private void startDownload()
{
// Send Download command to server
CommandDownload dwn = (CommandDownload)cmd;
Console.WriteLine("DSH" + serverID + " Rozpoczeto download chunka " + dwnfrag + " od " + dwn.Begin + " do " + dwn.End);
cmdTrans.sendCmd(cmd);
Command recvd = cmdTrans.getCmd();
if (recvd.GetType().Equals(typeof(CommandChunk)))
{
// Pass the chunk to client
Console.WriteLine("DSH" + serverID + " Pobralem chunk " + dwnfrag + " o rozmiarze " + ((CommandChunk)recvd).Data.Length);
monitor.addDownloadChunk((CommandChunk)recvd, dwnfrag);
// Let scheduler know we succeeded
scheduler.success(dwnfrag);
scheduler.wakeSch();
}
else
{
Console.WriteLine("DSH: Unexpected server response during download: " + recvd.GetType());
scheduler.addFailed((CommandDownload)cmd);
scheduler.wakeSch();
}
}
private void startDownload(CommandDownload cmd)
{
currentClient = cmd.CmdProc;
lastFrag = 0;
int totalSize = cmd.End;
maxFrag = (totalSize + fragSizeDwn - 1) / fragSizeDwn; // Round up
monitor.setDownloadBuffer(fileBufferSize);
succFrags = new bool[maxFrag];
lastSucc = 0;
for (int i = 0; i < maxFrag; i++)
{
succFrags[i] = false;
}
CommandDownload dwn;
DataServerHandler server;
Console.WriteLine("SCH: Zaczynam Download");
while (!token.IsCancellationRequested)
{
// Wait for first idle DSH
server = avaibleServer();
if (token.IsCancellationRequested)
{
break;
}
if (failedFrags.Count > 0) // There are some fragments that need to be redownloaded
{
dwn = failedFrags.Take(token);
Console.WriteLine("SCH: Zfailowany fragment " + dwn.Begin);
server.addDownload(dwn, dwn.Begin / fragSizeDwn);
}
else if (lastFrag < maxFrag) // Not all fragments have been downloaded
{
if (lastFrag >= lastSucc + fileBufferSize)
{
Console.WriteLine("SCH: Czekam na pobranie " + lastSucc);
waitForDwn();
continue;
}
// Make new Download command for specific fragment and pass it to DSH
dwn = makeChunk(cmd, lastFrag);
Console.WriteLine("SCH: Zlecam nowy chunk " + lastFrag + " " + dwn.Begin + " " + dwn.End);
server.addDownload(dwn, lastFrag);
lastFrag++;
}
// All fragments have started downloading and no one failed yet,
// so check if they all succeeded
else if (allSucc())
{
Console.WriteLine("SCH: Pobieranie zakonczone");
break;
}
}
}
// add... methods - used by scheduler to pass Command and wake up DSH
public bool addDownload(CommandDownload _cmd, int fragment)
{
lock (cmdLock)
{
Console.WriteLine("DSH: Dodany download");
dwnfrag = fragment;
cmd = _cmd;
state = States.download;
Monitor.Pulse(cmdLock);
Console.WriteLine("DSH: Zpulsowano");
return(true);
}
}
private CommandDownload makeChunk(CommandDownload cmd, int frag)
{
// Make new Download command for one fragment
Console.WriteLine("SCH: Tworze nowy chunk " + frag);
CommandDownload newcmd = new CommandDownload(cmd);
newcmd.Begin = frag * fragSizeDwn;
newcmd.End = (frag + 1) * fragSizeDwn;
if (newcmd.Begin > cmd.End || newcmd.Begin < 0)
{
return(null);
}
if (newcmd.End > cmd.End)
{
newcmd.End = cmd.End;
}
Console.WriteLine("SCH: Chunk " + frag + " od " + newcmd.Begin + " do " + newcmd.End);
return(newcmd);
}
public void addFailed(CommandDownload cmd)
{
// Used by DSH to return a failed Download command
failedFrags.Add(cmd);
}
