event funk

ev.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using NPoco;
using NPoco.FluentMappings;
using Xunit;

namespace TechCompare
{
    public static class SystemTime
    {
        private static Func<DateTime> _utcNow;

        public static DateTime UtcNow
        {
            get
            {
                if (_utcNow == null)
                    _utcNow = () => DateTime.UtcNow;
                return _utcNow();
            }
            set
            {
                _utcNow = () => value;
            }
        }
    }


    public class TestWazoo
    {
        private readonly Database _database;
        private EventStore _eventStore;

        public TestWazoo()
        {
            var dbConfig = FluentMappingConfiguration.Scan(s =>
            {
                s.Assembly(Assembly.GetExecutingAssembly());
                s.TablesNamed(type => Inflector.AddUnderscores(type.Name));
                s.Columns.Named(memberInfo => Inflector.AddUnderscores(memberInfo.Name));
            });

            var factory = DatabaseFactory.Config(x =>
            {
                x.WithFluentConfig(dbConfig);
            });

            _database =
                factory.Build(new Database(
                    @"Data Source=.\SQL2014;Initial Catalog=techcompare;uid=sa;pwd=password;",
                    DatabaseType.SqlServer2012));

            var config = new EventStoreConfig
            {
                EventsPerSnapshot = 10
            };
            _eventStore = new EventStore(_database, config);
        }

        [Fact]
        public void LoadTest()
        {
            var motherBoard = _eventStore.Load<MotherBoard>(Guid.Parse("1ea61a8a-3080-4447-a853-ed690b5ec262"));
            //MotherBoard-
            Assert.Equal("mb", motherBoard.Name);
            Assert.Equal(64, motherBoard.MaxRam);
            Assert.Equal(8, motherBoard.RamSlots);

            motherBoard.ChangeSwitchConfig(true, false, true);
            Assert.True(motherBoard.OnBoardCmosSwitch);
        }

        [Fact]
        public void Test()
        {
            var brand = new Brand(Guid.NewGuid(), "brand");
            var socket = new Socket(Guid.NewGuid(), "socket", SocketSpecification.LGA2011);
            var chipset = new Chipset(Guid.NewGuid(), "chipset");

            var motherboard = MotherBoard.Create("mb", brand, socket, chipset, RamType.DDR3, MbProfile.ATX);
            motherboard.ChangeRamSlots(8);
            motherboard.ChangeMaxRam(64);
            _eventStore.AppendToStream(motherboard);
        }
    }

    public class EventStoreConfig
    {
        public int EventsPerSnapshot { get; set; }
    }

    public class EventStore
    {
        private readonly IDatabase _db;
        private readonly EventStoreConfig _config;

        public EventStore(IDatabase db, EventStoreConfig config)
        {
            _db = db;
            _config = config;
        }

        public TAggregate Load<TAggregate>(Guid id) where TAggregate : class, IAggregate, new()
        {
            var obj = GetSnapshot<TAggregate>(id) ?? new TAggregate();

            var aggregateType = typeof (TAggregate);
            var version = obj.Version;
            var streamName = String.Format("{0}-{1}", aggregateType.Name, id);
            var events = _db.Query<EventStream>("select * from event_stream where stream_name = @0 and version > @1 order by version asc", streamName, version);

            foreach (var ev in events)
            {
                var meta = Deserialize<EventMetadata>(ev.MetaData);
                var eventType = Type.GetType(meta.EventClrName);
                var @event = Deserialize(eventType, ev.Event) as IEvent;
                obj.RunEvent(@event);
                obj.Version = ev.Version;
            }

            return obj;
        }

        private TAggregate GetSnapshot<TAggregate>(Guid id) where TAggregate : class
        {
            var aggregateType = typeof (TAggregate);
            var streamName = String.Format("{0}-{1}-snapshot", aggregateType.Name, id);
            var snapshot = _db.SingleOrDefault<EventStream>("select top 1 * from event_stream where stream_name = @0 order by version desc", streamName);
            return snapshot == null ? default(TAggregate) : Deserialize<TAggregate>(snapshot.Event);
        }

        private void TakeSnapshot(IAggregate aggregate, long originalVersion)
        {
            if ((originalVersion / _config.EventsPerSnapshot) < (aggregate.Version / _config.EventsPerSnapshot))
            {
                var eventData = new EventStream
                {
                    EventId = Guid.NewGuid(),
                    Name = "Snapshot",
                    Event = Serialize(aggregate),
                    MetaData = Serialize(new {}),
                    StreamName = String.Format("{0}-{1}-snapshot", aggregate.GetType().Name, aggregate.Id),
                    Version = aggregate.Version
                };

                _db.Insert(eventData);
            }
        }

        private static IEnumerable<EventStream> EventStreamFactory(IEnumerable<IEvent> events, string streamName, long version)
        {
            return events.Select(es => new EventStream
            {
                EventId = Guid.NewGuid(),
                Name = es.GetType().Name,
                Event = Serialize(es),
                MetaData = Serialize(new EventMetadata {EventClrName = es.GetType().AssemblyQualifiedName}),
                StreamName = streamName,
                Version = ++version
            });
        }

        public void AppendToStream(IAggregate aggregate)
        {
            if (!aggregate.HasEvents)
            {
                return;
            }

            var aggregateType = aggregate.GetType().Name;
            var streamName = String.Format("{0}-{1}", aggregateType, aggregate.Id);
            var originalVersion = aggregate.Version;
            var currentVersion = aggregate.Version;
            var events = EventStreamFactory(aggregate.GetEvents(), streamName, currentVersion);

            _db.BeginTransaction();
            var error = true;
            try
            {
                foreach (var e in events)
                {
                    _db.Insert(e);
                    currentVersion++;
                }
                
                aggregate.Version = currentVersion;
                TakeSnapshot(aggregate, originalVersion);
                error = false;
            }
            finally
            {
                if (error)
                {
                    _db.AbortTransaction(); 
                }
                else
                {
                    _db.CompleteTransaction();
                }
            }

        }

        protected static JsonSerializer Serializer;

        static EventStore()
        {
            Serializer = JsonSerializer.Create(new JsonSerializerSettings()
            {
                ContractResolver = new CamelCasePropertyNamesContractResolver()
            });
        }

        private static byte[] Serialize(object data)
        {
            using (var stream = new MemoryStream())
            {
                using (var streamWriter = new StreamWriter(stream, Encoding.UTF8))
                {
                    using (var jsonWriter = new JsonTextWriter(streamWriter))
                    {
                        Serializer.Serialize(jsonWriter, data);
                    }
                }

                return stream.ToArray();
            }
        }

        private static TType Deserialize<TType>(byte[] data) where TType : class
        {
            return Deserialize(typeof (TType), data) as TType;
        }

        private static object Deserialize(Type type, byte[] data)
        {
            using (var stream = new MemoryStream(data, false))
            {
                using (var streamReader = new StreamReader(stream, Encoding.UTF8))
                {
                    using (var jsonReader = new JsonTextReader(streamReader))
                    {
                        return Serializer.Deserialize(jsonReader, type);
                    }
                }
            }
        }

    }

    public class EventMetadata
    {
        public string EventClrName { get; set; }
    }

    [PrimaryKey("StreamName,Version")]
    public class EventStream
    {
        public string StreamName { get; set; }
        public long Version { get; set; }
        public Guid EventId { get; set; }
        public string Name { get; set; }
        public byte[] MetaData { get; set; }
        public byte[] Event { get; set; }
    }

    public interface IEvent
    { 
        Guid? AggregateId { get; set; }
    }

    public interface IAggregate
    {
        Guid Id { get; }
        long Version { get; set; }
        void RunEvent(IEvent @event);
        IEnumerable<IEvent> GetEvents();
        void ClearEvents();
        bool HasEvents { get; }
    }

    public class Aggregate<TAggregate> : IAggregate
    {
        public Guid Id { get; protected set; }
        public long Version { get; protected set; }

        long IAggregate.Version { get { return Version; } set { Version = value; } }
        bool IAggregate.HasEvents { get { return _events.Any(); } }

        private static readonly Dictionary<Type, MethodInfo> EventMethods;
        private readonly IList<IEvent> _events = new List<IEvent>();
        private readonly IAggregate _typedReference;

        protected Aggregate()
        {
            _typedReference = this;
        }

        static Aggregate()
        {
            var eventType = typeof (IEvent);
            var type = typeof(TAggregate);
            EventMethods = type.GetMethods(BindingFlags.NonPublic | BindingFlags.Instance)
                    .Where(m =>
                    {
                        var parameters = m.GetParameters();
                        return m.Name == "OnHandle" && parameters.Length == 1 && eventType.IsAssignableFrom(parameters[0].ParameterType);
                    })
                    .ToDictionary(z => z.GetParameters()[0].ParameterType);
        }

        void IAggregate.RunEvent(IEvent @event)
        {
            if (@event == null) throw new ArgumentNullException("event");
            MethodInfo eventHandler;
            if (EventMethods.TryGetValue(@event.GetType(), out eventHandler))
            {
                eventHandler.Invoke(this, new object[] { @event });
            }
        }

        public IEnumerable<IEvent> GetEvents()
        {
            return _events.AsEnumerable();
        }

        public void ClearEvents()
        {
            _events.Clear();
        }

        protected void HandleEvent(IEvent @event)
        {
            if (!@event.AggregateId.HasValue)
            {
                @event.AggregateId = Id;
            }
            _typedReference.RunEvent(@event);
            _events.Add(@event);
        }
    }

    public abstract class Event : IEvent
    {
        public Guid? AggregateId { get; set; }
    }

    public class MotherBoard : Aggregate<MotherBoard>
    {
        public MotherBoard()
        {
            PciE = Enumerable.Empty<PciExpressSlot>();
            Pci = Enumerable.Empty<PciSlot>();
            SliCrossFireSupport = Enumerable.Empty<SliCrossFireSupport>();
            SataControllers = Enumerable.Empty<SataController>();
            UsbControllers = Enumerable.Empty<UsbController>();
            Nics = Enumerable.Empty<Nic>();
            GraphicsSupport = new IntegratedGraphicsSupport(Enumerable.Empty<DisplayPort>());
            SoundController = new SoundController();
        }

        protected MotherBoard(Guid id, string name, Brand brand, Socket socket, Chipset chipset, RamType ramType, MbProfile mbProfile)
            : this()
        {
            HandleEvent(new Events.Created
            {
                AggregateId = id,
                Name = name,
                Brand = brand,
                Socket = socket,
                Chipset = chipset,
                RamType = ramType,
                Profile = mbProfile
            });
        }

        public static MotherBoard Create(string name, Brand brand, Socket socket, Chipset chipset, RamType ramType, MbProfile mbProfile)
        {
            var mb = new MotherBoard(Guid.NewGuid(), name, brand, socket, chipset, ramType, mbProfile);
            return mb;
        }

        public void ChangeMaxRam(int maxRam)
        {
            HandleEvent(new Events.ChangedMaxRam
            {
                MaxRam = maxRam
            });
        }

        public void ChangeRamSlots(int ramSlots)
        {
            HandleEvent(new Events.ChangedRamSlots
            {
                RamSlots = ramSlots
            });
        }

        public void ChangeSwitchConfig(bool hasOnboardCmosSwitch, bool hasOnboardPowerSwitch, bool hasOnboardResetSwitch)
        {
            HandleEvent(new Events.ChangedSwitchConfig
            {
                HasOnboardCmosSwitch = hasOnboardCmosSwitch,
                HasOnboardPowerSwitch = hasOnboardPowerSwitch,
                HasOnboardResetSwitch = hasOnboardResetSwitch
            });
        }

        public void AddPciExpress(PciExpressSlot slot)
        {
            HandleEvent(new Events.AddedPciExpressSlot
            {
                PciExpressSlot = slot
            });
        }

        public void DeletePciExpress(Guid id)
        {
            HandleEvent(new Events.DeletedPciExpressSlot
            {
                Id = id
            });
        }

        public void AddPci(PciSlot slot)
        {
            HandleEvent(new Events.AddedPciSlot());
        }

        public void DeletePci(Guid id)
        {
            HandleEvent(new Events.DeletedPciSlot
            {
                Id = id
            });
        }

        protected void OnHandle(Events.Created @event)
        {
            Id = @event.AggregateId.Value;
            Name = @event.Name;
            BrandId = @event.Brand.Id;
            SocketId = @event.Socket.Id;
            ChipsetId = @event.Chipset.Id;
            RamType = @event.RamType;
            Profile = @event.Profile;
        }

        protected void OnHandle(Events.ChangedMaxRam @event)
        {
            MaxRam = @event.MaxRam;
        }

        protected void OnHandle(Events.ChangedRamSlots @event)
        {
            RamSlots = @event.RamSlots;
        }

        protected void OnHandle(Events.ChangedSwitchConfig @event)
        {
            OnBoardCmosSwitch = @event.HasOnboardCmosSwitch;
            OnBoardPowerSwitch = @event.HasOnboardPowerSwitch;
            OnBoardResetSwitch = @event.HasOnboardResetSwitch;
        }

        protected void OnHandle(Events.AddedPciExpressSlot @event)
        {
            PciE = PciE.Concat(new [] { @event.PciExpressSlot });
        }

        protected void OnHandle(Events.DeletedPciExpressSlot @event)
        {
            PciE = PciE.Where(x => x.Id != @event.Id);
        }

        protected void OnHandle(Events.AddedPciSlot @event)
        {
            Pci = Pci.Concat(new[] {new PciSlot()});
        }

        protected void OnHandle(Events.DeletedPciSlot @event)
        {
            Pci = Pci.Where(x => x.Id != @event.Id);
        }

        protected void OnHandle(Events.AddedSliCrossFireSupport @event)
        {
            SliCrossFireSupport = SliCrossFireSupport.Concat(new [] { @event.SliCrossFireSupport });
        }

        protected void OnHandle(Events.DeletedSliCrossFireSupport @event)
        {
            SliCrossFireSupport = SliCrossFireSupport.Where(x => x.Id != @event.Id);
        }

        protected void OnHandle(Events.AddedSataController @event)
        {
            SataControllers = SataControllers.Concat(new[] {@event.SataController});
        }

        protected void OnHandle(Events.DeletedSataController @event)
        {
            SataControllers = SataControllers.Where(x => x.Id != @event.Id);
        }

        protected void OnHandle(Events.AddedUsbController @event)
        {
            UsbControllers = UsbControllers.Concat(new[] { @event.UsbController });
        }

        protected void OnHandle(Events.DeletedUsbController @event)
        {
            UsbControllers = UsbControllers.Where(x => x.Id != @event.Id);
        }

        protected void OnHandle(Events.ChangedDisplayPorts @event)
        {
            GraphicsSupport = new IntegratedGraphicsSupport(@event.DisplayPorts);
        }

        protected void OnHandle(Events.AddedNic @event)
        {
            Nics = Nics.Concat(new[] { @event.Nic });
        }

        protected void OnHandle(Events.DeletedNic @event)
        {
            Nics = Nics.Where(x => x.Id != @event.Id);
        }

        protected void OnHandle(Events.ChangedSoundOptions @event)
        {
            SoundController.Supports51 = @event.Supports51;
            SoundController.Supports71 = @event.Supports71;
        }

        protected void OnHandle(Events.ChangedUefiSupport @event)
        {
            Uefi = @event.HasUefi;
        }

        public string Name { get; private set; }
        public Guid BrandId { get; private set; }
        public DateTime ReleaseDate { get; private set; }
        public Guid SocketId { get; private set; }
        public Guid ChipsetId { get; private set; }
        public RamType RamType { get; private set; }
        public int MaxRam { get; private set; }
        public int RamSlots { get; private set; }
        public bool OnBoardPowerSwitch { get; private set; }
        public bool OnBoardResetSwitch { get; private set; }
        public bool OnBoardCmosSwitch { get; private set; }
        public MbProfile Profile { get; private set; }
        public IEnumerable<PciExpressSlot> PciE { get; private set; }
        public IEnumerable<PciSlot> Pci { get; private set; }
        public IEnumerable<SliCrossFireSupport> SliCrossFireSupport { get; private set; }
        public IEnumerable<SataController> SataControllers { get; private set; }
        public IEnumerable<UsbController> UsbControllers { get; private set; }
        public IntegratedGraphicsSupport GraphicsSupport { get; private set; }
        public IEnumerable<Nic> Nics { get; private set; }
        public SoundController SoundController { get; private set; }
        public bool Uefi { get; set; }

        public static class Events
        {
            public class Created : Event
            {
                public string Name { get; set; }
                public Brand Brand { get; set; }
                public Socket Socket { get; set; }
                public Chipset Chipset { get; set; }
                public RamType RamType { get; set; }
                public MbProfile Profile { get; set; }
            }

            public class ChangedMaxRam : Event
            {
                public int MaxRam { get; set; }
            }

            public class ChangedRamSlots : Event
            {
                public int RamSlots { get; set; }
            }

            public class ChangedSwitchConfig : Event
            {
                public bool HasOnboardPowerSwitch { get; set; }
                public bool HasOnboardResetSwitch { get; set; }
                public bool HasOnboardCmosSwitch { get; set; }
            }

            public class AddedPciExpressSlot : Event
            {
                public PciExpressSlot PciExpressSlot { get; set; }
            }

            public class DeletedPciExpressSlot : Event
            {
                public Guid Id { get; set; }
            }

            public class AddedPciSlot : Event
            {
            }

            public class DeletedPciSlot : Event
            {
                public Guid Id { get; set; }
            }

            public class AddedSliCrossFireSupport : Event
            {
                public SliCrossFireSupport SliCrossFireSupport { get; set; }
            }

            public class DeletedSliCrossFireSupport : Event
            {
                public Guid Id { get; set; }
            }

            public class AddedSataController : Event
            {
                public SataController SataController { get; set; }
            }

            public class DeletedSataController : Event
            {
                public Guid Id { get; set; }
            }

            public class AddedUsbController : Event
            {
                public UsbController UsbController { get; set; }
            }

            public class DeletedUsbController : Event
            {
                public Guid Id { get; set; }
            }

            public class ChangedDisplayPorts : Event
            {
                public IEnumerable<DisplayPort> DisplayPorts { get; set; }
            }

            public class AddedNic : Event
            {
                public Nic Nic { get; set; }
            }

            public class DeletedNic : Event
            {
                public Guid Id { get; set; }
            }

            public class ChangedSoundOptions : Event
            {
                public bool Supports51 { get; set; }
                public bool Supports71 { get; set; }
            }

            public class ChangedUefiSupport : Event
            {
                public bool HasUefi { get; set; }
            }
        }
    }

    public class Socket : Aggregate<Socket>
    {
        public Socket(Guid id, string name, SocketSpecification specification)
        {
            Id = id;
            Name = name;
            Specification = specification;
        }

        public string Name { get; private set; }
        public SocketSpecification Specification { get; private set; }
    }

    public class Chipset : Aggregate<Chipset>
    {
        public Chipset(Guid id, string name)
        {
            Id = id;
            Name = name;
        }

        public string Name { get; private set; }
    }

    public class Brand : Aggregate<Brand>
    {
        public Brand(Guid id, string name)
        {
            Id = id;
            Name = name;
        }

        public string Name { get; private set; }
    }

    public class PciExpressSlot
    {
        public PciExpressSlot()
        {
            Id = Guid.NewGuid();
        }

        public Guid Id { get; set; }
        public PcieType Type { get; private set; }
    }

    public class PciSlot
    {
        public PciSlot()
        {
            Id = Guid.NewGuid();
        }

        public Guid Id { get; set; }
    }

    public class SliCrossFireSupport
    {
        public SliCrossFireSupport()
        {
            Id = Guid.NewGuid();
        }

        public Guid Id { get; set; }
        public IEnumerable<PcieType> SupportedConfiguration { get; private set; }
    }

    public class SataController
    {
        public SataController()
        {
            Id = Guid.NewGuid();
        }

        public Guid Id { get; set; }
        public SataType Type { get; private set; }
        public int InternalPorts { get; private set; }
        public int ExternalPorts { get; private set; }
        public Raid RaidSupport { get; private set; }
    }

    public class UsbController
    {
        public UsbController()
        {
            Id = Guid.NewGuid();
        }

        public Guid Id { get; set; }
        public UsbType Type { get; private set; }
        public int InternalPorts { get; private set; }
        public int ExternalPorts { get; private set; }
    }

    public class IntegratedGraphicsSupport
    {
        public IntegratedGraphicsSupport(IEnumerable<DisplayPort> ports)
        {
            Ports = ports;
        }

        public IEnumerable<DisplayPort> Ports { get; private set; }
    }

    public class SoundController
    {
        public bool Supports51 { get; set; }
        public bool Supports71 { get; set; }
    }

    public class Nic
    {
        public Nic()
        {
            Id = Guid.NewGuid();
        }

        public Guid Id { get; set; }
        public bool IsIntel { get; private set; }
        public bool SupportsTeaming { get; private set; }
        public bool SupportsWol { get; private set; }
        public NicType Type { get; private set; }
    }

    public enum SocketSpecification
    {
        None = 0,
        LGA2011
    }

    public enum NicType
    {
        None = 0,
        Megabit10,
        Megabit100,
        Gigabit1,
        Gigabit2
    }

    public enum MbProfile
    {
        None = 0,
        ATX,
        eATX,

    }
    
    public enum DisplayPort
    {
        None,
        MiniDisplayPort,
        VGA,
        DVI,
        HDMI,
        MiniHDMI
    }

    [Flags]
    public enum Raid
    {
        None = 0,
        Raid0 = 1 << 0,
        Raid1 = 1 << 1,
        Raid2 = 1 << 2,
        Raid3 = 1 << 3,
        Raid4 = 1 << 4,
        Raid5 = 1 << 5,
        
        Raid0_1 = Raid0 | Raid1
    }

    public enum UsbType
    {
        None = 0,
        USB2,
        USB3,
        USB3_1
    }

    public enum SataType
    {
        None = 0,
        Sata,
        SataII,
        SataIII,
        SataM2
    }

    public enum RamType
    {
        None = 0,
        DDR3,
        DDR4,
        DDR5
    }

    public enum PcieType
    {
        None = 0,
        X1,
        X2,
        X4,
        X8,
        X16
    }
}