143 lines
3.8 KiB
C++
143 lines
3.8 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2019, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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//paragraph [10] title: [{\Large \bf ] [}]
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//paragraph [21] table1column: [\begin{quote}\begin{tabular}{l}] [\end{tabular}\end{quote}]
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//paragraph [22] table2columns: [\begin{quote}\begin{tabular}{ll}] [\end{tabular}\end{quote}]
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//paragraph [23] table3columns: [\begin{quote}\begin{tabular}{lll}] [\end{tabular}\end{quote}]
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//paragraph [24] table4columns: [\begin{quote}\begin{tabular}{llll}] [\end{tabular}\end{quote}]
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//[--------] [\hline]
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//characters [1] verbatim: [$] [$]
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//characters [2] formula: [$] [$]
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//characters [3] capital: [\textsc{] [}]
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//characters [4] teletype: [\texttt{] [}]
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//[ae] [\"a]
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//[oe] [\"o]
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//[ue] [\"u]
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//[ss] [{\ss}]
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//[<=] [\leq]
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//[#] [\neq]
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//[tilde] [\verb|~|]
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//[Contents] [\tableofcontents]
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1 Header File: ParNodeInfo
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September 2019, Fischer Thomas
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1.1 Overview
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The ParNodeInfo is the data structure defined for the local2 space of the ~par~-
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operator.
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*/
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#ifndef SECONDO_PARTHREAD_PARNODEINFO_H
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#define SECONDO_PARTHREAD_PARNODEINFO_H
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namespace parthread
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{
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/*
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1.2 Prototypes
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*/
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class ExecutionContext;
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class ExecutionContextEntity;
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class ConcurrentTupleBufferReader;
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class ParNodeInfo
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{
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public:
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/*
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1.3 Initialization and destruction
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The ParNodeInfo is initialized with the object of the connected
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execution context. This allows the par-operator to call the
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following subtree.
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*/
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ParNodeInfo(parthread::ExecutionContext *connectedContext)
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: m_reader(0), m_currentEntity(0),
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m_connectedContext(connectedContext)
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{
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}
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~ParNodeInfo() = default;
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/*
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The destructor is not needed. Other codeparts are responsible for deleting
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the members this data structure
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1.4 Properties
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*/
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ExecutionContext *ConnectedContext()
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{
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return m_connectedContext;
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}
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/*
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Gets a reference to the execution context connected to this ~par~-node.
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The execution context is the same for all entities of this node.
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*/
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ExecutionContextEntity *CurrentEntity()
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{
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return m_currentEntity;
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}
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void CurrentEntity(ExecutionContextEntity *entity)
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{
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m_currentEntity = entity;
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}
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/*
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Gets and sets a reference to the entity containing the subtree where
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this par node is a leaf node.
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*/
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ConcurrentTupleBufferReader *TupleReader()
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{
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return m_reader;
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}
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void TupleReader(ConcurrentTupleBufferReader *reader)
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{
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m_reader = reader;
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}
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/*
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Gets and sets the tuple reader. The reader is unique for this
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~par~ node and instance. It represents the connection to the tuple-
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buffer and is used by the par-operator to retrieve tuples from the
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connected context.
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*/
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private:
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ConcurrentTupleBufferReader *m_reader;
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ExecutionContextEntity *m_currentEntity;
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ExecutionContext *m_connectedContext;
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};
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} // namespace parthread
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#endif
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