ProjectionStream LoadProjectionStream(Type projectionType, IBlobId projectionId)
{
string projectionName = projectionType.GetContractId();
ReadResult <ProjectionVersions> result = GetProjectionVersions(projectionName);
if (result.IsSuccess)
{
ProjectionVersion liveVersion = result.Data.GetLive();
if (liveVersion is null)
{
log.Warn(() => $"Unable to find projection `live` version. ProjectionId:{projectionId} ProjectionName:{projectionName} ProjectionType:{projectionType.Name}{Environment.NewLine}AvailableVersions:{Environment.NewLine}{result.Data.ToString()}");
return(ProjectionStream.Empty());
}
ISnapshot snapshot = null;
if (projectionType.IsSnapshotable())
{
snapshot = snapshotStore.Load(projectionName, projectionId, liveVersion);
}
else
{
snapshot = new NoSnapshot(projectionId, projectionName);
}
return(LoadProjectionStream(projectionType, liveVersion, projectionId, snapshot));
}
return(ProjectionStream.Empty());
}
public IProjectionGetResult <T> Get <T>(IBlobId projectionId) where T : IProjectionDefinition
{
if (ReferenceEquals(null, projectionId))
{
throw new ArgumentNullException(nameof(projectionId));
}
Type projectionType = typeof(T);
string contractId = projectionType.GetContractId();
try
{
ProjectionVersion liveVersion = GetProjectionVersions(contractId).GetLive();
if (ReferenceEquals(null, liveVersion))
{
log.Warn(() => $"Unable to find `live` version for projection with contract id {contractId} and name {projectionType.Name}");
return(new ProjectionGetResult <T>(default(T)));
}
ISnapshot snapshot = snapshotStore.Load(contractId, projectionId, liveVersion);
ProjectionStream stream = LoadProjectionStream(projectionType, liveVersion, projectionId, snapshot);
IProjectionGetResult <T> queryResult = stream.RestoreFromHistory <T>();
return(queryResult);
}
catch (Exception ex)
{
log.ErrorException($"Unable to load projection. ProjectionId:{projectionId} ProjectionContractId:{contractId} ProjectionName:{projectionType.Name}", ex);
return(new ProjectionGetResult <T>(default(T)));
}
}
async Task <ProjectionStream> LoadProjectionStreamAsync(Type projectionType, IBlobId projectionId)
{
string projectionName = projectionType.GetContractId();
ReadResult <ProjectionVersions> result = GetProjectionVersions(projectionName);
if (result.IsSuccess)
{
ProjectionVersion liveVersion = result.Data.GetLive();
if (liveVersion is null)
{
log.Warn(() => $"Unable to find projection `live` version. ProjectionId:{projectionId} ProjectionName:{projectionName} ProjectionType:{projectionType.Name}");
return(ProjectionStream.Empty());
}
ISnapshot snapshot = null;
if (projectionType.IsSnapshotable())
{
snapshot = snapshotStore.Load(projectionName, projectionId, liveVersion);
}
else
{
snapshot = new NoSnapshot(projectionId, projectionName);
}
ProjectionStream stream = await LoadProjectionStreamAsync(projectionType, liveVersion, projectionId, snapshot);
return(stream);
}
return(ProjectionStream.Empty());
}
private async Task <ProjectionStream> LoadProjectionStreamAsync(ProjectionVersion version, IBlobId projectionId, ISnapshot snapshot)
{
bool shouldLoadMore = true;
Func <ISnapshot> loadSnapshot = () => snapshot;
List <ProjectionCommit> projectionCommits = new List <ProjectionCommit>();
int snapshotMarker = snapshot.Revision;
while (shouldLoadMore)
{
snapshotMarker++;
var loadProjectionCommits = projectionStore.LoadAsync(version, projectionId, snapshotMarker).ConfigureAwait(false);
bool checkNextSnapshotMarker = await projectionStore.HasSnapshotMarkerAsync(version, projectionId, snapshotMarker + 1).ConfigureAwait(false);
shouldLoadMore = checkNextSnapshotMarker;
await foreach (var commit in loadProjectionCommits)
{
projectionCommits.Add(commit);
}
}
ProjectionStream stream = new ProjectionStream(projectionId, projectionCommits, loadSnapshot);
return(stream);
}
public async Task <ReadResult <IProjectionDefinition> > GetAsync(IBlobId projectionId, Type projectionType)
{
using (log.BeginScope(s => s
.AddScope(Log.ProjectionName, projectionType.GetContractId())
.AddScope(Log.ProjectionType, projectionType.Name)
.AddScope(Log.ProjectionInstanceId, projectionId.RawId)))
{
if (ReferenceEquals(null, projectionId))
{
throw new ArgumentNullException(nameof(projectionId));
}
try
{
ProjectionStream stream = await LoadProjectionStreamAsync(projectionType, projectionId);
var readResult = new ReadResult <IProjectionDefinition>(await stream.RestoreFromHistoryAsync(projectionType).ConfigureAwait(false));
if (readResult.NotFound && log.IsDebugEnabled())
{
log.Debug(() => "Projection instance not found.");
}
return(readResult);
}
catch (Exception ex)
{
log.ErrorException(ex, () => "Unable to load projection.");
return(ReadResult <IProjectionDefinition> .WithError(ex));
}
}
}
public IProjectionGetResult <IProjectionDefinition> Get(IBlobId projectionId, Type projectionType)
{
if (ReferenceEquals(null, projectionId))
{
throw new ArgumentNullException(nameof(projectionId));
}
ProjectionStream stream = LoadProjectionStream(projectionType, projectionId);
return(stream.RestoreFromHistory(projectionType));
}
IProjectionGetResult <PersistentProjectionVersionHandler> GetProjectionVersionsFromStore(string contractId)
{
var versionId = new ProjectionVersionManagerId(contractId);
var persistentVersionType = typeof(PersistentProjectionVersionHandler);
var persistentVersionContractId = persistentVersionType.GetContractId();
var persistentVersion = new ProjectionVersion(persistentVersionContractId, ProjectionStatus.Live, 1, persistentVersionType.GetProjectionHash());
ProjectionStream stream = LoadProjectionStream(persistentVersionType, persistentVersion, versionId, new NoSnapshot(versionId, contractId));
var queryResult = stream.RestoreFromHistory <PersistentProjectionVersionHandler>();
return(queryResult);
}
ProjectionStream LoadProjectionStream(Type projectionType, ProjectionVersion projectionVersion, IBlobId projectionId, ISnapshot snapshot)
{
if (ReferenceEquals(null, projectionVersion))
{
throw new ArgumentNullException(nameof(projectionVersion));
}
if (ReferenceEquals(null, projectionId))
{
throw new ArgumentNullException(nameof(projectionId));
}
if (ReferenceEquals(null, snapshot))
{
throw new ArgumentNullException(nameof(snapshot));
}
ISnapshot currentSnapshot = snapshot;
string contractId = projectionVersion.ProjectionName;
List <ProjectionCommit> projectionCommits = new List <ProjectionCommit>();
int snapshotMarker = snapshot.Revision;
while (true)
{
snapshotMarker++;
var loadedCommits = projectionStore.Load(projectionVersion, projectionId, snapshotMarker).ToList();
projectionCommits.AddRange(loadedCommits);
bool isSnapshotable = typeof(IAmNotSnapshotable).IsAssignableFrom(projectionType) == false;
if (isSnapshotable && snapshotStrategy.ShouldCreateSnapshot(projectionCommits, snapshot.Revision))
{
ProjectionStream checkpointStream = new ProjectionStream(projectionId, projectionCommits, currentSnapshot);
var projectionState = checkpointStream.RestoreFromHistory(projectionType).Projection.State;
ISnapshot newSnapshot = new Snapshot(projectionId, contractId, projectionState, snapshot.Revision + 1);
snapshotStore.Save(newSnapshot, projectionVersion);
currentSnapshot = newSnapshot;
projectionCommits.Clear();
log.Debug(() => $"Snapshot created for projection `{contractId}` with id={projectionId} where ({loadedCommits.Count}) were zipped. Snapshot: `{snapshot.GetType().Name}`");
}
else if (loadedCommits.Count() < snapshotStrategy.EventsInSnapshot)
{
break;
}
else
{
log.Warn($"Potential memory leak. The system will be down fairly soon. The projection `{contractId}` with id={projectionId} loads a lot of projection commits ({loadedCommits.Count}) and snapshot `{snapshot.GetType().Name}` which puts a lot of CPU and RAM pressure. You can resolve this by configuring the snapshot settings`.");
}
}
ProjectionStream stream = new ProjectionStream(projectionId, projectionCommits, currentSnapshot);
return(stream);
}
public IProjectionGetResult <T> Get <T>(IBlobId projectionId) where T : IProjectionDefinition
{
if (ReferenceEquals(null, projectionId))
{
throw new ArgumentNullException(nameof(projectionId));
}
Type projectionType = typeof(T);
ProjectionStream stream = LoadProjectionStream(projectionType, projectionId);
return(stream.RestoreFromHistory <T>());
}
ProjectionStream LoadProjectionStream(Type projectionType, ProjectionVersion version, IBlobId projectionId, SnapshotMeta snapshotMeta)
{
Func <ISnapshot> loadSnapshot = () => snapshotStore.Load(version.ProjectionName, projectionId, version);
List <ProjectionCommit> projectionCommits = new List <ProjectionCommit>();
int snapshotMarker = snapshotMeta.Revision;
while (true)
{
snapshotMarker++;
var loadedCommits = projectionStore.Load(version, projectionId, snapshotMarker).ToList();
projectionCommits.AddRange(loadedCommits);
if (projectionType.IsSnapshotable())
{
if (snapshotStrategy.ShouldCreateSnapshot(projectionCommits, snapshotMeta.Revision))
{
ProjectionStream checkpointStream = new ProjectionStream(projectionId, projectionCommits, loadSnapshot);
var projectionState = checkpointStream.RestoreFromHistory(projectionType).State;
ISnapshot newSnapshot = new Snapshot(projectionId, version.ProjectionName, projectionState, snapshotMeta.Revision + 1);
snapshotStore.Save(newSnapshot, version);
loadSnapshot = () => newSnapshot;
projectionCommits.Clear();
log.Debug(() => $"Snapshot created for projection `{version.ProjectionName}` with id={projectionId} where ({loadedCommits.Count}) were zipped. Snapshot: `{newSnapshot.GetType().Name}`");
}
}
else
{
loadSnapshot = () => new NoSnapshot(projectionId, version.ProjectionName);
}
if (loadedCommits.Count < snapshotStrategy.EventsInSnapshot)
{
break;
}
if (loadedCommits.Count > snapshotStrategy.EventsInSnapshot * 1.5)
{
log.Warn(() => $"Potential memory leak. The system will be down fairly soon. The projection `{version.ProjectionName}` with id={projectionId} loads a lot of projection commits ({loadedCommits.Count}) which puts a lot of CPU and RAM pressure. You can resolve this by configuring the snapshot settings`.");
}
}
ProjectionStream stream = new ProjectionStream(projectionId, projectionCommits, loadSnapshot);
return(stream);
}
public ReadResult <IProjectionDefinition> Get(IBlobId projectionId, Type projectionType)
{
if (ReferenceEquals(null, projectionId))
{
throw new ArgumentNullException(nameof(projectionId));
}
try
{
ProjectionStream stream = LoadProjectionStream(projectionType, projectionId);
return(new ReadResult <IProjectionDefinition>(stream.RestoreFromHistory(projectionType)));
}
catch (Exception ex)
{
log.ErrorException($"Unable to load projection. {projectionType.Name}({projectionId})", ex);
return(ReadResult <IProjectionDefinition> .WithError(ex));
}
}
ReadResult <ProjectionVersionsHandler> GetProjectionVersionsFromStore(string projectionName)
{
try
{
var persistentVersionType = typeof(ProjectionVersionsHandler);
var projectionVersions_ProjectionName = persistentVersionType.GetContractId();
var versionId = new ProjectionVersionManagerId(projectionName, context.Tenant);
var persistentVersion = new ProjectionVersion(projectionVersions_ProjectionName, ProjectionStatus.Live, 1, projectionHasher.CalculateHash(persistentVersionType));
ProjectionStream stream = LoadProjectionStream(persistentVersionType, persistentVersion, versionId, new NoSnapshot(versionId, projectionVersions_ProjectionName).GetMeta());
var queryResult = stream.RestoreFromHistory <ProjectionVersionsHandler>();
return(new ReadResult <ProjectionVersionsHandler>(queryResult));
}
catch (Exception ex)
{
return(ReadResult <ProjectionVersionsHandler> .WithNotFoundHint(ex.Message));
}
}
public ReadResult <T> Get <T>(IBlobId projectionId) where T : IProjectionDefinition
{
try
{
if (ReferenceEquals(null, projectionId))
{
throw new ArgumentNullException(nameof(projectionId));
}
Type projectionType = typeof(T);
ProjectionStream stream = LoadProjectionStream(projectionType, projectionId);
return(new ReadResult <T>(stream.RestoreFromHistory <T>()));
}
catch (Exception ex)
{
log.ErrorException($"Unable to load projection. {typeof(T).Name}({projectionId})", ex);
return(ReadResult <T> .WithError(ex));
}
}
public async Task <ReadResult <T> > GetAsync <T>(IBlobId projectionId) where T : IProjectionDefinition
{
if (ReferenceEquals(null, projectionId))
{
throw new ArgumentNullException(nameof(projectionId));
}
try
{
Type projectionType = typeof(T);
ProjectionStream stream = await LoadProjectionStreamAsync(projectionType, projectionId);
return(new ReadResult <T>(stream.RestoreFromHistory <T>()));
}
catch (Exception ex)
{
log.ErrorException(ex, () => $"Unable to load projection. {typeof(T).Name}({projectionId})");
return(ReadResult <T> .WithError(ex));
}
}
private async Task <ReadResult <ProjectionVersionsHandler> > GetProjectionVersionsFromStoreAsync(string projectionName)
{
try
{
var persistentVersionType = typeof(ProjectionVersionsHandler);
var projectionVersions_ProjectionName = persistentVersionType.GetContractId();
var versionId = new ProjectionVersionManagerId(projectionName, context.Tenant);
var persistentVersion = new ProjectionVersion(projectionVersions_ProjectionName, ProjectionStatus.Live, 1, projectionHasher.CalculateHash(persistentVersionType));
ProjectionStream stream = await LoadProjectionStreamAsync(persistentVersionType, persistentVersion, versionId, new NoSnapshot(versionId, projectionVersions_ProjectionName).GetMeta()).ConfigureAwait(false);
var queryResult = await stream.RestoreFromHistoryAsync <ProjectionVersionsHandler>().ConfigureAwait(false);
return(new ReadResult <ProjectionVersionsHandler>(queryResult));
}
catch (Exception ex)
{
log.WarnException(ex, () => $"Failed to load projection versions. ProjectionName: {projectionName}");
return(ReadResult <ProjectionVersionsHandler> .WithError(ex.Message));
}
}
public void Save(Type projectionType, IEvent @event, EventOrigin eventOrigin)
{
if (ReferenceEquals(null, projectionType))
{
throw new ArgumentNullException(nameof(projectionType));
}
if (ReferenceEquals(null, @event))
{
throw new ArgumentNullException(nameof(@event));
}
if (ReferenceEquals(null, eventOrigin))
{
throw new ArgumentNullException(nameof(eventOrigin));
}
string contractId = projectionType.GetContractId();
var instance = FastActivator.CreateInstance(projectionType);
var statefullProjection = instance as IProjectionDefinition;
if (statefullProjection != null)
{
var projectionIds = statefullProjection.GetProjectionIds(@event);
foreach (var version in GetProjectionVersions(contractId))
{
foreach (var projectionId in projectionIds)
{
ISnapshot snapshot = snapshotStore.Load(contractId, projectionId, version);
ProjectionStream projectionStream = LoadProjectionStream(projectionType, version, projectionId, snapshot);
int snapshotMarker = snapshotStrategy.GetSnapshotMarker(projectionStream.Commits, snapshot.Revision);
var commit = new ProjectionCommit(projectionId, version, @event, snapshotMarker, eventOrigin, DateTime.UtcNow);
projectionStore.Save(commit);
}
}
}
}
private async Task <ProjectionStream> LoadProjectionStreamAsync(Type projectionType, IBlobId projectionId)
{
string projectionName = projectionType.GetContractId();
ReadResult <ProjectionVersions> result = await GetProjectionVersionsAsync(projectionName).ConfigureAwait(false);
if (result.IsSuccess)
{
ProjectionVersion liveVersion = result.Data.GetLive();
if (liveVersion is null)
{
log.Warn(() => $"Unable to find projection `live` version. {Environment.NewLine}AvailableVersions:{Environment.NewLine}{result.Data.ToString()}");
return(ProjectionStream.Empty());
}
ISnapshot snapshot = projectionType.IsSnapshotable()
? await snapshotStore.LoadAsync(projectionName, projectionId, liveVersion).ConfigureAwait(false)
: new NoSnapshot(projectionId, projectionName);
return(await LoadProjectionStreamAsync(liveVersion, projectionId, snapshot));
}
return(ProjectionStream.Empty());
}
ProjectionStream LoadProjectionStream(Type projectionType, IBlobId projectionId)
{
string projectionName = projectionType.GetContractId();
try
{
ProjectionVersion liveVersion = GetProjectionVersions(projectionName).GetLive();
if (ReferenceEquals(null, liveVersion))
{
log.Warn(() => $"Unable to find `live` version for projection with contract id {projectionName} and name {projectionType.Name}");
return(ProjectionStream.Empty());
}
ISnapshot snapshot = snapshotStore.Load(projectionName, projectionId, liveVersion);
ProjectionStream stream = LoadProjectionStream(projectionType, liveVersion, projectionId, snapshot);
return(stream);
}
catch (Exception ex)
{
log.ErrorException($"Unable to load projection stream. ProjectionId:{projectionId} ProjectionContractId:{projectionName} ProjectionName:{projectionType.Name}", ex);
return(ProjectionStream.Empty());
}
}
public void Save(Type projectionType, CronusMessage cronusMessage)
{
if (ReferenceEquals(null, projectionType))
{
throw new ArgumentNullException(nameof(projectionType));
}
if (ReferenceEquals(null, cronusMessage))
{
throw new ArgumentNullException(nameof(cronusMessage));
}
var projection = FastActivator.CreateInstance(projectionType) as IProjectionDefinition;
if (projection != null)
{
var projectionIds = projection.GetProjectionIds(cronusMessage.Payload as IEvent);
string contractId = projectionType.GetContractId();
foreach (var projectionId in projectionIds)
{
foreach (var version in GetProjectionVersions(contractId))
{
ISnapshot snapshot = snapshotStore.Load(contractId, projectionId, version);
ProjectionStream projectionStream = LoadProjectionStream(projectionType, version, projectionId, snapshot);
int snapshotMarker = snapshotStrategy.GetSnapshotMarker(projectionStream.Commits, snapshot.Revision);
EventOrigin eventOrigin = cronusMessage.GetEventOrigin();
DateTime timestamp = DateTime.UtcNow;
IEvent @event = cronusMessage.Payload as IEvent;
var commit = new ProjectionCommit(projectionId, version, @event, snapshotMarker, eventOrigin, timestamp);
projectionStore.Save(commit);
}
}
}
}
public void Save(Type projectionType, IEvent @event, EventOrigin eventOrigin)
{
if (ReferenceEquals(null, projectionType))
{
throw new ArgumentNullException(nameof(projectionType));
}
if (ReferenceEquals(null, @event))
{
throw new ArgumentNullException(nameof(@event));
}
if (ReferenceEquals(null, eventOrigin))
{
throw new ArgumentNullException(nameof(eventOrigin));
}
string projectionName = projectionType.GetContractId();
var handlerInstance = handlerFactory.Create(projectionType);
var projection = handlerInstance.Current as IProjectionDefinition;
if (projection != null)
{
var projectionIds = projection.GetProjectionIds(@event);
foreach (var projectionId in projectionIds)
{
ReadResult <ProjectionVersions> result = GetProjectionVersions(projectionName);
if (result.IsSuccess)
{
foreach (ProjectionVersion version in result.Data)
{
if (version.Status == ProjectionStatus.Building || version.Status == ProjectionStatus.Live)
{
try
{
SnapshotMeta snapshotMeta = null;
if (projectionType.IsSnapshotable())
{
snapshotMeta = snapshotStore.LoadMeta(projectionName, projectionId, version);
}
else
{
snapshotMeta = new NoSnapshot(projectionId, projectionName).GetMeta();
}
ProjectionStream projectionStream = LoadProjectionStream(projectionType, version, projectionId, snapshotMeta);
int snapshotMarker = snapshotStrategy.GetSnapshotMarker(projectionStream.Commits, snapshotMeta.Revision);
var commit = new ProjectionCommit(projectionId, version, @event, snapshotMarker, eventOrigin, DateTime.UtcNow);
projectionStore.Save(commit);
}
catch (Exception ex)
{
log.ErrorException("Failed to persist event." + Environment.NewLine + $"\tProjectionVersion:{version}" + Environment.NewLine + $"\tEvent:{@event}", ex);
}
}
else if (version.Status == ProjectionStatus.NotPresent)
{
var commit = new ProjectionCommit(projectionId, version, @event, 1, eventOrigin, DateTime.UtcNow);
projectionStore.Save(commit);
}
}
}
}
}
}
public void Save(Type projectionType, IEvent @event, EventOrigin eventOrigin, ProjectionVersion version)
{
if (ReferenceEquals(null, projectionType))
{
throw new ArgumentNullException(nameof(projectionType));
}
if (ReferenceEquals(null, @event))
{
throw new ArgumentNullException(nameof(@event));
}
if (ReferenceEquals(null, eventOrigin))
{
throw new ArgumentNullException(nameof(eventOrigin));
}
if (ReferenceEquals(null, version))
{
throw new ArgumentNullException(nameof(version));
}
if ((version.Status == ProjectionStatus.Building || version.Status == ProjectionStatus.Live) == false)
{
throw new ArgumentException("Invalid version. Only versions in `Building` and `Live` status are eligable for persistence.", nameof(version));
}
string projectionName = projectionType.GetContractId();
if (projectionName.Equals(version.ProjectionName, StringComparison.OrdinalIgnoreCase) == false)
{
throw new ArgumentException($"Invalid version. The version `{version}` does not match projection `{projectionName}`", nameof(version));
}
var handlerInstance = handlerFactory.Create(projectionType);
var projection = handlerInstance.Current as IProjectionDefinition;
if (projection != null)
{
var projectionIds = projection.GetProjectionIds(@event);
foreach (var projectionId in projectionIds)
{
try
{
SnapshotMeta snapshotMeta = null;
if (projectionType.IsSnapshotable())
{
snapshotMeta = snapshotStore.LoadMeta(projectionName, projectionId, version);
}
else
{
snapshotMeta = new NoSnapshot(projectionId, projectionName).GetMeta();
}
ProjectionStream projectionStream = LoadProjectionStream(projectionType, version, projectionId, snapshotMeta);
int snapshotMarker = snapshotStrategy.GetSnapshotMarker(projectionStream.Commits, snapshotMeta.Revision);
var commit = new ProjectionCommit(projectionId, version, @event, snapshotMarker, eventOrigin, DateTime.UtcNow);
projectionStore.Save(commit);
}
catch (Exception ex)
{
log.ErrorException("Failed to persist event." + Environment.NewLine + $"\tProjectionVersion:{version}" + Environment.NewLine + $"\tEvent:{@event}", ex);
}
}
}
}
