int sx_get(sx *x, sxindex *index, sv *key, sv *result)
{
sxmanager *m = x->manager;
ssrbnode *n = NULL;
int rc;
rc = sx_match(&index->i, index->r->scheme,
sv_pointer(key),
sv_size(key),
&n);
if (! (rc == 0 && n))
goto add;
sxv *head = sscast(n, sxv, node);
sxv *v = sx_vmatch(head, x->id);
if (v == NULL)
goto add;
if (ssunlikely((v->v->flags & SVGET) > 0))
return 0;
if (ssunlikely((v->v->flags & SVDELETE) > 0))
return 2;
sv vv;
sv_init(&vv, &sv_vif, v->v, NULL);
svv *ret = sv_vdup(m->r, &vv);
if (ssunlikely(ret == NULL)) {
rc = sr_oom(m->r->e);
} else {
sv_init(result, &sv_vif, ret, NULL);
rc = 1;
}
return rc;
add:
/* track a start of the latest read sequence in the
* transactional log */
if (x->log_read == -1)
x->log_read = sv_logcount(&x->log);
rc = sx_set(x, index, key->v);
if (ssunlikely(rc == -1))
return -1;
sv_vref((svv*)key->v);
return 0;
}
int sx_get(sx *x, sxindex *index, svv *key, svv **result)
{
ssrbnode *n = NULL;
int rc;
rc = sx_match(&index->i, index->r->scheme,
sv_vpointer(key), 0, &n);
if (! (rc == 0 && n))
goto add;
sxv *head = sscast(n, sxv, node);
sxv *v = sx_vmatch(head, x->id);
if (v == NULL)
goto add;
if (ssunlikely(sv_vflags(v->v, index->r) & SVGET))
return 0;
if (ssunlikely(sv_vflags(v->v, index->r) & SVDELETE))
return 2;
*result = sv_vbuildraw(index->r, sv_vpointer(v->v));
if (ssunlikely(*result == NULL)) {
sr_oom(index->r->e);
rc = -1;
} else {
rc = 1;
}
return rc;
add:
/* track a start of the latest read sequence in the
* transactional log */
if (x->log_read == -1)
x->log_read = sv_logcount(x->log);
rc = sx_set(x, index, key);
if (ssunlikely(rc == -1))
return -1;
sv_vref(key);
return 0;
}
so *se_read(sedb *db, sedocument *o, sx *x, uint64_t vlsn,
sicache *cache)
{
se *e = se_of(&db->o);
uint64_t start = ss_utime();
/* prepare the key */
int auto_close = o->created <= 1;
int rc = se_document_createkey(o);
if (ssunlikely(rc == -1))
goto error;
rc = se_document_validate_ro(o, &db->o);
if (ssunlikely(rc == -1))
goto error;
if (ssunlikely(! se_active(e)))
goto error;
sv vup;
sv_init(&vup, &sv_vif, NULL, NULL);
sedocument *ret = NULL;
/* concurrent */
if (x && o->order == SS_EQ) {
/* note: prefix is ignored during concurrent
* index search */
int rc = sx_get(x, &db->coindex, &o->v, &vup);
if (ssunlikely(rc == -1 || rc == 2 /* delete */))
goto error;
if (rc == 1 && !sv_is(&vup, SVUPSERT)) {
ret = (sedocument*)se_document_new(e, &db->o, &vup);
if (sslikely(ret)) {
ret->cold_only = o->cold_only;
ret->created = 1;
ret->orderset = 1;
ret->flagset = 1;
} else {
sv_vunref(db->r, vup.v);
}
if (auto_close)
so_destroy(&o->o);
return &ret->o;
}
} else {
sx_get_autocommit(&e->xm, &db->coindex);
}
/* prepare read cache */
int cachegc = 0;
if (cache == NULL) {
cachegc = 1;
cache = si_cachepool_pop(&e->cachepool);
if (ssunlikely(cache == NULL)) {
if (vup.v)
sv_vunref(db->r, vup.v);
sr_oom(&e->error);
goto error;
}
}
sv_vref(o->v.v);
/* do read */
siread rq;
si_readopen(&rq, db->index, cache, o->order,
vlsn,
sv_pointer(&o->v),
vup.v,
o->prefix_copy,
o->prefix_size,
o->cold_only,
0,
start);
rc = si_read(&rq);
si_readclose(&rq);
/* prepare result */
if (rc == 1) {
ret = (sedocument*)se_readresult(e, &rq);
if (ret)
o->prefix_copy = NULL;
}
/* cleanup */
if (o->v.v)
sv_vunref(db->r, o->v.v);
if (vup.v)
sv_vunref(db->r, vup.v);
if (ret == NULL && rq.result.v)
sv_vunref(db->r, rq.result.v);
if (cachegc && cache)
si_cachepool_push(cache);
if (auto_close)
so_destroy(&o->o);
return &ret->o;
error:
if (auto_close)
so_destroy(&o->o);
return NULL;
}
