/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Nov 27, 2011
*/
package com.bigdata.rdf.sparql.ast.hints;
import com.bigdata.bop.PipelineOp;
import com.bigdata.rdf.sparql.ast.ASTBase;
import com.bigdata.rdf.sparql.ast.QueryRoot;
import com.bigdata.rdf.sparql.ast.StatementPatternNode;
import com.bigdata.rdf.sparql.ast.eval.AST2BOpContext;
/**
* For a pipelined operator, this is the maximum number of messages that will be
* assigned to a single invocation of the evaluation task for that operator.
*
* @see PipelineOp.Annotations#MAX_MESSAGES_PER_TASK
*/
final class PipelineMaxMessagesPerTaskHint extends AbstractIntQueryHint {
protected PipelineMaxMessagesPerTaskHint() {
super(PipelineOp.Annotations.MAX_MESSAGES_PER_TASK,
PipelineOp.Annotations.DEFAULT_MAX_MESSAGES_PER_TASK);
}
@Override
public void handle(final AST2BOpContext context,
final QueryRoot queryRoot,
final QueryHintScope scope, final ASTBase op, final Integer value) {
if (op instanceof StatementPatternNode) {
/*
* Note: This is set on the queryHint Properties object and then
* transferred to the pipeline operator when it is generated.
*/
_setQueryHint(context, scope, op, getName(), value);
}
// if (QueryHintScope.Query.equals(scope)) {
//
// /*
// * Also stuff the query hint on the global context for things which
// * look there.
// */
//
// conditionalSetGlobalProperty(context, getName(), value);
//
// }
}
}