89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
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/*
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----
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This file is part of SECONDO.
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Copyright (C) 2019,
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University in Hagen,
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Faculty of Mathematics and 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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*/
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#pragma once
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#include "Stream.h"
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template<class T>
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class SyncStream{
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public:
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SyncStream(Word& w) : stream(w), endReached(true){}
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~SyncStream(){
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}
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void open(){
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boost::lock_guard<boost::mutex> guard(mtx);
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endReached = false;
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stream.open();
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}
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void close(){
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boost::lock_guard<boost::mutex> guard(mtx);
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endReached = true;
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stream.close();
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}
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T* request(){
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boost::lock_guard<boost::mutex> guard(mtx);
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T* res;
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if(endReached){
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res = 0;
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} else {
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res = stream.request();
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if(res==0){
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endReached = true;
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}
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}
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return res;
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}
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void request(std::vector<T*>& buffer, int elems){
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boost::lock_guard<boost::mutex> guard(mtx);
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buffer.clear();
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if(endReached){
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buffer.push_back(nullptr);
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return;
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}
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for( int i=0;i<elems && !endReached; i++){
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T* res = stream.request();
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if(res==0){
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endReached = true;
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}
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buffer.push_back(res);
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}
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}
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private:
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Stream<T> stream;
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bool endReached;
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boost::mutex mtx;
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};
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