/// <summary>
/// ProjectContextChanged gets fired every time dependencies change for projects across solution.
/// <see cref="_expandedGraphContexts"/> contains all nodes that we need to check for potential updates
/// in their child dependencies.
/// </summary>
private void OnSnapshotChanged(object sender, SnapshotChangedEventArgs e)
{
IDependenciesSnapshot snapshot = e.Snapshot;
if (snapshot == null || e.Token.IsCancellationRequested)
{
return;
}
// _expandedGraphContexts remembers graph expanded or checked so far.
// Each context represents one level in the graph, i.e. a node and its first level dependencies
// Tracking changes over all expanded contexts ensures that all levels are processed
// and updated when there are any changes in nodes data.
lock (_lock)
{
foreach (IGraphContext graphContext in _expandedGraphContexts)
{
if (e.Token.IsCancellationRequested)
{
return;
}
bool anyChanges = false;
try
{
if (HandleChanges(graphContext))
{
anyChanges = true;
}
}
finally
{
// Calling OnCompleted ensures that the changes are reflected in UI
if (anyChanges)
{
graphContext.OnCompleted();
}
}
}
}
return;
bool HandleChanges(IGraphContext graphContext)
{
bool anyChanges = false;
foreach (GraphNode inputGraphNode in graphContext.InputNodes.ToList())
{
string existingDependencyId = inputGraphNode.GetValue <string>(DependenciesGraphSchema.DependencyIdProperty);
if (string.IsNullOrEmpty(existingDependencyId))
{
continue;
}
string nodeProjectPath = inputGraphNode.Id.GetValue(CodeGraphNodeIdName.Assembly);
if (string.IsNullOrEmpty(nodeProjectPath))
{
continue;
}
IDependenciesSnapshot updatedSnapshot = _aggregateSnapshotProvider.GetSnapshot(nodeProjectPath);
IDependency updatedDependency = updatedSnapshot?.FindDependency(existingDependencyId);
if (updatedDependency == null)
{
continue;
}
IDependenciesGraphViewProvider viewProvider = _viewProviders
.FirstOrDefaultValue((x, d) => x.SupportsDependency(d), updatedDependency);
if (viewProvider == null)
{
continue;
}
if (!viewProvider.ShouldApplyChanges(nodeProjectPath, snapshot.ProjectPath, updatedDependency))
{
continue;
}
using (var scope = new GraphTransactionScope())
{
if (viewProvider.ApplyChanges(
graphContext,
nodeProjectPath,
updatedDependency,
inputGraphNode,
updatedSnapshot.Targets[updatedDependency.TargetFramework]))
{
anyChanges = true;
}
scope.Complete();
}
}
return(anyChanges);
}
}
