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Wrap calls to SearchSysCache and related functions using macros.

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The purpose of this change is to eliminate the need for every caller
of SearchSysCache, SearchSysCacheCopy, SearchSysCacheExists,
GetSysCacheOid, and SearchSysCacheList to know the maximum number
of allowable keys for a syscache entry (currently 4).  This will
make it far easier to increase the maximum number of keys in a
future release should we choose to do so, and it makes the code
shorter, too.

Design and review by Tom Lane.
This commit is contained in:
Robert Haas
2010-02-14 18:42:19 +00:00
parent 1012492bc0
commit e26c539e9f
97 changed files with 1125 additions and 2061 deletions
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52
src/include/utils/syscache.h
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@@ -9,7 +9,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/syscache.h,v 1.78 2010/01/05 21:54:00 rhaas Exp $
* $PostgreSQL: pgsql/src/include/utils/syscache.h,v 1.79 2010/02/14 18:42:18 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -113,6 +113,56 @@ extern Datum SysCacheGetAttr(int cacheId, HeapTuple tup,
extern struct catclist *SearchSysCacheList(int cacheId, int nkeys,
Datum key1, Datum key2, Datum key3, Datum key4);
/*
* The use of the macros below rather than direct calls to the corresponding
* functions is encouraged, as it insulates the caller from changes in the
* maximum number of keys.
*/
#define SearchSysCache1(cacheId, key1) \
SearchSysCache(cacheId, key1, 0, 0, 0)
#define SearchSysCache2(cacheId, key1, key2) \
SearchSysCache(cacheId, key1, key2, 0, 0)
#define SearchSysCache3(cacheId, key1, key2, key3) \
SearchSysCache(cacheId, key1, key2, key3, 0)
#define SearchSysCache4(cacheId, key1, key2, key3, key4) \
SearchSysCache(cacheId, key1, key2, key3, key4)
#define SearchSysCacheCopy1(cacheId, key1) \
SearchSysCacheCopy(cacheId, key1, 0, 0, 0)
#define SearchSysCacheCopy2(cacheId, key1, key2) \
SearchSysCacheCopy(cacheId, key1, key2, 0, 0)
#define SearchSysCacheCopy3(cacheId, key1, key2, key3) \
SearchSysCacheCopy(cacheId, key1, key2, key3, 0)
#define SearchSysCacheCopy4(cacheId, key1, key2, key3, key4) \
SearchSysCacheCopy(cacheId, key1, key2, key3, key4)
#define SearchSysCacheExists1(cacheId, key1) \
SearchSysCacheExists(cacheId, key1, 0, 0, 0)
#define SearchSysCacheExists2(cacheId, key1, key2) \
SearchSysCacheExists(cacheId, key1, key2, 0, 0)
#define SearchSysCacheExists3(cacheId, key1, key2, key3) \
SearchSysCacheExists(cacheId, key1, key2, key3, 0)
#define SearchSysCacheExists4(cacheId, key1, key2, key3, key4) \
SearchSysCacheExists(cacheId, key1, key2, key3, key4)
#define GetSysCacheOid1(cacheId, key1) \
GetSysCacheOid(cacheId, key1, 0, 0, 0)
#define GetSysCacheOid2(cacheId, key1, key2) \
GetSysCacheOid(cacheId, key1, key2, 0, 0)
#define GetSysCacheOid3(cacheId, key1, key2, key3) \
GetSysCacheOid(cacheId, key1, key2, key3, 0)
#define GetSysCacheOid4(cacheId, key1, key2, key3, key4) \
GetSysCacheOid(cacheId, key1, key2, key3, key4)
#define SearchSysCacheList1(cacheId, key1) \
SearchSysCacheList(cacheId, 1, key1, 0, 0, 0)
#define SearchSysCacheList2(cacheId, key1, key2) \
SearchSysCacheList(cacheId, 2, key1, key2, 0, 0)
#define SearchSysCacheList3(cacheId, key1, key2, key3) \
SearchSysCacheList(cacheId, 3, key1, key2, key3, 0)
#define SearchSysCacheList4(cacheId, key1, key2, key3, key4) \
SearchSysCacheList(cacheId, 4, key1, key2, key3, key4)
#define ReleaseSysCacheList(x) ReleaseCatCacheList(x)
#endif /* SYSCACHE_H */