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service.go
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service.go
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package localcache
import (
"errors"
"github.com/importcjj/localcache/log"
"os"
"time"
)
// ErrServiceClosed ...
var ErrServiceClosed = errors.New("cache service closed")
// Service ...
type Service struct {
*Options
getters map[string]*getter
getEventsQ chan *getEvent
getEventFinishedQ chan *event
getPendingGroups map[string]*requestGroup
updateEventQ chan *event
updateEventFinishQ chan *event
updatePendingGroups map[string]*requestGroup
Logger *log.Logger
closeQ chan struct{}
running bool
}
// NewService returns a new cache service.
func NewService(opts *Options) *Service {
options := newDefaultOptions()
options.merge(opts)
logger := log.New(os.Stderr)
serv := &Service{
Options: options,
getters: make(map[string]*getter),
getEventsQ: make(chan *getEvent, 100000),
getEventFinishedQ: make(chan *event, 1000),
getPendingGroups: make(map[string]*requestGroup),
updateEventQ: make(chan *event, 1000),
updateEventFinishQ: make(chan *event, 1000),
updatePendingGroups: make(map[string]*requestGroup),
Logger: logger,
closeQ: make(chan struct{}),
}
go serv.loop()
return serv
}
func (serv *Service) loop() {
for {
select {
case getEvent := <-serv.getEventsQ:
serv.startGetEvent(getEvent)
case getfinish := <-serv.getEventFinishedQ:
serv.finishGetEvent(getfinish)
case update := <-serv.updateEventQ:
serv.startUpdateEvent(update)
case updateFinish := <-serv.updateEventFinishQ:
serv.finishUpdateEvent(updateFinish)
case <-serv.closeQ:
return
}
}
}
// Close ...
func (serv *Service) Close() {
close(serv.closeQ)
}
func (serv *Service) registerUpdateEvent(key RequestKey) {
serv.Logger.Debug("register update event")
serv.updateEventQ <- &event{Key: key}
}
func (serv *Service) registerGetEvent(evt *getEvent) {
select {
case <-serv.closeQ:
close(evt.request)
case serv.getEventsQ <- evt:
}
}
func (serv *Service) timeoutUpdateEvent(key RequestKey) {
serv.updateEventFinishQ <- &event{Key: key, Kind: EvtKindTimeout}
}
func (serv *Service) registerUpdateTimeout(key RequestKey, dur time.Duration) *time.Timer {
return time.AfterFunc(dur, func() {
serv.updateEventFinishQ <- &event{Key: key, Kind: EvtKindTimeout}
})
}
func (serv *Service) startUpdateEvent(evt *event) {
serv.Logger.Debug("start update event")
getter, ok := serv.getters[evt.Key.GetGetterName()]
if !ok {
return
}
_, ok = serv.updatePendingGroups[evt.Key.GetCacheName()]
if ok {
return
}
rg := newRequestGroup()
serv.updatePendingGroups[evt.Key.GetCacheName()] = rg
go rg.handleUpdate(serv, evt.Key, getter)
}
func (serv *Service) finishUpdateEvent(evt *event) {
rg, ok := serv.updatePendingGroups[evt.Key.GetCacheName()]
if !ok {
panic("update requests group not found")
}
switch evt.Kind {
case EvtKindTimeout:
rg.Timeout()
default:
rg.Finish()
}
delete(serv.updatePendingGroups, evt.Key.GetCacheName())
}
// registerGetTimeout ...
func (serv *Service) registerGetTimeout(key RequestKey, dur time.Duration) *time.Timer {
return time.AfterFunc(dur, func() {
serv.getEventFinishedQ <- &event{Key: key, Kind: EvtKindTimeout}
})
}
func (serv *Service) finishGetEvent(evt *event) {
rg, ok := serv.getPendingGroups[evt.Key.GetCacheName()]
if !ok {
panic("get requests group not found")
}
switch evt.Kind {
case EvtKindTimeout:
rg.Timeout()
default:
rg.Finish()
}
delete(serv.getPendingGroups, evt.Key.GetCacheName())
}
func (serv *Service) startGetEvent(evt *getEvent) {
group, ok := serv.getPendingGroups[evt.Key.GetCacheName()]
if !ok {
group = newRequestGroup()
serv.getPendingGroups[evt.Key.GetCacheName()] = group
go group.HandleGet(serv, evt.Key)
}
evt.request <- group
}
// Register ...
func (serv *Service) Register(key string, expire time.Duration, getterFunc GetterFunc) error {
serv.getters[key] = &getter{
Func: getterFunc,
Expire: expire,
}
return nil
}
// Get Cache by key
func (serv *Service) Get(key RequestKey) Cache {
evt := &getEvent{Key: key, request: make(chan *requestGroup)}
serv.registerGetEvent(evt)
req, ok := <-evt.request
if !ok {
goto serviceClosed
}
select {
case <-serv.closeQ:
goto serviceClosed
case <-req.closeQ:
return req.Cache()
}
serviceClosed:
cache := newCacheWrapper()
cache.setError(ErrServiceClosed)
return cache
}