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poller.go
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poller.go
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package poller
import (
"log"
"time"
)
type ticker interface {
Tick() <-chan time.Time
Stop()
}
type pollTicker struct {
*time.Ticker
}
func (t *pollTicker) Tick() <-chan time.Time { return t.C }
func (t *pollTicker) Stop() { t.Ticker.Stop() }
type poller struct {
ticker ticker
cycler cycler
}
// Creates a poller used to trigger the Cycler at specified interval.
func NewPoller(d time.Duration, pollDir PolledDirectory, listeners []Receiver) *poller {
return NewPollerWithFilters(d, pollDir, listeners, nil)
}
// Creates a poller used to trigger the Cycler at specified interval.
func NewPollerWithFilters(d time.Duration, pollDir PolledDirectory, listeners []Receiver, filters []Filter) *poller {
if len(filters) == 0 && cap(filters) == 0 {
filters = []Filter{
defaultFilter{},
}
}
cycler := pollCycle{
firstRun: true,
polledDirectory: pollDir,
cachedElements: make(chan map[string]Element, 1),
em: &eventTriggerManager{
receivers: listeners,
filters: filters,
},
}
return &poller{ticker: &pollTicker{time.NewTicker(d)},
cycler: &cycler}
}
// Starts the poller and triggers cycle at set interval.
func (p *poller) Start() {
log.Println("Starting poller")
log.Println("Will start polling after initial tick...")
ticker := p.ticker
go func() {
for {
_, open := <-ticker.Tick()
log.Println("Ticking...")
if !open {
return
}
go func() {
err := p.cycler.Notify()
if err != nil {
log.Fatalf("Client has thrown error, exiting... %s", err.Error())
}
}()
}
}()
}
// Stops the poller.
func (p *poller) Stop() {
log.Println("Stopping poller")
p.ticker.Stop()
p.cycler.Stop()
}