public async Task <IEventStream> GetStream <T>(string bucket, string streamId, ISnapshot snapshot = null) where T : class, IEventSource
{
var streamName = _streamGen(typeof(T), StreamTypes.Domain, bucket, streamId);
Logger.Write(LogLevel.Debug, () => $"Retreiving stream [{streamId}] in bucket [{bucket}] for type {typeof(T).FullName}");
if (_shouldCache)
{
var cached = _cache.Retreive(streamName) as EventStream <T>;
if (cached != null)
{
HitMeter.Mark();
Logger.Write(LogLevel.Debug, () => $"Found stream [{streamName}] in cache");
return(new EventStream <T>(cached, Builder, this, snapshot));
}
MissMeter.Mark();
}
while (await CheckFrozen <T>(bucket, streamId).ConfigureAwait(false))
{
Logger.Write(LogLevel.Info, () => $"Stream [{streamName}] is frozen - waiting");
Thread.Sleep(100);
}
Logger.Write(LogLevel.Debug, () => $"Stream [{streamName}] not in cache - reading from store");
var events = await _store.GetEvents(streamName, start : snapshot?.Version + 1L).ConfigureAwait(false);
var eventstream = new EventStream <T>(Builder, this, StreamTypes.Domain, bucket, streamId, events, snapshot);
await Cache <T>(eventstream).ConfigureAwait(false);
Logger.Write(LogLevel.Debug, () => $"Stream [{streamName}] read - version is {eventstream.CommitVersion}");
return(eventstream);
}
public async Task <IEventStream> GetStream <T>(string bucket, Id streamId, IEnumerable <Id> parents = null) where T : class, IEventSource
{
parents = parents ?? new Id[] { };
var streamName = _streamGen(typeof(T), StreamTypes.Domain, bucket, streamId, parents);
Logger.Write(LogLevel.Debug, () => $"Retreiving stream [{streamId}] in bucket [{bucket}] for type {typeof(T).FullName}");
var cached = _cache.Retreive(streamName) as IImmutableEventStream;
if (cached != null)
{
HitMeter.Mark();
Logger.Write(LogLevel.Debug, () => $"Found stream [{streamName}] in cache");
return(new EventStream <T>(cached));
}
MissMeter.Mark();
while (await CheckFrozen <T>(bucket, streamId, parents).ConfigureAwait(false))
{
Logger.Write(LogLevel.Info, () => $"Stream [{streamId}] in bucket [{bucket}] is frozen - waiting");
await Task.Delay(100).ConfigureAwait(false);
}
Logger.Write(LogLevel.Debug, () => $"Stream [{streamId}] in bucket [{bucket}] not in cache - reading from store");
ISnapshot snapshot = null;
if (typeof(ISnapshotting).IsAssignableFrom(typeof(T)))
{
snapshot = await _snapstore.GetSnapshot <T>(bucket, streamId, parents).ConfigureAwait(false);
Logger.Write(LogLevel.Debug, () =>
{
if (snapshot != null)
{
return($"Retreived snapshot for entity id [{streamId}] bucket [{bucket}] version {snapshot.Version}");
}
return($"No snapshot found for entity id [{streamId}] bucket [{bucket}]");
});
}
var events = await _store.GetEvents(streamName, start : snapshot?.Version + 1).ConfigureAwait(false);
var oobMetadata = await _store.GetMetadata(streamName, OobMetadataKey).ConfigureAwait(false);
IEnumerable <OobDefinition> oobs = null;
if (!string.IsNullOrEmpty(oobMetadata))
{
oobs = JsonConvert.DeserializeObject <IEnumerable <OobDefinition> >(oobMetadata);
}
var eventstream = new EventStream <T>(bucket, streamId, parents, oobs, events, snapshot);
_cache.Cache(streamName, eventstream.Clone());
Logger.Write(LogLevel.Debug, () => $"Stream [{streamId}] in bucket [{bucket}] read - version is {eventstream.CommitVersion}");
return(eventstream);
}
public async Task <TEntity> Get <TEntity, TState>(string bucket, Id id, IEntity parent) where TEntity : IEntity <TState> where TState : class, IState, new()
{
var uow = (Configuration.Settings.LocalContainer.Value ?? Configuration.Settings.Container).Resolve <Aggregates.UnitOfWork.IDomain>();
var factory = EntityFactory.For <TEntity>();
var parents = getParents(parent);
// Todo: pass parent instead of Id[]?
var snapshot = await _snapstore.GetSnapshot <TEntity>(bucket, id, parents?.Select(x => x.StreamId).ToArray()).ConfigureAwait(false);
var events = await _eventstore.GetEvents <TEntity>(bucket, id, parents?.Select(x => x.StreamId).ToArray(), start : snapshot?.Version).ConfigureAwait(false);
var entity = factory.Create(bucket, id, parents, events.Select(x => x.Event as IEvent).ToArray(), snapshot?.Payload);
(entity as INeedDomainUow).Uow = uow;
(entity as INeedEventFactory).EventFactory = _factory;
(entity as INeedStore).Store = _eventstore;
(entity as INeedStore).OobWriter = _oobstore;
(entity as INeedVersionRegistrar).Registrar = _registrar;
(entity as INeedChildTracking).Tracker = _childTracker;
Logger.DebugEvent("Get", "[{EntityId:l}] bucket [{Bucket:l}] entity [{EntityType:l}] version {Version}", id, bucket, typeof(TEntity).FullName, entity.Version);
return(entity);
}
public async Task Resolve <TEntity, TState>(TEntity entity, IFullEvent[] uncommitted, Guid commitId, IDictionary <string, string> commitHeaders) where TEntity : IEntity <TState> where TState : IState, new()
{
var state = entity.State;
Logger.Write(LogLevel.Info, () => $"Resolving {uncommitted.Count()} uncommitted events to stream [{entity.Id}] type [{typeof(TEntity).FullName}] bucket [{entity.Bucket}]");
var latestEvents =
await _eventstore.GetEvents <TEntity>(entity.Bucket, entity.Id, entity.Parents, entity.Version).ConfigureAwait(false);
Logger.Write(LogLevel.Info, () => $"Stream is {latestEvents.Count()} events behind store");
for (var i = 0; i < latestEvents.Length; i++)
{
state.Apply(latestEvents[i].Event as IEvent);
}
Logger.Write(LogLevel.Debug, () => "Merging conflicted events");
try
{
foreach (var u in uncommitted)
{
if (u.Descriptor.StreamType == StreamTypes.Domain)
{
entity.Conflict(u.Event as IEvent);
}
else if (u.Descriptor.StreamType == StreamTypes.OOB)
{
// Todo: small hack
string id = "";
bool transient = true;
int daysToLive = -1;
id = u.Descriptor.Headers[Defaults.OobHeaderKey];
if (u.Descriptor.Headers.ContainsKey(Defaults.OobTransientKey))
{
bool.TryParse(u.Descriptor.Headers[Defaults.OobTransientKey], out transient);
}
if (u.Descriptor.Headers.ContainsKey(Defaults.OobDaysToLiveKey))
{
int.TryParse(u.Descriptor.Headers[Defaults.OobDaysToLiveKey], out daysToLive);
}
entity.Raise(u.Event as IEvent, id, transient, daysToLive);
}
}
}
catch (NoRouteException e)
{
Logger.Write(LogLevel.Info, () => $"Failed to resolve conflict: {e.Message}");
throw new ConflictResolutionFailedException("Failed to resolve conflict", e);
}
Logger.Write(LogLevel.Debug, () => "Successfully merged conflicted events");
await _eventstore.WriteEvents <TEntity>(entity.Bucket, entity.Id, entity.Parents, entity.Uncommitted, commitHeaders).ConfigureAwait(false);
}
public async Task Resolve <TEntity, TState>(TEntity entity, IFullEvent[] uncommitted, Guid commitId, IDictionary <string, string> commitHeaders) where TEntity : IEntity <TState> where TState : IState, new()
{
var state = entity.State;
Logger.DebugEvent("Resolver", "Resolving {Events} conflicting events to stream [{Stream:l}] type [{EntityType:l}] bucket [{Bucket:l}]", uncommitted.Count(), entity.Id, typeof(TEntity).FullName, entity.Bucket);
var latestEvents =
await _eventstore.GetEvents <TEntity>(entity.Bucket, entity.Id, entity.Parents, entity.Version).ConfigureAwait(false);
Logger.DebugEvent("Behind", "Stream is {Count} events behind store", latestEvents.Count());
for (var i = 0; i < latestEvents.Length; i++)
{
state.Apply(latestEvents[i].Event as IEvent);
}
try
{
foreach (var u in uncommitted)
{
if (u.Descriptor.StreamType == StreamTypes.Domain)
{
entity.Conflict(u.Event as IEvent);
}
else if (u.Descriptor.StreamType == StreamTypes.OOB)
{
// Todo: small hack
string id = "";
bool transient = true;
int daysToLive = -1;
id = u.Descriptor.Headers[Defaults.OobHeaderKey];
if (u.Descriptor.Headers.ContainsKey(Defaults.OobTransientKey))
{
bool.TryParse(u.Descriptor.Headers[Defaults.OobTransientKey], out transient);
}
if (u.Descriptor.Headers.ContainsKey(Defaults.OobDaysToLiveKey))
{
int.TryParse(u.Descriptor.Headers[Defaults.OobDaysToLiveKey], out daysToLive);
}
entity.Raise(u.Event as IEvent, id, transient, daysToLive);
}
}
}
catch (NoRouteException e)
{
Logger.WarnEvent("ResolveFailure", e, "Failed to resolve conflict: {ExceptionType} - {ExceptionMessage}", e.GetType().Name, e.Message);
throw new ConflictResolutionFailedException("Failed to resolve conflict", e);
}
await _eventstore.WriteEvents <TEntity>(entity.Bucket, entity.Id, entity.Parents, entity.Uncommitted, commitHeaders).ConfigureAwait(false);
}
public async Task Resolve <T>(T entity, IEnumerable <IFullEvent> uncommitted, Guid commitId, IDictionary <string, string> commitHeaders) where T : class, IEventSource
{
var sourced = (IEventSourced)entity;
var stream = sourced.Stream;
var streamName = _streamGen(typeof(T), StreamTypes.Domain, stream.Bucket, stream.StreamId, stream.Parents);
Logger.Write(LogLevel.Info, () => $"Resolving {uncommitted.Count()} uncommitted events to stream [{stream.StreamId}] type [{typeof(T).FullName}] bucket [{stream.Bucket}]");
try
{
await _store.Freeze <T>(stream).ConfigureAwait(false);
var latestEvents =
await _eventstore.GetEvents(streamName, stream.CommitVersion + 1).ConfigureAwait(false);
Logger.Write(LogLevel.Info, () => $"Stream is {latestEvents.Count()} events behind store");
sourced.Hydrate(latestEvents.Select(x => x.Event as IEvent));
Logger.Write(LogLevel.Debug, () => "Merging conflicted events");
try
{
foreach (var u in uncommitted)
{
sourced.Conflict(u.Event as IEvent, metadata: new Dictionary <string, string> {
{ "ConflictResolution", ConcurrencyConflict.ResolveStrongly.ToString() }
});
}
}
catch (NoRouteException e)
{
Logger.Write(LogLevel.Info, () => $"Failed to resolve conflict: {e.Message}");
throw new ConflictResolutionFailedException("Failed to resolve conflict", e);
}
Logger.Write(LogLevel.Debug, () => "Successfully merged conflicted events");
if (stream.StreamVersion != stream.CommitVersion && entity is ISnapshotting &&
((ISnapshotting)entity).ShouldTakeSnapshot())
{
Logger.Write(LogLevel.Debug,
() => $"Taking snapshot of {typeof(T).FullName} id [{entity.Id}] version {stream.StreamVersion}");
var memento = ((ISnapshotting)entity).TakeSnapshot();
stream.AddSnapshot(memento);
}
await _store.WriteStream <T>(commitId, stream, commitHeaders).ConfigureAwait(false);
}
finally
{
await _store.Unfreeze <T>(stream).ConfigureAwait(false);
}
}
public async Task migrate_from_sqlite_to_sqlserver()
{
await SetupSrc();
loop:
var i = new Random().Next(0, MaxEntities);
_src.Advanced.MigrateEventsTo(_dest, "bubu", c => c.BatchSize(50).AddConverters(new RewriteEvent()));
var evs = await _dest.GetEvents(_entities[i]);
evs.Value.Count.Should().Be(1);
var orig = _events[i].CastAs <Event1>();
if (orig == null)
{
goto loop;
}
var ev = evs.Value.First() as Event1;
ev.Nr.Should().Be(60 + orig.Nr);
}
public Task <IFullEvent[]> GetEvents <TEntity>(string bucket, Id streamId, Id[] parents, string oobId, long?start = null, int?count = null) where TEntity : IEntity
{
var stream = _generator(typeof(TEntity), StreamTypes.OOB, $"{oobId}.{bucket}", streamId, parents);
return(_store.GetEvents(stream, start, count));
}
public Task <IEnumerable <IWritableEvent> > Retrieve <T>(string bucket, string streamId, int?skip = null, int?take = null, bool ascending = true) where T : class, IEventSource
{
var streamName = _streamGen(typeof(T), bucket + ".OOB", streamId);
return(!ascending?_store.GetEventsBackwards(streamName) : _store.GetEvents(streamName));
}
public async Task Resolve <T>(T entity, IEnumerable <IFullEvent> uncommitted, Guid commitId, IDictionary <string, string> commitHeaders) where T : class, IEventSource
{
var sourced = (IEventSourced)entity;
// Store conflicting events in memory
// After 100 or so pile up pull the latest stream and attempt to write them again
var streamName = _streamGen(typeof(T), StreamTypes.Domain, sourced.Stream.Bucket, sourced.Stream.StreamId, sourced.Stream.Parents);
var message = new ConflictingEvents
{
Bucket = sourced.Stream.Bucket,
StreamId = sourced.Stream.StreamId,
EntityType = typeof(T).AssemblyQualifiedName,
Parents = BuildParentList(entity),
Events = uncommitted
};
var package = new DelayedMessage
{
MessageId = Guid.NewGuid().ToString(),
Headers = new Dictionary <string, string>(),
Message = message,
Received = DateTime.UtcNow,
ChannelKey = streamName
};
foreach (var header in commitHeaders)
{
package.Headers[$"Conflict.{header.Key}"] = header.Value;
}
await _delay.AddToQueue(ConcurrencyConflict.ResolveWeakly.ToString(), package, streamName)
.ConfigureAwait(false);
// Todo: make 30 seconds configurable
var age = await _delay.Age(ConcurrencyConflict.ResolveWeakly.ToString(), streamName).ConfigureAwait(false);
if (!age.HasValue || age < TimeSpan.FromSeconds(30))
{
return;
}
var stream = sourced.Stream;
Logger.Write(LogLevel.Info,
() => $"Starting weak conflict resolve for stream [{stream.StreamId}] type [{typeof(T).FullName}] bucket [{stream.Bucket}]");
try
{
await _store.Freeze <T>(stream).ConfigureAwait(false);
var delayed = await _delay.Pull(streamName, max : 200).ConfigureAwait(false);
// If someone else pulled while we were waiting
if (!delayed.Any())
{
return;
}
Logger.Write(LogLevel.Info,
() => $"Resolving {delayed.Count()} uncommitted events to stream [{stream.StreamId}] type [{typeof(T).FullName}] bucket [{stream.Bucket}]");
var latestEvents =
await _eventstore.GetEvents(streamName, stream.CommitVersion + 1L)
.ConfigureAwait(false);
Logger.Write(LogLevel.Info,
() => $"Stream [{stream.StreamId}] bucket [{stream.Bucket}] is {latestEvents.Count()} events behind store");
sourced.Hydrate(latestEvents.Select(x => x.Event as IEvent));
Logger.Write(LogLevel.Debug, () => $"Merging {delayed.Count()} conflicted events");
try
{
foreach (var u in delayed.Select(x => x.Message as ConflictingEvents).SelectMany(x => x.Events))
{
sourced.Conflict(u.Event as IEvent,
metadata:
new Dictionary <string, string>
{
{ "ConflictResolution", ConcurrencyConflict.ResolveWeakly.ToString() }
});
}
}
catch (NoRouteException e)
{
Logger.Write(LogLevel.Info, () => $"Failed to resolve conflict: {e.Message}");
throw new ConflictResolutionFailedException("Failed to resolve conflict", e);
}
Logger.Write(LogLevel.Info, () => "Successfully merged conflicted events");
if (stream.StreamVersion != stream.CommitVersion && entity is ISnapshotting &&
((ISnapshotting)entity).ShouldTakeSnapshot())
{
Logger.Write(LogLevel.Debug,
() =>
$"Taking snapshot of [{typeof(T).FullName}] id [{entity.Id}] version {stream.StreamVersion}");
var memento = ((ISnapshotting)entity).TakeSnapshot();
stream.AddSnapshot(memento);
}
await _store.WriteStream <T>(commitId, stream, commitHeaders).ConfigureAwait(false);
}
finally
{
await _store.Unfreeze <T>(stream).ConfigureAwait(false);
}
}
