7 SPL.pptx spl ppt in software engineering
- 1. Introduction to Software Product Lines (SPL)
- 2. Software Product Line (SPL) ▪ A set of software-intensive systems sharing a common, managed set of features that satisfy 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.
- 3. Evolution of Software Development Subroutines Modules Objects Components Product Lines 70s 80s 90s Late 90s 2000
- 4. Overview of SPL Develop core product Develop product 2 Develop product 3 CORE 1-Spl 2-Spl 3-Spl In the product line manager’s view, it should go like this: Commonality Variability
- 5. 5 June 25, 2008 Software Product Line Engineering Software product lines refers to engineering techniques for creating a portfolio of similar software systems from a shared set of software assets § A product line represents a family of manufactured products § A product line architecture explicitly captures the commonality and variability of a product line components and their compositions Software Product Line Engineering makes it possible to - create software for different products - use variability to customize the software to each different product
- 6. ▪ Software is becoming complex ▪ Reuse is becoming an imperative ▪ Mass customization – producing goods and services to meet individual customer's needs – should be done with near mass production efficiency Product Lines - Motivation Handcrafted for individual customers Production Line – Mass Production Mass Customization: large-scale production tailored to individual customers’ needs
- 7. Product Lines - Motivation ▪ Any organisation that develops software creates multiple software applications that have some characteristics in common. ▪ Whatever the commonalities are amongst the software applications, it is important that these commonalities be managed properly so that the organization can realize the highest economy of scale. Google Communication Solutions GMail Hangouts Text Communication Document Share Attachments Undo Send ... Passive Communication Video Message Team Chats Active Communication
- 8. Product Lines – Goals and Characteristics ▪ The three main goals of a software product line are to reduce cost, improve delivery time, and improve quality. ▪ A software product line is a "family of products designed to take advantage of their common aspects and predicted variabilities“ ▪ The software product line practice was designed to manage software products, and their commonalities were designed to maximize the benefits to the organization. SPL Reduced Cost Improved Delivery Time Improved Product Quality Reusability Customisation
- 9. June 25, 2008 Product Line Engineering Framework Domain Engineering: Define and realize the commonality and variability. The goal is to establish a reusable platform Application Engineering: Reuse domain artifacts, exploiting variability to build a product. The goal is to derive a product from the platform established in the Domain Engineering phase Based on the “Software Product Line Engineering” book by Klaus Pohl,Günter Böckle and Frank J. van der Linden Product Management Application Requirements Engineering Application Design Application Realisation Application Testing Domain Artefacts incl. Variability Model Requirements Architecture Components Tests Application N – Artefacts incl. Variability Model Requirements Architecture Components Tests Application 1 – Artefacts incl. Variability Model Application Engineering Domain Engineering Domain Requirements Engineering Domain Design Domain Realisation Domain Testing Product Management
- 10. Managing Product Line Systems ▪ A product line is a decomposition of the entire application portfolio of an organization according to these common characteristics. Figure 4-1. Product line development.
- 11. Core Asset Development ▪ Core asset development is the creation and maintenance of the artifacts or core assets in the product line. ▪ These core assets are used to create systems that match the quality criteria of the product line. For example, if the types of products that are developed in the product line have a high maintainability requirement, then the core assets should reflect this requirement and account for the need for good maintainability. ▪ The goal of the core asset development activity is to create a capability within the organization to produce a particular type of application and will thus yield the same or similar software architecture.
- 12. Product Development ▪ The second constituency is product development. ▪ Product development involves the creation of products or systems from the core assets of the product line. ▪ If a system requires an asset that is not included in the core assets, the core asset must be created if the asset can be shared across multiple products in the product line. It is a strategic decision whether or not to build a new core asset or to create a product-specific feature to the project under development. ▪ If the core asset that exists in the product line does not match the quality requirements of the product under development, the core asset may be enhanced or modified.
- 13. Management ▪ Management must be involved to ensure that the two constituencies are interacting correctly. ▪ Instituting a product line practice at an organization requires a strong commitment from management. It is also important to identify which assets are part of the product line and which ones are part of the development of the individual products of the system. ▪ Management consists of the management of individual projects within the product line, as well as overall product line managers. The role of product line manager is one of a product line champion. ▪ The champion is a strong, visionary leader who can keep the organization working toward the creation of core assets while limiting any negative impact on project development.
- 14. Software Product Line Development Organization SPL Production Product 2 Product 3 Product 1 The focus of our work is on product production as a system that is engineered to have specified production qualities and predictable outputs. The goal is to reduce the risk to product line organizations by providing explicit techniques for strategizing and planning for product production. How can product development satisfy the organization’s goals for the software product line? Production Strategy What processes, models, and technologies can be used to ensure consistency across the core assets? Production Method Production Plan What does the product developer need to know to effectively utilize the core assets to develop products? Core Assets The core assets and product production system must be jointly engineered to achieve the organization’s goals for the software product line.
- 15. Product Line Benefits ▪ From the SEI: Benefits ▪ Product lines can help organizations overcome the problems caused by resource shortages. Organizations of all types and sizes have discovered that a product line strategy, when skillfully implemented, can produce many benefits—and ultimately give the organizations a competitive edge. • Improved productivity by as much as 10x • Increased quality by as much as 10x • Decreased cost by as much as 60% • Decreased labor needs by as much as 87% • Decreased time to market (to field, to launch) by as much as 98% • Ability to move into new markets in months, not years
- 16. Introduction to Model-driven Product Line Engineering (PLE) Obstacles Larges upfront investment Poor connection with regular “single- system” technology Vision Capture core software assets as platform-independent models (PIMs) Automatically map PIMS to PSMs to code through model transformation Model-Driven Engineering (MDE) Vision Development activities oriented around product families Manage commonalities and variabilities 1 2 3 Product-Line Engineering (PLE)
Editor's Notes
- #14: The SEI identified the importance of a product production focus early, for example, in the Software Product Lines book.