mostly finished db pages

pkg/cache/cache.go

@@ -0,0 +1,49 @@
+package cache
+
+import (
+	"sync"
+	"time"
+)
+
+type CachedPage struct {
+	Page      *Page
+	CacheTime time.Time
+}
+
+type Cache struct {
+	sync.RWMutex
+	Cache map[string]*CachedPage
+}
+
+func NewCache() *Cache {
+	return &Cache{Cache: make(map[string]*CachedPage)}
+}
+
+func (c *Cache) Add(title string, p *Page) {
+	now := time.Now()
+	c.Lock()
+	defer c.Unlock()
+	cp, ok := c.Cache[title]
+	if ok && now.After(c.CacheTime) {
+		cp.Page = p
+		cp.CacheTime = now
+		c.Cache[title] = cp
+		return
+	}
+	c.Cache[title] = &CachedPage{p, now}
+}
+
+func (c *Cache) Get(title string) *Page {
+	c.RLock()
+	defer c.RUnlock()
+	if cp, ok := c.Cache[title]; ok {
+		return cp.Page
+	}
+	return nil
+}
+
+func (c *Cache) Delete(title string) {
+	c.Lock()
+	delete(c.Cache, title)
+	c.Unlock()
+}