memory: Use a string pool for Commands

socketserver/server/intern.go

@@ -0,0 +1,37 @@
+package server
+
+import (
+	"sync"
+)
+
+type StringPool struct {
+	sync.RWMutex
+	lookup map[string]Command
+}
+
+func NewStringPool() *StringPool {
+	return &StringPool{lookup: make(map[string]Command)}
+}
+
+// doesn't lock, doesn't check for dupes.
+func (p *StringPool) _Intern_Setup(s string) {
+	p.lookup[s] = Command(s)
+}
+
+func (p *StringPool) Intern(s string) Command {
+	p.RLock()
+	ss, exists := p.lookup[s]
+	p.RUnlock()
+	if exists {
+		return ss
+	}
+
+	p.Lock()
+	defer p.Unlock()
+	ss, exists = p.lookup[s]
+	if exists {
+		return ss
+	}
+	p.lookup[s] = Command(string([]byte(s)))
+	return s
+}