文件缓存自动加载热门数据时检查是否有足够的内存空间

internal/caches/storage_file.go

@@ -1156,11 +1156,16 @@ func (this *FileStorage) purgeLoop() {
 
 // 热点数据任务
 func (this *FileStorage) hotLoop() {
-	var memoryStorage = this.memoryStorage
+	var memoryStorage = this.memoryStorage // copy
 	if memoryStorage == nil {
 		return
 	}
 
+	// check memory space size
+	if !memoryStorage.HasFreeSpaceForHotItems() {
+		return
+	}
+
 	this.hotMapLocker.Lock()
 	if len(this.hotMap) == 0 {
 		this.hotMapLocker.Unlock()