// Constructors
// ReSharper disable MemberCanBeProtected.Global
public SubQuery(ProjectionExpression projectionExpression, TranslatedQuery query, Parameter <Tuple> parameter, Tuple tuple, ItemMaterializationContext context)
// ReSharper restore MemberCanBeProtected.Global
{
this.provider = context.Session.Query.Provider;
var tupleParameterBindings = new Dictionary <Parameter <Tuple>, Tuple>(projectionExpression.TupleParameterBindings);
var currentTranslatedQuery = query;
var outerParameterContext = context.ParameterContext;
var parameterContext = new ParameterContext(outerParameterContext);
// Gather Parameter<Tuple> values from current ParameterScope for future use.
outerParameterContext.SetValue(parameter, tuple);
foreach (var tupleParameter in currentTranslatedQuery.TupleParameters)
{
var value = outerParameterContext.GetValue(tupleParameter);
tupleParameterBindings[tupleParameter] = value;
parameterContext.SetValue(tupleParameter, value);
}
this.projectionExpression = new ProjectionExpression(
projectionExpression.Type,
projectionExpression.ItemProjector,
tupleParameterBindings,
projectionExpression.ResultAccessMethod);
var translatedQuery = new TranslatedQuery(
query.DataSource,
query.Materializer,
query.ResultAccessMethod,
tupleParameterBindings,
EnumerableUtils <Parameter <Tuple> > .Empty);
delayedQuery = new DelayedQuery <TElement>(context.Session, translatedQuery, parameterContext);
context.Session.RegisterUserDefinedDelayedQuery(delayedQuery.Task);
context.MaterializationContext.MaterializationQueue.Enqueue(MaterializeSelf);
}
private void MaterializeSelf()
{
if (materializedSequence != null)
{
return;
}
materializedSequence = delayedQuery.ToList();
delayedQuery = null;
}
/// <summary>
/// Tries connecting to a peer specified by an IP end point. If the peer is already connected, it will be immediately returned. If
/// a connection can not be made, the query will be cancelled.
/// </summary>
public Query<UDPPeer> Connect(IPEndPoint EndPoint)
{
UDPPeer peer;
if (this._Peers.TryGetValue(EndPoint, out peer))
{
return peer;
}
_ConnectionRequest cr;
if (this._ConnectionRequests.TryGetValue(EndPoint, out cr))
{
// If there is already a connection request, reset the timeout
cr.Remain = this._Settings.ConnectionRequestTimeout;
return cr.Query;
}
else
{
UDPHubSettings settings = this._Settings;
DelayedQuery<UDPPeer> query = new DelayedQuery<UDPPeer>();
this._ConnectionRequests[EndPoint] = cr = new _ConnectionRequest
{
AcknowledgementNumber = settings.Random.Integer(),
Delay = 0.0,
Query = query,
Remain = settings.ConnectionRequestTimeout,
Time = 0.0
};
return query;
}
}