/// <summary>
/// Gets the top level feature graphs, that is the graphs
/// for features that do not have a parent feature.
/// </summary>
/// <returns>
/// A collection of <see cref="FeatureGraph"/> instances representing
/// the dependency graphs for the unparented features.
/// </returns>
public async Task <IEnumerable <FeatureGraph> > GetTopLevelFeatureGraphsAsync()
{
var features = (await _featureManager.GetAllDbFeatures()).ToList();
var invocations = (await _analysisReportManager.GetAllDbInvocations()).ToList();
_logger.LogInformation("Calculating top level feature graphs for {FeatureCount} features and {InvocationCount} invocations.",
features.Count, invocations.Count);
var invocationFeatures = (from invocation in invocations
select new
{
Invocation = invocation,
Features = features.Where(f => f.DirectInvocationSignatures != null && f.DirectInvocationSignatures.Intersect(invocation.InvokedSignatures).Any()).ToList()
}).ToList();
var featuresInvocations = (from feature in features
select new
{
Feature = feature,
Invocations = invocationFeatures.Where(i => feature.DirectInvocationSignatures != null && feature.DirectInvocationSignatures.Contains(i.Invocation.Signature))
}).ToList();
var featureGraphs = new Dictionary <DbFeature, FeatureGraph>();
foreach (var feature in featuresInvocations)
{
var featureGraph = new FeatureGraph
{
FeatureName = feature.Feature.Title,
ProductName = feature.Feature.Product,
GroupName = feature.Feature.Group,
Tags = feature.Feature.Tags,
Version = feature.Feature.Version,
DependsOn = new List <FeatureGraph>()
};
featureGraphs.Add(feature.Feature, featureGraph);
}
var unparentedGraphs = new List <FeatureGraph>(featureGraphs.Values);
foreach (var feature in featuresInvocations)
{
var featureGraph = featureGraphs[feature.Feature];
var dependencies = feature.Invocations.SelectMany(i => i.Features).Select(f => featureGraphs[f]).ToList();
dependencies.ForEach(f => unparentedGraphs.Remove(f));
featureGraph.DependsOn.AddRange(dependencies.Distinct());
}
return(unparentedGraphs);
}
public async Task VerifyFeatureGraphsCanBeDiscovered()
{
// Arrange
var callingFeature = CreateDbFeature("CallingFeature", "SomeClass.Foo()");
var calledFeature = CreateDbFeature("CalledFeature", "SomeOtherClass.Bar()");
_featureManager.GetAllDbFeatures().Returns(new[] { callingFeature, calledFeature });
_analysisReportManager.GetAllDbInvocations().Returns(new DbInvocation[]
{
new DbInvocation()
{
Signature = "SomeClass.Foo()",
InvokedSignatures = new []
{
"SomeClass.Foo(System.String)",
"SomeOtherClass.Bar()"
}
},
new DbInvocation()
{
Signature = "SomeOtherClass.Bar()",
InvokedSignatures = new []
{
"SomeOtherClass.JuiceBar()"
}
}
});
// Act
var target = new DependencyManager(_featureManager, _analysisReportManager, _logger);
var graphs = (await target.GetTopLevelFeatureGraphsAsync()).ToList();
// Assert
graphs.Count.ShouldBe(1);
graphs[0].FeatureName.ShouldBe("CallingFeature");
graphs[0].DependsOn.Count.ShouldBe(1);
graphs[0].DependsOn[0].FeatureName.ShouldBe("CalledFeature");
}