github.com/matrixorigin/matrixone@v0.7.0/pkg/util/trace/trace.go (about)

     1  // Copyright The OpenTelemetry Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // Portions of this file are additionally subject to the following
    16  // copyright.
    17  //
    18  // Copyright (C) 2022 Matrix Origin.
    19  //
    20  // Modified the behavior and the interface of the step.
    21  
    22  package trace
    23  
    24  import (
    25  	"context"
    26  	"sync/atomic"
    27  )
    28  
    29  func Start(ctx context.Context, spanName string, opts ...SpanOption) (context.Context, Span) {
    30  	return DefaultTracer().Start(ctx, spanName, opts...)
    31  }
    32  
    33  func Debug(ctx context.Context, spanName string, opts ...SpanOption) (context.Context, Span) {
    34  	return DefaultTracer().Debug(ctx, spanName, opts...)
    35  }
    36  
    37  func Generate(ctx context.Context) context.Context {
    38  	ctx, _ = DefaultTracer().Start(ctx, "generate", WithNewRoot(true))
    39  	return ctx
    40  }
    41  
    42  func IsEnable() bool {
    43  	return DefaultTracer().IsEnable()
    44  }
    45  
    46  var gTracerHolder atomic.Value
    47  
    48  type tracerHolder struct {
    49  	tracer Tracer
    50  }
    51  
    52  func SetDefaultTracer(tracer Tracer) {
    53  	gTracerHolder.Store(&tracerHolder{tracer: tracer})
    54  }
    55  
    56  func DefaultTracer() Tracer {
    57  	return gTracerHolder.Load().(*tracerHolder).tracer
    58  }
    59  
    60  func init() {
    61  	SetDefaultTracer(noopTracerProvider{}.Tracer("init"))
    62  }