-/* $Id: rsmultiandor.c,v 1.19 2005-05-24 11:35:43 adam Exp $
- Copyright (C) 1995-2005
- Index Data ApS
-
-This file is part of the Zebra server.
+/* This file is part of the Zebra server.
+ Copyright (C) 1994-2011 Index Data
Zebra is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
for more details.
You should have received a copy of the GNU General Public License
-along with Zebra; see the file LICENSE.zebra. If not, write to the
-Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA.
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
*/
-/*
- * This module implements the rsmulti_or and rsmulti_and result sets
+/**
+ * \file rsmultiandor.c
+ * \brief This module implements the rsmulti_or and rsmulti_and result sets
*
* rsmultior is based on a heap, from which we find the next hit.
*
*/
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
const void *untilbuf);
static int r_forward_or(RSFD rfd, void *buf, TERMID *term,
const void *untilbuf);
-static void r_pos (RSFD rfd, double *current, double *total);
+static void r_pos_and(RSFD rfd, double *current, double *total);
+static void r_pos_or(RSFD rfd, double *current, double *total);
static void r_get_terms(RSET ct, TERMID *terms, int maxterms, int *curterm);
-static const struct rset_control control_or =
+static const struct rset_control control_or =
{
"multi-or",
r_delete,
r_open_or,
r_close,
r_forward_or,
- r_pos,
+ r_pos_or,
r_read_or,
r_write,
};
-static const struct rset_control control_and =
+static const struct rset_control control_and =
{
"multi-and",
r_delete,
r_open_and,
r_close,
r_forward_and,
- r_pos,
+ r_pos_and,
r_read_and,
r_write,
};
-/* The heap structure:
- * The rset contains a list or rsets we are ORing together
+/* The heap structure:
+ * The rset contains a list or rsets we are ORing together
* The rfd contains a heap of heap-items, which contain
* a rfd opened to those rsets, and a buffer for one key.
- * They also contain a ptr to the rset list in the rset
- * itself, for practical reasons.
+ * They also contain a ptr to the rset list in the rset
+ * itself, for practical reasons.
*/
struct heap_item {
zint hits; /* returned so far */
int eof; /* seen the end of it */
int tailcount; /* how many items are tailing */
+ zint segment;
+ int skip;
char *tailbits;
};
if (i>h->heapnum)
return;
(void)rset_pos(h->heap[i]->rset,h->heap[i]->fd, &cur, &tot);
- yaz_log(log_level," %d %*s i=%p buf=%p %0.1f/%0.1f",i, level, "",
+ yaz_log(log_level," %d %*s i=%p buf=%p %0.1f/%0.1f",i, level, "",
&(h->heap[i]), h->heap[i]->buf, cur,tot );
heap_dump_item(h, 2*i, level+1);
heap_dump_item(h, 2*i+1, level+1);
return ( 0==h->heapnum );
}
+/** \brief deletes the first item in the heap, and balances the rest
+ */
static void heap_delete (HEAP h)
-{ /* deletes the first item in the heap, and balances the rest */
+{
int cur = 1, child = 2;
h->heap[1] = 0; /* been deleted */
heap_swap (h, 1, h->heapnum--);
}
}
+/** \brief puts item into heap.
+ The heap root element has changed value (to bigger)
+ Swap downwards until the heap is ordered again
+*/
static void heap_balance (HEAP h)
-{ /* The heap root element has changed value (to bigger) */
- /* swap downwards until the heap is ordered again */
+{
int cur = 1, child = 2;
while (child <= h->heapnum) {
if (child < h->heapnum && heap_cmp(h,child,1+child)>0 )
/* nothing to delete, all is nmem'd, and will go away in due time */
}
+/** \brief compare and items for quicksort
+ used in qsort to get the multi-and args in optimal order
+ that is, those with fewest occurrences first
+*/
int compare_ands(const void *x, const void *y)
-{ /* used in qsort to get the multi-and args in optimal order */
- /* that is, those with fewest occurrences first */
- const struct heap_item *hx = x;
+{ const struct heap_item *hx = x;
const struct heap_item *hy = y;
double cur, totx, toty;
rset_pos(hx->fd, &cur, &totx);
return 0; /* return totx - toty, except for overflows and rounding */
}
-/* Creating and deleting rsets ***********************/
-
static RSET rsmulti_andor_create(NMEM nmem,
- struct rset_key_control *kcontrol,
+ struct rset_key_control *kcontrol,
int scope, TERMID termid,
- int no_rsets, RSET* rsets,
+ int no_rsets, RSET* rsets,
const struct rset_control *ctrl)
{
RSET rnew = rset_create_base(ctrl, nmem, kcontrol, scope, termid,
return rnew;
}
-RSET rsmulti_or_create(NMEM nmem, struct rset_key_control *kcontrol,
- int scope, TERMID termid, int no_rsets, RSET* rsets)
+RSET rset_create_or(NMEM nmem, struct rset_key_control *kcontrol,
+ int scope, TERMID termid, int no_rsets, RSET* rsets)
{
return rsmulti_andor_create(nmem, kcontrol, scope, termid,
no_rsets, rsets, &control_or);
}
-RSET rsmulti_and_create(NMEM nmem, struct rset_key_control *kcontrol,
- int scope, int no_rsets, RSET* rsets)
+RSET rset_create_and(NMEM nmem, struct rset_key_control *kcontrol,
+ int scope, int no_rsets, RSET* rsets)
{
return rsmulti_andor_create(nmem, kcontrol, scope, 0,
no_rsets, rsets, &control_and);
{
}
-/* Opening and closing fd's on them *********************/
-
static RSFD r_open_andor (RSET ct, int flag, int is_and)
{
RSFD rfd;
assert(p->items);
/* all other pointers shouls already be allocated, in right sizes! */
}
- else {
+ else
+ {
p = (struct rfd_private *) nmem_malloc (ct->nmem,sizeof(*p));
rfd->priv = p;
p->h = 0;
p->tailbits = 0;
if (is_and)
p->tailbits = nmem_malloc(ct->nmem, ct->no_children*sizeof(char) );
- else
+ else
p->h = heap_create( ct->nmem, ct->no_children, kctrl);
- p->items = (struct heap_item *)
+ p->items = (struct heap_item *)
nmem_malloc(ct->nmem, ct->no_children*sizeof(*p->items));
for (i = 0; i<ct->no_children; i++)
{
p->tailbits[i] = 0;
}
qsort(p->items, ct->no_children, sizeof(p->items[0]), compare_ands);
- } else
+ }
+ else
{ /* fill the heap for ORing */
for (i = 0; i<ct->no_children; i++){
p->items[i].fd = rset_open(ct->children[i],RSETF_READ);
if (p->h)
heap_destroy (p->h);
- for (i = 0; i<rfd->rset->no_children; i++)
+ for (i = 0; i<rfd->rset->no_children; i++)
if (p->items[i].fd)
rset_close(p->items[i].fd);
}
-
-
-static int r_forward_or(RSFD rfd, void *buf,
+static int r_forward_or(RSFD rfd, void *buf,
TERMID *term, const void *untilbuf)
{ /* while heap head behind untilbuf, forward it and rebalance heap */
struct rfd_private *p = rfd->priv;
if (rset_forward(p->h->heap[1]->fd,p->h->heap[1]->buf,
&p->h->heap[1]->term, untilbuf))
heap_balance(p->h);
- else
+ else
{
heap_delete(p->h);
if (heap_empty(p->h))
}
+/** \brief reads one item key from an 'or' set
+ \param rfd set handle
+ \param buf resulting item buffer
+ \param term resulting term
+ \retval 0 EOF
+ \retval 1 item could be read
+*/
static int r_read_or (RSFD rfd, void *buf, TERMID *term)
{
RSET rset = rfd->rset;
*term = rset->term;
else
*term = it->term;
- assert(*term);
}
(mrfd->hits)++;
rdres = rset_read(it->fd, it->buf, &it->term);
}
+/** \brief reads one item key from an 'and' set
+ \param rfd set handle
+ \param buf resulting item buffer
+ \param term resulting term
+ \retval 0 EOF
+ \retval 1 item could be read
+
+ Has to return all hits where each item points to the
+ same sysno (scope), in order. Keep an extra key (hitkey)
+ as long as all records do not point to hitkey, forward
+ them, and update hitkey to be the highest seen so far.
+ (if any item eof's, mark eof, and return 0 thereafter)
+ Once a hit has been found, scan all items for the smallest
+ value. Mark all as being in the tail. Read next from that
+ item, and if not in the same record, clear its tail bit
+*/
static int r_read_and (RSFD rfd, void *buf, TERMID *term)
-{ /* Has to return all hits where each item points to the */
- /* same sysno (scope), in order. Keep an extra key (hitkey) */
- /* as long as all records do not point to hitkey, forward */
- /* them, and update hitkey to be the highest seen so far. */
- /* (if any item eof's, mark eof, and return 0 thereafter) */
- /* Once a hit has been found, scan all items for the smallest */
- /* value. Mark all as being in the tail. Read next from that */
- /* item, and if not in the same record, clear its tail bit */
- struct rfd_private *p = rfd->priv;
+{ struct rfd_private *p = rfd->priv;
RSET ct = rfd->rset;
const struct rset_key_control *kctrl = ct->keycontrol;
- int i, mintail;
- int cmp;
+ int i;
while (1) {
- if (p->tailcount)
+ if (p->tailcount)
{ /* we are tailing, find lowest tail and return it */
- mintail = 0;
- while ((mintail<ct->no_children) && !p->tailbits[mintail])
- mintail++; /* first tail */
- for (i = mintail+1; i<ct->no_children; i++)
+ int mintail = -1;
+ int cmp;
+
+ for (i = 0; i<ct->no_children; i++)
{
if (p->tailbits[i])
{
- cmp=(*kctrl->cmp)(p->items[i].buf,p->items[mintail].buf);
- if (cmp<0)
+ if (mintail >= 0)
+ cmp = (*kctrl->cmp)
+ (p->items[i].buf, p->items[mintail].buf);
+ else
+ cmp = -1;
+ if (cmp < 0)
mintail = i;
+
+ if (kctrl->get_segment)
+ { /* segments enabled */
+ zint segment = kctrl->get_segment(p->items[i].buf);
+ /* store segment if not stored already */
+ if (!p->segment && segment)
+ p->segment = segment;
+
+ /* skip rest entirely if segments don't match */
+ if (p->segment && segment && p->segment != segment)
+ p->skip = 1;
+ }
}
}
/* return the lowest tail */
- memcpy(buf, p->items[mintail].buf, kctrl->key_size);
+ memcpy(buf, p->items[mintail].buf, kctrl->key_size);
if (term)
*term = p->items[mintail].term;
if (!rset_read(p->items[mintail].fd, p->items[mintail].buf,
&p->items[mintail].term))
{
p->eof = 1; /* game over, once tails have been returned */
- p->tailbits[mintail] = 0;
- (p->tailcount)--;
- (p->hits)++;
- return 1;
- }
- /* still a tail? */
- cmp = (*kctrl->cmp)(p->items[mintail].buf,buf);
- if (cmp >= rfd->rset->scope){
p->tailbits[mintail] = 0;
(p->tailcount)--;
}
- (p->hits)++;
+ else
+ {
+ /* still a tail? */
+ cmp = (*kctrl->cmp)(p->items[mintail].buf,buf);
+ if (cmp >= rfd->rset->scope)
+ {
+ p->tailbits[mintail] = 0;
+ (p->tailcount)--;
+ }
+ }
+ if (p->skip)
+ continue; /* skip again.. eventually tailcount will be 0 */
+ if (p->tailcount == 0)
+ (p->hits)++;
return 1;
- }
- /* not tailing, forward until all reocrds match, and set up */
+ }
+ /* not tailing, forward until all records match, and set up */
/* as tails. the earlier 'if' will then return the hits */
if (p->eof)
return 0; /* nothing more to see */
i = 1; /* assume items[0] is highest up */
- while (i<ct->no_children) {
- cmp = (*kctrl->cmp)(p->items[0].buf, p->items[i].buf);
+ while (i < ct->no_children)
+ {
+ int cmp = (*kctrl->cmp)(p->items[0].buf, p->items[i].buf);
if (cmp <= -rfd->rset->scope) { /* [0] was behind, forward it */
- if (!rset_forward(p->items[0].fd, p->items[0].buf,
+ if (!rset_forward(p->items[0].fd, p->items[0].buf,
&p->items[0].term, p->items[i].buf))
{
p->eof = 1; /* game over */
return 0;
}
- i = 0; /* start frowarding from scratch */
- } else if (cmp>=rfd->rset->scope)
+ i = 0; /* start forwarding from scratch */
+ }
+ else if (cmp>=rfd->rset->scope)
{ /* [0] was ahead, forward i */
- if (!rset_forward(p->items[i].fd, p->items[i].buf,
+ if (!rset_forward(p->items[i].fd, p->items[i].buf,
&p->items[i].term, p->items[0].buf))
{
p->eof = 1; /* game over */
return 0;
}
- } else
+ }
+ else
i++;
} /* while i */
/* if we get this far, all rsets are now within +- scope of [0] */
/* ergo, we have a hit. Mark them all as tailing, and let the */
/* upper 'if' return the hits in right order */
- for (i = 0; i<ct->no_children; i++)
+ for (i = 0; i < ct->no_children; i++)
p->tailbits[i] = 1;
p->tailcount = ct->no_children;
+ p->segment = 0;
+ p->skip = 0;
} /* while 1 */
}
-static int r_forward_and(RSFD rfd, void *buf, TERMID *term,
+static int r_forward_and(RSFD rfd, void *buf, TERMID *term,
const void *untilbuf)
-{
+{
struct rfd_private *p = rfd->priv;
RSET ct = rfd->rset;
const struct rset_key_control *kctrl = ct->keycontrol;
if (cmp <= -rfd->rset->scope)
{
killtail = 1; /* we are moving to a different hit */
- if (!rset_forward(p->items[i].fd, p->items[i].buf,
+ if (!rset_forward(p->items[i].fd, p->items[i].buf,
&p->items[i].term, untilbuf))
{
p->eof = 1; /* game over */
}
}
}
- if (killtail)
+ if (killtail)
{
for (i = 0; i<ct->no_children; i++)
p->tailbits[i] = 0;
return r_read_and(rfd,buf,term);
}
-static void r_pos (RSFD rfd, double *current, double *total)
+static void r_pos_x(RSFD rfd, double *current, double *total, int and_op)
{
RSET ct = rfd->rset;
- struct rfd_private *mrfd =
+ struct rfd_private *mrfd =
(struct rfd_private *)(rfd->priv);
- double cur, tot;
- double scur = 0.0, stot = 0.0;
+ double ratio = and_op ? 0.0 : 1.0;
int i;
+ double sum_cur = 0.0;
+ double sum_tot = 0.0;
for (i = 0; i<ct->no_children; i++){
+ double cur, tot;
rset_pos(mrfd->items[i].fd, &cur, &tot);
- yaz_log(log_level, "r_pos: %d %0.1f %0.1f", i, cur,tot);
- scur += cur;
- stot += tot;
+ yaz_log(log_level, "r_pos: %d %0.1f %0.1f", i, cur,tot);
+ if (and_op)
+ {
+ if (tot > 0.0)
+ {
+ double nratio = cur / tot;
+ if (nratio > ratio)
+ ratio = nratio;
+ }
+ }
+ else
+ {
+ if (cur > 0)
+ sum_cur += (cur - 1);
+ sum_tot += tot;
+ }
}
- if (stot < 1.0) { /* nothing there */
+ if (!and_op && sum_tot > 0.0)
+ ratio = sum_cur / sum_tot;
+ if (ratio == 0.0 || ratio == 1.0) { /* nothing there */
*current = 0;
*total = 0;
yaz_log(log_level, "r_pos: NULL %0.1f %0.1f", *current, *total);
else
{
*current = (double) (mrfd->hits);
- *total = *current*stot/scur;
+ *total = *current / ratio;
yaz_log(log_level, "r_pos: = %0.1f %0.1f", *current, *total);
}
}
+static void r_pos_and(RSFD rfd, double *current, double *total)
+{
+ r_pos_x(rfd, current, total, 1);
+}
+
+static void r_pos_or(RSFD rfd, double *current, double *total)
+{
+ r_pos_x(rfd, current, total, 0);
+}
+
static int r_write (RSFD rfd, const void *buf)
{
yaz_log (YLOG_FATAL, "multior set type is read-only");
rset_get_one_term(ct, terms, maxterms, curterm);
else
{
- /* Special case: Some multi-ors have all terms pointing to the same
+ /* Special case: Some multi-ors have all terms pointing to the same
term. We do not want to duplicate those. Other multiors (and ands)
- have different terms under them. Those we want.
+ have different terms under them. Those we want.
*/
int firstterm= *curterm;
int i;
rset_getterms(ct->children[i], terms, maxterms, curterm);
if ( ( *curterm > firstterm+1 ) &&
( *curterm <= maxterms ) &&
- ( terms[(*curterm)-1] == terms[firstterm] )
+ ( terms[(*curterm)-1] == terms[firstterm] )
)
(*curterm)--; /* forget the term, seen that before */
}
}
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * c-file-style: "Stroustrup"
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+
projects / idzebra-moved-to-github.git / blobdiff