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Ada 2005 By Demis Harper

Ada 2005 By Demis Harper. Review. Created for use by Department of Defense Supports Object Oriented Programming Handles Multitasking Interoperable. Creating Objects. Type shape is tagged Record Area:float; End record; Type Circle is new shape with Record radius:float; end record;.

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Ada 2005 By Demis Harper

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  1. Ada 2005 By Demis Harper

  2. Review • Created for use by Department of Defense • Supports Object Oriented Programming • Handles Multitasking • Interoperable

  3. Creating Objects • Type shape is tagged Record Area:float; End record; • Type Circle is new shape with Record radius:float; end record;

  4. Creating Objects • Example Declaration Circ:Circle; sh:shape; • Example assignments. circ.radius:=0.5; Circ:=(radius=>0.5); Circ:=(area=>0.7853,radius=>0.5); sh.area:=0.7853; Circ:=(sh with radius=>0.5);

  5. multitasking • Protected Objects • Represent shared resources • (Object).acquire • Gets object for use • (Object).release • Object becomes available to other calls

  6. Multitasking- Protected Objects • Protected Functions • Read only • Subject to read lock • Multiple function calls allowed on single object • Cannot change attribute values • Protected procedure • Subject to write lock • One procedure at a time • Can change attribute values

  7. Multitasking • Re-queuing • Java-esque method to allows task to suspend itself. • Multitasking generally similar to Java Threading • Safer

  8. Interoperability • Supports interfaces similar to Java and C# • Uses Object.Operation notation • “Unchecked Union” for inter-operating with C languages • Use of “limited with” to enforce dependence between types in different packages

  9. References • Barbey, S., Kempe, M., & Strohmeier, A. (1993). Object-Oriented Programming with Ada 9X. Ada Home: the Home of the Brave Ada Programmers (HBAP). Retrieved November 26, 2012, from http://www.adahome.com/9X/OOP-Ada9X.html • Sanden, B. (2006). Intuitive Multitasking in Ada 2005. CrossTalk Magazine - The Journal of Defense Software Engineering - Home. Retrieved from http://www.crosstalkonline.org/storage/issue-archives/2006/200608/200608-Sandn.pdf • Taft, T. (2004, October). Ada 2005: Putting It All Together. adapower.com. Retrieved from http://www.adapower.com/files/articles/adagermany2004rev3.pdf

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