/**/
-#include <obstack.h>
#include <glpk.h>
#include "rscommon.h"
static CommodInfo *commodstable;
static sqlite3_stmt *ss_ipair_dist, *ss_ipair_trades;
+static sqlite3_stmt *ss_ite_buy, *ss_ite_sell;
#define MAX_LEGS (MAX_ROUTELEN-1)
typedef struct IslandTradeEnd {
struct IslandTradeEnd *next;
int commodid, price;
- int qty, rownum;
+ int qty;
+ unsigned long generation;
+ int rownum;
} IslandTradeEnd, *IslandDirnTradeEnds;
typedef struct {
IslandDirnTradeEnds collect, deliver;
} IslandTradeEnds;
-static struct obstack ites_obstack;
static LPX *lp;
+static unsigned long generation;
static int nconstraint_rows;
static int constraint_rows[1+2+3*MAX_LEGS];
constraint_coeffs[nconstraint_rows]= coefficient;
}
-static void avail_constraint(const Trade *t, IslandDirnTradeEnds *trades,
- int price, int qty, const char *srcdst) {
+static void avail_c(const Trade *t, IslandDirnTradeEnds *trades,
+ int price, const char *srcdst,
+ int islandid, sqlite3_stmt *ss_ite) {
/* find row number of trade availability constraint */
IslandTradeEnd *search;
for (search= *trades; search; search=search->next)
- if (search->commodid==t->commodid && search->price==price) {
- assert(search->qty == qty);
+ if (search->commodid==t->commodid && search->price==price)
goto found;
- }
/* not found, add new row */
- search= obstack_alloc(&ites_obstack, sizeof(*search));
+
+ search= mmalloc(sizeof(*search));
search->commodid= t->commodid;
search->price= price;
- search->qty= qty;
- search->rownum= lpx_add_rows(lp, 1);
search->next= *trades;
- if (DEBUGP(value)) {
- char *name= masprintf("%s_commod%d_price%d",srcdst,t->commodid,price);
- lpx_set_row_name(lp,search->rownum,name);
- free(name);
- }
+ search->generation= 0;
+
+ SQL_MUST( sqlite3_bind_int(ss_ite, 1, islandid) );
+ SQL_MUST( sqlite3_bind_int(ss_ite, 2, t->commodid) );
+ SQL_MUST( sqlite3_bind_int(ss_ite, 3, price) );
+ assert(SQL_STEP(ss_ite));
+ search->qty= sqlite3_column_int(ss_ite, 0);
+ SQL_MUST( sqlite3_reset(ss_ite) );
+
*trades= search;
+
found:;
- int rownum= search->rownum;
+ if (search->generation != generation) {
+ search->rownum= lpx_add_rows(lp, 1);
+ lpx_set_row_bnds(lp, search->rownum, LPX_UP, 0, search->qty);
+
+ if (DEBUGP(value)) {
+ char *name= masprintf("%s_commod%d_price%d",srcdst,t->commodid,price);
+ lpx_set_row_name(lp,search->rownum,name);
+ free(name);
+ }
+ search->generation= generation;
+ }
- lpx_set_row_bnds(lp, rownum, LPX_UP, 0, qty);
- add_constraint(rownum, 1.0);
+ add_constraint(search->rownum, 1.0);
}
static int setup_leg_constraints(double max_thing, int legs, const char *wh) {
*/
assert(nislands >= 1);
-
- char *free_to_reset_obstack= obstack_alloc(&ites_obstack, 1);
+ assert(++generation);
int nites=0;
IslandTradeEnds ites[nislands], *iteps[nislands];
nconstraint_rows=0;
- avail_constraint(t, &iteps[s]->collect, t->src_price,t->src_qty,"src");
- avail_constraint(t, &iteps[d]->deliver, t->dst_price,t->dst_qty,"dst");
+ avail_c(t, &iteps[s]->collect, t->src_price,"src", si, ss_ite_sell);
+ avail_c(t, &iteps[d]->deliver, t->dst_price,"dst", di, ss_ite_buy);
int leg;
for (leg=s; leg<d; leg++) {
lpx_delete_prob(lp);
lp= 0;
-
- obstack_free(&ites_obstack, free_to_reset_obstack);
}
void setup_value(void) {
sqlite3_stmt *sst;
int i;
-#define obstack_chunk_alloc mmalloc
-#define obstack_chunk_free free
- obstack_init(&ites_obstack);
-
nislands= sql_single_int("SELECT max(islandid) FROM islands") + 1;
debugf("VALUE nislands=%d\n",nislands);
sqlite3_finalize(sst);
SQL_MUST( sqlite3_prepare(db,
- "SELECT\n"
+ " SELECT dist from dists where aiid=? and biid=?",
+ -1, &ss_ipair_dist, 0) );
+
+ SQL_MUST( sqlite3_prepare(db,
+ "SELECT DISTINCT\n"
" sell.commodid commodid,\n"
" sell.price src_price,\n"
- " sum(sell.qty) src_qty,\n"
- " buy.price dst_price,\n"
- " sum(buy.qty) dst_qty\n"
+ " buy.price dst_price\n"
" FROM sell JOIN buy\n"
" ON sell.commodid = buy.commodid\n"
" AND buy.price > sell.price\n"
" WHERE sell.islandid=?\n"
- " AND buy.islandid=?\n"
- " GROUP BY sell.commodid, sell.price, buy.price",
+ " AND buy.islandid=?",
-1, &ss_ipair_trades, 0) );
- SQL_MUST( sqlite3_prepare(db,
- " SELECT dist from dists where aiid=? and biid=?",
- -1, &ss_ipair_dist, 0) );
+#define BS(bs) \
+ SQL_MUST( sqlite3_prepare(db, \
+ "SELECT\n" \
+ " sum(qty)\n" \
+ " FROM " #bs "\n" \
+ " WHERE islandid=?\n" \
+ " AND commodid=?\n" \
+ " AND price=?", \
+ -1, &ss_ite_##bs, 0) );
+ BS(buy)
+ BS(sell)
+#undef BS
ipairs= mcalloc(sizeof(*ipairs) * nislands);
}