public void ApplyCustomList(IEventRoutingCustomList list, IServiceEventDependencyGraph dependencyGraph, Action <string> onConflict)
{
var subscriptionsByName = subscriptions.ToDictionary(x => x.Name);
subscriptions.Clear();
foreach (var subName in list.SubscriptionNames)
{
if (subscriptionsByName.TryGetValue(subName, out var sub))
{
subscriptions.Add(sub);
}
else
{
onConflict($"Subscription '{subName}' not found");
}
}
foreach (var subPair in subscriptions.AllPairs())
{
var comparisonResult = CompareSubscriptions(subPair.First, subPair.Second, dependencyGraph, out var dependencyString);
if (comparisonResult == SubscriptionDependencyComparisonResult.Contradicting)
{
onConflict($"Subscriptions '{subPair.First.Name}' and '{subPair.Second.Name}' are contradicting:\n{dependencyString}");
}
else if (comparisonResult == SubscriptionDependencyComparisonResult.FirstDependsOnSecond)
{
onConflict($"Subscription '{subPair.First.Name}' depends on '{subPair.Second.Name}', but comes first:\n{dependencyString}");
}
}
}
private static SubscriptionDependencyComparisonResult CompareSubscriptions(IRoutedEventSubscription sub1, IRoutedEventSubscription sub2,
IServiceEventDependencyGraph dependencyGraph, out string dependencyStrings)
{
var forwardDependencies = sub1.AffectedServiceTypes
.SelectMany(x => sub2.AffectedServiceTypes.Select(y => Tuples.SameTypePair(x, y)))
.Where(x => dependencyGraph.DependencyExists(x.First, x.Second))
.ToArray();
var backwardDependencies = sub1.AffectedServiceTypes
.SelectMany(x => sub2.AffectedServiceTypes.Select(y => Tuples.SameTypePair(x, y)))
.Where(x => dependencyGraph.DependencyExists(x.Second, x.First))
.ToArray();
var forwardLines = forwardDependencies.Select(x => $" {sub1.Name} ({x.First.Name}) -> ({x.Second.Name}) {sub2.Name}");
var backwardLines = forwardDependencies.Select(x => $" {sub1.Name} ({x.First.Name}) <- ({x.Second.Name}) {sub2.Name}");
dependencyStrings = string.Join("\n", forwardLines.Concat(backwardLines));
if (forwardDependencies.Length == 0 && backwardDependencies.Length == 0)
{
return(SubscriptionDependencyComparisonResult.Unrelated);
}
if (forwardDependencies.Length > 0 && backwardDependencies.Length == 0)
{
return(SubscriptionDependencyComparisonResult.FirstDependsOnSecond);
}
if (forwardDependencies.Length == 0 && backwardDependencies.Length > 0)
{
return(SubscriptionDependencyComparisonResult.SecondDependsOnFirst);
}
return(SubscriptionDependencyComparisonResult.Contradicting);
}
public bool TrySortSubscriptionsByDependencies(IServiceEventDependencyGraph dependencyGraph, out string contradictionString)
{
while (true)
{
var foundWrongOrder = false;
for (var i = 0; i < Subscriptions.Count - 1; i++)
{
for (var j = i + 1; j < Subscriptions.Count; j++)
{
var comparisonResult = CompareSubscriptions(Subscriptions[i], Subscriptions[j], dependencyGraph, out contradictionString);
if (comparisonResult == SubscriptionDependencyComparisonResult.Contradicting)
{
return(false);
}
if (comparisonResult != SubscriptionDependencyComparisonResult.FirstDependsOnSecond)
{
continue;
}
CodingHelper.Swap(subscriptions, i, j);
foundWrongOrder = true;
}
}
if (!foundWrongOrder)
{
break;
}
}
contradictionString = null;
return(true);
}
public EventRoutingService()
{
dependencyGraph = new ServiceEventDependencyGraph();
routers = new Dictionary <Type, IEventRouter>();
generalSubscriptionsBefore = new Dictionary <string, IGeneralRoutedEventSubscription>();
generalSubscriptionsAfter = new Dictionary <string, IGeneralRoutedEventSubscription>();
}