func (app Application) StartQueueGauge() {
if app.env.VCAPApplication.InstanceIndex != 0 {
return
}
queueGauge := metrics.NewQueueGauge(app.mother.Queue(), metrics.DefaultLogger, time.Tick(1*time.Second))
go queueGauge.Run()
}
. "github.com/onsi/gomega"
)
var _ = Describe("QueueGauge", func() {
var (
gauge metrics.QueueGauge
timer chan time.Time
queue *mocks.Queue
buffer *bytes.Buffer
)
BeforeEach(func() {
buffer = bytes.NewBuffer([]byte{})
queue = mocks.NewQueue()
timer = make(chan time.Time, 10)
gauge = metrics.NewQueueGauge(queue, metrics.NewLogger(buffer), timer)
})
It("reports the number of items on the queue as a metric", func() {
go gauge.Run()
Expect(buffer.String()).To(BeEmpty())
timer <- time.Now()
Eventually(func() []string {
return strings.Split(buffer.String(), "\n")
}).Should(Equal([]string{
`[METRIC] {"kind":"gauge","payload":{"name":"notifications.queue.length","value":0}}`,
`[METRIC] {"kind":"gauge","payload":{"name":"notifications.queue.retry","tags":{"count":"0"},"value":0}}`,
`[METRIC] {"kind":"gauge","payload":{"name":"notifications.queue.retry","tags":{"count":"1"},"value":0}}`,