Modifiability - 1

[changjurhee]

Quality Attributes

Type	Description	QA Scenario (Stimulus / Source of stiulus / Artifact / Environment / Response / Response measure)	Tatics
Modifiability	Provide the ability for the developer/maintainer to easily add or replace codecs	Changing the codec for video transmission by customer request should be possible within 5 hours. - Video codec change request - Customer - Video codec related software components - During video codec change - System supports the changed video codec - It takes less than 5 hours to change the video codec

[ju297]

Layer Pattern

• 장점사용하는 layer와 사용 당하는 layer가 확실하게 구분되어 하위 레이어만 교체하는데 용이
• Layer bridging을 한다면 변경 용이성을 달성할 수 없음

Pipes and Filters Pattern

• 데이터 스트림을 처리하기에 적합하며 교체 또한 용이
• 데이터 병렬처리에 대해서는 다소 부적합 할 수 있음

[changjurhee]

• Plug-in (Microkernel) Pattern
  • Benefits :
    • Plug-ins provide a controlled mechanism to extend a core product and make it useful in a variety of contexts.

[codekistone]

split module - The codec to be used in the system must be made into a separate module so that the codec can be changed only by replacing the module.