Last change
on this file since 4 was 4, checked in by sjboddie, 26 years ago |
Initial revision
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Property svn:executable
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Author Date Id Revision
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File size:
1.4 KB
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[4] | 1 | #include "querycache.h"
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| 2 |
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| 3 |
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| 4 |
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| 5 | resultcacheel::resultcacheel ()
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| 6 | {
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| 7 | accessnum = -1;
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| 8 | }
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| 9 |
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| 10 |
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| 11 |
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| 12 | querycache::querycache (int themaxcachesize)
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| 13 | {
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| 14 | if (themaxcachesize < 1) themaxcachesize = 1;
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| 15 |
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| 16 | resultcache = new resultcacheel[themaxcachesize];
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| 17 |
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| 18 | maxcachesize = themaxcachesize;
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| 19 | nextaccessnum = 1;
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| 20 | }
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| 21 |
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| 22 | querycache::~querycache ()
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| 23 | {
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| 24 | delete [] resultcache;
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| 25 | }
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| 26 |
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| 27 | // returns true if the query was found in the cache
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| 28 | // if the query was found then queryresults contains
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| 29 | // the results
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| 30 | bool querycache::find (const queryparamclass &queryparams,
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| 31 | queryresultsclass &queryresults)
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| 32 | {
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| 33 | int i;
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| 34 |
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| 35 | for (i=0; i < maxcachesize; i++)
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| 36 | {
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| 37 | if (resultcache[i].queryparameters == queryparams)
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| 38 | {
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| 39 | queryresults = resultcache[i].queryresults;
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| 40 | resultcache[i].accessnum = getnextaccessnum ();
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| 41 | return true;
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| 42 | }
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| 43 | }
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| 44 |
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| 45 | return false;
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| 46 | }
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| 47 |
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| 48 |
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| 49 | void querycache::cache (const queryparamclass &queryparams,
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| 50 | const queryresultsclass &queryresults)
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| 51 | {
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| 52 | int i = getfreecachenum();
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| 53 | resultcache[i].queryparameters = queryparams;
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| 54 | resultcache[i].queryresults = queryresults;
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| 55 | resultcache[i].accessnum = getnextaccessnum ();
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| 56 | }
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| 57 |
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| 58 | int querycache::getnextaccessnum ()
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| 59 | {
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| 60 | return nextaccessnum++;
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| 61 | }
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| 62 |
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| 63 | int querycache::getfreecachenum ()
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| 64 | {
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| 65 | int i;
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| 66 | int minaccessnum = 0;
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| 67 | int minaccessi = 0;
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| 68 |
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| 69 | for (i=0; i < maxcachesize; i++)
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| 70 | {
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| 71 | if (resultcache[i].accessnum < minaccessnum)
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| 72 | minaccessi = i;
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| 73 | }
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| 74 |
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| 75 | return i;
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| 76 | }
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| 77 |
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