static void display_reduce_exprs( struct deltadb *db, time_t current )
{
struct list_node *n;
/* Reset all reductions. */
for(n=db->reduce_exprs->head;n;n=n->next) {
deltadb_reduction_reset(n->data);
}
/* For each item in the hash table: */
char *key;
struct jx *jobject;
hash_table_firstkey(db->table);
while(hash_table_nextkey(db->table,&key,(void**)&jobject)) {
/* Skip if the where expression doesn't match */
if(!deltadb_boolean_expr(db->where_expr,jobject)) continue;
/* Update each reduction with its value. */
for(n=db->reduce_exprs->head;n;n=n->next) {
struct deltadb_reduction *r = n->data;
struct jx *value = jx_eval(r->expr,jobject);
if(value && !jx_istype(value, JX_ERROR)) {
if(value->type==JX_INTEGER) {
deltadb_reduction_update(n->data,(double)value->u.integer_value);
} else if(value->type==JX_DOUBLE) {
deltadb_reduction_update(n->data,value->u.double_value);
} else {
// treat non-numerics as 1, to facilitate operations like COUNT
deltadb_reduction_update(n->data,1);
}
jx_delete(value);
}
}
}
/* Emit the current time */
if(db->epoch_mode) {
printf("%lld\t",(long long) current);
} else {
char str[32];
strftime(str,sizeof(str),"%F %T",localtime(¤t));
printf("%s\t",str);
}
/* For each reduction, display the final value. */
for(n=db->reduce_exprs->head;n;n=n->next) {
printf("%lf\t",deltadb_reduction_value(n->data));
}
printf("\n");
}
void emit_all_deltadb_reductions( struct deltadb *db, time_t current, int first_output )
{
int i;
struct nvpair *nv;
char *key;
const char *value;
/* Reset all deltadb_reduction state. */
for(i=0;i<db->ndeltadb_reductions;i++) {
deltadb_reduction_reset(db->deltadb_reductions[i]);
}
/* After each event, iterate over all objects... */
hash_table_firstkey(db->table);
while(hash_table_nextkey(db->table,&key,(void**)&nv)) {
/* Update all deltadb_reductions for that object. */
for(i=0;i<db->ndeltadb_reductions;i++) {
struct deltadb_reduction *r = db->deltadb_reductions[i];
value = nvpair_lookup_string(nv,r->attr);
if(value) deltadb_reduction_update(r,value);
}
}
if(first_output) {
/* The first time we do this, make it a checkpoint record. */
printf("T %ld\n",(long)current);
printf("C 0\n");
for(i=0;i<db->ndeltadb_reductions;i++) {
struct deltadb_reduction *r = db->deltadb_reductions[i];
deltadb_reduction_print(r);
}
printf("\n");
//printf(".Checkpoint End.\n");
first_output = 0;
} else {
/* After that, make it an update record. */
printf("T %ld\n",(long)current);
for(i=0;i<db->ndeltadb_reductions;i++) {
struct deltadb_reduction *r = db->deltadb_reductions[i];
printf("U 0 ");
deltadb_reduction_print(r);
}
}
}
