public FileStat(FileMetaData metaData, bool present)
{
var size = metaData.Size;
var name = metaData.Name;
var server = metaData.Server;
HashOfBlock = metaData.BlockHashs;
locateInfos = new List <LocateInfo>();
Size = size;
BlockCount = (Size % 4096 == 0) ? Size / 4096 : (Size / 4096) + 1;
IfPrsent = new List <bool>(BlockCount);
for (int i = 0; i < BlockCount; ++i)
{
IfPrsent.Add(present);
}
Name = name;
Server = server;
FailBlock = new List <int>();
}
public void DownloadLoop(FileMetaData metaData)
{
var hash = metaData.Hash;
var blockCount = metaData.BlockCount;
fmanager.AddNewDownloadFile(metaData);
Queue <int> indexs = GenBlockQueue(metaData.BlockCount);
IPAddress lastDownLoc = metaData.Server;
int loopCount = 0;
while (indexs.Count != 0)
{
int count = 0;
// 调节下载速率的最重要参数，1为最小值（为0是不能下载的）。
const int MaxCount = 1;
List <int> download_list = new List <int>();
var index = indexs.Dequeue();
var ip = fmanager.GetConsultForDownload(hash, index);
download_list.Add(index);
count++;
while (count < MaxCount && indexs.Count != 0)
{
index = indexs.Dequeue();
if (fmanager.GetConsultForDownload(hash, index) == ip)
{
download_list.Add(index);
count++;
}
else
{
indexs.Enqueue(index);
break;
}
}
var d_list = download_list.Where((x) => (!fmanager.IfDownloadIndex(hash, x))).ToArray();
if (loopCount % 4 == 0)
{
try
{
RefreshFileInfo(lastDownLoc, hash);
}
catch (FailToConnectException e)
{
_logger.Warn(e);
}
}
else
{
}
/*
* 默认Server必须拥有所有的原始数据，如果FileManager推荐的地址下载失败，
* 到Server处下载，如果再次失败，记录这个文件块为失败的文件块。
*/
var failedThisTime = DownloadData(hash, d_list, ip);
if (failedThisTime.Count != 0)
{
failedThisTime = DownloadData(hash, failedThisTime.ToArray(), ip);
}
foreach (var i in failedThisTime)
{
fmanager.OnBlockDownloadFail(hash, i);
}
loopCount++;
}
var failed = fmanager.ProvideFailBlock(hash);
// 再次尝试下载失败的数据块
if (failed.Count != 0)
{
DownloadData(hash, failed.ToArray(), metaData.Server);
}
fmanager.OnDownloadComplete(metaData.Hash);
}
public void AddNewDownloadFile(FileMetaData metaData)
{
AddNewFile(metaData, false);
InitNewFile();
}
static FileMetaData ParseFromFile(string path)
{
var str = File.ReadAllText(path);
return(FileMetaData.Deserialize(str));
}
