39 lines
701 B
Go
39 lines
701 B
Go
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package rcache
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import (
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"regexp"
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"sync"
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"sync/atomic"
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)
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var (
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cache map[string]*regexp.Regexp = map[string]*regexp.Regexp{}
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hit int64
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miss int64
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lock sync.RWMutex
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)
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func Get(expression string) *regexp.Regexp {
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lock.RLock()
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if cache[expression] != nil {
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atomic.AddInt64(&hit, 1)
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defer lock.RUnlock()
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return cache[expression]
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}
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atomic.AddInt64(&miss, 1)
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lock.RUnlock()
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if regex, err := regexp.Compile(expression); err == nil {
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lock.Lock()
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defer lock.Unlock()
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cache[expression] = regex
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return cache[expression]
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}
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return nil
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}
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func Stats() (int, int64, int64) {
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lock.RLock()
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defer lock.RUnlock()
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return len(cache), atomic.LoadInt64(&hit), atomic.LoadInt64(&miss)
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}
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