int Ardb::ZClear(const DBID& db, const Slice& key)
{
KeyLockerGuard keyguard(m_key_locker, db, key);
ZSetMetaValue meta;
if (0 != GetZSetMetaValue(db, key, meta))
{
return 0;
}
Slice empty;
ZSetKeyObject sk(key, empty, meta.min_score, db);
BatchWriteGuard guard(GetEngine());
struct ZClearWalk: public WalkHandler
{
Ardb* z_db;
int OnKeyValue(KeyObject* k, ValueObject* value, uint32 cursor)
{
ZSetKeyObject* sek = (ZSetKeyObject*) k;
ZSetScoreKeyObject tmp(sek->key, sek->value, sek->db);
z_db->DelValue(*sek);
z_db->DelValue(tmp);
return 0;
}
ZClearWalk(Ardb* db) :
z_db(db)
{
}
} walk(this);
Walk(sk, false, &walk);
KeyObject k(key, ZSET_META, db);
DelValue(k);
return 0;
}
int Ardb::FlushScripts()
{
KeyObject start(Slice(), SCRIPT, ARDB_GLOBAL_DB);
Iterator* iter = FindValue(start, false);
BatchWriteGuard guard(GetEngine());
while (NULL != iter && iter->Valid())
{
Slice tmpkey = iter->Key();
KeyObject* kk = decode_key(tmpkey, NULL);
if (NULL != kk)
{
if (kk->type == SCRIPT)
{
DelValue(*kk);
} else
{
break;
}
}
DELETE(kk);
iter->Next();
}
DELETE(iter);
return 0;
}
int Ardb::ZRem(const DBID& db, const Slice& key, const Slice& value)
{
KeyLockerGuard keyguard(m_key_locker, db, key);
ZSetScoreKeyObject zk(key, value, db);
ValueObject zv;
if (0 == GetValue(zk, &zv))
{
BatchWriteGuard guard(GetEngine());
DelValue(zk);
ZSetKeyObject zsk(key, value, zv.v.double_v, db);
DelValue(zsk);
ZSetMetaValue meta;
if (0 == GetZSetMetaValue(db, key, meta))
{
meta.size--;
SetZSetMetaValue(db, key, meta);
}
return 0;
}
return ERR_NOT_EXIST;
}
/*
* returns -1:no change 0:no meta&zset size change
* 1:meta change & no zset size change
* 2:meta change & zset size change
*/
int Ardb::TryZAdd(const DBID& db, const Slice& key, ZSetMetaValue& meta,
double score, const Slice& value)
{
bool metachange = false;
if (score > meta.max_score)
{
meta.max_score = score;
metachange = true;
}
if (score < meta.min_score)
{
meta.min_score = score;
metachange = true;
}
ZSetScoreKeyObject zk(key, value, db);
ValueObject zv;
if (0 != GetValue(zk, &zv))
{
meta.size++;
zv.type = DOUBLE;
zv.v.double_v = score;
SetValue(zk, zv);
ZSetKeyObject zsk(key, value, score, db);
ValueObject zsv;
zsv.type = EMPTY;
SetValue(zsk, zsv);
return 2;
} else
{
if (zv.v.double_v != score)
{
ZSetKeyObject zsk(key, value, zv.v.double_v, db);
DelValue(zsk);
zsk.score = score;
ValueObject zsv;
zsv.type = EMPTY;
SetValue(zsk, zsv);
zv.type = DOUBLE;
zv.v.double_v = score;
SetValue(zk, zv);
return metachange ? 1 : 0;
}
}
return -1;
}
int Ardb::ZIncrby(const DBID& db, const Slice& key, double increment,
const Slice& value, double& score)
{
KeyLockerGuard keyguard(m_key_locker, db, key);
ZSetScoreKeyObject zk(key, value, db);
ValueObject zv;
if (0 == GetValue(zk, &zv))
{
BatchWriteGuard guard(GetEngine());
SetValue(zk, zv);
ZSetKeyObject zsk(key, value, zv.v.double_v, db);
DelValue(zsk);
zsk.score += increment;
ValueObject zsv;
zsv.type = EMPTY;
SetValue(zsk, zsv);
score = zsk.score;
return 0;
}
return ERR_NOT_EXIST;
}