// TestBackendSwitch tests the correct switching between backends.
func TestBackendSwitch(t *testing.T) {
assert := audit.NewTestingAssertion(t, true)
sleep := 10 * time.Millisecond
// First standard.
monitoring.SetBackend(monitoring.NewStandardBackend())
monitoring.Measure("test-a", func() { time.Sleep(sleep) })
time.Sleep(sleep)
mp, err := monitoring.ReadMeasuringPoint("test-a")
assert.Nil(err)
assert.Equal(mp.Count(), int64(1))
assert.True(sleep <= mp.AvgDuration() && mp.AvgDuration() <= 2*sleep)
// Then null.
monitoring.SetBackend(monitoring.NewNullBackend())
monitoring.Measure("test", func() { time.Sleep(sleep) })
mp, err = monitoring.ReadMeasuringPoint("test")
assert.Nil(err)
assert.Equal(mp.ID(), "null")
assert.Equal(mp.Count(), int64(0))
// Finally standard again.
monitoring.SetBackend(monitoring.NewStandardBackend())
monitoring.Measure("test-b", func() { time.Sleep(sleep) })
time.Sleep(sleep)
mp, err = monitoring.ReadMeasuringPoint("test-a")
assert.ErrorMatch(err, `.* measuring point "test-a" does not exist`)
mp, err = monitoring.ReadMeasuringPoint("test-b")
assert.Nil(err)
assert.Equal(mp.Count(), int64(1))
assert.True(sleep <= mp.AvgDuration() && mp.AvgDuration() <= 2*sleep)
}
// BenchmarkNullBackendETM checks the performance of the ETM of the
// null backend.
func BenchmarkNullBackendETM(b *testing.B) {
monitoring.SetBackend(monitoring.NewNullBackend())
for i := 0; i < b.N; i++ {
monitoring.Measure("test", func() {})
}
}
// BenchmarkFilteredStandardBackendETM checks the performance of the ETM
// of the standard backend when filtered.
func BenchmarkFilteredStandardBackendETM(b *testing.B) {
monitoring.SetBackend(monitoring.NewStandardBackend())
monitoring.SetMeasuringsFilter(func(id string) bool {
return id != "test"
})
defer monitoring.SetMeasuringsFilter(nil)
for i := 0; i < b.N; i++ {
monitoring.Measure("test", func() {})
}
}