Puddle is a tiny generic resource pool library for Go that uses the standard context library to signal cancellation of acquires. It is designed to contain the minimum functionality required for a resource pool. It can be used directly or it can be used as the base for a domain specific resource pool. For example, a database connection pool may use puddle internally and implement health checks and keep-alive behavior without needing to implement any concurrent code of its own.

Features

Acquire cancellation via context standard library
Statistics API for monitoring pool pressure
No dependencies outside of standard library
High performance
100% test coverage

Example Usage

constructor := func(context.Context) (interface{}, error) {
  return net.Dial("tcp", "127.0.0.1:8080")
}
destructor := func(value interface{}) {
  value.(net.Conn).Close()
}
maxPoolSize := 10

pool := puddle.NewPool(constructor, destructor, maxPoolSize)

// Acquire resource from the pool.
res, err := pool.Acquire(context.Background())
if err != nil {
  // ...
}

// Use resource.
_, err = res.Value().(net.Conn).Write([]byte{1})
if err != nil {
  // ...
}

// Release when done.
res.Release()

License

MIT