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- // Copyright (c) 2017 Uber Technologies, Inc.
- //
- // 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 jaeger
- import opentracing "github.com/opentracing/opentracing-go"
- // Observer can be registered with the Tracer to receive notifications about
- // new Spans.
- //
- // Deprecated: use jaeger.ContribObserver instead.
- type Observer interface {
- OnStartSpan(operationName string, options opentracing.StartSpanOptions) SpanObserver
- }
- // SpanObserver is created by the Observer and receives notifications about
- // other Span events.
- //
- // Deprecated: use jaeger.ContribSpanObserver instead.
- type SpanObserver interface {
- OnSetOperationName(operationName string)
- OnSetTag(key string, value interface{})
- OnFinish(options opentracing.FinishOptions)
- }
- // compositeObserver is a dispatcher to other observers
- type compositeObserver struct {
- observers []ContribObserver
- }
- // compositeSpanObserver is a dispatcher to other span observers
- type compositeSpanObserver struct {
- observers []ContribSpanObserver
- }
- // noopSpanObserver is used when there are no observers registered
- // on the Tracer or none of them returns span observers from OnStartSpan.
- var noopSpanObserver = &compositeSpanObserver{}
- func (o *compositeObserver) append(contribObserver ContribObserver) {
- o.observers = append(o.observers, contribObserver)
- }
- func (o *compositeObserver) OnStartSpan(sp opentracing.Span, operationName string, options opentracing.StartSpanOptions) ContribSpanObserver {
- var spanObservers []ContribSpanObserver
- for _, obs := range o.observers {
- spanObs, ok := obs.OnStartSpan(sp, operationName, options)
- if ok {
- if spanObservers == nil {
- spanObservers = make([]ContribSpanObserver, 0, len(o.observers))
- }
- spanObservers = append(spanObservers, spanObs)
- }
- }
- if len(spanObservers) == 0 {
- return noopSpanObserver
- }
- return &compositeSpanObserver{observers: spanObservers}
- }
- func (o *compositeSpanObserver) OnSetOperationName(operationName string) {
- for _, obs := range o.observers {
- obs.OnSetOperationName(operationName)
- }
- }
- func (o *compositeSpanObserver) OnSetTag(key string, value interface{}) {
- for _, obs := range o.observers {
- obs.OnSetTag(key, value)
- }
- }
- func (o *compositeSpanObserver) OnFinish(options opentracing.FinishOptions) {
- for _, obs := range o.observers {
- obs.OnFinish(options)
- }
- }
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