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mirror of https://github.com/open-telemetry/opentelemetry-go.git synced 2024-12-22 20:06:07 +02:00
opentelemetry-go/example/namedtracer/foo/foo.go
Tyler Yahn a485d0ec64
Update License header for all source files (#586)
* Update License header for all source files

- Add Apache 2.0 header to source files that did not have one.
- Update all existing headers dated to 2019 to be 2020
- Remove comma from License header to comply with the Apache 2.0
  guidelines.

* Update Copyright notice

Use the standard Copyright notices outlined by the
[CNCF](https://github.com/cncf/foundation/blob/master/copyright-notices.md#copyright-notices)
2020-03-23 22:41:10 -07:00

48 lines
1.4 KiB
Go

// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package foo
import (
"context"
"go.opentelemetry.io/otel/api/global"
"go.opentelemetry.io/otel/api/key"
"go.opentelemetry.io/otel/api/trace"
)
var (
lemonsKey = key.New("ex.com/lemons")
)
// SubOperation is an example to demonstrate the use of named tracer.
// It creates a named tracer with its package path.
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 := global.Tracer("example/namedtracer/foo")
return tr.WithSpan(
ctx,
"Sub operation...",
func(ctx context.Context) error {
trace.SpanFromContext(ctx).SetAttributes(lemonsKey.String("five"))
trace.SpanFromContext(ctx).AddEvent(ctx, "Sub span event")
return nil
},
)
}