| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 stdout |
| |
| import ( |
| "sync" |
| ) |
| |
| import ( |
| "go.opentelemetry.io/otel/exporters/stdout/stdouttrace" |
| |
| sdktrace "go.opentelemetry.io/otel/sdk/trace" |
| ) |
| |
| import ( |
| "dubbo.apache.org/dubbo-go/v3/common/extension" |
| "dubbo.apache.org/dubbo-go/v3/otel/trace" |
| ) |
| |
| var ( |
| initOnce sync.Once |
| instance *Exporter |
| ) |
| |
| func init() { |
| extension.SetTraceExporter("stdout", newStdoutExporter) |
| } |
| |
| type Exporter struct { |
| *trace.DefaultExporter |
| } |
| |
| func newStdoutExporter(config *trace.ExporterConfig) (trace.Exporter, error) { |
| var initError error |
| if instance == nil { |
| initOnce.Do(func() { |
| customFunc := func() (sdktrace.SpanExporter, error) { |
| return stdouttrace.New(stdouttrace.WithPrettyPrint()) |
| } |
| tracerProvider, propagator, err := trace.NewExporter(config, customFunc) |
| if err != nil { |
| initError = err |
| return |
| } |
| |
| instance = &Exporter{ |
| DefaultExporter: &trace.DefaultExporter{ |
| TracerProvider: tracerProvider, |
| Propagator: propagator, |
| }, |
| } |
| }) |
| } |
| |
| return instance, initError |
| } |