Software Design Patterns Questions Long
The Template Method design pattern is a behavioral design pattern that defines the skeleton of an algorithm in a superclass, allowing subclasses to provide specific implementations for certain steps of the algorithm. It promotes code reuse and provides a way to define a common structure for a group of related algorithms.
In the Template Method pattern, the algorithm is divided into a series of steps, where each step is represented by a method. The superclass contains the template method, which defines the overall algorithm structure by calling these methods in a specific order. Some of these methods are implemented in the superclass, while others are left abstract, allowing subclasses to provide their own implementations.
A real-world scenario where the Template Method pattern can be applied is in the development of a web framework. Consider a scenario where you are developing a web framework that allows developers to create web applications. The framework needs to provide a common structure for handling HTTP requests and responses, but the specific implementation details may vary depending on the application.
In this case, you can define a base class called "WebApplication" that contains the template method called "handleRequest". This method represents the overall algorithm for handling an HTTP request. It can be divided into steps such as parsing the request, validating the request, processing the request, and generating the response.
The "handleRequest" method in the "WebApplication" class can call other methods such as "parseRequest", "validateRequest", "processRequest", and "generateResponse". Some of these methods can be implemented in the base class with default behavior, while others can be left abstract, allowing subclasses to provide their own implementations.
For example, a subclass called "BlogApplication" can extend the "WebApplication" class and provide its own implementation for the "processRequest" method to handle blog-specific logic. Another subclass called "EcommerceApplication" can also extend the "WebApplication" class and provide its own implementation for the "processRequest" method to handle e-commerce-specific logic.
By using the Template Method pattern in this scenario, the web framework provides a common structure for handling HTTP requests and responses, while allowing developers to customize the behavior for specific types of applications. This promotes code reuse, reduces duplication, and provides a flexible way to handle different types of web applications within the same framework.