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Coyote
Microsoft.Coyote.Samples.CoffeeMachineTasks
AsyncLock

How to use AsyncLock class of Microsoft.Coyote.Samples.CoffeeMachineTasks package

Best Coyote code snippet using Microsoft.Coyote.Samples.CoffeeMachineTasks.AsyncLock

MockSensors.cs

Source:MockSensors.cs

...59    /// This is a mock implementation of the ISensor interface.60    /// </summary>61    internal class MockSensors : ISensors62    {63        private readonly AsyncLock Lock;64        private bool PowerOn;65        private bool WaterHeaterButton;66        private double WaterLevel;67        private double HopperLevel;68        private double WaterTemperature;69        private bool GrinderButton;70        private double PortaFilterCoffeeLevel;71        private bool ShotButton;72        private readonly bool DoorOpen;73        private readonly Generator RandomGenerator;74        private ControlledTimer WaterHeaterTimer;75        private ControlledTimer CoffeeLevelTimer;76        private ControlledTimer ShotTimer;77        public bool RunSlowly;78        private readonly LogWriter Log = LogWriter.Instance;79        public event EventHandler<double> WaterTemperatureChanged;80        public event EventHandler<bool> WaterHot;81        public event EventHandler<double> PortaFilterCoffeeLevelChanged;82        public event EventHandler<bool> HopperEmpty;83        public event EventHandler<bool> ShotComplete;84        public event EventHandler<bool> WaterEmpty;85        public MockSensors(bool runSlowly)86        {87            this.Lock = new AsyncLock();88            this.RunSlowly = runSlowly;89            this.RandomGenerator = Generator.Create();90            // The use of randomness here makes this mock a more interesting test as it will91            // make sure the coffee machine handles these values correctly.92            this.WaterLevel = this.RandomGenerator.NextInteger(100);93            this.HopperLevel = this.RandomGenerator.NextInteger(100);94            this.WaterHeaterButton = false;95            this.WaterTemperature = this.RandomGenerator.NextInteger(50) + 30;96            this.GrinderButton = false;97            this.PortaFilterCoffeeLevel = 0;98            this.ShotButton = false;99            this.DoorOpen = this.RandomGenerator.NextInteger(5) is 0;100            this.WaterHeaterTimer = new ControlledTimer("WaterHeaterTimer", TimeSpan.FromSeconds(0.1), this.MonitorWaterTemperature);101        }102        public Task TerminateAsync()103        {104            StopTimer(this.WaterHeaterTimer);105            StopTimer(this.CoffeeLevelTimer);106            StopTimer(this.ShotTimer);107            return Task.CompletedTask;108        }109        public async Task<bool> GetPowerSwitchAsync()110        {111            // to model real async behavior we insert a delay here.112            await Task.Delay(1);113            return this.PowerOn;114        }115        public async Task<double> GetWaterLevelAsync()116        {117            await Task.Delay(1);118            return this.WaterLevel;119        }120        public async Task<double> GetHopperLevelAsync()121        {122            await Task.Delay(1);123            return this.HopperLevel;124        }125        public async Task<double> GetWaterTemperatureAsync()126        {127            await Task.Delay(1);128            return this.WaterTemperature;129        }130        public async Task<double> GetPortaFilterCoffeeLevelAsync()131        {132            await Task.Delay(1);133            return this.PortaFilterCoffeeLevel;134        }135        public async Task<bool> GetReadDoorOpenAsync()136        {137            await Task.Delay(1);138            return this.DoorOpen;139        }140        public async Task SetPowerSwitchAsync(bool value)141        {142            await Task.Delay(1);143            // NOTE: you should not use C# locks that interact with Tasks (like Task.Run) because144            // it can result in deadlocks, instead use the Coyote AsyncLock as follows.145            using (await this.Lock.AcquireAsync())146            {147                this.PowerOn = value;148                if (!this.PowerOn)149                {150                    // Master power override then also turns everything else off for safety!151                    this.WaterHeaterButton = false;152                    this.GrinderButton = false;153                    this.ShotButton = false;154                    StopTimer(this.CoffeeLevelTimer);155                    this.CoffeeLevelTimer = null;156                    StopTimer(this.ShotTimer);157                    this.ShotTimer = null;158                }...

AsyncLock.cs

Source:AsyncLock.cs

...11    /// take control of it and explore various interleavings. This is possible12    /// because the lock is implemented on top of a TaskCompletionSource, which13    /// Coyote knows how to rewrite and control during testing.14    /// </summary>15    public class AsyncLock16    {17        /// <summary>18        /// Queue of tasks awaiting to acquire the lock.19        /// </summary>20        protected readonly Queue<TaskCompletionSource<object>> Awaiters;21        /// <summary>22        /// True if the lock has been acquired, else false.23        /// </summary>24        protected internal bool IsAcquired { get; protected set; }25        /// <summary>26        /// Initializes a new instance of the <see cref="AsyncLock"/> class.27        /// </summary>28        public AsyncLock()29        {30            this.Awaiters = new Queue<TaskCompletionSource<object>>();31            this.IsAcquired = false;32        }33        /// <summary>34        /// Tries to acquire the lock asynchronously, and returns a task that completes35        /// when the lock has been acquired. The returned task contains a releaser that36        /// releases the lock when disposed. This is not a reentrant operation.37        /// </summary>38        public virtual async Task<Releaser> AcquireAsync()39        {40            TaskCompletionSource<object> awaiter;41            lock (this.Awaiters)42            {43                if (this.IsAcquired)44                {45                    awaiter = new TaskCompletionSource<object>();46                    this.Awaiters.Enqueue(awaiter);47                }48                else49                {50                    this.IsAcquired = true;51                    awaiter = null;52                }53            }54            if (awaiter != null)55            {56                await awaiter.Task;57            }58            return new Releaser(this);59        }60        /// <summary>61        /// Releases the lock.62        /// </summary>63        protected virtual void Release()64        {65            TaskCompletionSource<object> awaiter = null;66            lock (this.Awaiters)67            {68                if (this.Awaiters.Count > 0)69                {70                    awaiter = this.Awaiters.Dequeue();71                }72                else73                {74                    this.IsAcquired = false;75                }76            }77            awaiter?.SetResult(null);78        }79        /// <summary>80        /// Releases the acquired <see cref="AsyncLock"/> when disposed.81        /// </summary>82        public struct Releaser : IDisposable83        {84            /// <summary>85            /// The acquired lock.86            /// </summary>87            private readonly AsyncLock AsyncLock;88            /// <summary>89            /// Initializes a new instance of the <see cref="Releaser"/> struct.90            /// </summary>91            internal Releaser(AsyncLock asyncLock)92            {93                this.AsyncLock = asyncLock;94            }95            /// <summary>96            /// Releases the acquired lock.97            /// </summary>98            public void Dispose() => this.AsyncLock?.Release();99        }100    }101}...

AsyncLock

Using AI Code Generation

1using Microsoft.Coyote.Samples.CoffeeMachineTasks;2using System;3using System.Threading.Tasks;4{5    {6        static void Main(string[] args)7        {8            Console.WriteLine("Hello World!");9            AsyncLock asyncLock = new AsyncLock();10            asyncLock.LockAsync();11            asyncLock.Unlock();12        }13    }14}15using Microsoft.Coyote.Samples.CoffeeMachineTasks;16using System;17using System.Threading.Tasks;18{19    {20        static void Main(string[] args)21        {22            Console.WriteLine("Hello World!");23            AsyncLock asyncLock = new AsyncLock();24            asyncLock.LockAsync();25            asyncLock.Unlock();26        }27    }28}29using Microsoft.Coyote.Samples.CoffeeMachineTasks;30using System;31using System.Threading.Tasks;32{33    {34        static void Main(string[] args)35        {36            Console.WriteLine("Hello World!");37            AsyncLock asyncLock = new AsyncLock();38            asyncLock.LockAsync();39            asyncLock.Unlock();40        }41    }42}43using Microsoft.Coyote.Samples.CoffeeMachineTasks;44using System;45using System.Threading.Tasks;46{47    {48        static void Main(string[] args)49        {50            Console.WriteLine("Hello World!");51            AsyncLock asyncLock = new AsyncLock();52            asyncLock.LockAsync();53            asyncLock.Unlock();54        }55    }56}57using Microsoft.Coyote.Samples.CoffeeMachineTasks;58using System;59using System.Threading.Tasks;60{61    {62        static void Main(string[] args)63        {64            Console.WriteLine("Hello World!");65            AsyncLock asyncLock = new AsyncLock();66            asyncLock.LockAsync();67            asyncLock.Unlock();68        }69    }70}

AsyncLock

Using AI Code Generation

1using System;2using System.Threading;3using System.Threading.Tasks;4using Microsoft.Coyote.Samples.CoffeeMachineTasks;5{6    {7        static void Main(string[] args)8        {9            var asyncLock = new AsyncLock();10            var task1 = Task.Run(async () =>11            {12                using (await asyncLock.LockAsync())13                {14                    Console.WriteLine("Task 1 acquired the lock");15                    await Task.Delay(1000);16                }17            });18            var task2 = Task.Run(async () =>19            {20                using (await asyncLock.LockAsync())21                {22                    Console.WriteLine("Task 2 acquired the lock");23                    await Task.Delay(1000);24                }25            });26            Task.WhenAll(task1, task2).Wait();27        }28    }29}301:  using  System;312:  using  System.Threading;323:  using  System.Threading.Tasks;336:  {348:      {359:           private   readonly  SemaphoreSlim _semaphore =  new  SemaphoreSlim(1, 1);3610:          private  Task<IDisposable> _releaser;3712:           public  AsyncLock()3813:          {3914:              _releaser = Task.FromResult( (IDisposable)  new  Releaser(this));4015:          }4117:           public  Task<IDisposable> LockAsync()4218:          {4319:               var  wait = _semaphore.WaitAsync();4422:                  wait.ContinueWith( (_, state) => (IDisposable)state,4524:                      TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);4625:          }

AsyncLock

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Coyote;4using Microsoft.Coyote.Tasks;5using Microsoft.Coyote.Samples.CoffeeMachineTasks;6{7    {8        static async Task Main(string[] args)9        {10            var machine = new CoffeeMachine();11            await machine.Start();12            var result = await machine.MakeCoffeeAsync();13            Console.WriteLine(result);14        }15    }16}17using System;18using System.Threading.Tasks;19using Microsoft.Coyote;20using Microsoft.Coyote.Tasks;21using Microsoft.Coyote.Samples.CoffeeMachineTasks;22{23    {24        static async Task Main(string[] args)25        {26            var machine = new CoffeeMachine();27            await machine.Start();28            var result = await machine.MakeCoffeeAsync();29            Console.WriteLine(result);30        }31    }32}33using System;34using System.Threading.Tasks;35using Microsoft.Coyote;36using Microsoft.Coyote.Tasks;37using Microsoft.Coyote.Samples.CoffeeMachineTasks;38{39    {40        static async Task Main(string[] args)41        {42            var machine = new CoffeeMachine();43            await machine.Start();44            var result = await machine.MakeCoffeeAsync();45            Console.WriteLine(result);46        }47    }48}49using System;50using System.Threading.Tasks;51using Microsoft.Coyote;52using Microsoft.Coyote.Tasks;53using Microsoft.Coyote.Samples.CoffeeMachineTasks;54{55    {56        static async Task Main(string[] args)57        {58            var machine = new CoffeeMachine();59            await machine.Start();60            var result = await machine.MakeCoffeeAsync();61            Console.WriteLine(result);62        }63    }64}65using System;66using System.Threading.Tasks;67using Microsoft.Coyote;68using Microsoft.Coyote.Tasks;

AsyncLock

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Coyote;4using Microsoft.Coyote.Tasks;5using Microsoft.Coyote.Samples.CoffeeMachineTasks;6{7    {8        public static void Main()9        {10            var machine = new CoffeeMachine();11            Task.Run(() => machine.RunAsync());12            var task = Task.Run(() => machine.WaitForReadyAsync());13            Console.WriteLine("Waiting for coffee machine to be ready...");14            task.Wait();15            Console.WriteLine("Coffee machine is ready!");16            task = Task.Run(() => machine.WaitForReadyAsync());17            Console.WriteLine("Waiting for coffee machine to be ready...");18            task.Wait();19            Console.WriteLine("Coffee machine is ready!");20            task = Task.Run(() => machine.WaitForReadyAsync());21            Console.WriteLine("Waiting for coffee machine to be ready...");22            task.Wait();23            Console.WriteLine("Coffee machine is ready!");24            task = Task.Run(() => machine.WaitForReadyAsync());25            Console.WriteLine("Waiting for coffee machine to be ready...");26            task.Wait();27            Console.WriteLine("Coffee machine is ready!");28            task = Task.Run(() => machine.WaitForReadyAsync());29            Console.WriteLine("Waiting for coffee machine to be ready...");30            task.Wait();31            Console.WriteLine("Coffee machine is ready!");32            Console.WriteLine("Done.");33            Console.ReadLine();34        }35    }36}37using System;38using System.Threading.Tasks;39using Microsoft.Coyote;40using Microsoft.Coyote.Tasks;41using Microsoft.Coyote.Samples.CoffeeMachineTasks;42{43    {44        public static void Main()45        {46            var machine = new CoffeeMachine();47            Task.Run(() => machine.RunAsync());48            var task = Task.Run(() => machine.WaitForReadyAsync());49            Console.WriteLine("Waiting for coffee machine to be ready...");50            task.Wait();51            Console.WriteLine("Coffee machine is ready!");

AsyncLock

Using AI Code Generation

1using Microsoft.Coyote.Samples.CoffeeMachineTasks;2using System;3using System.Threading.Tasks;4{5    {6        static void Main(string[] args)7        {8            var machine = new CoffeeMachine();9            var tasks = new Task[5];10            for (int i = 0; i < 5; i++)11            {12                tasks[i] = Task.Run(() => machine.MakeCoffee());13            }14            Task.WaitAll(tasks);15            Console.WriteLine("done");16            Console.ReadLine();17        }18    }19}

AsyncLock

Using AI Code Generation

1using Microsoft.Coyote.Tasks;2using System.Threading.Tasks;3{4    {5        private static AsyncLock asyncLock = new AsyncLock();6        static async Task Main(string[] args)7        {8            await Task.WhenAll(new Task[] { Task1(), Task2() });9        }10        private static async Task Task1()11        {12            using (await asyncLock.LockAsync())13            {14                await Task.Delay(1000);15            }16        }17        private static async Task Task2()18        {19            using (await asyncLock.LockAsync())20            {21                await Task.Delay(1000);22            }23        }24    }25}

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