/// <summary>
/// Gets some requests to be send to a peer. The requests will not exceed <see cref="Distribox.CommonLib.Properties.MaxRequestSize"/>
/// </summary>
/// <returns>
/// The requests.
/// </returns>
public Tuple<List<FileEvent>, Peer> GetRequests()
{
CheckForRequestExpire();
lock (this)
{
// No requests
if (this.todoFileToPeer.Count() == 0)
{
return null;
}
Peer bestPeer = new Peer();
List<FileEvent> bestCollection = new List<FileEvent>();
double bestScore = 0;
long bestSize = 0;
// For each peer
foreach (KeyValuePair<Peer, List<FileEvent>> ppf in this.todoPeerToFile)
{
Peer peer = ppf.Key;
var slist = ppf.Value.OrderBy(x => x.When.Ticks).ToList();
// Find file collections
double score = Properties.RMBandwidthWeight * this.estimator.GetPeerBandwidth(peer);
long currentSize = 0;
List<FileEvent> currentCollection = new List<FileEvent>();
foreach (FileEvent f in slist)
{
if (currentSize + f.Size <= Properties.MaxRequestSize)
{
currentSize += f.Size;
currentCollection.Add(f);
double uniqueness = 1.0 / this.todoFileToPeer[f].Count();
score += Properties.RMUniquenessWeight * uniqueness;
}
else
{
break;
}
}
score += Properties.RMSizeWeight * currentSize;
// Update best solution
if (score > bestScore)
{
bestScore = score;
bestPeer = peer;
bestCollection = currentCollection;
bestSize = currentSize;
}
}
// Do we have enough bandwidth ?
int needBandwidth = this.estimator.GetPeerBandwidth(bestPeer);
if (needBandwidth == 0)
{
needBandwidth = Properties.DefaultConnectionSpeed;
}
if (usedBandwidth + needBandwidth > Properties.DefaultBandwidth)
{
return null;
}
// Do this!
Console.WriteLine("Request");
usedBandwidth += needBandwidth;
DoingQueueItem dqItem = new DoingQueueItem();
dqItem.bandWidth = needBandwidth;
dqItem.expireDate = DateTime.Now.AddSeconds(bestSize * Properties.ExpireSlackCoefficient / needBandwidth + Properties.DefaultDelay);
dqItem.files = new List<DoingQueueFileItem>();
foreach (FileEvent file in bestCollection)
{
DoingQueueFileItem fileItem = new DoingQueueFileItem();
fileItem.file = file;
fileItem.whoHaveMe = this.todoFileToPeer[file];
// Remove File->Peer
this.todoFileToPeer.Remove(file);
// Remove Peer->File
foreach (Peer peer in fileItem.whoHaveMe)
{
this.todoPeerToFile[peer].Remove(file);
}
dqItem.files.Add(fileItem);
}
// Add it
dqItem.filesHash = CommonHelper.GetHashCode(bestCollection);
this.doing.Add(dqItem);
this.estimator.BeginRequest(bestPeer, dqItem.filesHash, (int)bestSize);
// return success
return new Tuple<List<FileEvent>,Peer>(bestCollection, bestPeer);
}
}
/// <summary>
/// Gets some requests to be send to a peer. The requests will not exceed <see cref="Distribox.CommonLib.Properties.MaxRequestSize"/>
/// </summary>
/// <returns>
/// The requests.
/// </returns>
public Tuple <List <FileEvent>, Peer> GetRequests()
{
CheckForRequestExpire();
lock (this)
{
// No requests
if (this.todoFileToPeer.Count() == 0)
{
return(null);
}
Peer bestPeer = new Peer();
List <FileEvent> bestCollection = new List <FileEvent>();
double bestScore = 0;
long bestSize = 0;
// For each peer
foreach (KeyValuePair <Peer, List <FileEvent> > ppf in this.todoPeerToFile)
{
Peer peer = ppf.Key;
var slist = ppf.Value.OrderBy(x => x.When.Ticks).ToList();
// Find file collections
double score = Properties.RMBandwidthWeight * this.estimator.GetPeerBandwidth(peer);
long currentSize = 0;
List <FileEvent> currentCollection = new List <FileEvent>();
foreach (FileEvent f in slist)
{
if (currentSize + f.Size <= Properties.MaxRequestSize)
{
currentSize += f.Size;
currentCollection.Add(f);
double uniqueness = 1.0 / this.todoFileToPeer[f].Count();
score += Properties.RMUniquenessWeight * uniqueness;
}
else
{
break;
}
}
score += Properties.RMSizeWeight * currentSize;
// Update best solution
if (score > bestScore)
{
bestScore = score;
bestPeer = peer;
bestCollection = currentCollection;
bestSize = currentSize;
}
}
// Do we have enough bandwidth ?
int needBandwidth = this.estimator.GetPeerBandwidth(bestPeer);
if (needBandwidth == 0)
{
needBandwidth = Properties.DefaultConnectionSpeed;
}
if (usedBandwidth + needBandwidth > Properties.DefaultBandwidth)
{
return(null);
}
// Do this!
Console.WriteLine("Request");
usedBandwidth += needBandwidth;
DoingQueueItem dqItem = new DoingQueueItem();
dqItem.bandWidth = needBandwidth;
dqItem.expireDate = DateTime.Now.AddSeconds(bestSize * Properties.ExpireSlackCoefficient / needBandwidth + Properties.DefaultDelay);
dqItem.files = new List <DoingQueueFileItem>();
foreach (FileEvent file in bestCollection)
{
DoingQueueFileItem fileItem = new DoingQueueFileItem();
fileItem.file = file;
fileItem.whoHaveMe = this.todoFileToPeer[file];
// Remove File->Peer
this.todoFileToPeer.Remove(file);
// Remove Peer->File
foreach (Peer peer in fileItem.whoHaveMe)
{
this.todoPeerToFile[peer].Remove(file);
}
dqItem.files.Add(fileItem);
}
// Add it
dqItem.filesHash = CommonHelper.GetHashCode(bestCollection);
this.doing.Add(dqItem);
this.estimator.BeginRequest(bestPeer, dqItem.filesHash, (int)bestSize);
// return success
return(new Tuple <List <FileEvent>, Peer>(bestCollection, bestPeer));
}
}