Lesson plan
Active object
The active object design pattern decouples method execution from method invocation for objects that each reside in their own thread of control. The goal is to introduce concurrency, by using asynchronous method invocation and a scheduler for handling requests. The pattern consists of six elements: * A proxy, which provides an interface towards clients with publicly accessible methods. * An interface which defines the method request on an active object. * A list of pending requests from clients. * A scheduler, which decides which request to execute next. * The implementation of the active object method. * A callback or variable for the client to receive the result.
Article summary
The active object design pattern decouples method execution from method invocation for objects that each reside in their own thread of control. The goal is to introduce concurrency, by using asynchronous method invocation and a scheduler for handling requests. The pattern consists of six elements: * A proxy, which provides an interface towards clients with publicly accessible methods. * An interface which defines the method request on an active object. * A list of pending requests from clients. * A scheduler, which decides which request to execute next. * The implementation of the active object method. * A callback or variable for the client to receive the result.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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