/// <summary>
/// Creates a new Join
/// </summary>
/// <param name="lhs">Left Hand Side</param>
/// <param name="rhs">Right Hand Side</param>
public ParallelJoin(ISparqlAlgebra lhs, ISparqlAlgebra rhs)
{
if (!lhs.Variables.IsDisjoint(rhs.Variables)) throw new RdfQueryException("Cannot create a ParallelJoin between two algebra operators which are not distinct");
this._lhs = lhs;
this._rhs = rhs;
this._d = new ParallelEvaluateDelegate(this.ParallelEvaluate);
}
/// <summary>
/// Creates a new Join.
/// </summary>
/// <param name="lhs">Left Hand Side.</param>
/// <param name="rhs">Right Hand Side.</param>
public ParallelJoin(ISparqlAlgebra lhs, ISparqlAlgebra rhs)
{
if (!lhs.Variables.IsDisjoint(rhs.Variables))
{
throw new RdfQueryException("Cannot create a ParallelJoin between two algebra operators which are not distinct");
}
_lhs = lhs;
_rhs = rhs;
_d = new ParallelEvaluateDelegate(ParallelEvaluate);
}
/// <summary>
/// Evaluates the Union
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public BaseMultiset Evaluate(SparqlEvaluationContext context)
{
//Create a copy of the evaluation context for the RHS
SparqlEvaluationContext context2 = new SparqlEvaluationContext(context.Query, context.Data, context.Processor);
if (!(context.InputMultiset is IdentityMultiset))
{
context2.InputMultiset = new Multiset();
foreach (ISet s in context.InputMultiset.Sets)
{
context2.InputMultiset.Add(s.Copy());
}
}
List <Uri> activeGraphs = context.Data.ActiveGraphUris.ToList();
List <Uri> defaultGraphs = context.Data.DefaultGraphUris.ToList();
ParallelEvaluateDelegate d = new ParallelEvaluateDelegate(this.ParallelEvaluate);
IAsyncResult lhs = d.BeginInvoke(this._lhs, context, activeGraphs, defaultGraphs, null, null);
IAsyncResult rhs = d.BeginInvoke(this._rhs, context2, activeGraphs, defaultGraphs, null, null);
WaitHandle.WaitAll(new WaitHandle[] { lhs.AsyncWaitHandle, rhs.AsyncWaitHandle });
bool rhsOk = false;
try
{
BaseMultiset lhsResult = d.EndInvoke(lhs);
rhsOk = true;
BaseMultiset rhsResult = d.EndInvoke(rhs);
context.CheckTimeout();
context.OutputMultiset = lhsResult.Union(rhsResult);
context.CheckTimeout();
context.InputMultiset = context.OutputMultiset;
return(context.OutputMultiset);
}
catch
{
if (!rhsOk)
{
//Clean up the RHS evaluation call if the LHS has errored
try
{
d.EndInvoke(rhs);
}
catch
{
//Ignore this error as we're already going to throw the other error
}
}
throw;
}
}
/// <summary>
/// Evaluates the Union
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public BaseMultiset Evaluate(SparqlEvaluationContext context)
{
//Create a copy of the evaluation context for the RHS
SparqlEvaluationContext context2 = new SparqlEvaluationContext(context.Query, context.Data, context.Processor);
if (!(context.InputMultiset is IdentityMultiset))
{
context2.InputMultiset = new Multiset();
foreach (ISet s in context.InputMultiset.Sets)
{
context2.InputMultiset.Add(s.Copy());
}
}
IGraph activeGraph = context.Data.ActiveGraph;
IGraph defaultGraph = context.Data.DefaultGraph;
ParallelEvaluateDelegate d = new ParallelEvaluateDelegate(this.ParallelEvaluate);
IAsyncResult lhs = d.BeginInvoke(this._lhs, context, activeGraph, defaultGraph, null, null);
IAsyncResult rhs = d.BeginInvoke(this._rhs, context2, activeGraph, defaultGraph, null, null);
WaitHandle.WaitAll(new WaitHandle[] { lhs.AsyncWaitHandle, rhs.AsyncWaitHandle });
bool rhsOk = false;
try
{
BaseMultiset lhsResult = d.EndInvoke(lhs);
rhsOk = true;
BaseMultiset rhsResult = d.EndInvoke(rhs);
context.CheckTimeout();
context.OutputMultiset = lhsResult.Union(rhsResult);
context.CheckTimeout();
context.InputMultiset = context.OutputMultiset;
return context.OutputMultiset;
}
catch
{
if (!rhsOk)
{
//Clean up the RHS evaluation call if the LHS has errored
try
{
d.EndInvoke(rhs);
}
catch
{
//Ignore this error as we're already going to throw the other error
}
}
throw;
}
}
