Understanding Resolvers in Angular

When building Angular applications, one of the common requirements is to fetch data before navigating to a route. For instance, consider a scenario where you want to display a user's details on a profile page. Instead of loading the route and showing a spinner while fetching data, wouldn't it be better to resolve the data before entering the route? This is where Angular Resolvers shine.

In this post, we'll explore what resolvers are, why they're essential, and how to use them effectively in your Angular applications

What is a Resolver in Angular?

A Resolver in Angular is a service that retrieves data before a route is activated. It ensures that your component is rendered with the required data already available, improving user experience by reducing the time spent waiting for asynchronous calls after the view is loaded.

Resolvers are part of Angular's Route Guards, which include CanActivate, CanDeactivate, CanLoad, and others. While these guards determine route activation, Resolvers focus specifically on fetching data.

Why Use Resolvers?

1. Optimized User Experience: By fetching data before rendering, you avoid rendering incomplete views with loading indicators.

Understanding ClaimsPrincipal, ClaimsIdentity, and Claim in C#

When developing applications that require user authentication and authorization, managing user identities and their associated information securely is essential. In C#, the classes ClaimsPrincipal, ClaimsIdentity, and Claim in the System.Security.Claims namespace provide a flexible and extensible way to manage user identity data in a claims-based manner.

In this post, we'll explore the concepts of ClaimsPrincipal, ClaimsIdentity, and Claim in C#, and see how they work together to represent and manage user identity information.

Understanding Claims-Based Identity

Before diving into the classes, it’s helpful to understand the concept of claims-based identity. A claim is a statement about a user that provides information about who they are, what they can do, or other relevant attributes. Examples of claims include:

• The user's email address
• A role or permission level (like "Admin" or "User")
• The user's age or country of residence

Exploring HybridCache in .Net 9

As ASP.NET Core continues to evolve, with the release of .NET 9, a new caching mechanism called HybridCache has been introduced, offering a blend of in-memory and distributed caching to address the limitations of traditional caching methods.

What is HybridCache?

HybridCache is a caching library designed to combine the best features of in-memory caching (L1) and distributed caching (L2). This dual-layer approach helps mitigate common issues like cache stampedes and race conditions, ensuring a more robust and efficient caching strategy.

Key Features of HybridCache

• Stampede Protection: Prevents multiple concurrent requests from overwhelming the cache by ensuring only one request fetches the data while others wait for the result.

Polly in .NET Core: A Guide to Resilience and Fault Handling

Polly is a .NET library that provides a framework for handling transient faults in an application. It allows developers to implement retry policies, circuit breakers, timeouts, and other fault-handling patterns in a clean, composable, and declarative way. In this post, we'll explore what Polly is, why it’s valuable, and how to use it in .NET Core applications to build resilient, fault-tolerant solutions.

What is Polly?

Polly is an open-source library that enables you to build fault-handling and resilience logic into your applications. It helps you manage faults and unexpected scenarios by providing a range of resilience policies. Polly works seamlessly with .NET Core and can be used across HTTP clients, database calls, message queues, and more. Here are the key policies Polly supports:

• Retry: Retry a failed operation multiple times before giving up.
• Circuit Breaker: Stop calling a failing service temporarily to give it time to recover.
• Timeout: Fail if an operation takes longer than a specified time.
• Fallback: Provide an alternative response or behavior when an operation fails.
• Bulkhead Isolation: Limit concurrent executions to avoid resource exhaustion.
• Cache: Cache responses to avoid repeated calls for the same result.

By combining these policies, Polly enables you to create robust and customizable resilience strategies tailored to your application’s needs.

Why Use Polly?

In any distributed application, you’ll inevitably encounter issues like network instability, service unavailability, or rate limiting. Polly allows you to handle these scenarios without excessive code and helps:

Implementing JWT Authentication in .NET Core

JWT (JSON Web Token) is a popular way to implement secure authentication in modern web applications. It provides a lightweight and stateless mechanism to authenticate users, ensuring secure data transfer. In this blog post, we’ll explore how to implement JWT authentication in a C# ASP.NET Core application with a step-by-step example.

What is JWT?

A JWT is a token that is used to securely transmit information between two parties (client and server). It is digitally signed, ensuring that the data it contains can be trusted. JWT consists of three parts:

1. Header: Specifies the algorithm used to generate the signature, typically HMAC SHA256 or RSA.
2. Payload: Contains the claims or the data being transmitted (such as user ID, roles, etc.).
3. Signature: Ensures that the token hasn’t been tampered with.

The general structure looks like this:

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1bmlxdWVfbmFtZSI6InVzZXIwMSIsIm5iZiI6MTczMTIxMDQ4OCwiZXhwIjoxNzMxMjExNjg4LCJpYXQiOjE3MzEyMTA0ODh9.2adOgvFCgF4FfzwWS3VbT-AOUvXvwwMmI76HrdTXFW4

Why JWT?

• Stateless: No need to store sessions on the server.
• Scalable: The server doesn’t need to store or retrieve session information.
• Cross-domain: JWT can be easily used across different domains, making it ideal for distributed applications like microservices.