public async Task <DateTime?> FetchSince(DateTime cursor)
{
using (_logger.Scope("Processing manual status changes."))
{
var manualChangesQuery = _table
.CreateQuery <ManualStatusChangeEntity>();
// Table storage throws on queries with DateTime values that are too low.
// If we are fetching manual changes for the first time, don't filter on the timestamp.
if (cursor > DateTime.MinValue)
{
manualChangesQuery = manualChangesQuery.Where(c => c.Timestamp > new DateTimeOffset(cursor, TimeSpan.Zero));
}
var manualChanges = manualChangesQuery.ToList();
_logger.LogInformation("Processing {ManualChangesCount} manual status changes.", manualChanges.Count());
foreach (var manualChange in manualChanges.OrderBy(m => m.Timestamp))
{
await _handler.Handle(_table, manualChange);
}
return(manualChanges.Any() ? manualChanges.Max(c => c.Timestamp.UtcDateTime) : (DateTime?)null);
}
}
public static IQueryable <TEntity> GetActiveEntities <TEntity>(this ITableWrapper table)
where TEntity : ComponentAffectingEntity, new()
{
return(table
.CreateQuery <TEntity>()
.Where(e => e.IsActive));
}
public static IQueryable <TChild> GetChildEntities <TChild, TParent>(this ITableWrapper table, TParent entity)
where TChild : ITableEntity, IChildEntity <TParent>, new()
where TParent : ITableEntity
{
return(table
.CreateQuery <TChild>()
.Where(e => e.ParentRowKey == entity.RowKey));
}
public IEnumerable <Event> Export(DateTime cursor)
{
return(_table
.CreateQuery <EventEntity>()
.Where(e => e.IsActive || (e.EndTime >= cursor - _eventVisibilityPeriod))
.ToList()
.Select(_exporter.Export)
.Where(e => e != null)
.ToList());
}
public async Task <TAggregationEntity> GetAsync(ParsedIncident input)
{
TAggregationEntity aggregationEntity = null;
var possiblePath = _aggregationPathProvider.Get(input);
// Find an aggregation to link to
var possibleAggregationsQuery = _table
.CreateQuery <TAggregationEntity>()
.Where(e =>
// The aggregation must affect the same path
e.AffectedComponentPath == possiblePath &&
// The aggregation must begin before or at the same time
e.StartTime <= input.StartTime);
// The aggregation must cover the same time period
if (input.IsActive)
{
// An active input can only be linked to an active aggregation
possibleAggregationsQuery = possibleAggregationsQuery
.Where(e => e.IsActive);
}
else
{
// An inactive input can be linked to an active aggregation or an inactive aggregation that ends after it
possibleAggregationsQuery = possibleAggregationsQuery
.Where(e =>
e.IsActive ||
e.EndTime >= input.EndTime);
}
var possibleAggregations = possibleAggregationsQuery
.ToList();
_logger.LogInformation("Found {AggregationCount} possible aggregations to link entity to with path {AffectedComponentPath}.", possibleAggregations.Count(), possiblePath);
foreach (var possibleAggregation in possibleAggregations)
{
if (await _strategy.CanBeAggregatedByAsync(input, possibleAggregation))
{
_logger.LogInformation("Linking entity to aggregation.");
aggregationEntity = possibleAggregation;
break;
}
}
if (aggregationEntity == null)
{
_logger.LogInformation("Could not find existing aggregation to link to, creating new aggregation to link entity to.");
aggregationEntity = await _aggregationFactory.CreateAsync(input);
_logger.LogInformation("Created new aggregation {AggregationRowKey} to link entity to.", aggregationEntity.RowKey);
}
return(aggregationEntity);
}