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package object
import (
"citrons.xyz/talk/proto"
)
type ObjCache struct {
stream ObjStream
objects map[string]cacheEntry
}
type cacheEntry struct {
o proto.Object
refCount int
cached bool
}
type ObjStream interface {
Sub(id string)
GetInfo(id string, callback func(*proto.Object))
Unsub(id string)
}
func NewCache(stream ObjStream) ObjCache {
return ObjCache {stream, make(map[string]cacheEntry)}
}
func (oc *ObjCache) Get(id string) *proto.Object {
entry := oc.objects[id]
if !entry.cached {
return nil
}
return &entry.o
}
func (oc *ObjCache) Fetch(id string, callback func(*proto.Object)) {
entry := oc.objects[id]
if !entry.cached {
oc.stream.GetInfo(id, callback)
} else {
callback(&entry.o)
}
}
func (oc *ObjCache) Watch(id string) {
entry, ok := oc.objects[id]
if !ok {
oc.stream.Sub(id)
}
entry.refCount++
oc.objects[id] = entry
}
func (oc *ObjCache) Unwatch(id string) {
entry, ok := oc.objects[id]
if ok {
entry.refCount--
if entry.refCount <= 0 {
oc.stream.Unsub(id)
delete(oc.objects, id)
} else {
oc.objects[id] = entry
}
}
}
func (oc *ObjCache) IsWatched(id string) bool {
return oc.objects[id].refCount > 0
}
func (oc *ObjCache) Update(id string, new proto.Object) {
entry := oc.objects[id]
if entry.cached && new.Kind == entry.o.Kind {
for k, v := range new.Fields {
entry.o.Fields[k] = v
}
} else {
entry.o = new
}
entry.cached = true
oc.objects[id] = entry
}
func (oc *ObjCache) Gone(id string) {
entry := oc.objects[id]
if entry.cached {
obj := entry.o
obj.Fields["kind"] = obj.Kind
obj.Kind = "gone"
entry.o = obj
oc.objects[id] = entry
}
}
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