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package eventsource
import (
"sort"
"sync"
)
// Example repository that uses a slice as storage for past events.
type SliceRepository struct {
events map[string][]Event
lock sync.RWMutex
}
func NewSliceRepository() *SliceRepository {
return &SliceRepository{
events: make(map[string][]Event),
}
}
func (repo SliceRepository) indexOfEvent(channel, id string) int {
return sort.Search(len(repo.events[channel]), func(i int) bool {
return repo.events[channel][i].Id() >= id
})
}
func (repo SliceRepository) Replay(channel, id string) (out chan Event) {
out = make(chan Event)
go func() {
defer close(out)
repo.lock.RLock()
defer repo.lock.RUnlock()
events := repo.events[channel][repo.indexOfEvent(channel, id):]
for i := range events {
out <- events[i]
}
}()
return
}
func (repo *SliceRepository) Add(channel string, event Event) {
repo.lock.Lock()
defer repo.lock.Unlock()
i := repo.indexOfEvent(channel, event.Id())
if i < len(repo.events[channel]) && repo.events[channel][i].Id() == event.Id() {
repo.events[channel][i] = event
} else {
repo.events[channel] = append(repo.events[channel][:i], append([]Event{event}, repo.events[channel][i:]...)...)
}
return
}
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