Stateful vs Stateless Architecture PDF

219 Stateful vs Stateless Architecture ** Stateful and Stateless architectures are two approaches to managing user ** ** ** *...

219 Stateful vs Stateless Architecture ** Stateful and Stateless architectures are two approaches to managing user ** ** ** * ** information and data processing in software applications, particularly in web *** * services and APIs. * ** Stateful Architecture ** ** Definition: In a stateful architecture, the server retains information (or state) ** ** ** * about the client's session. * This state is used to remember previous interactions and respond accordingly in * * * future interactions. * ** Characteristics: ** ** Session Memory: The server remembers past session data, which ** * * influences its responses to future requests. * * ** Dependency on Context: The response to a request can depend on ** * previous interactions. * ** Example: An online banking application is a typical example of a stateful ** *** *** ** ** application. * Once you log in, the server maintains your session data (like authentication, * *** *** *** *** your interactions). *** *** This data influences how the server responds to your subsequent actions, *** *** such as displaying your account balance or transaction history. ** Pros: ** ** Personalized Interaction: Enables more personalized user experiences ** *  ! ❗ based on previous interactions. * ** Easier to Manage Continuous Transactions: Convenient for ** * transactions that require multiple steps. * ** Cons: ** ** Resource Intensive: Maintaining state can consume more server ** * resources. * ** Scalability Challenges: Scaling a stateful application can be more ** ** ** * complex due to session data dependencies. * *** Stateless Architecture * ** ** Definition: In a stateless architecture, each request from the client to the ** ** ** *** server must contain all the information needed to understand and complete the request. The server doesn't rely on information from previous interactions. *** * * ** Characteristics: ** *** No Session Memory: The server does not store any state about the client’s * ~~ ~~** ~~ ~~ session. *** Self-contained Requests: Each request is independent and must include all * ** * necessary data. * ** Example: RESTful APIs are a classic example of stateless architecture. ** *** *** ** ** Each HTTP request to a RESTful API contains all the information the server needs to process it (like user authentication, required data), and the response *** *** to each request doesn't depend on past requests. ~~ ~~ ** Pros: ** ** Simplicity and Scalability: Easier to scale as there is no need to ** * maintain session state. ~~ ~~ * ** Predictability: Each request is processed independently, making the ** * * * system more predictable and easier to debug. *  ❗ ** Cons: ** ** Redundancy: Can lead to redundancy in data sent with each request. ** ** Potentially More Complex Requests: Clients may need to handle more ** complexities in preparing requests. ** Key Differences ** ** Session Memory: ** ** Stateful retains user session information, influencing future interactions, ** * * * * * whereas stateless treats each request as an isolated transaction, * ** ** * * * independent of previous requests. * ** Server Design: ** ** Stateful servers maintain state, making them more complex and resource- ** * * * * * intensive. * ** Stateless servers are simpler and more scalable. ** * * * * ** Use Cases: ** ** Stateful is suitable for applications requiring continuous user interactions ** * and personalization. * ** Stateless is ideal for services where each request can be processed ** * independently, like many web APIs. * ** Conclusion ** ** Stateful and stateless architectures offer different approaches to handling user ** ** ** * sessions and data processing. The choice between them depends on the specific * requirements of the application, such as the need for personalization, resource availability, and scalability. ** Stateful provides a more personalized user experience but at the cost of higher ** * ** ** ** complexity and resource usage, ** ** ** * * while stateless offers simplicity and scalability, suitable for distributed systems * ** ** * * * * *** ** where each request is independent. *