78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
// Copyright 2019, OpenCensus Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package metricproducer
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import (
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"sync"
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)
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// Manager maintains a list of active producers. Producers can register
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// with the manager to allow readers to read all metrics provided by them.
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// Readers can retrieve all producers registered with the manager,
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// read metrics from the producers and export them.
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type Manager struct {
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mu sync.RWMutex
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producers map[Producer]struct{}
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}
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var prodMgr *Manager
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var once sync.Once
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// GlobalManager is a single instance of producer manager
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// that is used by all producers and all readers.
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func GlobalManager() *Manager {
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once.Do(func() {
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prodMgr = &Manager{}
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prodMgr.producers = make(map[Producer]struct{})
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})
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return prodMgr
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}
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// AddProducer adds the producer to the Manager if it is not already present.
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func (pm *Manager) AddProducer(producer Producer) {
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if producer == nil {
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return
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}
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pm.mu.Lock()
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defer pm.mu.Unlock()
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pm.producers[producer] = struct{}{}
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}
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// DeleteProducer deletes the producer from the Manager if it is present.
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func (pm *Manager) DeleteProducer(producer Producer) {
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if producer == nil {
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return
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}
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pm.mu.Lock()
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defer pm.mu.Unlock()
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delete(pm.producers, producer)
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}
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// GetAll returns a slice of all producer currently registered with
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// the Manager. For each call it generates a new slice. The slice
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// should not be cached as registration may change at any time. It is
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// typically called periodically by exporter to read metrics from
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// the producers.
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func (pm *Manager) GetAll() []Producer {
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pm.mu.Lock()
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defer pm.mu.Unlock()
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producers := make([]Producer, len(pm.producers))
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i := 0
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for producer := range pm.producers {
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producers[i] = producer
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i++
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}
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return producers
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}
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