mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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a485d0ec64
* 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)
82 lines
2.2 KiB
Go
82 lines
2.2 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package trace
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import (
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"sync"
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"sync/atomic"
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export "go.opentelemetry.io/otel/sdk/export/trace"
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)
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// SpanProcessor is interface to add hooks to start and end method invocations.
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type SpanProcessor interface {
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// OnStart method is invoked when span is started. It is a synchronous call
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// and hence should not block.
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OnStart(sd *export.SpanData)
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// OnEnd method is invoked when span is finished. It is a synchronous call
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// and hence should not block.
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OnEnd(sd *export.SpanData)
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// Shutdown is invoked when SDK shutsdown. Use this call to cleanup any processor
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// data. No calls to OnStart and OnEnd method is invoked after Shutdown call is
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// made. It should not be blocked indefinitely.
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Shutdown()
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}
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type spanProcessorMap map[SpanProcessor]*sync.Once
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var (
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mu sync.Mutex
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spanProcessors atomic.Value
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)
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// RegisterSpanProcessor adds to the list of SpanProcessors that will receive sampled
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// trace spans.
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func RegisterSpanProcessor(e SpanProcessor) {
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mu.Lock()
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defer mu.Unlock()
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new := make(spanProcessorMap)
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if old, ok := spanProcessors.Load().(spanProcessorMap); ok {
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for k, v := range old {
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new[k] = v
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}
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}
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new[e] = &sync.Once{}
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spanProcessors.Store(new)
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}
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// UnregisterSpanProcessor removes from the list of SpanProcessors the SpanProcessor that was
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// registered with the given name.
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func UnregisterSpanProcessor(s SpanProcessor) {
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mu.Lock()
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defer mu.Unlock()
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new := make(spanProcessorMap)
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if old, ok := spanProcessors.Load().(spanProcessorMap); ok {
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for k, v := range old {
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new[k] = v
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}
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}
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if stopOnce, ok := new[s]; ok && stopOnce != nil {
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stopOnce.Do(func() {
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s.Shutdown()
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})
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}
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delete(new, s)
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spanProcessors.Store(new)
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}
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