add cache module

cache/cache.go

@@ -0,0 +1,39 @@
+package cache
+
+import (
+	"fmt"
+)
+
+type Cache interface {
+	Get(key string) interface{}
+	Put(key string, val interface{}, timeout int) error
+	Delete(key string) error
+	IsExist(key string) bool
+	ClearAll() error
+	StartAndGC(config string) error
+}
+
+var adapters = make(map[string]Cache)
+
+// Register makes a cache adapter available by the adapter name.
+// If Register is called twice with the same name or if driver is nil,
+// it panics.
+func Register(name string, adapter Cache) {
+	if adapter == nil {
+		panic("cache: Register adapter is nil")
+	}
+	if _, dup := adapters[name]; dup {
+		panic("cache: Register called twice for adapter " + name)
+	}
+	adapters[name] = adapter
+}
+
+//config is json {"interval":360} 
+func NewCache(adapterName, config string) (Cache, error) {
+	adapter, ok := adapters[adapterName]
+	if !ok {
+		return nil, fmt.Errorf("cache: unknown adaptername %q (forgotten import?)", adapterName)
+	}
+	adapter.StartAndGC(config)
+	return adapter, nil
+}