DBCacheExample

    // ------------------------------- //
    // -------- Start of File -------- //
    // ------------------------------- //
    // ----------------------------------------------------------- //
    // C++ Source Code File Name: testprog.cpp
    // Compiler Used: MSVC, BCC32, GCC HPUX aCC, SOLARIS CC
    // Produced By: DataReel Software Development Team
    // File Creation Date: 02/04/2002
    // Date Last Modified: 06/17/2016
    // Copyright (c) 2001-2016 DataReel Software Development
    // ----------------------------------------------------------- //
    // ------------- Program Description and Details ------------- //
    // ----------------------------------------------------------- //
    /*
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
    USA

    Database cache test program used to test the database file
    cache classes.
    */
    // ----------------------------------------------------------- //
    #include "gxdlcode.h"

    #if !defined (__USE_DATABASE_CACHE__)
    int main() { return 0; }
    #else

    #if defined (__USE_ANSI_CPP__) // Use the ANSI Standard C++ library
    #include <iostream>
    #include <iomanip>
    using namespace std; // Use unqualified names for Standard C++ library
    #else // Use the old iostream library by default
    #include <iostream.h>
    #include <iomanip.h>
    #endif // __USE_ANSI_CPP__

    #include <string.h>
    #include <time.h>
    #include "dbfcache.h"
    #include "gxfloat.h"
    #include "gxdbase.h"
    #include "gxdstats.h"
    #include "ustring.h"

    #ifdef __MSVC_DEBUG__
    #include "leaktest.h"
    #endif

    // Various static data area sizes used to test large files
    const FAU_t STATIC_AREA_SIZE = 0;

    // 1 GIG file test
    // WARNING: This test requires 1.1 GIG of free disk space
    // const FAU_t STATIC_AREA_SIZE = (FAU_t)1100000000;

    // 2.1 GIG file test
    // WARNING: This test requires 2.1 GIG of free disk space
    // const FAU_t STATIC_AREA_SIZE = (FAU_t)2100000000;

    // 2.3 GIG file test
    // WARNING: This test requires 2.3 GIG of free disk space
    // const __LLWORD__ STATIC_AREA_SIZE = (__LLWORD__)2147483647;

    // 4 GIG file test
    // WARNING: This test requires 4.3 GIG of free disk space
    // const __LLWORD__ STATIC_AREA_SIZE = (__LLWORD__)4294967290;

    const int NAME_LENGTH = 64;

    class DatabaseObject
    {
    public:
      DatabaseObject() { name[0] = 0; oid = (FAU)0, cid = (gxFLOAT64)0; }
      DatabaseObject(const char *s, long i, double d);

    public:
      void DisplayObject();

    public: // Platform independent data members
      char name[NAME_LENGTH]; // Fixed string type
      FAU oid;                // Integer type
      gxFLOAT64 cid;          // Floating point type
    };

    DatabaseObject::DatabaseObject(const char *s, long i, double d)
    {
      for(int j = 0; j < NAME_LENGTH; j++) name[j] = 0; // Clear the name string
      strcpy(name, s);
      oid = i;
      cid = d;
    }

    void DatabaseObject::DisplayObject()
    {
      cout << "Database object name: " << name << "\n";
      cout << "Database object OID:  " << oid << "\n";
      cout.setf(ios::showpoint | ios::fixed);
      cout.precision(3);
      cout << "Database object CID:  " << cid << "\n";
    }

    void PausePrg()
    {
      cout << "\n";
      cout << "Press enter to continue..." << "\n";
      cin.get();
    }

    int main()
    {
    #ifdef __MSVC_DEBUG__
      InitLeakTest();
    #endif

      // Adjust this number to set the number of insertions
      const unsigned long INSERTIONS = 1 * 1000;       // 1K test
      // const unsigned long INSERTIONS = 10 * 1000;      // 10K test
      // const unsigned long INSERTIONS = 100 * 1000;     // 100K test
      // const unsigned long INSERTIONS = 1000 * 1000;    // 1MEG test
      // const unsigned long INSERTIONS = 10000 * 1000;   // 10MEG test
      // const unsigned long INSERTIONS = 100000 * 1000;  // 100MEG test
      // const unsigned long INSERTIONS = 1000000 * 1000; // 1GIG test

      gxDatabase *f = new gxDatabase();
      const char *fname = "testfile.gxd";
      unsigned i;
      FAU static_area_size(STATIC_AREA_SIZE);
      DatabaseObject buf;
      UString intbuf;
      gxDatabaseSegment *ds;
      int echo_results = 0;

      cout << "\n";
      cout << "Insertion time benchmark of the database engine." << "\n";

      cout << "Creating new file..." << "\n";
      f->Create(fname, static_area_size);
      if(CheckError(f) != 0) {
        delete f;
        return 1;
      }

      const unsigned NUM_SEGMENTS = 10;
      gxDatabaseCache cache(NUM_SEGMENTS, f->GetFP());
      gxDBCacheNode p(&cache);

      PausePrg();
      DatabaseStats(f);
      PausePrg();

      cout << "Adding " << INSERTIONS << " objects to the database file..."
           << "\n";
      cout << "Size of each object = " << sizeof(DatabaseObject) << "\n";
      PausePrg();

      unsigned long curr_count = 0;
      double insert_time = 0;

      // Get CPU clock cycles before entering loop
      clock_t begin = clock();

      for(i = 0; i < INSERTIONS; i++) {
        // Construct the database object
        char name[NAME_LENGTH];
        sprintf(name, "Mouse %i", i);
        DatabaseObject ob(name, (FAU_t)i, 5000.101);

        clock_t begin_insert = clock();

        // Allocate room for the object in the data file
        FAU_t object_address = f->Alloc(sizeof(DatabaseObject));
        if(CheckError(f) != 0) {
          delete f;
          return 1;
        }

        // Write the object to the database file cache
        ds = p.CachedWrite(&ob, sizeof(DatabaseObject), object_address);

        intbuf << clear << object_address;
        if(ds) {
          if(echo_results)
    	cout << "Writing object to FAU: " << intbuf.c_str() << "\n";
        }
        else {
          cout << "Could not write object to FAU: " << intbuf.c_str() << "\n";
        }
        clock_t end_insert = clock();
        insert_time += (double)(end_insert - begin_insert) / CLOCKS_PER_SEC;
        curr_count++;

        if(CheckError(f) != 0) {
          delete f;
          return 1;
        }

        if(curr_count == 10000) {
          curr_count = 0;
          cout << "Inserted " << i << " keys in " << insert_time
    	   << " seconds" << "\n";
        }
      }

      // Get CPU clock cycles after loop is completed
      clock_t end = clock();

      // Calculate the elapsed time in seconds.
      double elapsed_time = (double)(end - begin) / CLOCKS_PER_SEC;
      cout.precision(3);
      cout << "Inserted " << i << " values in "
           << elapsed_time << " seconds" << "\n";
      double avg_insert_time = (insert_time/(double)i) * 1000;
      cout << "Average insert time = " << avg_insert_time << " milliseconds"
           << "\n";

      // Testing flush functions after a batch insert
      //  cache.Flush();

      PausePrg();

      cout << "Reading " << INSERTIONS << " objects from the database file..."
           << "\n";
      PausePrg();

      double search_time = 0;
      curr_count = 0;

      // Obtain the offset to the first object in the database file
      FAU offset = (f->GetHeapStart() + f->BlockHeaderSize());
      begin = clock();

      for(i = 0; i < INSERTIONS; i++) {
        clock_t begin_search = clock();

        // Read the object from the database file cache
        ds = p.CachedRead(offset, sizeof(DatabaseObject));
        if(ds) {
          memmove(&buf, p->ds.m_buf(), sizeof(DatabaseObject));
          if(echo_results) buf.DisplayObject();
        }
        else {
          intbuf << clear << offset;
          cout << "Could not read the cached object at FAU: " << intbuf.c_str()
    	   << "\n";
        }

        clock_t end_search = clock();
        search_time += (double)(end_search - begin_search) / CLOCKS_PER_SEC;
        if(CheckError(f) != 0) {
          delete f;
          return 1;
        }
        curr_count++;
        offset += (f->BlockHeaderSize() + sizeof(DatabaseObject));
        if(curr_count == 10000) {
          curr_count = 0;
          cout << "Read " << i << " keys in " << search_time
    	   << " seconds" << "\n";
        }
      }

      end = clock();
      elapsed_time = (double)(end - begin) / CLOCKS_PER_SEC;
      cout.precision(3);
      cout << "Verified " << i << " values in "
           << elapsed_time << " seconds" << "\n";
      double avg_search_time = (search_time/(double)i) * 1000;
      cout << "Average search time = " << avg_search_time << " milliseconds"
           << "\n";

      PausePrg();
      DatabaseStats(f);
      PausePrg();

      cout << "Exiting..." << "\n";

      // Flush the cache and release file the cache is bound to
      // before closing the file.
      cache.Flush();
      cache.ReleaseFile();

      // Close the file and check for any errors
      f->Close();
      if(CheckError(f) != 0) {
        delete f;
        return 1;
      }
      delete f; // Prevent any memory leaks

      return 0;
    }

    #endif // __USE_DATABASE_CACHE__
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    // ------------------------------- //