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observer design pattern

Shawmoon A answered on May 8, 2022 Popularity 10/10 Helpfulness 2/10

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  • observer design pattern

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    Popularity 10/10 Helpfulness 2/10 Language java
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    Contributed on May 08 2022
    Shawmoon A
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    Observer design pattern is useful when you are interested in the state of an object and want to get notified whenever there is any change.

     In observer pattern, the object that watch on the state of another object are called Observer and the object that is being watched is called Subject.

    https://www.digitalocean.com/community/tutorials/observer-design-pattern-in-java

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    Anjali Sharma
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    Observer design pattern, there is a Subject that maintains the list

    of Observers that are waiting for any update on the Subject. Once

    there is an update in Subject it notifies all the observers for the

    change.

    E.g. In real life, students are waiting for the result of their test. Here

    students are the observers and test is the subject. Once the result of

    test is known, testing organization notifies all the students about

    their result.

    The most popular use of Observer pattern is in Model View

    Controller (MVC) architectural pattern.

    Main issue with Observer pattern is that it can cause memory leaks.

    The subject holds a strong reference to observers. If observers are

    not de-registered in time, it can lead to memory leak.

    https://refactoring.guru/design-patterns/observer/java/example#:~:text=Observer%20is%20a%20behavioral%20design,that%20implements%20a%20subscriber%20interface.

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