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keys_manager.go
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keys_manager.go
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// Copyright 2017, OpenCensus Authors
//
// 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 tag
import (
"sync"
)
var km = newKeysManager()
type keysManager struct {
sync.Mutex
keys map[string]Key
nextKeyID uint16
}
func newKeysManager() *keysManager {
return &keysManager{
keys: make(map[string]Key),
}
}
// newStringKey creates or retrieves a key of type keyString with name/ID
// set to the input argument name. Returns an error if a key with the same name
// exists and is of a different type.
func (km *keysManager) newStringKey(name string) (Key, error) {
km.Lock()
defer km.Unlock()
k, ok := km.keys[name]
if ok {
return k, nil
}
ks := Key{
name: name,
id: km.nextKeyID,
}
km.nextKeyID++
km.keys[name] = ks
return ks, nil
}
func (km *keysManager) count() int {
km.Lock()
defer km.Unlock()
return len(km.keys)
}
func (km *keysManager) clear() {
km.Lock()
defer km.Unlock()
for k := range km.keys {
delete(km.keys, k)
}
}