protected internal async override Task <DataReader> OnEnumerateAsync(Rse.Providers.EnumerationContext context, CancellationToken token)
{
var storageContext = (EnumerationContext)context;
var executor = storageContext.Session.Services.Demand <IProviderExecutor>();
return(await executor.ExecuteTupleReaderAsync(Request, storageContext.ParameterContext, token).ConfigureAwait(false));
}
/// <inheritdoc/>
protected override void OnBeforeEnumerate(Rse.Providers.EnumerationContext context)
{
base.OnBeforeEnumerate(context);
switch (Origin.Algorithm)
{
case IncludeAlgorithm.Auto:
var filterData = filterDataSource.Invoke().ToList();
if (filterData.Count > WellKnown.MaxNumberOfConditions)
{
LockAndStore(context, filterData);
}
else
{
context.SetValue(filterDataSource, RowFilterDataName, filterData);
}
break;
case IncludeAlgorithm.ComplexCondition:
// nothing
break;
case IncludeAlgorithm.TemporaryTable:
LockAndStore(context, filterDataSource.Invoke());
break;
default:
throw new ArgumentOutOfRangeException("Origin.Algorithm");
}
}
/// <inheritdoc/>
protected internal override DataReader OnEnumerate(Rse.Providers.EnumerationContext context)
{
var storageContext = (EnumerationContext)context;
var executor = storageContext.Session.Services.Demand <IProviderExecutor>();
return(executor.ExecuteTupleReader(Request, storageContext.ParameterContext));
}
protected async override Task <IEnumerable <Tuple> > OnEnumerateAsync(Rse.Providers.EnumerationContext context, CancellationToken token)
{
var storageContext = (EnumerationContext)context;
var executor = storageContext.Session.Services.Demand <IProviderExecutor>();
var enumerator = await executor.ExecuteTupleReaderAsync(Request, token).ConfigureAwait(false);
return(enumerator.ToEnumerable());
}
/// <inheritdoc/>
protected override IEnumerable <Tuple> OnEnumerate(Rse.Providers.EnumerationContext context)
{
var storageContext = (EnumerationContext)context;
var executor = storageContext.Session.Services.Demand <IProviderExecutor>();
var enumerator = executor.ExecuteTupleReader(Request);
using (enumerator) {
while (enumerator.MoveNext())
{
yield return(enumerator.Current);
}
}
}
protected bool ClearAndUnlock(Rse.Providers.EnumerationContext context)
{
var tableLock = context.GetValue <IDisposable>(this, TemporaryTableLockName);
if (tableLock == null)
{
return(false);
}
var storageContext = (EnumerationContext)context;
using (tableLock)
storageContext.Session.Services.Demand <IProviderExecutor>().Clear(tableDescriptor, storageContext.ParameterContext);
return(true);
}
protected void LockAndStore(Rse.Providers.EnumerationContext context, IEnumerable <Tuple> data)
{
var storageContext = (EnumerationContext)context;
var tableLock = DomainHandler.TemporaryTableManager.Acquire(storageContext, tableDescriptor);
if (tableLock == null)
{
return;
}
storageContext.SetValue(this, TemporaryTableLockName, tableLock);
var executor = storageContext.Session.Services.Demand <IProviderExecutor>();
executor.Store(tableDescriptor, data, storageContext.ParameterContext);
}
protected internal override void OnAfterEnumerate(Rse.Providers.EnumerationContext context)
{
ClearAndUnlock(context);
base.OnAfterEnumerate(context);
}
/// <inheritdoc/>
protected internal override void OnBeforeEnumerate(Rse.Providers.EnumerationContext context)
{
base.OnBeforeEnumerate(context);
LockAndStore(context, Source.ToEnumerable(context));
}
/// <inheritdoc/>
protected override void OnBeforeEnumerate(Rse.Providers.EnumerationContext context)
{
base.OnBeforeEnumerate(context);
LockAndStore(context, Source);
}