public async Task UpdateEntityToProjectionAsync(ProjectionSourceDescriptor projectionSource,
IProjectionResult projectionResult,
bool addEntityToProjections,
CancellationToken cancellation)
{
if (addEntityToProjections)
{
var projectionId = GetProjectionId(projectionResult);
var addedProjection = new ProjectionTargetDescriptor <TProjectionId>(typeof(TProjection), projectionId);
var(originalMetadata, metadata) = await GetMetadataAsync(addedProjection, cancellation);
Assert(!metadata.ProjectionSources.Any(p => p.Id == projectionSource.SourceId &&
p.Type == projectionSource.SourceType.GetUnqualifiedTypeName()));
var storedProjectionSource = new ProjectionSource
{
Id = projectionSource.SourceId,
Type = projectionSource.SourceType.GetUnqualifiedTypeName()
};
metadata.ProjectionSources.Add(storedProjectionSource);
_targetMetadataCache[addedProjection] = new ProjectionTargetMetadataCacheEntry(originalMetadata,
metadata,
touched: true);
}
_targetsToUpdate.Add((TProjection)projectionResult.Result);
}
private async Task ProjectAsync(ProjectionSourceDescriptor entityDescriptor,
ISet <ProjectionSourceDescriptor> processedEntities,
CancellationToken cancellation)
{
if (processedEntities.Contains(entityDescriptor))
{
return;
}
var scopedEngine = new SourceScopedProjectionEngine(entityDescriptor, _projector, _transactionalDatabase, _database, _serviceProvider);
var dependents = await scopedEngine.ProjectAsync(cancellation);
processedEntities.Add(entityDescriptor);
foreach (var dependent in dependents)
{
await ProjectAsync(dependent, processedEntities, cancellation);
}
}
public async Task RemoveEntityFromProjectionAsync(ProjectionSourceDescriptor projectionSource,
ProjectionTargetDescriptor removedProjection,
CancellationToken cancellation)
{
var(originalMetadata, metadata) = await GetMetadataAsync(removedProjection, cancellation);
if (metadata == null)
{
Assert(false);
return;
}
var removed = metadata.ProjectionSources
.RemoveFirstWhere(p => p.Id == projectionSource.SourceId &&
p.Type == projectionSource.SourceType.GetUnqualifiedTypeName());
Assert(removed != null);
if (!metadata.ProjectionSources.Any())
{
_targetMetadataCache[removedProjection] = new ProjectionTargetMetadataCacheEntry(originalMetadata,
metadata: null,
touched: true);
var predicate = DataPropertyHelper.BuildPredicate <TProjectionId, TProjection>(metadata.TargetId);
var projection = await _database.GetAsync(predicate, cancellation).FirstOrDefault();
if (projection != null)
{
_targetsToDelete.Add(projection);
//await _database.RemoveAsync(projection, cancellation);
}
}
_targetMetadataCache[removedProjection] = new ProjectionTargetMetadataCacheEntry(originalMetadata,
metadata,
touched: true);
}
