/// <summary>
/// Creates an instance of a DynamicView. Must call <see cref="StartAsync"/> to send
/// initial <see cref="DataEventTransaction"/> instance and listen for new <see cref="DataEventTransaction"/>instances.
/// </summary>
public DynamicView CreateDynamicView(string sql, dynamic values = null, string name = null, string[] keyFieldNames = null)
{
DynamicView dynamicQuery = new DynamicView(this, sql, values, name, keyFieldNames);
this.dynamicViews.Add(dynamicQuery);
return(dynamicQuery);
}
protected async Task <DataEvent[]> GetInitialDataEventsAsync(DynamicView dynamicView)
{
DataEvent[] initialDataEvents = await dynamicView.GetInitialDataEventsAsync();
dynamicView.ResetDirtyParams();
dynamicView.UpdateChildDynamicParams(initialDataEvents);
return(initialDataEvents);
}
protected DataEvent[] CreateDynamicViewDataEvents(DataEventTransaction dataEventTransaction, DynamicView dynamicView)
{
logger.Trace($"RunAsync():dynamicView.name={dynamicView.Name}");
List <DataEvent> newRecordDataEvents = new List <DataEvent>();
// Don't send data events if DynamicView has dirty params because
// the DynamicView will be requeried anyways
if (!dynamicView.HasDirtyParams)
{
HashSet <string> newRecordDataEventFullKeys = new HashSet <string>();
foreach (var dataEvent in dataEventTransaction.dataEvents)
{
if (dataEvent is KeyValueDataEvent keyValueDataEvent && dynamicView.TryGetDynamicStatementFromRef(keyValueDataEvent.name, out StatementFromRef dynamicStatementFromRef))
{
// Fetch the preCommitImpactedRecords
Dict[] preCommitImpactedRecords = null;
if (HasImpactedRecords(TransactionState.Uncommitted, dataEvent, dynamicStatementFromRef.joinType))
{
string storageKey = GetImpactedRecordsStorageKey(dynamicView, dataEvent, TransactionState.Uncommitted);
preCommitImpactedRecords = (Dict[])dataEventTransaction.Fetch(storageKey);
}
// Fetch the postCommitImpactedRecords
Dict[] postCommitImpactedRecords = null;
if (HasImpactedRecords(TransactionState.Committed, dataEvent, dynamicStatementFromRef.joinType))
{
string storageKey = GetImpactedRecordsStorageKey(dynamicView, dataEvent, TransactionState.Committed);
postCommitImpactedRecords = (Dict[])dataEventTransaction.Fetch(storageKey);
}
// Determine the changes from each data event on each dynamic select
RecordDataEvent[] recordDataEvents = dynamicView.ProcessDataChange(dataEvent, preCommitImpactedRecords, postCommitImpactedRecords);
if (recordDataEvents != null)
{
dynamicView.UpdateChildDynamicParams(recordDataEvents);
foreach (var recordDataEvent in recordDataEvents)
{
string fullKey = $"{recordDataEvent.name}:{recordDataEvent.keyValue}";
if (!newRecordDataEventFullKeys.Contains(fullKey))
{
newRecordDataEventFullKeys.Add(fullKey);
newRecordDataEvents.Add(recordDataEvent);
}
}
}
}
}
}
return(newRecordDataEvents.ToArray());
}
protected string GetImpactedRecordsStorageKey(DynamicView dynamicView, DataEvent dataEvent, TransactionState transactionState)
{
return($"{dynamicView.Id} {dataEvent.id} {transactionState}");
}