1. On the horizon Chapter twenty-five of: Szyperski, Clemens et al. Component Software - Beyond Object-Oriented Programming. Second Edition

2. Contents  Advanced object composition Delegation Split Objects Environmental acquisition Dynamic inheritance  New forms of object and component abstraction Subject-oriented programming Aspect-oriented programming XML Components

3. Advanced object composition  Class composition is too static for many components applications  Object composition is usually based on message forwarding  The Loss of identity of the whole causes some problems

4. Delegation  Dependencies between base class and subclass  Delegation-based object composition problem  Performance aspects

5. Split Objects  A web of objects with a common identity established by means of delegation  Individually a fragment of a split object does not have object status  Delegations across split objects is excluded in this model  Hierarchical split objects  Reorganization

6. Environmental acquisition  Objects are embedded in a containment hierarchy  Delegation or forwarding requests are sent up the containment hierarchy

7. Dynamic inheritance  The idea is to generalize the concept of a base class to that of a base object selected at object construction time  Rely on delegation between an object and its base object

8. New forms of object and component abstraction  Fundamental property of objects  Traditional inheritance  Supertype

9. Subject-oriented programming  A subject can associate state and behavior with an object identifier as required by that subject  Association of property  Separation of concerns along hyperplanes

10. Aspect-oriented programming  AOP is about explicitly slicing programs according to the various aspects they address  AOP weavers  Post-deployment weaving

11. XML Components  XML world is mostly declarative in nature  Still be necessary to establish an appropriate component concept  XML web services

12. Gamut of markets Chapter twenty-five of: Szyperski, Clemens et al. Component Software - Beyond Object-Oriented Programming. Second Edition

13. Contents  Component platforms and infrastructure  Tools  Professional Services

14. Component platforms and infrastructure  The value of component platforms and infrastructure can exceed that of used components  Approaches to reduce the cost of component construction

15. Component design and implementation tools  Rests on environmental specifications  Should use RAD methods  Use the same environment to prototype a component and implente the component  Support for the construction of models and supporting futher metadata

16. Component testing tools  Testing of components is the single most demanding aspect of component technology  Systematic aproach to testing are needed  Advisable strategies

17. Component assembly tools  Assembly needs to be automated  Differences from hardware assembly

18. Component system diagnosis and maintenance  Related to component testing  Diagnosis is tricky because systems consist of components from many different vendors  Diagnosis tools and ways of operation  Requirements of maintenance

19. Component system and framework architects  These tasks are extremely demanding  Independent architecture firms can concentrate the expertise  Few clients X Open markets

20. Component assembly consultants  Component assembly is supposedly simple…  Component specializing in assembly of components can find a broad market  COTS (commercial off the shelf)  Act knowing well the potential and limitations of products and helping gauge the risks and benefits

21. Component configuration management  Outsourcing  Monitoring of component markets  Development of gradual migration plans and the integration  Migration from monolithic solutions to component-based ones

22. Component warehouses, marketing, and consulting  Traditional aspects…  All activities are likely to be fully electronic  Legal and practical protection offered by physical package becomes unnecessary

23. Component operators, web services, application service providers  Component paired with a service provider forms a marketplace service  Business model will be concentrated in provisioning service combined with availability and help desk services

24. Any question?