Exemplo n.º 1
0
        public GraphBuilder(
            IEnumerable <ProjectGraphEntryPoint> entryPoints,
            ProjectCollection projectCollection,
            ProjectGraph.ProjectInstanceFactoryFunc projectInstanceFactory,
            ProjectInterpretation projectInterpretation,
            int degreeOfParallelism,
            CancellationToken cancellationToken)
        {
            var(actualEntryPoints, solutionDependencies) = ExpandSolutionIfPresent(entryPoints.ToImmutableArray());

            _solutionDependencies = solutionDependencies;

            _entryPointConfigurationMetadata = AddGraphBuildPropertyToEntryPoints(actualEntryPoints);

            IEqualityComparer <ConfigurationMetadata> configComparer = EqualityComparer <ConfigurationMetadata> .Default;

            _graphWorkSet = new ParallelWorkSet <ConfigurationMetadata, ParsedProject>(
                degreeOfParallelism - ImplicitWorkerCount,
                configComparer,
                cancellationToken);

            _projectCollection      = projectCollection;
            _projectInstanceFactory = projectInstanceFactory;
            _projectInterpretation  = projectInterpretation;
        }
Exemplo n.º 2
0
        /// <remarks>
        ///     Maintain the state of each node (InProcess and Processed) to detect cycles.
        ///     Assumes edges have been added between nodes.
        ///     Returns false if cycles were detected.
        /// </remarks>
        private void DetectCycles(
            IReadOnlyCollection <ProjectGraphNode> entryPointNodes,
            ProjectInterpretation projectInterpretation,
            Dictionary <ConfigurationMetadata, ParsedProject> allParsedProjects)
        {
            var nodeStates = new Dictionary <ProjectGraphNode, NodeVisitationState>();

            foreach (var entryPointNode in entryPointNodes)
            {
                if (!nodeStates.ContainsKey(entryPointNode))
                {
                    VisitNode(entryPointNode, nodeStates);
                }
                else
                {
                    ErrorUtilities.VerifyThrow(
                        nodeStates[entryPointNode] == NodeVisitationState.Processed,
                        "entrypoints should get processed after a call to detect cycles");
                }
            }

            return;

            (bool success, List <string> projectsInCycle) VisitNode(
                ProjectGraphNode node,
                IDictionary <ProjectGraphNode, NodeVisitationState> nodeState)
            {
                nodeState[node] = NodeVisitationState.InProcess;

                foreach (var referenceNode in node.ProjectReferences)
                {
                    if (nodeState.TryGetValue(referenceNode, out var projectReferenceNodeState))
                    {
                        // Because this is a depth-first search, we should only encounter new nodes or nodes whose subgraph has been completely processed.
                        // If we encounter a node that is currently being processed(InProcess state), it must be one of the ancestors in a circular dependency.
                        if (projectReferenceNodeState == NodeVisitationState.InProcess)
                        {
                            if (node.Equals(referenceNode))
                            {
                                // the project being evaluated has a reference to itself
                                var selfReferencingProjectString =
                                    FormatCircularDependencyError(new List <string> {
                                    node.ProjectInstance.FullPath, node.ProjectInstance.FullPath
                                });
                                throw new CircularDependencyException(
                                          string.Format(
                                              ResourceUtilities.GetResourceString("CircularDependencyInProjectGraph"),
                                              selfReferencingProjectString));
                            }

                            // the project being evaluated has a circular dependency involving multiple projects
                            // add this project to the list of projects involved in cycle
                            var projectsInCycle = new List <string> {
                                referenceNode.ProjectInstance.FullPath
                            };
                            return(false, projectsInCycle);
                        }
                    }
                    else
                    {
                        // recursively process newly discovered references
                        var loadReference = VisitNode(referenceNode, nodeState);
                        if (!loadReference.success)
                        {
                            if (loadReference.projectsInCycle[0].Equals(node.ProjectInstance.FullPath))
                            {
                                // we have reached the nth project in the cycle, form error message and throw
                                loadReference.projectsInCycle.Add(referenceNode.ProjectInstance.FullPath);
                                loadReference.projectsInCycle.Add(node.ProjectInstance.FullPath);

                                var errorMessage = FormatCircularDependencyError(loadReference.projectsInCycle);
                                throw new CircularDependencyException(
                                          string.Format(
                                              ResourceUtilities.GetResourceString("CircularDependencyInProjectGraph"),
                                              errorMessage));
                            }

                            // this is one of the projects in the circular dependency
                            // update the list of projects in cycle and return the list to the caller
                            loadReference.projectsInCycle.Add(referenceNode.ProjectInstance.FullPath);
                            return(false, loadReference.projectsInCycle);
                        }
                    }
                }

                nodeState[node] = NodeVisitationState.Processed;
                return(true, null);
            }
        }