public PeerHash Add(PeerHash peer, MetamineBlock request)
{
PeerHash previous = null;
MetamineReservation book;
if (byBlock.TryGetValue(request, out book))
{
previous = book.Peer;
}
byBlock[request] = new MetamineReservation
{
Peer = peer,
Expires = DateTime.Now.AddSeconds(30),
Request = request
};
if (byPeer.ContainsKey(peer) == false)
{
byPeer.Add(peer, new HashSet <MetamineReservation>());
}
byPeer[peer].Add(byBlock[request]);
return(previous);
}
public bool Contains(MetamineBlock request, PeerHash peer)
{
MetamineReservation book;
if (byBlock.TryGetValue(request, out book) == false)
{
return(false);
}
return(book.Peer.Equals(peer));
}
public bool Contains(MetamineBlock request, DateTime now)
{
MetamineReservation book;
if (byBlock.TryGetValue(request, out book) == false)
{
return(false);
}
return(book.Expires > now);
}
public void Complete(MetamineBlock request)
{
MetamineReservation block;
byBlock.TryGetValue(request, out block);
if (block != null)
{
byPeer[block.Peer].Remove(block);
byBlock.Remove(request);
}
}
public override IEnumerable <MetamineBlock> Next(MetamineStrategyContext context)
{
DateTime now = DateTime.Now;
int left = context.Configuration.Size;
for (int offset = 0; left > 0; offset += 16384, left -= 16384)
{
int size = Math.Min(left, 16384);
MetamineBlock block = new MetamineBlock(offset / 16384, size);
if (IsReservable(context, block, now))
{
yield return(block);
yield break;
}
}
}
private bool IsCompleted(MetamineStrategyContext context, MetamineBlock block)
{
return(context.Blocks.Contains(block));
}
private bool IsReserved(MetamineStrategyContext context, MetamineBlock block, DateTime now)
{
return(context.Reservations.Contains(block, now) ||
context.Reservations.Contains(block, context.Peer));
}
private bool IsReservable(MetamineStrategyContext context, MetamineBlock block, DateTime now)
{
return(IsCompleted(context, block) == false &&
IsReserved(context, block, now) == false &&
HasReservation(context) == false);
}
public void Complete(MetamineBlock block)
{
blocks.Complete(block);
reservations.Complete(block);
}
public PeerHash Reserve(PeerHash peer, MetamineBlock block)
{
return(reservations.Add(peer, block));
}
public void Complete(MetamineBlock block)
{
blocks.Add(block);
}
public bool Contains(MetamineBlock block)
{
return(blocks.Contains(block));
}