github.com/matrixorigin/matrixone@v1.2.0/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  // Start starts a default span entity
    30  func Start(ctx context.Context, spanName string, opts ...SpanStartOption) (context.Context, Span) {
    31  	return DefaultTracer().Start(ctx, spanName, opts...)
    32  }
    33  
    34  func Debug(ctx context.Context, spanName string, opts ...SpanStartOption) (context.Context, Span) {
    35  	return DefaultTracer().Debug(ctx, spanName, opts...)
    36  }
    37  
    38  func Generate(ctx context.Context) context.Context {
    39  	ctx, _ = DefaultTracer().Start(ctx, "generate", WithNewRoot(true))
    40  	return ctx
    41  }
    42  
    43  func IsEnable(opts ...SpanStartOption) bool {
    44  	return DefaultTracer().IsEnable(opts...)
    45  }
    46  
    47  var gTracerHolder atomic.Value
    48  
    49  type ITracerHolder interface {
    50  	GetTracer() Tracer
    51  }
    52  
    53  type tracerHolder struct {
    54  	tracer Tracer
    55  }
    56  
    57  func (h *tracerHolder) GetTracer() Tracer { return h.tracer }
    58  
    59  func SetDefaultTracer(tracer Tracer) {
    60  	var holder ITracerHolder = &tracerHolder{tracer: tracer}
    61  	gTracerHolder.Store(holder)
    62  }
    63  
    64  func DefaultTracer() Tracer {
    65  	return gTracerHolder.Load().(ITracerHolder).GetTracer()
    66  }
    67  
    68  func init() {
    69  	SetDefaultTracer(noopTracerProvider{}.Tracer("init"))
    70  }