mirror of
https://github.com/prometheus/statsd_exporter.git
synced 2024-05-18 17:18:11 +00:00
104 lines
2.3 KiB
Go
104 lines
2.3 KiB
Go
// Copyright 2021 The Prometheus 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 lru
|
|
|
|
import (
|
|
"sync"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
|
|
"github.com/golang/groupcache/lru"
|
|
|
|
"github.com/prometheus/statsd_exporter/pkg/mappercache"
|
|
)
|
|
|
|
type metricMapperLRUCache struct {
|
|
cache *lruCache
|
|
metrics *mappercache.CacheMetrics
|
|
}
|
|
|
|
func NewMetricMapperLRUCache(reg prometheus.Registerer, size int) (*metricMapperLRUCache, error) {
|
|
if size <= 0 {
|
|
return nil, nil
|
|
}
|
|
|
|
metrics := mappercache.NewCacheMetrics(reg)
|
|
cache := newLruCache(size)
|
|
|
|
return &metricMapperLRUCache{metrics: metrics, cache: cache}, nil
|
|
}
|
|
|
|
func (m *metricMapperLRUCache) Get(metricKey string) (interface{}, bool) {
|
|
m.metrics.CacheGetsTotal.Inc()
|
|
if result, ok := m.cache.Get(metricKey); ok {
|
|
m.metrics.CacheHitsTotal.Inc()
|
|
return result, true
|
|
} else {
|
|
return nil, false
|
|
}
|
|
}
|
|
|
|
func (m *metricMapperLRUCache) Add(metricKey string, result interface{}) {
|
|
go m.trackCacheLength()
|
|
m.cache.Add(metricKey, result)
|
|
}
|
|
|
|
func (m *metricMapperLRUCache) trackCacheLength() {
|
|
m.metrics.CacheLength.Set(float64(m.cache.Len()))
|
|
}
|
|
|
|
func (m *metricMapperLRUCache) Reset() {
|
|
m.cache.Clear()
|
|
m.metrics.CacheLength.Set(0)
|
|
}
|
|
|
|
type lruCache struct {
|
|
cache *lru.Cache
|
|
lock sync.RWMutex
|
|
}
|
|
|
|
func newLruCache(maxEntries int) *lruCache {
|
|
return &lruCache{
|
|
cache: lru.New(maxEntries),
|
|
}
|
|
}
|
|
|
|
func (l *lruCache) Get(key string) (interface{}, bool) {
|
|
l.lock.RLock()
|
|
defer l.lock.RUnlock()
|
|
|
|
return l.cache.Get(key)
|
|
}
|
|
|
|
func (l *lruCache) Add(key string, value interface{}) {
|
|
l.lock.Lock()
|
|
defer l.lock.Unlock()
|
|
|
|
l.cache.Add(key, value)
|
|
}
|
|
|
|
func (l *lruCache) Len() int {
|
|
l.lock.RLock()
|
|
defer l.lock.RUnlock()
|
|
|
|
return l.cache.Len()
|
|
}
|
|
|
|
func (l *lruCache) Clear() {
|
|
l.lock.Lock()
|
|
defer l.lock.Unlock()
|
|
|
|
l.cache.Clear()
|
|
}
|