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