Initial euclide.org release

vendor/github.com/pyke369/golang-support/rcache/rcache.go

@@ -0,0 +1,38 @@
+package rcache
+
+import (
+	"regexp"
+	"sync"
+	"sync/atomic"
+)
+
+var (
+	cache map[string]*regexp.Regexp = map[string]*regexp.Regexp{}
+	hit   int64
+	miss  int64
+	lock  sync.RWMutex
+)
+
+func Get(expression string) *regexp.Regexp {
+	lock.RLock()
+	if cache[expression] != nil {
+		atomic.AddInt64(&hit, 1)
+		defer lock.RUnlock()
+		return cache[expression]
+	}
+	atomic.AddInt64(&miss, 1)
+	lock.RUnlock()
+	if regex, err := regexp.Compile(expression); err == nil {
+		lock.Lock()
+		defer lock.Unlock()
+		cache[expression] = regex
+		return cache[expression]
+	}
+	return nil
+}
+
+func Stats() (int, int64, int64) {
+	lock.RLock()
+	defer lock.RUnlock()
+	return len(cache), atomic.LoadInt64(&hit), atomic.LoadInt64(&miss)
+}