private Information ConstructBlob()
{
if (this.lastFragmentIndex < 0)
{
return(null);
}
int totalSize = 0;
for (int i = 0; i <= this.lastFragmentIndex; i++)
{
BlobFragmentContract fragment = this.fragmentDictionary.Get(i);
if (fragment == null)
{
return(null);
}
totalSize += fragment.Fragment.Length;
}
byte[] blob = new byte[totalSize];
int offset = 0;
for (int i = 0; i <= this.lastFragmentIndex; i++)
{
BlobFragmentContract fragment = this.fragmentDictionary.Get(i);
Buffer.BlockCopy(fragment.Fragment, 0, blob, offset, fragment.Fragment.Length);
offset += fragment.Fragment.Length;
}
return(new Information(this.sourceID, this.destID, this.informationType, blob));
}
public Information Receive(string sourceID, string destID, BlobFragmentContract fragment)
{
if (fragment.BlobID == 1 && fragment.FragmentIndex == 0) //可能是掉线重新登录过
{
this.OnUserOffline(sourceID);
}
if (fragment.FragmentIndex == 0 && fragment.IsLast)
{
return(new Information(sourceID, destID, fragment.InformationType, fragment.Fragment));
}
string id = this.ConstructID(sourceID, fragment.BlobID);
Blob blob = this.blobManager.Get(id);
if (blob == null)
{
blob = new Blob(fragment.BlobID, sourceID, destID, fragment.InformationType);
this.blobManager.Add(id, blob);
}
Information info = blob.AddFragment(fragment);
if (info != null)
{
this.blobManager.Remove(id);
}
return(info);
}
public Information AddFragment(BlobFragmentContract fragment)
{
lock (this.locker)
{
if (fragment.IsLast)
{
this.lastFragmentIndex = fragment.FragmentIndex;
}
this.fragmentDictionary.Add(fragment.FragmentIndex, fragment);
return(this.ConstructBlob());
}
}
