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package todo
import (
"sync"
)
type Service interface {
Get(owner string) []Item
Save(owner string, newItems []Item) error
}
type MemoryService struct {
// key = session id, value the list of todo items that this session id has.
items map[string][]Item
// protected by locker for concurrent access.
mu sync.RWMutex
}
func NewMemoryService() *MemoryService {
return &MemoryService{
items: make(map[string][]Item, 0),
}
}
func (s *MemoryService) Get(sessionOwner string) []Item {
s.mu.RLock()
items := s.items[sessionOwner]
s.mu.RUnlock()
return items
}
func (s *MemoryService) Save(sessionOwner string, newItems []Item) error {
var prevID int64
for i := range newItems {
if newItems[i].ID == 0 {
newItems[i].ID = prevID
prevID++
}
}
s.mu.Lock()
s.items[sessionOwner] = newItems
s.mu.Unlock()
return nil
}
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