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opentelemetry-go/sdk/trace/span_processor.go
Mikhail Mazurskiy 22fd10447d
Unify TracerProvider span processor lookups (#3942)
* Pre-allocate spanProcessorStates slice

* Make sync.Once a non-pointer

It doesn't need to be a pointer, can be part of the struct to avoid allocating a separate object for it

* getSpanProcessors() helper

* Add tests for UnregisterSpanProcessor()
2023-04-01 07:57:35 -07:00

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