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/*-------------------------------------------------------------------------
*
* pgxc_class.c
* routines to support manipulation of the pgxc_class relation
*
* Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 2010-2012 Postgres-XC Development Group
*
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/heapam.h"
#include "access/htup_details.h"
#include "catalog/dependency.h"
#include "catalog/indexing.h"
#include "catalog/namespace.h"
#include "catalog/pg_type.h"
#include "catalog/pgxc_class.h"
#include "utils/builtins.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#include "pgxc/locator.h"
#include "utils/array.h"
/*
* PgxcClassCreate
* Create a pgxc_class entry
*/
void
PgxcClassCreate(Oid pcrelid,
char pclocatortype,
int pcattnum,
int pchashalgorithm,
int pchashbuckets,
int numnodes,
Oid *nodes)
{
Relation pgxcclassrel;
HeapTuple htup;
bool nulls[Natts_pgxc_class];
Datum values[Natts_pgxc_class];
int i;
oidvector *nodes_array;
/* Build array of Oids to be inserted */
nodes_array = buildoidvector(nodes, numnodes);
/* Iterate through attributes initializing nulls and values */
for (i = 0; i < Natts_pgxc_class; i++)
{
nulls[i] = false;
values[i] = (Datum) 0;
}
/* should not happen */
if (pcrelid == InvalidOid)
{
elog(ERROR,"pgxc class relid invalid.");
return;
}
values[Anum_pgxc_class_pcrelid - 1] = ObjectIdGetDatum(pcrelid);
values[Anum_pgxc_class_pclocatortype - 1] = CharGetDatum(pclocatortype);
if (pclocatortype == LOCATOR_TYPE_HASH || pclocatortype == LOCATOR_TYPE_MODULO)
{
values[Anum_pgxc_class_pcattnum - 1] = UInt16GetDatum(pcattnum);
values[Anum_pgxc_class_pchashalgorithm - 1] = UInt16GetDatum(pchashalgorithm);
values[Anum_pgxc_class_pchashbuckets - 1] = UInt16GetDatum(pchashbuckets);
}
/* Node information */
values[Anum_pgxc_class_nodes - 1] = PointerGetDatum(nodes_array);
/* Open the relation for insertion */
pgxcclassrel = heap_open(PgxcClassRelationId, RowExclusiveLock);
htup = heap_form_tuple(pgxcclassrel->rd_att, values, nulls);
CatalogTupleInsert(pgxcclassrel, htup);
heap_close(pgxcclassrel, RowExclusiveLock);
}
/*
* PgxcClassAlter
* Modify a pgxc_class entry with given data
*/
void
PgxcClassAlter(Oid pcrelid,
char pclocatortype,
int pcattnum,
int pchashalgorithm,
int pchashbuckets,
int numnodes,
Oid *nodes,
PgxcClassAlterType type)
{
Relation rel;
HeapTuple oldtup, newtup;
oidvector *nodes_array;
Datum new_record[Natts_pgxc_class];
bool new_record_nulls[Natts_pgxc_class];
bool new_record_repl[Natts_pgxc_class];
Assert(OidIsValid(pcrelid));
rel = heap_open(PgxcClassRelationId, RowExclusiveLock);
oldtup = SearchSysCacheCopy1(PGXCCLASSRELID,
ObjectIdGetDatum(pcrelid));
if (!HeapTupleIsValid(oldtup)) /* should not happen */
elog(ERROR, "cache lookup failed for pgxc_class %u", pcrelid);
/* Build array of Oids to be inserted */
nodes_array = buildoidvector(nodes, numnodes);
/* Initialize fields */
MemSet(new_record, 0, sizeof(new_record));
MemSet(new_record_nulls, false, sizeof(new_record_nulls));
MemSet(new_record_repl, false, sizeof(new_record_repl));
/* Fields are updated depending on operation type */
switch (type)
{
case PGXC_CLASS_ALTER_DISTRIBUTION:
new_record_repl[Anum_pgxc_class_pclocatortype - 1] = true;
new_record_repl[Anum_pgxc_class_pcattnum - 1] = true;
new_record_repl[Anum_pgxc_class_pchashalgorithm - 1] = true;
new_record_repl[Anum_pgxc_class_pchashbuckets - 1] = true;
break;
case PGXC_CLASS_ALTER_NODES:
new_record_repl[Anum_pgxc_class_nodes - 1] = true;
break;
case PGXC_CLASS_ALTER_ALL:
default:
new_record_repl[Anum_pgxc_class_pcrelid - 1] = true;
new_record_repl[Anum_pgxc_class_pclocatortype - 1] = true;
new_record_repl[Anum_pgxc_class_pcattnum - 1] = true;
new_record_repl[Anum_pgxc_class_pchashalgorithm - 1] = true;
new_record_repl[Anum_pgxc_class_pchashbuckets - 1] = true;
new_record_repl[Anum_pgxc_class_nodes - 1] = true;
}
/* Set up new fields */
/* Relation Oid */
if (new_record_repl[Anum_pgxc_class_pcrelid - 1])
new_record[Anum_pgxc_class_pcrelid - 1] = ObjectIdGetDatum(pcrelid);
/* Locator type */
if (new_record_repl[Anum_pgxc_class_pclocatortype - 1])
new_record[Anum_pgxc_class_pclocatortype - 1] = CharGetDatum(pclocatortype);
/* Attribute number of distribution column */
if (new_record_repl[Anum_pgxc_class_pcattnum - 1])
new_record[Anum_pgxc_class_pcattnum - 1] = UInt16GetDatum(pcattnum);
/* Hash algorithm type */
if (new_record_repl[Anum_pgxc_class_pchashalgorithm - 1])
new_record[Anum_pgxc_class_pchashalgorithm - 1] = UInt16GetDatum(pchashalgorithm);
/* Hash buckets */
if (new_record_repl[Anum_pgxc_class_pchashbuckets - 1])
new_record[Anum_pgxc_class_pchashbuckets - 1] = UInt16GetDatum(pchashbuckets);
/* Node information */
if (new_record_repl[Anum_pgxc_class_nodes - 1])
new_record[Anum_pgxc_class_nodes - 1] = PointerGetDatum(nodes_array);
/* Update relation */
newtup = heap_modify_tuple(oldtup, RelationGetDescr(rel),
new_record,
new_record_nulls, new_record_repl);
CatalogTupleUpdate(rel, &oldtup->t_self, newtup);
heap_close(rel, RowExclusiveLock);
}
/*
* RemovePGXCClass():
* Remove extended PGXC information
*/
void
RemovePgxcClass(Oid pcrelid)
{
Relation relation;
HeapTuple tup;
/*
* Delete the pgxc_class tuple.
*/
relation = heap_open(PgxcClassRelationId, RowExclusiveLock);
tup = SearchSysCache(PGXCCLASSRELID,
ObjectIdGetDatum(pcrelid),
0, 0, 0);
if (!HeapTupleIsValid(tup)) /* should not happen */
elog(ERROR, "cache lookup failed for pgxc_class %u", pcrelid);
simple_heap_delete(relation, &tup->t_self);
ReleaseSysCache(tup);
heap_close(relation, RowExclusiveLock);
}
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