Adapter Design Pattern

Adapter pattern is categorized under structural design pattern that adds a layer of abstraction between two incompatible components of an application to make them compatible.


Possible use cases for adapter pattern 

The Adapter pattern is used when you want to use an existing class but its interface is not compatible with the interface required by the client. The Adapter pattern allows you to create a wrapper class that implements the required interface and delegates the calls to the existing class. Here are some common use cases for the Adapter pattern:


1. Integrating legacy code 

The Adapter pattern is often used to integrate legacy code into a new system. If you have existing code that you want to reuse, but its interface is not compatible with your new system, you can create an Adapter class that adapts the old interface to the new one.


2. Interoperability 

The Adapter pattern can be used to allow two systems that have incompatible interfaces to communicate with each other. For example, if you have a third-party library that uses a different interface than your application, you can create an Adapter class that translates the calls between the two interfaces.


3. Supporting multiple interfaces 

Sometimes, you may want to provide multiple interfaces for the same class. For example, if you have a class that implements a specific interface, but you want to provide a more general interface for the same functionality, you can create an Adapter class that implements the more general interface and delegates the calls to the original class.


4. Simplifying complex interfaces 

The Adapter pattern can be used to simplify a complex interface by creating a wrapper class that provides a simpler interface. For example, if you have a class that has many methods and properties, you can create an Adapter class that exposes only the methods and properties that are relevant to the client.


Implementation 

Implementation of the adapter pattern include following steps 

1. Let's assume we have existing codebase to start with as shown below.




2. Now we have new third-party component to integrate with existing code but they are not compatible with each other.




 3. Add abstraction layer to make them compatible that include an abstraction class which implements existing interface with encapsulating the functionality of component method using it's class as shown below.




 4. Now in new codebase, we have existing functionality which also supports new component through the same existing interface via adapter class.



Compatibility issues can arise when the adapter and the adaptee have different interfaces. One way to handle these issues is to use a common interface or abstraction that both the adapter and adaptee implement. Another way is to use a mapping or translation layer to convert the data from one interface to another. It's important to carefully consider the compatibility issues when designing the Adapter pattern to ensure that the adapter and adaptee are able to work together seamlessly.

Advantages of adapter pattern 

Adapter pattern helps to improve reusability of old functionality.


How do you choose between class adapter and an object adapter?

The choice between a class adapter and an object adapter depends on the specific requirements of the project. Class adapters are best suited when you want to adapt an existing class and reuse its implementation but this can lead to tight coupling between the adapter and the adaptee. Object adapters are best suited when you want to adapt an existing class without modifying its interface, and when you want to be able to use multiple adapters with the same adaptee.

In the Adapter pattern, object composition is used to create an object adapter, while class inheritance is used to create a class adapter. Object composition is often preferred over class inheritance because it allows for greater flexibility and modularity.


What is two-way and one-way adapter in the Adapter pattern?

A two-way adapter is an adapter that can convert data in both directions between the client and the adaptee. This means that it can adapt the interface of the adaptee to the client's interface and vice versa. A one-way adapter, on the other hand, can only convert data in one direction. It can either adapt the interface of the adaptee to the client's interface or vice versa, but not both.








Comments

Post a Comment

Popular posts from this blog

Design Patterns

Image
Design patterns are a collection of reusable solutions to complex design problems in software development which evolved over time and widely accepted as the best way to address certain design challenges. They're more suitable when building an application prototype or working on large and complex projects. Design patterns are classified into three categories based on the type of problem they can solve  1. Creational design patterns  2. Structural  design patterns  3. Behavioral design patterns  Creational design patterns Creational design patterns are a type of design pattern that focus on creating objects in a way that is flexible, reusable, and efficient. These patterns provide a set of guidelines for creating objects and managing their lifecycle, helping to ensure that objects are created and used in a consistent and effective way.  Some most common examples of creation design patterns are  1.  Singleton pattern 2. Factory pattern 3. Abstra...
Read more

Abstract Factory Design Pattern

Abstract factory pattern is categorized under creational design pattern that focuses on families of related object creation without exposing its internal logic. In an abstract factory pattern, families of related objects are created without specifying their exact classes. It defines an interface for creating a set of related objects and allows different implementations of the factory to create different sets of related objects.  Possible use cases for abstract factory pattern  Here are some possible use cases for the Abstract Factory pattern 1. GUI Toolkits Abstract Factory pattern is frequently used in GUI toolkits, where different UI components like buttons, text boxes, and menus need to be created for different platforms such as Windows, Mac, or Linux. 2. Database Drivers Abstract Factory pattern can be used to create database drivers that support different databases like Oracle, MySQL, and SQL Server. The abstract factory can create a family of related objects like Co...
Read more

Azure Container Registry (ACR)

Image
Azure Container Registry (ACR) is a managed Docker registry service provided by Microsoft Azure. It is used to store and manage container images for use in Azure Kubernetes Service (AKS), Azure Web Apps, and other container-based services. ACR works by providing a secure and highly available repository for storing container images. It supports both public and private image repositories, which can be accessed by users with appropriate permissions. Users can push container images to the registry, and then pull them for use in their applications. How to Setup Azure Container Registry(ACR) To set up an Azure Container Registry (ACR), follow these steps 1. Log in to the Azure Portal (https://portal.azure.com/). 2. Click on the "+ Create a resource" button in the left-hand menu, and then search for "Container Registry" in the search box. 3. Click on "Container Registry" in the results and then click on the "Create" button. 4. In the "Basics" ...
Read more

Factory Design Pattern

Factory pattern is categorized under creational design pattern that focuses on object creation without exposing its internal logic. In factory pattern, objects are created without specifying its exact class. It defines an interface for creating objects, and allows subclasses to decide which class of object to create.  Possible use cases for factory pattern  Here are some possible use cases for the Factory pattern 1. Object creation with a common interface  If you need to create multiple objects that implement a common interface, a factory pattern can be used to abstract the creation of the objects. 2. Object creation with complex initialization  If object creation involves complex initialization, a factory pattern can be used to abstract the initialization process and make it simpler. 3. Object creation with conditional logic  If object creation requires conditional logic, a factory pattern can be used to encapsulate the logic in a factory method, making it easi...
Read more

What is Azure DevOps?

Azure DevOps is a set of practices that collaborate development(Dev) and operation(Ops) team to work closely along with the tools which are optimized for this collaboration aiming to increase the ability to develop applications faster than the traditional software development process.  DevOps lifecycle includes initial software planning, code, build, test, release phases, operations, ongoing monitoring, customer feedback and improvement.  Components of Azure DevOps  The main components of Azure DevOps are  1. Azure DevOps Boards 2. Azure DevOps Repository  3. Azure DevOps Pipeline  4. Azure DevOps Test Plans  5. Azure Artifacts Azure DevOps boards Azure board is one of the main component of azure DevOps that helps in managing the work for the project under development. Azure DevOps board main features are  Work Item  Its a defined unit of work along with some important attributes like the type of work, its severity, estimated time to com...
Read more