Clifford Yapp
d962ea0381
Materializing each instance repeated the same FILE_SCHEMA warning. Keep a thread-safe claim flag on the lazy file reader so concurrent loads and multiple DATA sections report the ambiguity once per input file.
85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
#ifndef LAZYFILEREADER_H
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#define LAZYFILEREADER_H
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#include <atomic>
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#include <vector>
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#include <string>
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#include <cstdlib>
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#include "sc_export.h"
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// PART 21
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#include "cllazyfile/lazyP21DataSectionReader.h"
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#include "cllazyfile/p21HeaderSectionReader.h"
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#include "cllazyfile/headerSectionReader.h"
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/* // PART 28
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* #include "lazyP28DataSectionReader.h"
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* #include "p28HeaderSectionReader.h"
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*/
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class lazyInstMgr;
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class Registry;
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class headerSectionReader;
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///read an exchange file of any supported type (currently only p21)
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///for use only from within lazyInstMgr
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class SC_LAZYFILE_EXPORT lazyFileReader {
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protected:
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#ifdef _MSC_VER
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#pragma warning( push )
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#pragma warning( disable: 4251 )
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#endif
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std::string _fileName;
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lazyInstMgr * _parent;
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headerSectionReader * _header;
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std::ifstream _file;
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std::atomic<bool> _schemaWarningClaimed;
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#ifdef _MSC_VER
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#pragma warning( pop )
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#endif
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fileTypeEnum _fileType;
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fileID _fileID;
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lazyFileOffset _fileSize;
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bool _valid;
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void initP21();
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///TODO detect file type; for now, assume all are Part 21
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void detectType() {
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_fileType = Part21;
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}
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public:
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fileID ID() const {
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return _fileID;
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}
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lazyFileOffset fileSize() const {
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return _fileSize;
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}
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bool valid() const {
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return _valid;
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}
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instancesLoaded_t * getHeaderInstances();
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lazyFileReader( std::string fname, lazyInstMgr * i, fileID fid );
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~lazyFileReader();
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fileTypeEnum type() const {
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return _fileType;
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}
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lazyInstMgr * getInstMgr() const {
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return _parent;
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}
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/** Return true only to the first caller reporting a FILE_SCHEMA
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* selection warning for this file. Instance materialization may
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* occur concurrently and span multiple DATA sections. */
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bool claimSchemaWarning() {
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return !_schemaWarningClaimed.exchange( true,
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std::memory_order_relaxed );
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}
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bool needKW( const char * kw );
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};
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#endif //LAZYFILEREADER_H
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