tidb registry 源码
tidb registry 代码
文件路径：/util/promutil/registry.go
// Copyright 2022 PingCAP, 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 promutil
import "github.com/prometheus/client_golang/prometheus"
// Registry is the interface to register or unregister metrics.
type Registry = prometheus.Registerer
var _ Registry = noopRegistry{}
type noopRegistry struct{}
func (noopRegistry) Register(_ prometheus.Collector) error {
return nil
}
func (noopRegistry) MustRegister(_ ...prometheus.Collector) {}
func (noopRegistry) Unregister(_ prometheus.Collector) bool {
return true
}
// NewNoopRegistry returns a Registry that does nothing.
// It is used for the case where metrics have been registered
// in factory automatically.
func NewNoopRegistry() Registry {
return noopRegistry{}
}
// NewDefaultRegistry returns a default implementation of Registry.
func NewDefaultRegistry() Registry {
return prometheus.NewRegistry()
}
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