slack/messageID.go at master · adeebahmed/slack

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package slack

import "sync/atomic"

// IDGenerator provides an interface for generating integer ID values.

type IDGenerator interface {

Next() int

}

// NewSafeID returns a new instance of an IDGenerator which is safe for

// concurrent use by multiple goroutines.

func NewSafeID(startID int) IDGenerator {

return &safeID{

nextID: int64(startID),

}

type safeID struct {

nextID int64

}

// make sure safeID implements the IDGenerator interface.

var _ IDGenerator = (*safeID)(nil)

// Next implements IDGenerator.Next.

func (s *safeID) Next() int {

id := atomic.AddInt64(&s.nextID, 1)

return int(id)

}