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Java Message Service (JMS) uses Observer design pattern along with Mediator pattern to allow applications to subscribe and publish data to other applications. Model-View-Controller (MVC) frameworks also use Observer pattern where Model is the Subject and Views are observers that can register to get notified of any change to the model.What is the difference between observer and pub-sub pattern?
There are two major differences between Observer pattern and Pub-Sub pattern: Observer pattern is mostly implemented in a synchronous way, i.e. the observable calls the appropriate method of all its observers when some event occurs. The Pub-Sub pattern is mostly implemented in an asynchronous way (using message queue).What is observable pattern?
Observer pattern. The observer pattern is a software design pattern in which an object, called the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods. It is mainly used to implement distributed event handling systems.