Pavas.Patterns.Context

Pavas.Patterns.Context is a .NET library for managing context constructors and accessors (providers). It provides a flexible and extensible way to create, manage, and access contexts in your applications. This library is designed with dependency injection in mind, making it easy to integrate into existing projects.

Installation

To install this library, add the following NuGet package to your project:

dotnet add package Pavas.Patterns.Context

Usage

1. Define Context Class

Create a context class that will be managed by the context provider and factory. This class should contain any information relevant to the context you want to manage.

public class MyContext { public string UserId { get; set; } public string TenantId { get; set; } public string CorrelationId { get; set; } public MyContext(string userId, string tenantId, string correlationId) { UserId = userId; TenantId = tenantId; CorrelationId = correlationId; } }

2. Register the Context in Dependency Injection

In your Startup.cs or wherever you configure your services, register the context using the provided extension method.

Use the ServiceLifetime enum to assign the injection type.

For Scoped Context:

public void ConfigureServices(IServiceCollection services) { services.AddScopedContext<MyContext>(); }

For Transient Context:

public void ConfigureServices(IServiceCollection services) { services.AddTransientContext<MyContext>(); }

For Singleton Context:

public void ConfigureServices(IServiceCollection services) { var myContext = new MyContext("user-123", "tenant-456", "correlation-789"); services.AddSingletonContext(myContext); }

Or with an initializer:

public void ConfigureServices(IServiceCollection services) { services.AddSingletonContext(provider => { return new MyContext("user-123", "tenant-456", "correlation-789"); }); }

3. Create and Use Contexts

Use the IContextFactory<TContext> to create (construct) and destroy (destruct) contexts within your application. The IContextProvider<TContext> will allow you to access the current context.

Constructing a Context

public class SomeService { private readonly IContextFactory<MyContext> _contextFactory; public SomeService(IContextFactory<MyContext> contextFactory) { _contextFactory = contextFactory; } public void CreateContext() { var context = new MyContext("user-123", "tenant-456", "correlation-456"); _contextFactory.Construct(context); } }

Accessing the Context

public class AnotherService { private readonly IContextProvider<MyContext> _contextProvider; public AnotherService(IContextProvider<MyContext> contextProvider) { _contextProvider = contextProvider; } public void DoSomethingWithContext() { var context = _contextProvider.Context; Console.WriteLine($"UserId: {context.UserId}, TenantId: {context.TenantId}, CorrelationId: {context.CorrelationId}"); } }

Destroying a Context

public class CleanupService { private readonly IContextFactory<MyContext> _contextFactory; public CleanupService(IContextFactory<MyContext> contextFactory) { _contextFactory = contextFactory; } public void Cleanup() { _contextFactory.Destruct(); } }

Project Structure

The library is organized into several key components:

• AsyncLocalContextProvider<TContext>: Manages the current instance of the context for the current async execution context.
• GlobalContextProvider<TContext>: Manages a global or singleton instance of the context.
• ContextFactory<TContext>: Provides methods to create (construct) and destroy (destruct) contexts.
• Extensions: Contains methods for registering the context provider and factory with the dependency injection container.

Contributing

Contributions to this library are welcome. Feel free to open issues or submit pull requests.

License

This project is licensed under the MIT License.