private GraphLink GetOrCreateEventLink(GraphNode source, GraphNode target, EventInfo e)
{
GraphLink link = null;
lock (this.Inbox)
{
string label = this.GetEventLabel(e.Event);
var index = this.GetLinkIndex(source, target, label);
var category = GetEventCategory(e.Event);
link = this.Graph.GetOrCreateLink(source, target, index, label, category);
if (this.MergeEventLinks)
{
if (link.AddListAttribute("EventIds", e.Event) > 1)
{
link.Label = "*";
}
}
else
{
link.AddAttribute("EventId", e.Event);
if (e.HandlingState != null)
{
link.AddAttribute("HandledBy", e.HandlingState);
}
}
}
return(link);
}
/// <summary>
/// Return all events represented by this link.
/// </summary>
private static IEnumerable <string> GetEventIds(GraphLink link)
{
if (link.AttributeLists != null)
{
// a collapsed edge graph
if (link.AttributeLists.TryGetValue("EventIds", out HashSet <string> idList))
{
return(idList);
}
}
// a fully expanded edge graph has individual links for each event.
if (link.Attributes.TryGetValue("EventId", out string eventId))
{
return(new string[] { eventId });
}
return(Array.Empty <string>());
}
/// <summary>
/// Get existing link or create a new one connecting the given source and target nodes.
/// </summary>
/// <returns>The new link or the existing link if it was already defined.</returns>
public GraphLink GetOrCreateLink(GraphNode source, GraphNode target, int?index = null, string linkLabel = null, string category = null)
{
string key = source.Id + "->" + target.Id;
if (index.HasValue)
{
key += string.Format("({0})", index.Value);
}
if (!this.InternalLinks.TryGetValue(key, out GraphLink link))
{
link = new GraphLink(source, target, linkLabel, category);
if (index.HasValue)
{
link.Index = index.Value;
}
this.InternalLinks.Add(key, link);
}
return(link);
}
/// <summary>
/// Serialize the graph to DGML.
/// </summary>
public void WriteDgml(TextWriter writer, bool includeDefaultStyles)
{
writer.WriteLine("<DirectedGraph xmlns='{0}'>", DgmlNamespace);
writer.WriteLine(" <Nodes>");
if (this.InternalNodes != null)
{
List <string> nodes = new List <string>(this.InternalNodes.Keys);
nodes.Sort();
foreach (var id in nodes)
{
GraphNode node = this.InternalNodes[id];
writer.Write(" <Node Id='{0}'", node.Id);
if (!string.IsNullOrEmpty(node.Label))
{
writer.Write(" Label='{0}'", node.Label);
}
if (!string.IsNullOrEmpty(node.Category))
{
writer.Write(" Category='{0}'", node.Category);
}
node.WriteAttributes(writer);
writer.WriteLine("/>");
}
}
writer.WriteLine(" </Nodes>");
writer.WriteLine(" <Links>");
if (this.InternalLinks != null)
{
List <string> links = new List <string>(this.InternalLinks.Keys);
links.Sort();
foreach (var id in links)
{
GraphLink link = this.InternalLinks[id];
writer.Write(" <Link Source='{0}' Target='{1}'", link.Source.Id, link.Target.Id);
if (!string.IsNullOrEmpty(link.Label))
{
writer.Write(" Label='{0}'", link.Label);
}
if (!string.IsNullOrEmpty(link.Category))
{
writer.Write(" Category='{0}'", link.Category);
}
if (link.Index.HasValue)
{
writer.Write(" Index='{0}'", link.Index.Value);
}
link.WriteAttributes(writer);
writer.WriteLine("/>");
}
}
writer.WriteLine(" </Links>");
if (includeDefaultStyles)
{
writer.WriteLine(
@" <Styles>
<Style TargetType=""Node"" GroupLabel=""Error"" ValueLabel=""True"">
<Condition Expression=""HasCategory('Error')"" />
<Setter Property=""Background"" Value=""#FFC15656"" />
</Style>
<Style TargetType=""Node"" GroupLabel=""Actor"" ValueLabel=""True"">
<Condition Expression=""HasCategory('Actor')"" />
<Setter Property=""Background"" Value=""#FF57AC56"" />
</Style>
<Style TargetType=""Node"" GroupLabel=""Monitor"" ValueLabel=""True"">
<Condition Expression=""HasCategory('Monitor')"" />
<Setter Property=""Background"" Value=""#FF558FDA"" />
</Style>
<Style TargetType=""Link"" GroupLabel=""halt"" ValueLabel=""True"">
<Condition Expression=""HasCategory('halt')"" />
<Setter Property=""Stroke"" Value=""#FFFF6C6C"" />
<Setter Property=""StrokeDashArray"" Value=""4 2"" />
</Style>
<Style TargetType=""Link"" GroupLabel=""push"" ValueLabel=""True"">
<Condition Expression=""HasCategory('push')"" />
<Setter Property=""Stroke"" Value=""#FF7380F5"" />
<Setter Property=""StrokeDashArray"" Value=""4 2"" />
</Style>
<Style TargetType=""Link"" GroupLabel=""pop"" ValueLabel=""True"">
<Condition Expression=""HasCategory('pop')"" />
<Setter Property=""Stroke"" Value=""#FF7380F5"" />
<Setter Property=""StrokeDashArray"" Value=""4 2"" />
</Style>
</Styles>");
}
writer.WriteLine("</DirectedGraph>");
}