// New instantiates a running MetricBatcher. Eventswill be emitted once per batchDuration. All
// updates to a given counter name will be combined into a single event and sent to metricSender.
func New(metricSender metric_sender.MetricSender, batchDuration time.Duration) *MetricBatcher {
mb := &MetricBatcher{
metrics: make(map[string]uint64),
batchTicker: time.NewTicker(batchDuration),
metricSender: metricSender,
}
go func() {
for {
<-mb.batchTicker.C
mb.lock.Lock()
for name, delta := range mb.metrics {
metricSender.AddToCounter(name, delta)
}
mb.unsafeReset()
mb.lock.Unlock()
}
}()
return mb
}
package metric_sender_test
import (
"errors"
"github.com/cloudfoundry/dropsonde/emitter/fake"
"github.com/cloudfoundry/dropsonde/events"
"github.com/cloudfoundry/dropsonde/metric_sender"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("MetricSender", func() {
var (
emitter *fake.FakeEventEmitter
sender metric_sender.MetricSender
)
BeforeEach(func() {
emitter = fake.NewFakeEventEmitter("origin")
sender = metric_sender.NewMetricSender(emitter)
})
It("sends a metric to its emitter", func() {
err := sender.SendValue("metric-name", 42, "answers")
Expect(err).NotTo(HaveOccurred())
Expect(emitter.GetMessages()).To(HaveLen(1))
metric := emitter.GetMessages()[0].Event.(*events.ValueMetric)
Expect(metric.GetName()).To(Equal("metric-name"))
Expect(metric.GetValue()).To(BeNumerically("==", 42))
package metric_sender_test
import (
"errors"
"github.com/cloudfoundry/dropsonde/emitter/fake"
"github.com/cloudfoundry/dropsonde/events"
"github.com/cloudfoundry/dropsonde/metric_sender"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("MetricSender", func() {
var (
emitter *fake.FakeEventEmitter
sender metric_sender.MetricSender
)
BeforeEach(func() {
emitter = fake.NewFakeEventEmitter("origin")
sender = metric_sender.NewMetricSender(emitter)
})
It("sends a metric to its emitter", func() {
err := sender.SendValue("metric-name", 42, "answers")
Expect(err).NotTo(HaveOccurred())
Expect(emitter.Messages).To(HaveLen(1))
metric := emitter.Messages[0].Event.(*events.ValueMetric)
Expect(metric.GetName()).To(Equal("metric-name"))
Expect(metric.GetValue()).To(BeNumerically("==", 42))