mirror of
https://github.com/prometheus/statsd_exporter.git
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0099df7f71
Signed-off-by: glightfoot <glightfoot@rsglab.com>
71 lines
1.3 KiB
Go
71 lines
1.3 KiB
Go
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/mapper_cache"
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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 *mapper_cache.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 := mapper_cache.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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