/// <summary>
/// Returns the current representative of the set this node is in.
/// Note that the representative is only accurate untl the next Union operation.
/// </summary>
public UnionFindNode Find()
{
if (!ReferenceEquals(_parent, this))
{
_parent = _parent.Find();
}
return(_parent);
}
/// <summary>
/// Determines whether or not this node and the other node are in the same set.
/// </summary>
public bool IsUnionedWith(UnionFindNode other)
{
if (other == null)
{
throw new ArgumentNullException("other");
}
return(ReferenceEquals(Find(), other.Find()));
}
//TODO: for testnet we only have a single chain, thus grouper only take care of txList in one chain (hence Process has chainId as parameter)
public async Task <Tuple <List <List <Transaction> >, Dictionary <Transaction, Exception> > > ProcessNaive(Hash chainId, List <Transaction> transactions)
{
var txResourceHandle = new Dictionary <Transaction, string>();
var failedTxs = new Dictionary <Transaction, Exception>();
if (transactions.Count == 0)
{
return(new Tuple <List <List <Transaction> >, Dictionary <Transaction, Exception> >(new List <List <Transaction> >(), failedTxs));
}
Dictionary <string, UnionFindNode> resourceUnionSet = new Dictionary <string, UnionFindNode>();
//set up the union find set as the representation of graph and the connected components will be the resulting groups
foreach (var tx in transactions)
{
UnionFindNode first = null;
List <string> resources;
try
{
resources = (await _resourceUsageDetectionService.GetResources(chainId, tx)).ToList();
}
catch (Exception e)
{
failedTxs.Add(tx, e);
continue;
}
//_logger.Debug(string.Format("tx {0} have resource [{1}]", tx.From, string.Join(" ||| ", resources)));
foreach (var resource in resources)
{
if (!resourceUnionSet.TryGetValue(resource, out var node))
{
node = new UnionFindNode();
resourceUnionSet.Add(resource, node);
}
if (first == null)
{
first = node;
txResourceHandle.Add(tx, resource);
}
else
{
node.Union(first);
}
}
}
Dictionary <int, List <Transaction> > grouped = new Dictionary <int, List <Transaction> >();
List <List <Transaction> > result = new List <List <Transaction> >();
foreach (var tx in transactions)
{
if (txResourceHandle.TryGetValue(tx, out var firstResource))
{
int nodeId = resourceUnionSet[firstResource].Find().NodeId;
if (!grouped.TryGetValue(nodeId, out var group))
{
group = new List <Transaction>();
grouped.Add(nodeId, group);
}
group.Add(tx);
}
else
{
if (!failedTxs.ContainsKey(tx))
{
//each "resource-free" transaction have its own group
result.Add(new List <Transaction>()
{
tx
});
}
}
}
result.AddRange(grouped.Values);
_logger?.Info(string.Format(
"Grouper on chainId \"{0}\" group [{1}] transactions into [{2}] groups with sizes [{3}], There are also {4} transactions failed retriving resource", chainId.DumpHex(),
transactions.Count, result.Count, string.Join(", ", result.Select(a => a.Count)), failedTxs.Count));
return(new Tuple <List <List <Transaction> >, Dictionary <Transaction, Exception> >(result, failedTxs));;
}
/// <summary>
/// Creates a new disjoint node, representative of a set containing only the new node.
/// </summary>
public UnionFindNode()
{
_parent = this;
NodeId = Interlocked.Increment(ref _nextId);
}