// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: cachedb.h,v 1.2 2001/02/20 07:03:18 jgg Exp $ /* ###################################################################### CacheDB Simple uniform interface to a cache database. ##################################################################### */ /*}}}*/ #ifndef CACHEDB_H #define CACHEDB_H #ifdef __GNUG__ #pragma interface "cachedb.h" #endif #include <db2/db.h> #include <string> #include <apt-pkg/debfile.h> #include <inttypes.h> #include <sys/stat.h> #include <errno.h> #include "contents.h" class CacheDB { protected: // Database state/access DBT Key; DBT Data; char TmpKey[600]; DB *Dbp; bool DBLoaded; bool ReadOnly; string DBFile; // Generate a key for the DB of a given type inline void InitQuery(const char *Type) { memset(&Key,0,sizeof(Key)); memset(&Data,0,sizeof(Data)); Key.data = TmpKey; Key.size = snprintf(TmpKey,sizeof(TmpKey),"%s:%s",Type,FileName.c_str()); } inline bool Get() { return Dbp->get(Dbp,0,&Key,&Data,0) == 0; }; inline bool Put(const void *In,unsigned long Length) { if (ReadOnly == true) return true; Data.size = Length; Data.data = (void *)In; if (DBLoaded == true && (errno = Dbp->put(Dbp,0,&Key,&Data,0)) != 0) { DBLoaded = false; return false; } return true; } // Stat info stored in the DB, Fixed types since it is written to disk. enum FlagList {FlControl = (1<<0),FlMD5=(1<<1),FlContents=(1<<2)}; struct StatStore { uint32_t st_mtime; uint32_t Flags; } CurStat; struct StatStore OldStat; // 'set' state string FileName; struct stat FileStat; FileFd *Fd; debDebFile *DebFile; public: // Data collection helpers debDebFile::MemControlExtract Control; ContentsExtract Contents; // Runtime statistics struct Stats { double Bytes; double MD5Bytes; unsigned long Packages; unsigned long Misses; unsigned long DeLinkBytes; inline void Add(const Stats &S) {Bytes += S.Bytes; MD5Bytes += S.MD5Bytes; Packages += S.Packages; Misses += S.Misses; DeLinkBytes += S.DeLinkBytes;}; Stats() : Bytes(0), MD5Bytes(0), Packages(0), Misses(0), DeLinkBytes(0) {}; } Stats; bool ReadyDB(string DB); inline bool DBFailed() {return Dbp != 0 && DBLoaded == false;}; inline bool Loaded() {return DBLoaded == true;}; bool SetFile(string FileName,struct stat St,FileFd *Fd); bool LoadControl(); bool LoadContents(bool GenOnly); bool GetMD5(string &MD5Res,bool GenOnly); bool Finish(); bool Clean(); CacheDB(string DB) : Dbp(0), DebFile(0) {ReadyDB(DB);}; ~CacheDB() {ReadyDB(string()); delete DebFile;}; }; #endif