package shared

import (
	"sync"

	"github.com/matrix-org/dendrite/syncapi/types"
)

type StreamProvider struct {
	DB          *Database
	latest      types.StreamPosition
	latestMutex sync.RWMutex
	update      *sync.Cond
}

func (p *StreamProvider) StreamSetup() {
	locker := &sync.Mutex{}
	p.update = sync.NewCond(locker)
}

func (p *StreamProvider) StreamAdvance(
	latest types.StreamPosition,
) {
	p.latestMutex.Lock()
	defer p.latestMutex.Unlock()

	if latest > p.latest {
		p.latest = latest
		p.update.Broadcast()
	}
}