stroke component architecture, object-

oriented application frameworks, & associated

components, e.g., GPS, Airframe, & Display

OS & Network Protocols

Host Infrastructure Middleware

Distribution Middleware

Common Middleware Services

Domain-specific Services

Air

Frame

Nav

HUD GPS

IFF

FLIR

Reusable

Architecture

Framework

Reusable

Application

Components

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