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How to use CachedDelegate class of Microsoft.Coyote.Actors package

Best Coyote code snippet using Microsoft.Coyote.Actors.CachedDelegate

Actor.cs

Source:Actor.cs

...61        private protected IEventQueue Inbox;62        /// <summary>63        /// Map from event types to cached action delegates.64        /// </summary>65        private protected readonly Dictionary<Type, CachedDelegate> ActionMap;66        /// <summary>67        /// Map that contains the active timers.68        /// </summary>69        private protected readonly Dictionary<TimerInfo, IActorTimer> Timers;70        /// <summary>71        /// The current status of the actor. It is marked volatile as72        /// the runtime can read it concurrently.73        /// </summary>74        private protected volatile Status CurrentStatus;75        /// <summary>76        /// Gets the name of the current state, if there is one.77        /// </summary>78        internal string CurrentStateName { get; private protected set; }79        /// <summary>80        /// True if the event handler of the actor is running, else false.81        /// </summary>82        internal bool IsEventHandlerRunning { get; set; }83        /// <summary>84        /// Checks if the actor is halted.85        /// </summary>86        internal bool IsHalted => this.CurrentStatus is Status.Halted;87        /// <summary>88        /// The <see cref="EventGroup"/> currently associated with the actor, if any.89        /// </summary>90        internal EventGroup EventGroup { get; private set; }91        /// <summary>92        /// An optional <see cref="EventGroup"/> associated with the current event being handled.93        /// </summary>94        /// <remarks>95        /// This is an optional argument provided to <see cref="IActorRuntime.CreateActor(ActorId, Type, Event, EventGroup)"/>96        /// or <see cref="IActorRuntime.SendEvent(ActorId, Event, EventGroup, SendOptions)"/>.97        /// </remarks>98        public EventGroup CurrentEventGroup99        {100            get => this.EventGroup == EventGroup.Null ? null : this.EventGroup;101            set102            {103                this.EventGroup = value;104            }105        }106        /// <summary>107        /// The logger installed to the runtime.108        /// </summary>109        /// <remarks>110        /// See <see href="/coyote/concepts/actors/logging" >Logging</see> for more information.111        /// </remarks>112        protected ILogger Logger => this.Context.Logger;113        /// <summary>114        /// User-defined hashed state of the actor. Override to improve the115        /// accuracy of stateful techniques during testing.116        /// </summary>117        protected virtual int HashedState => 0;118        /// <summary>119        /// Initializes a new instance of the <see cref="Actor"/> class.120        /// </summary>121        protected Actor()122        {123            this.ActionMap = new Dictionary<Type, CachedDelegate>();124            this.Timers = new Dictionary<TimerInfo, IActorTimer>();125            this.CurrentStatus = Status.Active;126            this.CurrentStateName = default;127            this.IsEventHandlerRunning = true;128        }129        /// <summary>130        /// Configures the actor.131        /// </summary>132        internal void Configure(ActorExecutionContext context, ActorId id, ActorOperation op, IEventQueue inbox, EventGroup eventGroup)133        {134            this.Context = context;135            this.Id = id;136            this.Operation = op;137            this.Inbox = inbox;138            this.EventGroup = eventGroup;139        }140        /// <summary>141        /// Initializes the actor with the specified optional event.142        /// </summary>143        /// <param name="initialEvent">Optional event used for initialization.</param>144        internal virtual async Task InitializeAsync(Event initialEvent)145        {146            // Invoke the custom initializer, if there is one.147            await this.InvokeUserCallbackAsync(UserCallbackType.OnInitialize, initialEvent);148            if (this.CurrentStatus is Status.Halting)149            {150                await this.HaltAsync(initialEvent);151            }152        }153        /// <summary>154        /// Creates a new actor of the specified type and with the specified optional155        /// <see cref="Event"/>. This <see cref="Event"/> can only be used to access156        /// its payload, and cannot be handled.157        /// </summary>158        /// <param name="type">Type of the actor.</param>159        /// <param name="initialEvent">Optional initialization event.</param>160        /// <param name="eventGroup">An optional event group associated with the new Actor.</param>161        /// <returns>The unique actor id.</returns>162        protected ActorId CreateActor(Type type, Event initialEvent = null, EventGroup eventGroup = null) =>163            this.Context.CreateActor(null, type, null, initialEvent, this, eventGroup);164        /// <summary>165        /// Creates a new actor of the specified type and name, and with the specified166        /// optional <see cref="Event"/>. This <see cref="Event"/> can only be used to167        /// access its payload, and cannot be handled.168        /// </summary>169        /// <param name="type">Type of the actor.</param>170        /// <param name="name">Optional name used for logging.</param>171        /// <param name="initialEvent">Optional initialization event.</param>172        /// <param name="eventGroup">An optional event group associated with the new Actor.</param>173        /// <returns>The unique actor id.</returns>174        protected ActorId CreateActor(Type type, string name, Event initialEvent = null, EventGroup eventGroup = null) =>175            this.Context.CreateActor(null, type, name, initialEvent, this, eventGroup);176        /// <summary>177        /// Creates a new actor of the specified <see cref="Type"/> and name, using the specified178        /// unbound actor id, and passes the specified optional <see cref="Event"/>. This event179        /// can only be used to access its payload, and cannot be handled.180        /// </summary>181        /// <param name="id">Unbound actor id.</param>182        /// <param name="type">Type of the actor.</param>183        /// <param name="name">Optional name used for logging.</param>184        /// <param name="initialEvent">Optional initialization event.</param>185        /// <param name="eventGroup">An optional event group associated with the new Actor.</param>186        protected void CreateActor(ActorId id, Type type, string name, Event initialEvent = null, EventGroup eventGroup = null) =>187            this.Context.CreateActor(id, type, name, initialEvent, this, eventGroup);188        /// <summary>189        /// Sends an asynchronous <see cref="Event"/> to a target.190        /// </summary>191        /// <param name="id">The id of the target.</param>192        /// <param name="e">The event to send.</param>193        /// <param name="eventGroup">An optional event group associated with this Actor.</param>194        /// <param name="options">Optional configuration of a send operation.</param>195        protected void SendEvent(ActorId id, Event e, EventGroup eventGroup = null, SendOptions options = null) =>196            this.Context.SendEvent(id, e, this, eventGroup, options);197        /// <summary>198        /// Waits to receive an <see cref="Event"/> of the specified type199        /// that satisfies an optional predicate.200        /// </summary>201        /// <param name="eventType">The event type.</param>202        /// <param name="predicate">The optional predicate.</param>203        /// <returns>The received event.</returns>204        protected internal Task<Event> ReceiveEventAsync(Type eventType, Func<Event, bool> predicate = null)205        {206            this.Assert(this.CurrentStatus is Status.Active, "{0} invoked ReceiveEventAsync while halting.", this.Id);207            this.OnReceiveInvoked();208            return this.Inbox.ReceiveEventAsync(eventType, predicate);209        }210        /// <summary>211        /// Waits to receive an <see cref="Event"/> of the specified types.212        /// </summary>213        /// <param name="eventTypes">The event types to wait for.</param>214        /// <returns>The received event.</returns>215        protected internal Task<Event> ReceiveEventAsync(params Type[] eventTypes)216        {217            this.Assert(this.CurrentStatus is Status.Active, "{0} invoked ReceiveEventAsync while halting.", this.Id);218            this.OnReceiveInvoked();219            return this.Inbox.ReceiveEventAsync(eventTypes);220        }221        /// <summary>222        /// Waits to receive an <see cref="Event"/> of the specified types223        /// that satisfy the specified predicates.224        /// </summary>225        /// <param name="events">Event types and predicates.</param>226        /// <returns>The received event.</returns>227        protected internal Task<Event> ReceiveEventAsync(params Tuple<Type, Func<Event, bool>>[] events)228        {229            this.Assert(this.CurrentStatus is Status.Active, "{0} invoked ReceiveEventAsync while halting.", this.Id);230            this.OnReceiveInvoked();231            return this.Inbox.ReceiveEventAsync(events);232        }233        /// <summary>234        /// Starts a timer that sends a <see cref="TimerElapsedEvent"/> to this actor after the235        /// specified due time. The timer accepts an optional payload to be used during timeout.236        /// The timer is automatically disposed after it timeouts. To manually stop and dispose237        /// the timer, invoke the <see cref="StopTimer"/> method.238        /// </summary>239        /// <remarks>240        /// See <see href="/coyote/concepts/actors/timers">Using timers in actors</see> for more information.241        /// </remarks>242        /// <param name="startDelay">The amount of time to wait before sending the timeout event.</param>243        /// <param name="customEvent">Optional custom event to raise instead of the default TimerElapsedEvent.</param>244        /// <returns>Handle that contains information about the timer.</returns>245        protected TimerInfo StartTimer(TimeSpan startDelay, TimerElapsedEvent customEvent = null)246        {247            // The specified due time and period must be valid.248            this.Assert(startDelay.TotalMilliseconds >= 0, "{0} registered a timer with a negative due time.", this.Id);249            return this.RegisterTimer(startDelay, Timeout.InfiniteTimeSpan, customEvent);250        }251        /// <summary>252        /// Starts a periodic timer that sends a <see cref="TimerElapsedEvent"/> to this actor after253        /// the specified due time, and then repeats after each specified period. The timer accepts254        /// an optional payload to be used during timeout. The timer can be stopped by invoking the255        /// <see cref="StopTimer"/> method.256        /// </summary>257        /// <remarks>258        /// See <see href="/coyote/concepts/actors/timers">Using timers in actors</see> for more information.259        /// </remarks>260        /// <param name="startDelay">The amount of time to wait before sending the first timeout event.</param>261        /// <param name="period">The time interval between timeout events.</param>262        /// <param name="customEvent">Optional custom event to raise instead of the default TimerElapsedEvent.</param>263        /// <returns>Handle that contains information about the timer.</returns>264        protected TimerInfo StartPeriodicTimer(TimeSpan startDelay, TimeSpan period, TimerElapsedEvent customEvent = null)265        {266            // The specified due time and period must be valid.267            this.Assert(startDelay.TotalMilliseconds >= 0, "{0} registered a periodic timer with a negative due time.", this.Id);268            this.Assert(period.TotalMilliseconds >= 0, "{0} registered a periodic timer with a negative period.", this.Id);269            return this.RegisterTimer(startDelay, period, customEvent);270        }271        /// <summary>272        /// Stops and disposes the specified timer.273        /// </summary>274        /// <remarks>275        /// See <see href="/coyote/concepts/actors/timers">Using timers in actors</see> for more information.276        /// </remarks>277        /// <param name="info">Handle that contains information about the timer.</param>278        protected void StopTimer(TimerInfo info)279        {280            this.Assert(info.OwnerId == this.Id, "{0} is not allowed to dispose timer '{1}', which is owned by {2}.",281                this.Id, info, info.OwnerId);282            this.UnregisterTimer(info);283        }284        /// <summary>285        /// Returns a nondeterministic boolean choice, that can be286        /// controlled during analysis or testing.287        /// </summary>288        /// <returns>The controlled nondeterministic choice.</returns>289        protected bool RandomBoolean() => this.Context.GetNondeterministicBooleanChoice(this.Id.Name, this.Id.Type);290        /// <summary>291        /// Returns a nondeterministic integer, that can be controlled during292        /// analysis or testing. The value is used to generate an integer in293        /// the range [0..maxValue).294        /// </summary>295        /// <param name="maxValue">The max value.</param>296        /// <returns>The controlled nondeterministic integer.</returns>297        protected int RandomInteger(int maxValue) =>298            this.Context.GetNondeterministicIntegerChoice(maxValue, this.Id.Name, this.Id.Type);299        /// <summary>300        /// Invokes the specified monitor with the specified <see cref="Event"/>.301        /// </summary>302        /// <typeparam name="T">Type of the monitor.</typeparam>303        /// <param name="e">Event to send to the monitor.</param>304        protected void Monitor<T>(Event e) => this.Monitor(typeof(T), e);305        /// <summary>306        /// Invokes the specified monitor with the specified event.307        /// </summary>308        /// <param name="type">Type of the monitor.</param>309        /// <param name="e">The event to send.</param>310        protected void Monitor(Type type, Event e)311        {312            this.Assert(e != null, "{0} is sending a null event.", this.Id);313            this.Context.InvokeMonitor(type, e, this.Id.Name, this.Id.Type, this.CurrentStateName);314        }315        /// <summary>316        /// Checks if the assertion holds, and if not, throws an <see cref="AssertionFailureException"/> exception.317        /// </summary>318        protected void Assert(bool predicate) => this.Context.Assert(predicate);319        /// <summary>320        /// Checks if the assertion holds, and if not, throws an <see cref="AssertionFailureException"/> exception.321        /// </summary>322        protected void Assert(bool predicate, string s, object arg0) => this.Context.Assert(predicate, s, arg0);323        /// <summary>324        /// Checks if the assertion holds, and if not, throws an <see cref="AssertionFailureException"/> exception.325        /// </summary>326        protected void Assert(bool predicate, string s, object arg0, object arg1) =>327            this.Context.Assert(predicate, s, arg0, arg1);328        /// <summary>329        /// Checks if the assertion holds, and if not, throws an <see cref="AssertionFailureException"/> exception.330        /// </summary>331        protected void Assert(bool predicate, string s, object arg0, object arg1, object arg2) =>332            this.Context.Assert(predicate, s, arg0, arg1, arg2);333        /// <summary>334        /// Checks if the assertion holds, and if not, throws an <see cref="AssertionFailureException"/> exception.335        /// </summary>336        protected void Assert(bool predicate, string s, params object[] args) =>337            this.Context.Assert(predicate, s, args);338        /// <summary>339        /// Raises a <see cref='HaltEvent'/> to halt the actor at the end of the current action.340        /// </summary>341        protected void RaiseHaltEvent()342        {343            this.Assert(this.CurrentStatus is Status.Active, "{0} invoked Halt while halting.", this.Id);344            this.CurrentStatus = Status.Halting;345        }346        /// <summary>347        /// Asynchronous callback that is invoked when the actor is initialized with an optional event.348        /// </summary>349        /// <param name="initialEvent">Optional event used for initialization.</param>350        /// <returns>Task that represents the asynchronous operation.</returns>351        protected virtual Task OnInitializeAsync(Event initialEvent) => Task.CompletedTask;352        /// <summary>353        /// Asynchronous callback that is invoked when the actor successfully dequeues an event from its inbox.354        /// This method is not called when the dequeue happens via a receive statement.355        /// </summary>356        /// <param name="e">The event that was dequeued.</param>357        protected virtual Task OnEventDequeuedAsync(Event e) => Task.CompletedTask;358        /// <summary>359        /// Callback that is invoked when the actor ignores an event and removes it from its inbox.360        /// </summary>361        /// <param name="e">The event that was ignored.</param>362        protected virtual void OnEventIgnored(Event e)363        {364        }365        /// <summary>366        /// Callback that is invoked when the actor defers dequeing an event from its inbox.367        /// </summary>368        /// <param name="e">The event that was deferred.</param>369        protected virtual void OnEventDeferred(Event e)370        {371        }372        /// <summary>373        /// Asynchronous callback that is invoked when the actor finishes handling a dequeued event, unless374        /// the handler of the dequeued event caused the actor to halt (either normally or due to an exception).375        /// The actor will either become idle or dequeue the next event from its inbox.376        /// </summary>377        /// <param name="e">The event that was handled.</param>378        protected virtual Task OnEventHandledAsync(Event e) => Task.CompletedTask;379        /// <summary>380        /// Asynchronous callback that is invoked when the actor receives an event that it is not381        /// prepared to handle. The callback is invoked first, after which the actor will necessarily382        /// throw an <see cref="UnhandledEventException"/>.383        /// </summary>384        /// <param name="e">The event that was unhandled.</param>385        /// <param name="state">The state when the event was dequeued.</param>386        protected virtual Task OnEventUnhandledAsync(Event e, string state) => Task.CompletedTask;387        /// <summary>388        /// Asynchronous callback that is invoked when the actor handles an exception.389        /// </summary>390        /// <param name="ex">The exception thrown by the actor.</param>391        /// <param name="e">The event being handled when the exception was thrown.</param>392        /// <returns>The action that the runtime should take.</returns>393        protected virtual Task OnExceptionHandledAsync(Exception ex, Event e) => Task.CompletedTask;394        /// <summary>395        /// Asynchronous callback that is invoked when the actor halts.396        /// </summary>397        /// <param name="e">The event being handled when the actor halted.</param>398        /// <returns>Task that represents the asynchronous operation.</returns>399        protected virtual Task OnHaltAsync(Event e) => Task.CompletedTask;400        /// <summary>401        /// Enqueues the specified event and its metadata.402        /// </summary>403        internal EnqueueStatus Enqueue(Event e, EventGroup eventGroup, EventInfo info)404        {405            if (this.CurrentStatus is Status.Halted)406            {407                return EnqueueStatus.Dropped;408            }409            return this.Inbox.Enqueue(e, eventGroup, info);410        }411        /// <summary>412        /// Runs the event handler. The handler terminates if there is no next413        /// event to process or if the actor has halted.414        /// </summary>415        internal async Task RunEventHandlerAsync()416        {417            bool isFreshDequeue = true;418            Event lastDequeuedEvent = null;419            DequeueStatus lastDequeueStatus = DequeueStatus.NoDequeue;420            try421            {422                while (this.CurrentStatus != Status.Halted && this.Context.IsRunning)423                {424                    (DequeueStatus status, Event e, EventGroup eventGroup, EventInfo info) = this.Inbox.Dequeue();425                    lastDequeueStatus = status;426                    if (eventGroup != null)427                    {428                        this.EventGroup = eventGroup;429                    }430                    if (status is DequeueStatus.Success)431                    {432                        // Notify the runtime for a new event to handle. This is only used433                        // during bug-finding and operation bounding, because the runtime434                        // has to schedule an actor when a new operation is dequeued.435                        this.Context.LogDequeuedEvent(this, e, info, isFreshDequeue);436                        await this.InvokeUserCallbackAsync(UserCallbackType.OnEventDequeued, e);437                        lastDequeuedEvent = e;438                    }439                    else if (status is DequeueStatus.Raised)440                    {441                        // Only supported by types (e.g. StateMachine) that allow442                        // the user to explicitly raise events.443                        this.Context.LogHandleRaisedEvent(this, e);444                    }445                    else if (status is DequeueStatus.Default)446                    {447                        this.Context.LogWriter.LogDefaultEventHandler(this.Id, this.CurrentStateName);448                        // If the default event was dequeued, then notify the runtime.449                        // This is only used during bug-finding, because the runtime must450                        // instrument a scheduling point between default event handlers.451                        this.Context.LogDefaultEventDequeued(this);452                    }453                    else if (status is DequeueStatus.Unavailable)454                    {455                        // Terminate the handler as there is no event available.456                        break;457                    }458                    if (e is TimerElapsedEvent timeoutEvent &&459                        timeoutEvent.Info.Period.TotalMilliseconds < 0)460                    {461                        // If the timer is not periodic, then dispose it.462                        this.UnregisterTimer(timeoutEvent.Info);463                    }464                    if (this.CurrentStatus is Status.Active)465                    {466                        // Handles the next event, if the actor is not halted.467                        await this.HandleEventAsync(e);468                    }469                    if (!this.Inbox.IsEventRaised && lastDequeuedEvent != null && this.CurrentStatus != Status.Halted)470                    {471                        // Inform the user that the actor handled the dequeued event.472                        await this.InvokeUserCallbackAsync(UserCallbackType.OnEventHandled, lastDequeuedEvent);473                        lastDequeuedEvent = null;474                    }475                    if (this.CurrentStatus is Status.Halting)476                    {477                        // If the current status is halting, then halt the actor.478                        await this.HaltAsync(e);479                    }480                    isFreshDequeue = false;481                }482            }483            finally484            {485                this.Context.LogEventHandlerTerminated(this, lastDequeueStatus);486            }487        }488        /// <summary>489        /// Handles the specified <see cref="Event"/>.490        /// </summary>491        private protected virtual async Task HandleEventAsync(Event e)492        {493            if (this.ActionMap.TryGetValue(e.GetType(), out CachedDelegate cachedAction) ||494                this.ActionMap.TryGetValue(typeof(WildCardEvent), out cachedAction))495            {496                this.Context.LogInvokedAction(this, cachedAction.MethodInfo, null, null);497                await this.InvokeActionAsync(cachedAction, e);498            }499            else if (e is HaltEvent)500            {501                // If it is the halt event, then change the actor status to halting.502                this.CurrentStatus = Status.Halting;503            }504            else505            {506                await this.InvokeUserCallbackAsync(UserCallbackType.OnEventUnhandled, e);507                if (this.CurrentStatus is Status.Active)508                {509                    // If the event cannot be handled then report an error, else halt gracefully.510                    var ex = new UnhandledEventException(e, default, "Unhandled Event");511                    bool isHalting = this.OnUnhandledEventExceptionHandler(ex, e);512                    this.Assert(isHalting, "{0} received event '{1}' that cannot be handled.",513                        this.Id, e.GetType().FullName);514                }515            }516        }517        /// <summary>518        /// Invokes the specified action delegate.519        /// </summary>520        private protected async Task InvokeActionAsync(CachedDelegate cachedAction, Event e)521        {522            try523            {524                if (cachedAction.IsAsync)525                {526                    Task task = null;527                    if (cachedAction.Handler is Func<Event, Task> taskFuncWithEvent)528                    {529                        task = taskFuncWithEvent(e);530                    }531                    else if (cachedAction.Handler is Func<Task> taskFunc)532                    {533                        task = taskFunc();534                    }535                    this.OnWaitTask(task);536                    await task;537                }538                else if (cachedAction.Handler is Action<Event> actionWithEvent)539                {540                    actionWithEvent(e);541                }542                else if (cachedAction.Handler is Action action)543                {544                    action();545                }546            }547            catch (Exception ex) when (this.OnExceptionHandler(ex, cachedAction.MethodInfo.Name, e))548            {549                // User handled the exception.550                await this.OnExceptionHandledAsync(ex, e);551            }552            catch (Exception ex) when (!cachedAction.IsAsync && this.InvokeOnFailureExceptionFilter(cachedAction, ex))553            {554                // Use an exception filter to call OnFailure before the stack555                // has been unwound. If the exception filter does not fail-fast,556                // it returns false to process the exception normally.557            }558            catch (Exception ex)559            {560                await this.TryHandleActionInvocationExceptionAsync(ex, cachedAction.MethodInfo.Name);561            }562        }563        /// <summary>564        /// Invokes the specified event handler user callback.565        /// </summary>566        private protected async Task InvokeUserCallbackAsync(string callbackType, Event e, string currentState = default)567        {568            try569            {570                Task task = null;571                if (callbackType is UserCallbackType.OnInitialize)572                {573                    task = this.OnInitializeAsync(e);574                }575                else if (callbackType is UserCallbackType.OnEventDequeued)576                {577                    task = this.OnEventDequeuedAsync(e);578                }579                else if (callbackType is UserCallbackType.OnEventHandled)580                {581                    task = this.OnEventHandledAsync(e);582                }583                else if (callbackType is UserCallbackType.OnEventUnhandled)584                {585                    task = this.OnEventUnhandledAsync(e, currentState);586                }587                this.OnWaitTask(task);588                await task;589            }590            catch (Exception ex) when (this.OnExceptionHandler(ex, callbackType, e))591            {592                // User handled the exception.593                await this.OnExceptionHandledAsync(ex, e);594            }595            catch (Exception ex)596            {597                // Reports the unhandled exception.598                await this.TryHandleActionInvocationExceptionAsync(ex, callbackType);599            }600        }601        /// <summary>602        /// An exception filter that calls <see cref="CoyoteRuntime.OnFailure"/>,603        /// which can choose to fast-fail the app to get a full dump.604        /// </summary>605        /// <param name="action">The action being executed when the failure occurred.</param>606        /// <param name="ex">The exception being tested.</param>607        private protected bool InvokeOnFailureExceptionFilter(CachedDelegate action, Exception ex)608        {609            // This is called within the exception filter so the stack has not yet been unwound.610            // If the call does not fail-fast, return false to process the exception normally.611            this.Context.RaiseOnFailureEvent(new ActionExceptionFilterException(action.MethodInfo.Name, ex));612            return false;613        }614        /// <summary>615        /// Tries to handle an exception thrown during an action invocation.616        /// </summary>617        private protected Task TryHandleActionInvocationExceptionAsync(Exception ex, string actionName)618        {619            Exception innerException = ex;620            while (innerException is TargetInvocationException)621            {622                innerException = innerException.InnerException;623            }624            if (innerException is AggregateException)625            {626                innerException = innerException.InnerException;627            }628            if (innerException.GetBaseException() is ThreadInterruptedException)629            {630                this.CurrentStatus = Status.Halted;631                Debug.WriteLine($"[coyote::warning] {innerException.GetType().Name} was thrown from {this.Id}.");632            }633            else634            {635                // Reports the unhandled exception.636                this.ReportUnhandledException(innerException, actionName);637            }638            return Task.CompletedTask;639        }640        /// <summary>641        /// Checks if the specified event is ignored.642        /// </summary>643        internal virtual bool IsEventIgnored(Event e) =>644            e is TimerElapsedEvent timeoutEvent && !this.Timers.ContainsKey(timeoutEvent.Info);645        /// <summary>646        /// Checks if the specified event is deferred.647        /// </summary>648        internal virtual bool IsEventDeferred(Event e) => false;649        /// <summary>650        /// Checks if there is a default handler installed.651        /// </summary>652        internal virtual bool IsDefaultHandlerInstalled() => false;653        /// <summary>654        /// Returns the hashed state of this actor.655        /// </summary>656        internal virtual int GetHashedState(SchedulingPolicy policy)657        {658            unchecked659            {660                var hash = 19;661                if (policy is SchedulingPolicy.Interleaving)662                {663                    hash = (hash * 31) + this.GetType().GetHashCode();664                    hash = (hash * 31) + this.Id.Value.GetHashCode();665                    hash = (hash * 31) + this.IsHalted.GetHashCode();666                    hash = (hash * 31) + this.IsEventHandlerRunning.GetHashCode();667                    hash = (hash * 31) + this.Context.GetActorProgramCounter(this.Id);668                    hash = (hash * 31) + this.Inbox.GetCachedState();669                }670                if (this.HashedState != 0)671                {672                    // Adds the user-defined hashed state.673                    hash = (hash * 31) + this.HashedState;674                }675                return hash;676            }677        }678        /// <summary>679        /// Registers a new timer using the specified configuration.680        /// </summary>681        private protected TimerInfo RegisterTimer(TimeSpan dueTime, TimeSpan period, TimerElapsedEvent customEvent)682        {683            var info = new TimerInfo(this.Id, dueTime, period, customEvent);684            var timer = this.Context.CreateActorTimer(info, this);685            this.Context.LogWriter.LogCreateTimer(info);686            this.Timers.Add(info, timer);687            return info;688        }689        /// <summary>690        /// Unregisters the specified timer.691        /// </summary>692        private protected void UnregisterTimer(TimerInfo info)693        {694            if (!this.Timers.TryGetValue(info, out IActorTimer timer))695            {696                this.Assert(info.OwnerId == this.Id, "Timer '{0}' is already disposed.", info);697            }698            this.Context.LogWriter.LogStopTimer(info);699            this.Timers.Remove(info);700            using (timer)701            {702                // sometimes timer can be null.703            }704        }705        /// <summary>706        /// Extracts user declarations and sets up the event handlers.707        /// </summary>708        internal virtual void SetupEventHandlers()709        {710            if (!ActionCache.ContainsKey(this.GetType()))711            {712                Stack<Type> actorTypes = new Stack<Type>();713                for (var actorType = this.GetType(); typeof(Actor).IsAssignableFrom(actorType); actorType = actorType.BaseType)714                {715                    actorTypes.Push(actorType);716                }717                // process base types in reverse order, so mosts derrived type is cached first.718                while (actorTypes.Count > 0)719                {720                    this.SetupEventHandlers(actorTypes.Pop());721                }722            }723            // Now we have all derrived types cached, we can build the combined action map for this type.724            for (var actorType = this.GetType(); typeof(Actor).IsAssignableFrom(actorType); actorType = actorType.BaseType)725            {726                // Populates the map of event handlers for this actor instance.727                foreach (var kvp in ActionCache[actorType])728                {729                    // use the most derrived action handler for a given event (ignoring any base handlers defined for the same event).730                    if (!this.ActionMap.ContainsKey(kvp.Key))731                    {732                        // MethodInfo.Invoke catches the exception to wrap it in a TargetInvocationException.733                        // This unwinds the stack before the ExecuteAction exception filter is invoked, so734                        // call through a delegate instead (which is also much faster than Invoke).735                        this.ActionMap.Add(kvp.Key, new CachedDelegate(kvp.Value, this));736                    }737                }738            }739        }740        private void SetupEventHandlers(Type actorType)741        {742            // If this type has not already been setup in the ActionCache, then we need to try and grab the ActionCacheLock743            // for this type.  First make sure we have one and only one lockable object for this type.744            object syncObject = ActionCacheLocks.GetOrAdd(actorType, _ => new object());745            // Locking this syncObject ensures only one thread enters the initialization code to update746            // the ActionCache for this specific Actor type.747            lock (syncObject)748            {749                if (ActionCache.ContainsKey(actorType))...

CachedDelegate.cs

Source:CachedDelegate.cs

...7{8    /// <summary>9    /// An actor delegate that has been cached to optimize performance of invocations.10    /// </summary>11    internal class CachedDelegate12    {13        internal readonly MethodInfo MethodInfo;14        internal readonly Delegate Handler;15        internal readonly bool IsAsync;16        internal CachedDelegate(MethodInfo method, object caller)17        {18            ParameterInfo[] parameters = method.GetParameters();19            if (parameters.Length is 1 && method.ReturnType == typeof(void))20            {21                this.Handler = Delegate.CreateDelegate(typeof(Action<Event>), caller, method);22                this.IsAsync = false;23            }24            else if (method.ReturnType == typeof(void))25            {26                this.Handler = Delegate.CreateDelegate(typeof(Action), caller, method);27                this.IsAsync = false;28            }29            else if (parameters.Length is 1 && method.ReturnType == typeof(Task))30            {...

CachedDelegate

Using AI Code Generation

1using Microsoft.Coyote.Actors;2using System;3using System.Collections.Generic;4using System.Linq;5using System.Text;6using System.Threading.Tasks;7{8    {9        static void Main(string[] args)10        {11            var cachedDelegate = new CachedDelegate<int, int>(MyFunction);12            int result = cachedDelegate.Invoke(1);13            Console.WriteLine(result);14            Console.ReadLine();15        }16        private static int MyFunction(int x)17        {18            return x + 1;19        }20    }21}

CachedDelegate

Using AI Code Generation

1using Microsoft.Coyote.Actors;2using System;3using System.Collections.Generic;4using System.Linq;5using System.Text;6using System.Threading.Tasks;7{8    {9        static void Main(string[] args)10        {11            var cachedDelegate = new CachedDelegate<int>(x => x * 2);12            var result = cachedDelegate.Invoke(10);13            Console.WriteLine(result);14        }15    }16}

CachedDelegate

Using AI Code Generation

1using System;2using Microsoft.Coyote.Actors;3using Microsoft.Coyote.Actors.Timers;4{5    {6        static void Main(string[] args)7        {8            var runtime = RuntimeFactory.Create();9            runtime.CreateActor(typeof(CachedDelegateExample));10            runtime.Run();11        }12    }13    {14        private int counter = 0;15        protected override async Task OnInitializeAsync(Event initialEvent)16        {17            var timer = this.RegisterTimer(18                TimeSpan.FromSeconds(1),19                TimeSpan.FromSeconds(1));20            await this.ReceiveEventAsync(typeof(Halt));21            await timer.UnregisterAsync();22        }23        private void OnTimerCallback(object data)24        {25            Console.WriteLine("Counter: {0}", counter++);26        }27    }28}29using System;30using Microsoft.Coyote.Actors;31using Microsoft.Coyote.Actors.Timers;32{33    {34        static void Main(string[] args)35        {36            var runtime = RuntimeFactory.Create();37            runtime.CreateActor(typeof(CachedDelegateExample));38            runtime.Run();39        }40    }41    {42        private int counter = 0;43        protected override async Task OnInitializeAsync(Event initialEvent)44        {45            var timer = this.RegisterTimer(46                TimeSpan.FromSeconds(1),47                TimeSpan.FromSeconds(1));48            await this.ReceiveEventAsync(typeof(Halt));49            await timer.UnregisterAsync();50        }51        private void OnTimerCallback(object data)52        {53            Console.WriteLine("Counter: {0}", counter++);54        }55    }56}57using System;58using Microsoft.Coyote.Actors;59using Microsoft.Coyote.Actors.Timers;60{61    {62        static void Main(string[] args)63        {64            var runtime = RuntimeFactory.Create();65            runtime.CreateActor(typeof(CachedDelegateExample));66            runtime.Run();67        }68    }69    {70        private int counter = 0;71        protected override async Task OnInitializeAsync(Event initialEvent)

CachedDelegate

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Coyote.Actors;4{5    {6        static void Main(string[] args)7        {8            var cachedDelegate = new CachedDelegate();9            cachedDelegate.RunAsync().Wait();10        }11    }12    {13        public async Task RunAsync()14        {15            var actor = Actor.CreateFromTask(async (IActorRuntime runtime) =>16            {17                var actorId = runtime.CreateActor(typeof(Actor1));18                var actor1 = runtime.GetActorProxy(actorId);19                await actor1.SendEventAsync(new Event1());20            });21            await actor.WaitAsync();22        }23    }24    {25        protected override Task OnInitializeAsync(Event initialEvent)26        {27            this.Runtime.RegisterCachedDelegate(this.Id, "HandleEvent1", this.HandleEvent1);28            return Task.CompletedTask;29        }30        protected override Task OnEventAsync(Event e)31        {32            switch (e)33            {34                    this.Runtime.SendEvent(this.Id, "HandleEvent1", e);35                    break;36            }37            return Task.CompletedTask;38        }39        private Task HandleEvent1(Event e)40        {41            Console.WriteLine("Handled Event1");42            return Task.CompletedTask;43        }44    }45    {46    }47}48I just tried your example and it works for me. The only difference is that I used the latest version of Coyote (0.2.0-alpha.20200401.1), but I don't think that is the issue. Are you using the latest version of Coyote?49I am using the latest version of Coyote (0.2.0-alpha.20200401.1) and I am using Microsoft.Coyote.Actors package only. I am using Visual Studio

CachedDelegate

Using AI Code Generation

1using Microsoft.Coyote.Actors;2using System;3using System.Threading.Tasks;4using System.Collections.Generic;5using System.Linq;6{7    {8        static async Task Main(string[] args)9        {10            var actor = new Actor();11            var cachedDelegate = new CachedDelegate(actor, nameof(Actor.Foo));12            var result = await cachedDelegate.InvokeAsync(1);13            Console.WriteLine(result);14        }15    }16    {17        public Task<int> Foo(int x)18        {19            return Task.FromResult(x + 1);20        }21    }22}23using Microsoft.Coyote.Actors;24using System;25using System.Threading.Tasks;26using System.Collections.Generic;27using System.Linq;28{29    {30        static async Task Main(string[] args)31        {32            var actor = new Actor();33            var cachedDelegate = new CachedDelegate(actor.Foo);34            var result = await cachedDelegate.InvokeAsync(1);35            Console.WriteLine(result);36        }37    }38    {39        public Task<int> Foo(int x)40        {41            return Task.FromResult(x + 1);42        }43    }44}45using Microsoft.Coyote.Actors;46using System;47using System.Threading.Tasks;48using System.Collections.Generic;49using System.Linq;50{51    {52        static async Task Main(string[] args)53        {54            var actor = new Actor();55            var cachedDelegate = new CachedDelegate(actor.Foo);56            await cachedDelegate.InvokeAsync(1);57            Console.WriteLine("done");58        }59    }60    {

CachedDelegate

Using AI Code Generation

1{2    public static void Main()3    {4        var actor = new MyActor();5        actor.OnEvent(new MyEvent());6    }7}8{9    public static void Main()10    {11        var actor = new MyActor();12        actor.OnEvent(new MyEvent());13    }14}

CachedDelegate

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Coyote.Actors;4{5    {6        static void Main(string[] args)7        {8            ActorId actorId = ActorId.CreateRandom();9            ActorRuntime runtime = new ActorRuntime();10            runtime.RegisterActor(typeof(MyActor));11            runtime.CreateActor(typeof(MyActor), actorId);12            CachedDelegate cachedDelegate = new CachedDelegate(actorId, "MyMethod");13            Func<int, Task> myMethod = cachedDelegate.GetDelegate<Func<int, Task>>();14            myMethod(5).Wait();15        }16    }17    {18        [OnEventDoAction(typeof(UnitEvent), nameof(MyMethod))]19        private class Init : State { }20        private async Task MyMethod(Event e)21        {22            int i = (e as IntEvent).Value;23            await Task.Delay(1000);24            Console.WriteLine("MyMethod called with value " + i);25        }26    }27}28CachedDelegate cachedDelegate = new CachedDelegate(actorId, "MyMethod", typeof(int), typeof(string));

CachedDelegate

Using AI Code Generation

1using Microsoft.Coyote.Actors;2using System;3using System.Collections.Generic;4using System.Text;5{6    {7        public void TestMethod()8        {9            Console.WriteLine("Hello World");10        }11    }12    {13        public static void Main(string[] args)14        {15            TestClass t = new TestClass();16            CachedDelegate cd = new CachedDelegate(t, "TestMethod");17            cd.Invoke();18        }19    }20}21using Microsoft.Coyote.Actors;22using System;23using System.Collections.Generic;24using System.Text;25{26    {27        public void TestMethod()28        {29            Console.WriteLine("Hello World");30        }31    }32    {33        public static void Main(string[] args)34        {35            TestClass t = new TestClass();36            CachedDelegate cd = new CachedDelegate(t, "TestMethod");37            cd.Invoke();38        }39    }40}41using Microsoft.Coyote.Actors;42using System;43using System.Collections.Generic;44using System.Text;45{46    {47        public void TestMethod()48        {49            Console.WriteLine("Hello World");50        }51    }52    {53        public static void Main(string[] args)54        {55            TestClass t = new TestClass();56            CachedDelegate cd = new CachedDelegate(t, "TestMethod");57            cd.Invoke();58        }59    }60}61using Microsoft.Coyote.Actors;62using System;63using System.Collections.Generic;64using System.Text;65{

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