What is the Memento Design Pattern?

What is the Memento Design Pattern?

The Memento design pattern is a behavioral pattern that is used to capture and restore an object’s internal state without violating encapsulation. It allows you to save and restore the state of an object to a previous state, providing the ability to undo or roll back changes made to the object....

Components of Memento Design Pattern

1. Originator...

Communication between the components

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Real-World Analogy of Memento Design Pattern

Imagine you’re an artist painting a picture (Originator). You have a beautiful painting that you’ve been working on, and you want to make sure you can save its progress and go back to previous versions if needed....

Memento Design Pattern Example

Imagine you’re building a text editor application, and you want to implement an undo feature that allows users to revert changes made to a document. The challenge is to store the state of the document at various points in time and restore it when needed without exposing the internal implementation of the document....

When to use Memento Design Pattern

Undo functionality: When you need to implement an undo feature in your application that allows users to revert changes made to an object’s state.Snapshotting: When you need to save the state of an object at various points in time to support features like versioning or checkpoints.Transaction rollback: When you need to rollback changes to an object’s state in case of errors or exceptions, such as in database transactions.Caching: When you want to cache the state of an object to improve performance or reduce redundant computations....

When not to use Memento Design Pattern

Large object state: If the object’s state is large or complex, storing and managing multiple snapshots of its state can consume a significant amount of memory and processing resources.Frequent state changes: If the object’s state changes frequently and unpredictably, storing and managing snapshots of its state may become impractical or inefficient.Immutable objects: If the object’s state is immutable or easily reconstructible, there may be little benefit in using the Memento pattern to capture and restore its state.Overhead: Introducing the Memento pattern can add complexity to the codebase, especially if the application does not require features like undo functionality or state rollback....