go-interview-problems/05-costly-connections-with-unsafe-storage/task.go

package main

type Connection interface {
	// Need call Connect before Send
	// Take time to connect
	Connect()

	// Every connection should be disconnected after use
	// Take time to disconnect
	Disconnect()

	Send(req string) (string, error)
}

type ConnectionCreator interface {
	// Create new connection
	// Will return error if there is more than maxConn
	NewConnection() (Connection, error)
}

type Saver interface {
	// Saves data to unsafe storage
	// WILL CORRUPT DATA on concurrent save
	Save(data string)
}

// SendAndSave should send all requests concurrently using at most `maxConn` simultaneous connections.
// Responses must be saved using Saver.Save.
// Be careful: Saver.Save is not safe for concurrent use.
func SendAndSave(creator ConnectionCreator, saver Saver, requests []string, maxConn int) {
}