1 #pragma once 2 3 #include <map> 4 #include <mutex> 5 6 #include "accessor.h" 7 #include "pager.h" 8 #include "page_mapper.h" 9 10 11 12 /* Mapping type from accessors to page mappers. */ 13 14 typedef std::map<fileid_t, PageMapper *> FileMapping; 15 typedef std::pair<fileid_t, PageMapper *> FileMappingEntry; 16 17 18 19 /* A registry of mappers for accessors. */ 20 21 class FilePaging 22 { 23 protected: 24 Pages *_pages; 25 26 FileMapping _mappers; 27 std::mutex _lock; 28 29 /* Pager initialisation methods. */ 30 31 PageMapper *get_mapper(fileid_t fileid); 32 33 Pager *get_pager(fileid_t fileid, flags_t flags); 34 35 /* Configurable methods. */ 36 37 virtual fileid_t get_fileid(const char *path) = 0; 38 39 virtual Accessor *make_accessor(fileid_t fileid) = 0; 40 41 /* Mapper registry access. */ 42 43 PageMapper *get(fileid_t fileid); 44 45 void set(fileid_t fileid, PageMapper *mapper); 46 47 public: 48 explicit FilePaging(Pages *pages); 49 50 virtual ~FilePaging() 51 { 52 } 53 54 /* Methods for the pager. */ 55 56 void detach_pager(fileid_t fileid, PageMapper *mapper); 57 }; 58 59 // vim: tabstop=4 expandtab shiftwidth=4