/
ticker.go
42 lines (36 loc) · 855 Bytes
/
ticker.go
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package test
import (
"sync/atomic"
"time"
"gopkg.in/sensorbee/sensorbee.v0/bql/udf"
"gopkg.in/sensorbee/sensorbee.v0/core"
"gopkg.in/sensorbee/sensorbee.v0/data"
)
type Ticker struct {
interval time.Duration
stopped int32
}
func (t *Ticker) Process(ctx *core.Context, tuple *core.Tuple, w core.Writer) error {
var i int64
for ; atomic.LoadInt32(&t.stopped) == 0; i++ {
newTuple := core.NewTuple(data.Map{"tick": data.Int(i)})
if err := w.Write(ctx, newTuple); err != nil {
return err
}
time.Sleep(t.interval)
}
return nil
}
func (t *Ticker) Terminate(ctx *core.Context) error {
atomic.StoreInt32(&t.stopped, 1)
return nil
}
func CreateTicker(decl udf.UDSFDeclarer, i data.Value) (udf.UDSF, error) {
interval, err := data.ToDuration(i)
if err != nil {
return nil, err
}
return &Ticker{
interval: interval,
}, nil
}