// GetTrains searches the embedded cache for a result otherwise deletates the request to the underlying
// facade.
func (c *cachingfacade) GetTrains(key string, value string) (chan *models.TrainEventList, chan error) {
logger.Printf("Intercepting request for GetTrains(%s, %s)", key, value)
cacheKey := toCacheKey("GetTrains", key, value)
success, failure := make(chan *models.TrainEventList), make(chan error)
go func() {
if cachedItem, found := c.localcache.Get(cacheKey); found {
v := cachedItem.(*trainCacheEntry)
if v.err != nil {
failure <- v.err
} else {
success <- v.list
}
} else {
privSuccess, privFailure := c.facade.GetTrains(key, value)
select {
case result := <-privSuccess:
success <- c.cacheSuccess(cacheKey, result)
case err := <-privFailure:
failure <- c.cacheFalure(cacheKey, err)
case <-time.After(time.Second * 30):
failure <- services.NewServiceTimeoutError("Failed to get all trains in time")
}
}
}()
return success, failure
}
func (s *trainService) TrainsByKeyValue(key string, value string) (result *models.TrainEventList, err error) {
successChan, errChan := s.remoteAPI.GetTrains(key, value)
select {
case result := <-successChan:
return s.joinStationName(result), nil
case err = <-errChan:
return nil, err
case <-time.After(time.Second * 30):
return nil, services.NewServiceTimeoutError("Failed to get all trains in time")
}
}
func (c *cachingfacade) GetStation(stationid string) (chan *models.StationList, chan error) {
success, failure := make(chan *models.StationList), make(chan error)
go func() {
if stationByIDMap[stationid] == nil {
downstreamSucces, downstreamFailure := c.facade.GetStation(stationid)
select {
case result := <-downstreamSucces:
stationByIDMap[stationid] = result
case err := <-downstreamFailure:
failure <- err
case <-time.After(time.Second * 30):
failure <- services.NewServiceTimeoutError("Failed to get all trains in time")
}
}
success <- stationByIDMap[stationid]
}()
return success, failure
}
func (c *cachingfacade) GetStations() (chan *models.StationList, chan error) {
//logger.Println("Intercepting request for GetStatins()")
success, failure := make(chan *models.StationList), make(chan error)
go func() {
if cachedStationList == nil {
logger.Println("Sending request downstream")
downstreamSuccess, downstreamErr := c.facade.GetStations()
select {
case cachedStationList = <-downstreamSuccess:
case err := <-downstreamErr:
failure <- err
case <-time.After(time.Second * 30):
failure <- services.NewServiceTimeoutError("Failed to get all trains in time")
}
}
success <- cachedStationList
}()
return success, failure
}
