Ejemplo n.º 1
0
        /// <summary>
        ///   Determines the effective <see cref="Activation" /> of the <paramref name="fault" /> when <paramref name="faults" /> should
        ///   be checked for criticality.
        /// </summary>
        protected Activation GetEffectiveActivation(Fault fault, FaultSet faults, Activation activation)
        {
            Assert.That(fault != null && fault.IsUsed, "Invalid fault.");

            if (SuppressedFaults.Contains(fault))
            {
                return(Activation.Suppressed);
            }

            if (ForcedFaults.Contains(fault))
            {
                return(Activation.Forced);
            }

            if (faults.Contains(fault))
            {
                return(activation);
            }

            return(Activation.Suppressed);
        }
Ejemplo n.º 2
0
            /// <summary>
            ///   Returns a string representation of the minimal critical fault sets.
            /// </summary>
            public override string ToString()
            {
                var builder    = new StringBuilder();
                var percentage = CheckedSets.Count / (float)(1 << Faults.Count()) * 100;

                builder.AppendLine();
                builder.AppendLine("=======================================================================");
                builder.AppendLine("=======      Deductive Cause Consequence Analysis: Results      =======");
                builder.AppendLine("=======================================================================");
                builder.AppendLine();

                if (Exceptions.Any())
                {
                    builder.AppendLine("*** Warning: Unhandled exceptions have been thrown during the analysis. ***");
                    builder.AppendLine();
                }

                if (!IsComplete)
                {
                    builder.AppendLine("*** Warning: Analysis might be incomplete; not all fault sets have been checked. ***");
                    builder.AppendLine();
                }

                Func <IEnumerable <Fault>, string> getFaultString =
                    faults => String.Join(", ", faults.Select(fault => fault.Name).OrderBy(name => name));

                builder.AppendFormat("Elapsed Time: {0}", Time);
                builder.AppendLine();
                builder.AppendFormat("Fault Count: {0}", Faults.Count());
                builder.AppendLine();
                builder.AppendFormat("Faults: {0}", getFaultString(Faults));
                builder.AppendLine();

                if (ForcedFaults.Any())
                {
                    builder.AppendFormat("Forced Faults: {0}", getFaultString(ForcedFaults));
                    builder.AppendLine();
                }

                if (SuppressedFaults.Any())
                {
                    builder.AppendFormat("Suppressed Faults: {0}", getFaultString(SuppressedFaults));
                    builder.AppendLine();
                }

                builder.AppendLine();

                builder.AppendFormat("Checked Fault Sets: {0} ({1:F0}% of all fault sets)", CheckedSets.Count, percentage);
                builder.AppendLine();

                builder.AppendFormat("Minimal Critical Sets: {0}", MinimalCriticalSets.Count);
                builder.AppendLine();
                builder.AppendLine();

                var i = 1;

                foreach (var criticalSet in MinimalCriticalSets)
                {
                    builder.AppendFormat("   ({1}) {{ {0} }}", String.Join(", ", criticalSet.Select(fault => fault.Name).OrderBy(name => name)), i++);

                    Exception e;
                    if (Exceptions.TryGetValue(criticalSet, out e))
                    {
                        builder.AppendLine();
                        builder.AppendFormat(
                            "    An unhandled exception of type {0} was thrown while checking the fault set: {1}",
                            e.GetType().FullName, e.Message);
                    }

                    builder.AppendLine();
                }

                return(builder.ToString());
            }
        /// <summary>
        ///   Returns a string representation of the minimal critical fault sets.
        /// </summary>
        public override string ToString()
        {
            var builder        = new StringBuilder();
            var percentage     = CheckedSetCount / (double)(1L << Faults.Count()) * 100;
            var cardinalitySum = MinimalCriticalSets.Sum(set => set.Count);
            var minimalSetCardinalityAverage = cardinalitySum == 0 ? 0 : cardinalitySum / (double)MinimalCriticalSets.Count;

            builder.AppendLine();
            builder.AppendLine("=======================================================================");
            builder.AppendLine("=======      Deductive Cause Consequence Analysis: Results      =======");
            builder.AppendLine("=======================================================================");
            builder.AppendLine();

            if (Exceptions.Any())
            {
                builder.AppendLine("*** Warning: Unhandled exceptions have been thrown during the analysis. ***");
                builder.AppendLine();
            }

            if (!IsComplete)
            {
                builder.AppendLine("*** Warning: Analysis might be incomplete; not all fault sets have been checked. ***");
                builder.AppendLine();
            }

            Func <IEnumerable <Fault>, string> getFaultString =
                faults => String.Join(", ", faults.Select(fault => fault.Name).OrderBy(name => name));

            builder.AppendLine($"Elapsed Time: {Time}");
            builder.AppendLine($"Fault Count: {Faults.Count()}");
            builder.AppendLine($"Faults: {getFaultString(Faults)}");

            if (ForcedFaults.Any())
            {
                builder.AppendLine($"Forced Faults: {getFaultString(ForcedFaults)}");
            }

            if (SuppressedFaults.Any())
            {
                builder.AppendLine($"Suppressed Faults: {getFaultString(SuppressedFaults)}");
            }

            builder.AppendLine();
            builder.AppendLine($"Checked Fault Sets: {CheckedSetCount} ({percentage:F0}% of all fault sets)");
            builder.AppendLine($"Minimal Critical Sets: {MinimalCriticalSets.Count}");
            builder.AppendLine($"Average Minimal Critical Set Cardinality: {minimalSetCardinalityAverage:F1}");
            builder.AppendLine();

            var i = 1;

            foreach (var criticalSet in MinimalCriticalSets)
            {
                builder.AppendFormat("   ({1}) {{ {0} }}", String.Join(", ", criticalSet.Select(fault => fault.Name).OrderBy(name => name)), i++);

                Exception e;
                if (Exceptions.TryGetValue(criticalSet, out e))
                {
                    builder.AppendLine();
                    builder.Append(
                        $"    An unhandled exception of type {e.GetType().FullName} was thrown while checking the fault set: {e.Message}");
                }

                builder.AppendLine();
            }

            var heuristicCount = Heuristics.Count();

            if (heuristicCount != 0)
            {
                builder.AppendLine();

                if (HeuristicSuggestionCount == 0)
                {
                    builder.AppendLine("No suggestions were made by the heuristics.");
                }
                else
                {
                    var nonTriviallyCritical         = HeuristicSuggestionCount - HeuristicNonTrivialSafeCount - HeuristicTrivialCount;
                    var percentageTrivial            = HeuristicTrivialCount / (double)(HeuristicSuggestionCount) * 100;
                    var percentageNonTrivialSafe     = HeuristicNonTrivialSafeCount / (double)(HeuristicSuggestionCount) * 100;
                    var percentageNonTrivialCritical = nonTriviallyCritical / (double)(HeuristicSuggestionCount) * 100;

                    builder.AppendLine($"Of {HeuristicSuggestionCount} fault sets suggested by {heuristicCount} heuristics");
                    builder.AppendLine($"    {HeuristicTrivialCount} ({percentageTrivial:F0}%) were trivially safe or trivially critical,");
                    builder.AppendLine($"    {HeuristicNonTrivialSafeCount} ({percentageNonTrivialSafe:F0}%) were non-trivially safe, and");
                    builder.AppendLine($"    {nonTriviallyCritical} ({percentageNonTrivialCritical:F0}%) were non-trivially critical.");
                    builder.AppendLine($"In total, {TrivialChecksCount} trivial checks were performed.");
                }
            }

            return(builder.ToString());
        }