Kessoku

Kessoku is a next-generation compile-time dependency injection (DI) library designed specifically for Go applications. It stands out by enabling parallel dependency injection, which significantly reduces application startup time, especially when dealing with multiple independent services. Traditional DI frameworks, such as google/wire, initialize services in a sequential manner, potentially leading to increased waiting times during application restarts. In contrast, Kessoku executes independent providers simultaneously, allowing for faster service initialization.

Key Features

• Parallel Execution: Independent services can be initialized at the same time, minimizing total startup time. For example:

  // Sequential (google/wire) 
  wire.Build(NewDB, NewCache, NewAuth, NewApp) // Each waits for the previous
  
  // Parallel (Kessoku)
  kessoku.Inject[*App](https://github.com/mazrean/kessoku/blob/main/"InitApp",
      kessoku.Async(kessoku.Provide(NewDB)),
      kessoku.Async(kessoku.Provide(NewCache)),
      kessoku.Async(kessoku.Provide(NewAuth)),
      kessoku.Provide(NewApp),
  ) // Starts as fast as possible
  

• Efficiency: Experience faster application restarts, especially beneficial for environments where frequent restarts are commonplace, such as during development or in serverless architectures.

Advantages Over Alternatives

Kessoku presents several strengths when compared to other DI frameworks:

Feature	Kessoku	google/wire	uber/fx
Startup Speed	Parallel	Sequential	Sequential + runtime
Learning Curve	Minimal	Minimal	Steep
Production Ready	Yes	Yes	Yes

Ideal Use Cases: Kessoku is particularly useful for:

• Applications with multiple slow-starting services (e.g., databases, caches, external APIs).
• Development environments where frequent application restarts occur, saving precious time during testing and iterations.
• Users of google/wire who appreciate compile-time dependency injection but find the startup times unacceptable.

Getting Started

Kessoku's straightforward API allows developers to seamlessly integrate it into their Go projects, using simple code constructs to create efficient dependency graphs. Full documentation and API references can be found at pkg.go.dev/github.com/mazrean/kessoku.

Discover how Kessoku can streamline service initialization and enhance your Go application performance.