forked from mirrors/statsd_exporter
83 lines
1.9 KiB
Go
83 lines
1.9 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 randomreplacement
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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/prometheus/statsd_exporter/pkg/mappercache"
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)
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type metricMapperRRCache struct {
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lock sync.RWMutex
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size int
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items map[string]interface{}
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metrics *mappercache.CacheMetrics
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}
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func NewMetricMapperRRCache(reg prometheus.Registerer, size int) (*metricMapperRRCache, 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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c := &metricMapperRRCache{
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items: make(map[string]interface{}, size+1),
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size: size,
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metrics: metrics,
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}
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return c, nil
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}
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func (m *metricMapperRRCache) Get(metricKey string) (interface{}, bool) {
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m.lock.RLock()
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result, ok := m.items[metricKey]
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m.lock.RUnlock()
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return result, ok
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}
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func (m *metricMapperRRCache) Add(metricKey string, result interface{}) {
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go m.trackCacheLength()
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m.lock.Lock()
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m.items[metricKey] = result
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// evict an item if needed
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if len(m.items) > m.size {
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for k := range m.items {
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delete(m.items, k)
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break
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}
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}
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m.lock.Unlock()
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}
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func (m *metricMapperRRCache) Reset() {
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m.lock.Lock()
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defer m.lock.Unlock()
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m.items = make(map[string]interface{}, m.size+1)
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m.metrics.CacheLength.Set(0)
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}
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func (m *metricMapperRRCache) trackCacheLength() {
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m.lock.RLock()
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length := len(m.items)
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m.lock.RUnlock()
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m.metrics.CacheLength.Set(float64(length))
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}
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