Line data    Source code

       1             : #region Copyright
       2             : // // -----------------------------------------------------------------------
       3             : // // <copyright company="cdmdotnet Limited">
       4             : // //   Copyright cdmdotnet Limited. All rights reserved.
       5             : // // </copyright>
       6             : // // -----------------------------------------------------------------------
       7             : #endregion
       8             : 
       9             : using System;
      10             : using System.Collections.Generic;
      11             : using System.Linq;
      12             : using cdmdotnet.Logging;
      13             : using Cqrs.Domain.Exceptions;
      14             : using Cqrs.Domain.Factories;
      15             : using Cqrs.Events;
      16             : 
      17             : namespace Cqrs.Domain
      18             : {
      19             :         public class SagaRepository<TAuthenticationToken> : ISagaRepository<TAuthenticationToken>
      20           0 :         {
      21             :                 protected IEventStore<TAuthenticationToken> EventStore { get; private set; }
      22             : 
      23             :                 protected IEventPublisher<TAuthenticationToken> Publisher { get; private set; }
      24             : 
      25             :                 protected IAggregateFactory SagaFactory { get; private set; }
      26             : 
      27             :                 protected ICorrelationIdHelper CorrelationIdHelper { get; private set; }
      28             : 
      29           0 :                 public SagaRepository(IAggregateFactory sagaFactory, IEventStore<TAuthenticationToken> eventStore, IEventPublisher<TAuthenticationToken> publisher, ICorrelationIdHelper correlationIdHelper)
      30             :                 {
      31             :                         EventStore = eventStore;
      32             :                         Publisher = publisher;
      33             :                         CorrelationIdHelper = correlationIdHelper;
      34             :                         SagaFactory = sagaFactory;
      35             :                 }
      36             : 
      37           0 :                 public virtual void Save<TSaga>(TSaga saga, int? expectedVersion = null)
      38             :                         where TSaga : ISaga<TAuthenticationToken>
      39             :                 {
      40             :                         IList<ISagaEvent<TAuthenticationToken>> uncommittedChanges = saga.GetUncommittedChanges().ToList();
      41             :                         if (!uncommittedChanges.Any())
      42             :                                 return;
      43             : 
      44             :                         if (expectedVersion != null)
      45             :                         {
      46             :                                 IEnumerable<IEvent<TAuthenticationToken>> eventStoreResults = EventStore.Get(saga.GetType(), saga.Id, false, expectedVersion.Value);
      47             :                                 if (eventStoreResults.Any())
      48             :                                         throw new ConcurrencyException(saga.Id);
      49             :                         }
      50             : 
      51             :                         var eventsToPublish = new List<ISagaEvent<TAuthenticationToken>>();
      52             : 
      53             :                         int i = 0;
      54             :                         foreach (ISagaEvent<TAuthenticationToken> @event in uncommittedChanges)
      55             :                         {
      56             :                                 if (@event.Id == Guid.Empty)
      57             :                                         @event.Id = saga.Id;
      58             :                                 if (@event.Id == Guid.Empty)
      59             :                                         throw new AggregateOrEventMissingIdException(saga.GetType(), @event.GetType());
      60             : 
      61             :                                 i++;
      62             : 
      63             :                                 @event.Version = saga.Version + i;
      64             :                                 @event.TimeStamp = DateTimeOffset.UtcNow;
      65             :                                 @event.CorrelationId = CorrelationIdHelper.GetCorrelationId();
      66             :                                 EventStore.Save(saga.GetType(), @event);
      67             :                                 eventsToPublish.Add(@event);
      68             :                         }
      69             : 
      70             :                         saga.MarkChangesAsCommitted();
      71             :                         foreach (ISagaEvent<TAuthenticationToken> @event in eventsToPublish)
      72             :                                 PublishEvent(@event);
      73             :                 }
      74             : 
      75           0 :                 protected virtual void PublishEvent(ISagaEvent<TAuthenticationToken> @event)
      76             :                 {
      77             :                         Publisher.Publish(@event);
      78             :                 }
      79             : 
      80           0 :                 public virtual TSaga Get<TSaga>(Guid sagaId, IList<ISagaEvent<TAuthenticationToken>> events = null)
      81             :                         where TSaga : ISaga<TAuthenticationToken>
      82             :                 {
      83             :                         return LoadSaga<TSaga>(sagaId, events);
      84             :                 }
      85             : 
      86           0 :                 protected virtual TSaga CreateSaga<TSaga>(Guid id)
      87             :                         where TSaga : ISaga<TAuthenticationToken>
      88             :                 {
      89             :                         var saga = SagaFactory.Create<TSaga>(id);
      90             : 
      91             :                         return saga;
      92             :                 }
      93             : 
      94           0 :                 protected virtual TSaga LoadSaga<TSaga>(Guid id, IList<ISagaEvent<TAuthenticationToken>> events = null)
      95             :                         where TSaga : ISaga<TAuthenticationToken>
      96             :                 {
      97             :                         var saga = SagaFactory.Create<TSaga>(id);
      98             : 
      99             :                         LoadSagaHistory(saga, events);
     100             :                         return saga;
     101             :                 }
     102             : 
     103           0 :                 public virtual void LoadSagaHistory<TSaga>(TSaga saga, IList<ISagaEvent<TAuthenticationToken>> events = null, bool throwExceptionOnNoEvents = true)
     104             :                         where TSaga : ISaga<TAuthenticationToken>
     105             :                 {
     106             :                         IList<ISagaEvent<TAuthenticationToken>> theseEvents = events ?? EventStore.Get<TSaga>(saga.Id).Cast<ISagaEvent<TAuthenticationToken>>().ToList();
     107             :                         if (!theseEvents.Any())
     108             :                         {
     109             :                                 if (throwExceptionOnNoEvents)
     110             :                                         throw new SagaNotFoundException<TSaga, TAuthenticationToken>(saga.Id);
     111             :                                 return;
     112             :                         }
     113             : 
     114             :                         var duplicatedEvents =
     115             :                                 theseEvents.GroupBy(x => x.Version)
     116             :                                         .Select(x => new { Version = x.Key, Total = x.Count() })
     117             :                                         .FirstOrDefault(x => x.Total > 1);
     118             :                         if (duplicatedEvents != null)
     119             :                                 throw new DuplicateSagaEventException<TSaga, TAuthenticationToken>(saga.Id, duplicatedEvents.Version);
     120             : 
     121             :                         saga.LoadFromHistory(theseEvents);
     122             :                 }
     123             :         }
     124             : }