Viewing file:  incremental_sum.c (1.71 KB) -rw-r--r--
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// SPDX-License-Identifier: GPL-3.0-or-later
#include "incremental_sum.h"
// ----------------------------------------------------------------------------
// incremental sum
struct grouping_incremental_sum {
calculated_number first;
calculated_number last;
size_t count;
};
void *grouping_create_incremental_sum(RRDR *r) {
(void)r;
return callocz(1, sizeof(struct grouping_incremental_sum));
}
// resets when switches dimensions
// so, clear everything to restart
void grouping_reset_incremental_sum(RRDR *r) {
struct grouping_incremental_sum *g = (struct grouping_incremental_sum *)r->internal.grouping_data;
g->first = 0;
g->last = 0;
g->count = 0;
}
void grouping_free_incremental_sum(RRDR *r) {
freez(r->internal.grouping_data);
r->internal.grouping_data = NULL;
}
void grouping_add_incremental_sum(RRDR *r, calculated_number value) {
if(!isnan(value)) {
struct grouping_incremental_sum *g = (struct grouping_incremental_sum *)r->internal.grouping_data;
if(unlikely(!g->count)) {
g->first = value;
g->count++;
}
else {
g->last = value;
g->count++;
}
}
}
calculated_number grouping_flush_incremental_sum(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) {
struct grouping_incremental_sum *g = (struct grouping_incremental_sum *)r->internal.grouping_data;
calculated_number value;
if(unlikely(!g->count)) {
value = 0.0;
*rrdr_value_options_ptr |= RRDR_VALUE_EMPTY;
}
else if(unlikely(g->count == 1)) {
value = 0.0;
}
else {
value = g->last - g->first;
}
g->first = 0.0;
g->last = 0.0;
g->count = 0;
return value;
}
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