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73 lines
2.8 KiB
73 lines
2.8 KiB
// 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 // import "go.opentelemetry.io/otel/sdk/trace"
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import (
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"context"
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"sync"
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)
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// SpanProcessor is a processing pipeline for spans in the trace signal.
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// SpanProcessors registered with a TracerProvider and are called at the start
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// and end of a Span's lifecycle, and are called in the order they are
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// registered.
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type SpanProcessor interface {
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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// OnStart is called when a span is started. It is called synchronously
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// and should not block.
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OnStart(parent context.Context, s ReadWriteSpan)
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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// OnEnd is called when span is finished. It is called synchronously and
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// hence not block.
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OnEnd(s ReadOnlySpan)
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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// Shutdown is called when the SDK shuts down. Any cleanup or release of
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// resources held by the processor should be done in this call.
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//
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// Calls to OnStart, OnEnd, or ForceFlush after this has been called
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// should be ignored.
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//
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// All timeouts and cancellations contained in ctx must be honored, this
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// should not block indefinitely.
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Shutdown(ctx context.Context) error
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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// ForceFlush exports all ended spans to the configured Exporter that have not yet
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// been exported. It should only be called when absolutely necessary, such as when
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// using a FaaS provider that may suspend the process after an invocation, but before
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// the Processor can export the completed spans.
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ForceFlush(ctx context.Context) error
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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}
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type spanProcessorState struct {
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sp SpanProcessor
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state *sync.Once
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}
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func newSpanProcessorState(sp SpanProcessor) *spanProcessorState {
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return &spanProcessorState{sp: sp, state: &sync.Once{}}
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}
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type spanProcessorStates []*spanProcessorState
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