sampler

Documentation

Index

• type Hook
  • func (hook *Hook) Flush()
  • func (hook *Hook) ProcessSpan(span tracer.Span) bool

Types

type Hook

type Hook struct {
	sampler.Sampler
}

Hook is a types.Hook implementation which samples the spans. This is supposed to be used for performance reasons in high performance applications.

Setup example:

import (
	"github.com/facebookincubator/go-belt/pkg/sampler"
	samplerhook "github.com/facebookincubator/go-belt/tool/experimental/tracer/hooks/sampler"
	"github.com/facebookincubator/go-belt/tool/experimental/tracer/implementation/zipkin"
)

func main() {
	...
	ctx = tracer.CtxWithTracer(ctx, zipkin.New(zipkinClient).WithPreHooks(
		samplerhook.NewSamplerPreHook(sampler.RandomSampler(0.1)),
	))
	...
}

func (*Hook) Flush

func (hook *Hook) Flush()

Flush implements tracer.Hook

func (*Hook) ProcessSpan

func (hook *Hook) ProcessSpan(span tracer.Span) bool

ProcessSpan implements tracer.Hook