-/* $Id: isamb.c,v 1.28 2004-05-30 18:04:49 adam Exp $
+/* $Id: isamb.c,v 1.30 2004-06-01 12:56:38 adam Exp $
Copyright (C) 1995,1996,1997,1998,1999,2000,2001,2002,2003,2004
Index Data Aps
/* maximum size of encoded buffer */
#define DST_ITEM_MAX 256
+#define ISAMB_MAX_LEVEL 10
/* approx 2*max page + max size of item */
#define DST_BUF_SIZE 16840
int cache; /* 0=no cache, 1=use cache, -1=dummy isam (for testing only) */
int log_io; /* log level for bf_read/bf_write calls */
int log_freelist; /* log level for freelist handling */
+ int skipped_numbers; /* on a leaf node */
+ int returned_numbers;
+ int skipped_nodes[ISAMB_MAX_LEVEL]; /* [0]=skipped leaves, 1=higher etc */
+ int accessed_nodes[ISAMB_MAX_LEVEL]; /* nodes we did not skip */
};
struct ISAMB_block {
ISAMB isamb;
ISAMB_P pos;
int level;
+ int maxlevel; /* total depth */
int total_size;
int no_blocks;
+ int skipped_numbers; /* on a leaf node */
+ int returned_numbers;
+ int skipped_nodes[ISAMB_MAX_LEVEL]; /* [0]=skipped leaves, 1=higher etc */
+ int accessed_nodes[ISAMB_MAX_LEVEL]; /* nodes we did not skip */
struct ISAMB_block **block;
};
isamb->log_io = 0;
isamb->log_freelist = 0;
isamb->cache = cache;
+ isamb->skipped_numbers=0;
+ isamb->returned_numbers=0;
+ for (i=0;i<ISAMB_MAX_LEVEL;i++)
+ isamb->skipped_nodes[i]= isamb->accessed_nodes[i]=0;
assert (cache == 0);
isamb->file = xmalloc (sizeof(*isamb->file) * isamb->no_cat);
void isamb_close (ISAMB isamb)
{
int i;
+ for (i=0;isamb->accessed_nodes[i];i++)
+ logf(LOG_DEBUG,"isamb_close level leaf-%d: %d read, %d skipped",
+ i, isamb->accessed_nodes[i], isamb->skipped_nodes[i]);
+ logf(LOG_DEBUG,"isamb_close returned %d values, skipped %d",
+ isamb->skipped_numbers, isamb->returned_numbers);
for (i = 0; i<isamb->no_cat; i++)
{
flush_blocks (isamb, i);
p->size = (p->buf[1] + 256 * p->buf[2]) - ISAMB_DATA_OFFSET;
if (p->size < 0)
{
- fprintf (stderr, "pos=%d\n", pos);
+ yaz_log (LOG_FATAL, "Bad block size %d in pos=%d\n", p->size, pos);
}
assert (p->size >= 0);
p->offset = 0;
p->dirty = 0;
p->deleted = 0;
p->decodeClientData = (*b->method->code_start)(ISAMC_DECODE);
+ yaz_log (LOG_DEBUG, "isamb_open_block: Opened block %d ofs=%d",pos, p->offset);
return p;
}
ISAMB_PP isamb_pp_open_x (ISAMB isamb, ISAMB_P pos, int *level)
{
ISAMB_PP pp = xmalloc (sizeof(*pp));
+ int i;
pp->isamb = isamb;
- pp->block = xmalloc (10 * sizeof(*pp->block));
+ pp->block = xmalloc (ISAMB_MAX_LEVEL * sizeof(*pp->block));
pp->pos = pos;
pp->level = 0;
+ pp->maxlevel=0;
pp->total_size = 0;
pp->no_blocks = 0;
+ pp->skipped_numbers=0;
+ pp->returned_numbers=0;
+ for (i=0;i<ISAMB_MAX_LEVEL;i++)
+ pp->skipped_nodes[i] = pp->accessed_nodes[i]=0;
while (1)
{
struct ISAMB_block *p = open_block (isamb, pos);
pp->total_size += p->size;
pp->no_blocks++;
-
if (p->leaf)
break;
+
decode_ptr (&src, &pos);
p->offset = src - p->bytes;
pp->level++;
+ pp->accessed_nodes[pp->level]++;
}
pp->block[pp->level+1] = 0;
+ pp->maxlevel=pp->level;
if (level)
*level = pp->level;
return pp;
int i;
if (!pp)
return;
+ logf(LOG_DEBUG,"isamb_pp_close lev=%d returned %d values, skipped %d",
+ pp->maxlevel, pp->skipped_numbers, pp->returned_numbers);
+ for (i=pp->maxlevel;i>=0;i--)
+ if ( pp->skipped_nodes[i] || pp->accessed_nodes[i])
+ logf(LOG_DEBUG,"isamb_pp_close level leaf-%d: %d read, %d skipped", i,
+ pp->accessed_nodes[i], pp->skipped_nodes[i]);
+ pp->isamb->skipped_numbers += pp->skipped_numbers;
+ pp->isamb->returned_numbers += pp->returned_numbers;
+ for (i=pp->maxlevel;i>=0;i--)
+ {
+ pp->isamb->accessed_nodes[i] += pp->accessed_nodes[i];
+ pp->isamb->skipped_nodes[i] += pp->skipped_nodes[i];
+ }
if (size)
*size = pp->total_size;
if (blocks)
isamb_pp_close_x (pp, 0, 0);
}
+
+#if 0
+/* Old isamb_pp_read that Adam wrote, kept as a reference in case we need to
+ debug the more complex pp_read that also forwards. May be deleted near end
+ of 2004, if it has not shown to be useful */
+
int isamb_pp_read (ISAMB_PP pp, void *buf)
{
char *dst = buf;
pp->block[pp->level] = 0;
(pp->level)--;
p = pp->block[pp->level];
- assert (!p->leaf); /* must be int */
+ assert (!p->leaf);
}
src = p->bytes + p->offset;
pp->total_size += p->size;
pp->no_blocks++;
- if (p->leaf) /* leaf */
+ if (p->leaf)
{
break;
}
(*pp->isamb->method->code_item)(ISAMC_DECODE, p->decodeClientData,
&dst, &src);
p->offset = src - (char*) p->bytes;
+ key_logdump_txt(LOG_DEBUG,buf, "isamb_pp_read returning 1");
return 1;
}
+#else
+int isamb_pp_read (ISAMB_PP pp, void *buf)
+{
+ return isamb_pp_forward(pp,buf,0);
+}
+#endif
+
+int isamb_pp_forward (ISAMB_PP pp, void *buf, const void *untilbuf)
+{
+ /* pseudocode:
+ * while 1
+ * while at end of node
+ * climb higher. If out, return 0
+ * while not on a leaf (and not at its end)
+ * decode next
+ * if cmp
+ * descend to node
+ * decode next
+ * if cmp
+ * return 1
+ */
+ /*
+ * The upper nodes consist of a sequence of nodenumbers and keys
+ * When opening a block, the first node number is read in, and
+ * offset points to the first key, which is the upper limit of keys
+ * in the node just read.
+ */
+ char *dst = buf;
+ char *src;
+ struct ISAMB_block *p = pp->block[pp->level];
+ int cmp;
+ int item_len;
+ int pos;
+ int nxtpos;
+ if (!p)
+ return 0;
+ logf(LOG_DEBUG,"isamb_pp_forward starting [%p] p=%d",pp,p->pos);
+
+ (*pp->isamb->method->log_item)(LOG_DEBUG, untilbuf, "until");
+ (*pp->isamb->method->log_item)(LOG_DEBUG, buf, "buf");
+
+ while (1)
+ {
+ while ( p->offset == p->size)
+ { /* end of this block - climb higher */
+ logf(LOG_DEBUG,"isamb_pp_forward climbing from l=%d",
+ pp->level);
+ if (pp->level == 0)
+ {
+ logf(LOG_DEBUG,"isamb_pp_forward returning 0 at root");
+ return 0; /* at end of the root, nothing left */
+ }
+ close_block(pp->isamb, pp->block[pp->level]);
+ pp->block[pp->level]=0;
+ (pp->level)--;
+ p=pp->block[pp->level];
+ logf(LOG_DEBUG,"isamb_pp_forward climbed to node %d off=%d",
+ p->pos, p->offset);
+ assert(!p->leaf);
+ /* skip the child we have handled */
+ if (p->offset != p->size)
+ {
+ src = p->bytes + p->offset;
+ decode_ptr(&src, &item_len);
+
+ (*pp->isamb->method->log_item)(LOG_DEBUG, src,
+ " isamb_pp_forward "
+ "climb skipping old key");
+ src += item_len;
+ decode_ptr(&src,&pos);
+ p->offset = src - (char*) p->bytes;
+ break; /* even if this puts us at the end of the block, we need to */
+ /* descend to the last pos. UGLY coding, clean up some */
+ /* day */
+ }
+ }
+ if (!p->leaf)
+ {
+ src = p->bytes + p->offset;
+ if (p->offset == p->size)
+ cmp=-2 ; /* descend to the last node, as we have no value to cmp */
+ else
+ {
+ decode_ptr(&src, &item_len);
+ logf(LOG_DEBUG,"isamb_pp_forward (B) on a high node. ofs=%d sz=%d nxtpos=%d ",
+ p->offset,p->size,pos);
+
+
+ (*pp->isamb->method->log_item)(LOG_DEBUG, src, "");
+ if (untilbuf)
+ cmp=(*pp->isamb->method->compare_item)(untilbuf,src);
+ else
+ cmp=-2;
+ src += item_len;
+ decode_ptr(&src,&nxtpos);
+ }
+ if (cmp<2)
+ {
+ logf(LOG_DEBUG,"isambb_pp_forward descending l=%d p=%d ",
+ pp->level, pos);
+ ++(pp->level);
+ p = open_block(pp->isamb,pos);
+ pp->block[pp->level] = p ;
+ pp->total_size += p->size;
+ (pp->accessed_nodes[pp->maxlevel - pp->level])++;
+ pp->no_blocks++;
+ if ( !p->leaf)
+ { /* block starts with a pos */
+ src = p->bytes + p->offset;
+ decode_ptr(&src,&pos);
+ p->offset=src-(char*) p->bytes;
+ logf(LOG_DEBUG,"isamb_pp_forward: block %d starts with %d",
+ p->pos, pos);
+ }
+ } /* descend to the node */
+ else
+ { /* skip the node */
+ p->offset = src - (char*) p->bytes;
+ pos=nxtpos;
+ (pp->skipped_nodes[pp->maxlevel - pp->level -1])++;
+ logf(LOG_DEBUG,
+ "isamb_pp_forward: skipping block on level %d, noting on %d (%d)",
+ pp->level, pp->maxlevel - pp->level-1 ,
+ pp->skipped_nodes[pp->maxlevel - pp->level-1 ]);
+ /* 0 is always leafs, 1 is one level above leafs etc, no
+ * matter how high tree */
+ }
+ } /* not on a leaf */
+ else
+ { /* on a leaf */
+ src = p->bytes + p->offset;
+ dst=buf;
+ (*pp->isamb->method->code_item)(ISAMC_DECODE, p->decodeClientData,
+ &dst, &src);
+ p->offset = src - (char*) p->bytes;
+ if (untilbuf)
+ cmp=(*pp->isamb->method->compare_item)(untilbuf,buf);
+ else
+ cmp=-2;
+ logf(LOG_DEBUG,"isamb_pp_forward on a leaf. cmp=%d",
+ cmp);
+ (*pp->isamb->method->log_item)(LOG_DEBUG, buf, "");
+
+ if (cmp <2)
+ {
+ if (untilbuf)
+ {
+ (*pp->isamb->method->log_item)(LOG_DEBUG, buf,
+ "isamb_pp_forward returning 1");
+ }
+ else
+ {
+ (*pp->isamb->method->log_item)(LOG_DEBUG, buf,
+ "isamb_pp_read returning 1 (fwd)");
+ }
+ pp->returned_numbers++;
+ return 1;
+ }
+ else
+ pp->skipped_numbers++;
+ } /* leaf */
+ } /* main loop */
+}
+
+
int isamb_pp_num (ISAMB_PP pp)
{
return 1;
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