The Promise and

Challenge of Runtime

Variability

park joonho

2016.05.31

No.3 / Assigment

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Agenda

• Introdution

• Technology and Design

• Feature Modeling

• Binding Design-Time and Runtime Variability

• The challenges of runtime variability

• Open and closed variability models

• Runtime checking and rebinding

• Conclusion

2

Introduction -Definition

• SPLs : Software product lines

• Development style of products - Changes with time

• Individual and Standard software

• Mass Customization- Large scale production of goods tailored

to individual customer’s need

A software product line is a set of software-intensive systems that share a

common, managed set of features satisfying the specific needs of a particular

market segment or mission and that are developed from a common set of

core assets in a prescribed way.- Software Engineering Institute | Carnegie Mellon

3

Introduction -Definition

• FMs(Feature Model) : common approach to

designing products that share a set of common

characteristics or are in the same market segment.

• ex.

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Introduction -Definition

• Context-aware : Including autonomic and ubiquitous

computing systems and software ecosystems

• Ubiquitous : Pervasive Computing

• Proactive/Autonomic Computing

• ex) Service-oriented computing

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Introduction -Definition

• Context-aware / What is Context ?

• Not just “deliver any service at any time, anywhere”, but rather “delivering the right service at the rightmoment”

Louise BarhuusDepartment of Design and Use of Information Technology

The IT University of Copenhagen

“An example of a piece of relevant context information is the most common question posed when communicating on mobile phones: ‘Where are you?’”

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Technology and Design

• Feature Modelingcommon approach - to design products

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8

Technology and Design

• Binding Design-Time and Runtime Variability

• Runtime variability : Those product design choices

visible to customers and system users, who can

select among available configurable options.

• Design-time variability : hidden to the user and

managed by the product’s developers, who may

decide, for cost or other reasons, to activate certain

design options in a specific variant.

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Technology and Design• Variability …Differences among products in PL

• Variation Point … A point where / A variation can

occur

… Must be bound for each product

… Bind when?

… Bind how?

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Technology and Design• The challenges of runtime variability

• contemporary variability models face three main

challenges:

1. representing runtime variability, modifying variation points in existing and

new software units during system execution, and automating system

reconfiguration

2. automating runtime validation and checking reconfigured feature models to

maintain system consistency and stability

3. automating deployment and rebinding of reconfigured products at runtime

with minimal interruption.

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Technology and Design

• The challenges of runtime variability

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Technology and Design

• Open and closed variability models

• Variability model : add, remove, modify variants,

variation points

• Software implementing the new variant must be

added to the system

Add : mom : IMmonitoring13

Technology and Design

• Runtime checking and rebinding

• Runtime rebinding mechanisms exploit variability,

and configurable dynamic libraries reconnect the

system or part of it to a different target or

configuration.

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Conclusion

• Runtime checking and rebinding

• Runtime variability offers a good choice for many

systems that experience dynamic change in their

properties and context.

• Selecting and activating features at runtime is far

more complicated than reconfiguration.

• Automating decision making in FMs would go a long

way toward achieving DSPLs.

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faster, deterministic

Automation

well defined structures although the system

Increased Quality

Thank You

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