mirror of
https://github.com/prometheus/statsd_exporter.git
synced 2024-12-23 05:56:31 +00:00
83 lines
1.9 KiB
Go
83 lines
1.9 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 randomreplacement
|
|
|
|
import (
|
|
"sync"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
|
|
"github.com/prometheus/statsd_exporter/pkg/mappercache"
|
|
)
|
|
|
|
type metricMapperRRCache struct {
|
|
lock sync.RWMutex
|
|
size int
|
|
items map[string]interface{}
|
|
metrics *mappercache.CacheMetrics
|
|
}
|
|
|
|
func NewMetricMapperRRCache(reg prometheus.Registerer, size int) (*metricMapperRRCache, error) {
|
|
if size <= 0 {
|
|
return nil, nil
|
|
}
|
|
|
|
metrics := mappercache.NewCacheMetrics(reg)
|
|
c := &metricMapperRRCache{
|
|
items: make(map[string]interface{}, size+1),
|
|
size: size,
|
|
metrics: metrics,
|
|
}
|
|
return c, nil
|
|
}
|
|
|
|
func (m *metricMapperRRCache) Get(metricKey string) (interface{}, bool) {
|
|
m.lock.RLock()
|
|
result, ok := m.items[metricKey]
|
|
m.lock.RUnlock()
|
|
|
|
return result, ok
|
|
}
|
|
|
|
func (m *metricMapperRRCache) Add(metricKey string, result interface{}) {
|
|
go m.trackCacheLength()
|
|
|
|
m.lock.Lock()
|
|
|
|
m.items[metricKey] = result
|
|
|
|
// evict an item if needed
|
|
if len(m.items) > m.size {
|
|
for k := range m.items {
|
|
delete(m.items, k)
|
|
break
|
|
}
|
|
}
|
|
|
|
m.lock.Unlock()
|
|
}
|
|
|
|
func (m *metricMapperRRCache) Reset() {
|
|
m.lock.Lock()
|
|
defer m.lock.Unlock()
|
|
m.items = make(map[string]interface{}, m.size+1)
|
|
m.metrics.CacheLength.Set(0)
|
|
}
|
|
|
|
func (m *metricMapperRRCache) trackCacheLength() {
|
|
m.lock.RLock()
|
|
length := len(m.items)
|
|
m.lock.RUnlock()
|
|
m.metrics.CacheLength.Set(float64(length))
|
|
}
|