forked from mirrors/statsd_exporter
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
package lru
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import (
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"github.com/prometheus/client_golang/prometheus"
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lru2 "github.com/hashicorp/golang-lru"
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"github.com/prometheus/statsd_exporter/pkg/mapper_cache"
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)
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type metricMapperLRUCache struct {
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cache *lru2.Cache
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metrics *mapper_cache.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 := mapper_cache.NewCacheMetrics(reg)
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cache, err := lru2.New(size)
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if err != nil {
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return &metricMapperLRUCache{}, err
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}
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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.Purge()
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m.metrics.CacheLength.Set(0)
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}
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