move global trace provider api to global package.

example/basic/main.go

@@ -21,10 +21,11 @@ import (
 	"go.opentelemetry.io/api/key"
 	"go.opentelemetry.io/api/metric"
 	"go.opentelemetry.io/api/trace"
+	"go.opentelemetry.io/global"
 )
 
 var (
-	tracer = trace.GlobalProvider().GetTracer("ex.com/basic")
+	tracer = global.TraceProvider().GetTracer("ex.com/basic")
 
 	meter = metric.GlobalMeter() // TODO: should share resources ^^^?
 

example/http-stackdriver/client/client.go

@@ -30,6 +30,7 @@ import (
 	"go.opentelemetry.io/api/key"
 	"go.opentelemetry.io/api/trace"
 	"go.opentelemetry.io/exporter/trace/stackdriver"
+	"go.opentelemetry.io/global"
 	"go.opentelemetry.io/plugin/httptrace"
 	sdktrace "go.opentelemetry.io/sdk/trace"
 )
@@ -53,12 +54,12 @@ func initTracer() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	trace.SetGlobalProvider(tp)
+	global.SetTraceProvider(tp)
 }
 
 func main() {
 	initTracer()
-	tr := trace.GlobalProvider().GetTracer("stackdriver/example/client")
+	tr := global.TraceProvider().GetTracer("stackdriver/example/client")
 
 	client := http.DefaultClient
 	ctx := distributedcontext.NewContext(context.Background(),

example/http-stackdriver/server/server.go

@@ -23,6 +23,7 @@ import (
 	"go.opentelemetry.io/api/distributedcontext"
 	"go.opentelemetry.io/api/trace"
 	"go.opentelemetry.io/exporter/trace/stackdriver"
+	"go.opentelemetry.io/global"
 	"go.opentelemetry.io/plugin/httptrace"
 	sdktrace "go.opentelemetry.io/sdk/trace"
 )
@@ -46,13 +47,13 @@ func initTracer() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	trace.SetGlobalProvider(tp)
+	global.SetTraceProvider(tp)
 }
 
 func main() {
 	initTracer()
 
-	tr := trace.GlobalProvider().GetTracer("stackdriver/example/server")
+	tr := global.TraceProvider().GetTracer("stackdriver/example/server")
 
 	helloHandler := func(w http.ResponseWriter, req *http.Request) {
 		attrs, entries, spanCtx := httptrace.Extract(req.Context(), req)

example/http/client/client.go

@@ -29,6 +29,7 @@ import (
 	"go.opentelemetry.io/api/key"
 	"go.opentelemetry.io/api/trace"
 	"go.opentelemetry.io/exporter/trace/stdout"
+	"go.opentelemetry.io/global"
 	"go.opentelemetry.io/plugin/httptrace"
 	sdktrace "go.opentelemetry.io/sdk/trace"
 )
@@ -49,7 +50,7 @@ func initTracer() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	trace.SetGlobalProvider(tp)
+	global.SetTraceProvider(tp)
 }
 
 func main() {
@@ -62,7 +63,7 @@ func main() {
 
 	var body []byte
 
-	tr := trace.GlobalProvider().GetTracer("example/client")
+	tr := global.TraceProvider().GetTracer("example/client")
 	err := tr.WithSpan(ctx, "say hello",
 		func(ctx context.Context) error {
 			req, _ := http.NewRequest("GET", "http://localhost:7777/hello", nil)

example/http/server/server.go

@@ -22,6 +22,7 @@ import (
 	"go.opentelemetry.io/api/distributedcontext"
 	"go.opentelemetry.io/api/trace"
 	"go.opentelemetry.io/exporter/trace/stdout"
+	"go.opentelemetry.io/global"
 	"go.opentelemetry.io/plugin/httptrace"
 	sdktrace "go.opentelemetry.io/sdk/trace"
 )
@@ -42,12 +43,12 @@ func initTracer() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	trace.SetGlobalProvider(tp)
+	global.SetTraceProvider(tp)
 }
 
 func main() {
 	initTracer()
-	tr := trace.GlobalProvider().GetTracer("example/server")
+	tr := global.TraceProvider().GetTracer("example/server")
 
 	helloHandler := func(w http.ResponseWriter, req *http.Request) {
 		attrs, entries, spanCtx := httptrace.Extract(req.Context(), req)

example/namedtracer/foo/foo.go

@@ -19,6 +19,7 @@ import (
 
 	"go.opentelemetry.io/api/key"
 	"go.opentelemetry.io/api/trace"
+	"go.opentelemetry.io/global"
 )
 
 var (
@@ -31,7 +32,7 @@ func SubOperation(ctx context.Context) error {
 
 	// Using global provider. Alternative is to have application provide a getter
 	// for its component to get the instance of the provider.
-	tr := trace.GlobalProvider().GetTracer("example/namedtracer/foo")
+	tr := global.TraceProvider().GetTracer("example/namedtracer/foo")
 	return tr.WithSpan(
 		ctx,
 		"Sub operation...",

example/namedtracer/main.go

@@ -23,6 +23,7 @@ import (
 	"go.opentelemetry.io/api/trace"
 	"go.opentelemetry.io/example/namedtracer/foo"
 	"go.opentelemetry.io/exporter/trace/stdout"
+	"go.opentelemetry.io/global"
 	sdktrace "go.opentelemetry.io/sdk/trace"
 )
 
@@ -47,7 +48,7 @@ func initTracer() {
 	if err != nil {
 		log.Panicf("failed to initialize trace provider %v\n", err)
 	}
-	trace.SetGlobalProvider(tp)
+	global.SetTraceProvider(tp)
 }
 
 func main() {

experimental/bridge/opentracing/mix_test.go

@@ -25,6 +25,7 @@ import (
 
 	otelcore "go.opentelemetry.io/api/core"
 	oteltrace "go.opentelemetry.io/api/trace"
+	"go.opentelemetry.io/global"
 
 	"go.opentelemetry.io/experimental/bridge/opentracing/internal"
 )
@@ -118,7 +119,7 @@ func TestMixedAPIs(t *testing.T) {
 		})
 		ctx := context.Background()
 
-		oteltrace.SetGlobalProvider(otelProvider)
+		global.SetTraceProvider(otelProvider)
 		ot.SetGlobalTracer(otTracer)
 
 		tc.setup(t, mockOtelTracer)
@@ -424,7 +425,7 @@ func (tm *tracerMessTest) setup(t *testing.T, tracer *internal.MockTracer) {
 
 func (tm *tracerMessTest) check(t *testing.T, tracer *internal.MockTracer) {
 	globalOtTracer := ot.GlobalTracer()
-	globalOtelTracer := oteltrace.GlobalProvider().GetTracer("")
+	globalOtelTracer := global.TraceProvider().GetTracer("")
 	if len(tm.recordedOTSpanTracers) != 3 {
 		t.Errorf("Expected 3 recorded OpenTracing tracers from spans, got %d", len(tm.recordedOTSpanTracers))
 	}
@@ -543,7 +544,7 @@ func min(a, b int) int {
 }
 
 func runOtelOTOtel(t *testing.T, ctx context.Context, name string, callback func(*testing.T, context.Context)) {
-	tr := oteltrace.GlobalProvider().GetTracer("")
+	tr := global.TraceProvider().GetTracer("")
 	ctx, span := tr.Start(ctx, fmt.Sprintf("%s_Otel_OTOtel", name), oteltrace.WithSpanKind(oteltrace.SpanKindClient))
 	defer span.End()
 	callback(t, ctx)
@@ -560,7 +561,7 @@ func runOtelOTOtel(t *testing.T, ctx context.Context, name string, callback func
 }
 
 func runOTOtelOT(t *testing.T, ctx context.Context, name string, callback func(*testing.T, context.Context)) {
-	tr := oteltrace.GlobalProvider().GetTracer("")
+	tr := global.TraceProvider().GetTracer("")
 	span, ctx := ot.StartSpanFromContext(ctx, fmt.Sprintf("%s_OT_OtelOT", name), ot.Tag{Key: "span.kind", Value: "client"})
 	defer span.Finish()
 	callback(t, ctx)

exporter/trace/jaeger/example/main.go

@@ -23,8 +23,8 @@ import (
 	"go.opentelemetry.io/api/core"
 	"go.opentelemetry.io/api/key"
 
-	apitrace "go.opentelemetry.io/api/trace"
 	"go.opentelemetry.io/exporter/trace/jaeger"
+	"go.opentelemetry.io/global"
 	sdktrace "go.opentelemetry.io/sdk/trace"
 )
 
@@ -45,7 +45,6 @@ func initTracer() func() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	exporter.RegisterSimpleSpanProcessor()
 
 	// For demoing purposes, always sample. In a production application, you should
 	// configure this to a trace.ProbabilitySampler set at the desired
@@ -56,7 +55,7 @@ func initTracer() func() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	apitrace.SetGlobalProvider(tp)
+	global.SetTraceProvider(tp)
 	return func() {
 		exporter.Flush()
 	}
@@ -68,14 +67,14 @@ func main() {
 
 	ctx := context.Background()
 
-	tr := apitrace.GlobalProvider().GetTracer("component-main")
+	tr := global.TraceProvider().GetTracer("component-main")
 	ctx, span := tr.Start(ctx, "/foo")
 	bar(ctx)
 	span.End()
 }
 
 func bar(ctx context.Context) {
-	tr := apitrace.GlobalProvider().GetTracer("component-bar")
+	tr := global.TraceProvider().GetTracer("component-bar")
 	_, span := tr.Start(ctx, "/bar")
 	defer span.End()
 

api/trace/global.go → global/global.go

@@ -12,28 +12,32 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package trace
+package global
 
-import "sync/atomic"
+import (
+	"sync/atomic"
+
+	"go.opentelemetry.io/api/trace"
+)
 
 type globalProvider struct {
-	p Provider
+	p trace.Provider
 }
 
 var globalP atomic.Value
 
-// GlobalProvider returns trace provider registered with global registry.
-// If no trace provider is registered then an instance of NoopTraceProvider is returned.
+// TraceProvider returns the registered global trace provider.
+// If none is registered then an instance of NoopTraceProvider is returned.
 // Use the trace provider to create a named tracer. E.g.
-//     tracer := trace.GlobalProvider().GetTracer("example.com/foo")
-func GlobalProvider() Provider {
+//     tracer := global.TraceProvider().GetTracer("example.com/foo")
+func TraceProvider() trace.Provider {
 	if gp := globalP.Load(); gp != nil {
 		return gp.(globalProvider).p
 	}
-	return NoopTraceProvider{}
+	return trace.NoopTraceProvider{}
 }
 
-// SetGlobalProvider sets the provider as a global trace provider.
-func SetGlobalProvider(m Provider) {
-	globalP.Store(globalProvider{p: m})
+// SetTraceProvider registers p as the global trace provider.
+func SetTraceProvider(p trace.Provider) {
+	globalP.Store(globalProvider{p: p})
 }

api/trace/global_test.go → global/global_test.go

@@ -12,12 +12,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package trace_test
+package global_test
 
 import (
 	"testing"
 
 	"go.opentelemetry.io/api/trace"
+	"go.opentelemetry.io/global"
 )
 
 type TestProvider1 struct {
@@ -33,10 +34,10 @@ func TestMulitpleGlobalProvider(t *testing.T) {
 
 	p1 := TestProvider1{}
 	p2 := trace.NoopTraceProvider{}
-	trace.SetGlobalProvider(&p1)
-	trace.SetGlobalProvider(&p2)
+	global.SetTraceProvider(&p1)
+	global.SetTraceProvider(&p2)
 
-	got := trace.GlobalProvider()
+	got := global.TraceProvider()
 	want := &p2
 	if got != want {
 		t.Fatalf("Provider: got %p, want %p\n", got, want)

plugin/httptrace/clienttrace.go

@@ -28,6 +28,7 @@ import (
 	"go.opentelemetry.io/api/core"
 	"go.opentelemetry.io/api/key"
 	"go.opentelemetry.io/api/trace"
+	"go.opentelemetry.io/global"
 )
 
 var (
@@ -54,7 +55,7 @@ func newClientTracer(ctx context.Context) *clientTracer {
 		Context: ctx,
 		levels:  make(map[string]trace.Span),
 	}
-	ct.tr = trace.GlobalProvider().GetTracer("go.opentelemetry.io/plugin/httptrace")
+	ct.tr = global.TraceProvider().GetTracer("go.opentelemetry.io/plugin/httptrace")
 	ct.open("http.request")
 	return ct
 }

plugin/othttp/handler.go

@@ -21,6 +21,7 @@ import (
 	"go.opentelemetry.io/api/core"
 	"go.opentelemetry.io/api/propagation"
 	"go.opentelemetry.io/api/trace"
+	"go.opentelemetry.io/global"
 	prop "go.opentelemetry.io/propagation"
 )
 
@@ -129,7 +130,7 @@ func WithMessageEvents(events ...event) Option {
 func NewHandler(handler http.Handler, operation string, opts ...Option) http.Handler {
 	h := Handler{handler: handler, operation: operation}
 	defaultOpts := []Option{
-		WithTracer(trace.GlobalProvider().GetTracer("go.opentelemtry.io/plugin/othttp")),
+		WithTracer(global.TraceProvider().GetTracer("go.opentelemtry.io/plugin/othttp")),
 		WithPropagator(prop.HTTPTraceContextPropagator{}),
 		WithSpanOptions(trace.WithSpanKind(trace.SpanKindServer)),
 	}

plugin/othttp/handler_example_test.go

@@ -25,6 +25,7 @@ import (
 	"go.opentelemetry.io/api/core"
 	"go.opentelemetry.io/api/trace"
 	"go.opentelemetry.io/exporter/trace/stdout"
+	"go.opentelemetry.io/global"
 	"go.opentelemetry.io/plugin/othttp"
 	sdktrace "go.opentelemetry.io/sdk/trace"
 )
@@ -55,7 +56,7 @@ func ExampleNewHandler() {
 	if err != nil {
 		log.Fatal(err)
 	}
-	trace.SetGlobalProvider(tp)
+	global.SetTraceProvider(tp)
 
 	figureOutName := func(ctx context.Context, s string) (string, error) {
 		pp := strings.SplitN(s, "/", 2)