IHttpHandler を介してファイルを転送しようとしています。コードは非常に単純です。ただし、単一の転送を開始すると、CPU の約 20% が使用されます。これを 20 の同時転送にスケーリングすると、CPU の使用率が非常に高くなります。CPUを低く保つためにこれを行うことができるより良い方法はありますか? クライアント コードは、一度に 64 KB のファイルのチャンクを送信するだけです。
public void ProcessRequest(HttpContext context)
{
if (context.Request.Params["secretKey"] == null)
{
}
else
{
accessCode = context.Request.Params["secretKey"].ToString();
}
if (accessCode == "test")
{
string fileName = context.Request.Params["fileName"].ToString();
byte[] buffer = Convert.FromBase64String(context.Request.Form["data"]);
string fileGuid = context.Request.Params["smGuid"].ToString();
string user = context.Request.Params["user"].ToString();
SaveFile(fileName, buffer, user);
}
}
public void SaveFile(string fileName, byte[] buffer, string user)
{
string DirPath = @"E:\Filestorage\" + user + @"\";
if (!Directory.Exists(DirPath))
{
Directory.CreateDirectory(DirPath);
}
string FilePath = @"E:\Filestorage\" + user + @"\" + fileName;
FileStream writer = new FileStream(FilePath, File.Exists(FilePath) ? FileMode.Append : FileMode.Create, FileAccess.Write, FileShare.ReadWrite);
writer.Write(buffer, 0, buffer.Length);
writer.Close();
}
ここに私のクライアントコードがあります:
//Set filename from object
string FileName;
FileName = System.IO.Path.GetFileName(pubAttFullPath.ToString());
//Open file
string file = System.IO.Path.GetFileName(pubAttFullPath.ToString());
FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
//Chunk size that will be sent to Server
int chunkSize = 65536;
// Unique file name
string fileName = smGuid.ToString() + "_" + FileName;
int totalChunks = (int)Math.Ceiling((double)fileStream.Length / chunkSize);
// Loop through the whole stream and send it chunk by chunk;
for (int i = 0; i < totalChunks; i++)
{
bool doRecieve = true;
int cpt = 0;
do
{
int startIndex = i * chunkSize;
int endIndex = (int)(startIndex + chunkSize > fileStream.Length ? fileStream.Length : startIndex + chunkSize);
int length = endIndex - startIndex;
byte[] bytes = new byte[length];
fileStream.Read(bytes, 0, bytes.Length);
//Request url, Method=post Length and data.
string requestURL = "http://localhost:16935/Transfer.doit";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(requestURL);
// Wait 5 min for answer before close connection.
request.Timeout = 300000;
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
// Chunk(buffer) is converted to Base64 string that will be convert to Bytes on the handler.
string requestParameters = @"fileName=" + fileName + @"&secretKey=test" + @"¤tChunk=" + i + @"&totalChunks=" + totalChunks + @"&smGuid=" + smGuid
+ "&user=" + userSID.ToString() +
"&data=" + HttpUtility.UrlEncode(Convert.ToBase64String(bytes));
// finally whole request will be converted to bytes that will be transferred to HttpHandler
byte[] byteData = Encoding.UTF8.GetBytes(requestParameters);
request.ContentLength = byteData.Length;
try
{
Stream writer = request.GetRequestStream();
writer.Write(byteData, 0, byteData.Length);
writer.Close();
// here we will receive the response from HttpHandler
StreamReader stIn = new StreamReader(request.GetResponse().GetResponseStream());
string strResponse = stIn.ReadToEnd();
stIn.Close();
doRecieve = true;
}
catch (WebException webException)
{
if (webException.Status == WebExceptionStatus.ConnectFailure ||
webException.Status == WebExceptionStatus.ConnectionClosed ||
webException.Status == WebExceptionStatus.ReceiveFailure ||
webException.Status == WebExceptionStatus.SendFailure ||
webException.Status == WebExceptionStatus.Timeout)
{
Thread.Sleep(5000);
doRecieve = false;
cpt++;
}
else {
// if the exception is not those ones then get out
doRecieve = true;
}
}
catch (Exception e)
{
doRecieve = true;
}
}
// will try to send 3 times the current chunk before quitting
// can't try it so try it and give me the feedback
while(doRecieve == false && cpt < 3);
}