1 /***************************************************************************
2 * Copyright (C) 2007 by www.databasecache.com *
3 * Contact: praba_tuty@databasecache.com *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 ***************************************************************************/
46 BucketIter(HashIndexNode
*head
) { iter
= head
;}
47 HashIndexNode
* next();
48 friend class BucketList
;
54 BucketList(){ head
= NULL
;}
55 BucketList(HashIndexNode
*h
){ head
= h
; }
56 void *getBucketListHead(){ return head
;}
57 DbRetVal
insert(Chunk
*chunk
, Database
*db
, void *key
, void *tuple
);
58 DbRetVal
remove(Chunk
*chunk
, Database
*db
, void *key
);
59 BucketIter
getIterator()
71 // create (one) object for each indexing mechanisms here
72 // Also need to make changes to getIndex() and destroy() methods
73 // accordingly for new index machanism.
74 static HashIndex
*hIdx
;
75 static long usageCount
;
77 static Index
* getIndex(IndexType type
);
78 static void init() { usageCount
++; }
79 static void destroy() {
82 if(!hIdx
) { delete hIdx
; hIdx
=NULL
; }
85 virtual DbRetVal
insert(TableImpl
*tbl
, Transaction
*tr
, void *indexPtr
, IndexInfo
*info
, void *tuple
, bool undoFlag
)=0;
86 virtual DbRetVal
remove(TableImpl
*tbl
, Transaction
*tr
, void *indexPtr
, IndexInfo
*info
, void *tuple
, bool undoFlag
)=0;
87 virtual DbRetVal
update(TableImpl
*tbl
, Transaction
*tr
, void *indexPtr
, IndexInfo
*info
, void *tuple
, bool undoFlag
)=0;
89 class HashIndex
: public Index
93 DbRetVal
insert(TableImpl
*tbl
, Transaction
*tr
, void *indexPtr
, IndexInfo
*info
, void *tuple
, bool undoFlag
);
94 DbRetVal
remove(TableImpl
*tbl
, Transaction
*tr
, void *indexPtr
, IndexInfo
*info
, void *tuple
, bool undoFlag
);
95 DbRetVal
update(TableImpl
*tbl
, Transaction
*tr
, void *indexPtr
, IndexInfo
*info
, void *tuple
, bool undoFlag
);
96 static unsigned int computeHashBucket(DataType type
, void *key
, int noOfBuckets
, int length
=0);
113 //Used by TableImpl to cache information related to hash indexes on that table
114 class HashIndexInfo
:public IndexInfo
117 FieldList idxFldList
;
127 printf("HashIndexInfo indexPtr:%x noOfBuckets:%d buckets:%x \n",indexPtr
, noOfBuckets
, buckets
);