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144 lines
4.2 KiB
C++
144 lines
4.2 KiB
C++
// Matt Wells, copyright Oct 2001
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// . used for looking up IndexLists for queries
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// . call init() to get initial read info per IndexList (1 per termId in query)
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// . call update() to update read info for next read of lists
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// . use getStartKey() , getEndKey(), getNumRecsToRead() to extract read info
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// . tries to keep the amount of reading to a minimal
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// . if # of results is not achieved the call update() to get read info for
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// another read to hopefully get the # of requested docIds
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#ifndef _INDEXREADINFO_H_
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#define _INDEXREADINFO_H_
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#include "Query.h" // MAX_QUERY_TERMS
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#include "IndexList.h"
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#include "Titledb.h"
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#include "Indexdb.h"
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// how many tiered might we break an indexlist into?
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#define MAX_TIERS 3
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// . define read sizes of each stage
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// . each docid is 6 bytes, but first is 12
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// . stage0 was 5000, but made it 8000 for trek today,
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// . let's see how the powers of ten perform
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#define STAGE0 (10000 *6)
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#define STAGE1 (100000 *6)
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#define STAGE2 (1000000 *6)
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#define STAGESUM (STAGE0 + STAGE1 + STAGE2) // + STAGE3)
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class IndexReadInfo {
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public:
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// just sets m_numLists to 0
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IndexReadInfo();
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// . this will calculate minStartKey and maxEndKey for each termId
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// . does not copy these, so don't trash this stack
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// . "stage0" is the first # of docIds to read from each IndexList
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// -- dynamic truncation
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void init ( Query *q ,
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long long *termFreqs ,
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long docsWanted , char callNum , long stage0 ,
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long *tierStage ,
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bool useDateLists ,
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bool sortByDate ,
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unsigned long date1 ,
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unsigned long date2 ,
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bool isDebug );
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// . this updates the start keys and docsToRead for each list
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// in preparation for another read
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// . call this after you've done a read and called
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// IndexTable::addLists() so it can hash them and calculate the #
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// of results it got
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// . it advances m_startKey[i] to lastKey + 1 in lists[i]
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void update ( IndexList *lists , long numLists , char callNum );
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void update2 ( long tier ) ;
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/* void updateForMsg3b ( char *lastParts,
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long long *termFreqs,
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long numLists );*/
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void update ( long long *termFreqs,
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long numLists,
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char callNum );
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// update without the full lists, just the last part and size
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void update ( char *lastParts,
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long *listSizes,
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long numLists );
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// call this after calling update to determine read info per list
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char *getStartKeys ( ) { return (char *)m_startKeys ; };
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char *getEndKeys ( ) { return (char *)m_endKeys ; };
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char getIgnored ( long i ) { return m_ignore[i] ; };
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char getHalfKeySize( ) { return m_hks ; };
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// getting info directly, like above
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long getReadSize ( long i ) { return m_readSizes[i]; };
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long *getReadSizes( ) { return m_readSizes; };
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// . did we get the # of required results
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// . or are all our lists exhausted?
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// . call only AFTER calling update() above
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bool isDone ( ) { return m_isDone ; };
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// call only after calling init() to estimate # of results
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long long getEstimatedTotalHits();
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long getNumLists () { return m_numLists; };
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long getStage0Default ( ) ;
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private:
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// . reading positions to read next portion of each list
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// . set initially by init()
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// . updated by addLists
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// . might read one list multiple tims if we don't get enough hits
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//key_t m_startKeys [ MAX_QUERY_TERMS ];
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//key_t m_endKeys [ MAX_QUERY_TERMS ];
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//key128_t m_startKeys2 [ MAX_QUERY_TERMS ];
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//key128_t m_endKeys2 [ MAX_QUERY_TERMS ];
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char m_startKeys [ MAX_QUERY_TERMS * MAX_KEY_BYTES ];
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char m_endKeys [ MAX_QUERY_TERMS * MAX_KEY_BYTES ];
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// how many docIds/recs/keys should we read?
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long m_readSizes [ MAX_QUERY_TERMS ];
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char m_ignore [ MAX_QUERY_TERMS ];
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// . the query we're doing
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// . the above arrays are 1-1 with the arrays in m_q, 1 for each termId
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Query *m_q;
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// how many index lists we're reading
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long m_numLists;
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// may be set to true after update() is called
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bool m_isDone;
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// . for dynamic truncation, first # of docs to read from each list
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// . stages can now be set dynamically on a per query basis
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long m_stage[MAX_TIERS];
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//long m_stageSum;
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char m_ks;
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char m_hks;
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char m_useDateLists;
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char m_sortByDate;
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unsigned long m_date1;
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unsigned long m_date2;
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bool m_isDebug;
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};
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#endif
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