- Now let's talk about the publish/subscriber pattern…or simply, Pub/Sub.…It's one of the more unique patterns we'll cover…in this course in that it doesn't deal with the creation…of objects or modifying their behavior.…Instead it deals with sending and receiving commands…to those objects.…The problem here is simple.…When we build systems the components have to link…to one another.…The general way of doing this is hard coding connections…between the components.…A calls B, which calls C.…This all works out well until you need to add…components D and E.…You end up with more and more connections…which becomes impossible to manage.…
We need a way to auto wire these components…without explicitly wiring them.…Luckily there's a pattern for that, Pub/Sub.…The concept is simple.…You have some shared channel or communication bus…where publishers send their messages.…Then you have a series of subscribers that are listening…to that channel for messages they care about.…When they detect messages that fit their requirements,…
Author
Released
1/28/2015- Accessing data with the active record and table data gateway patterns
- Creating objects with the factory, singleton, and mock objects patterns
- Extending code with decorator and adapter patterns
- Structuring applications with MVC and Action-Domain-Responder patterns
Each chapter features a design pattern in a real-world coding scenario, and closes with a practice challenge to test your new skills.
Skill Level Intermediate
Duration
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Introduction
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Welcome51s
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1. The Active Record Pattern
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2. The Adapter Pattern
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3. The Decorator Pattern
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4. The Factory Pattern
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5. Mock Objects
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Introducing mock objects2m 18s
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6. The Model-View-Controller Pattern
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7. The Action-Domain-Response Pattern
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8. The Publish/Subscriber Pattern
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9. The Singleton Pattern
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10. The Strategy Pattern
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11. The Table Data Gateway Pattern
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Conclusion
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Next steps2m 8s
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Video: Introducing the publish/subscriber pattern