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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2018-11-07 12:19:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2018-11-07 12:20:17 +0000 |
commit | a64a253794ac64cb40befee54db53bde17dd0d49 (patch) | |
tree | c1024acc5f6e508814b944d99f112259bb28b1be /web/api/queries/median/median.c | |
parent | New upstream version 1.10.0+dfsg (diff) | |
download | netdata-2dec20452b290c484d509f7ac9a29b38cf690223.tar.xz netdata-2dec20452b290c484d509f7ac9a29b38cf690223.zip |
New upstream version 1.11.0+dfsgupstream/1.11.0+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'web/api/queries/median/median.c')
-rw-r--r-- | web/api/queries/median/median.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/web/api/queries/median/median.c b/web/api/queries/median/median.c new file mode 100644 index 000000000..5a13b2e4d --- /dev/null +++ b/web/api/queries/median/median.c @@ -0,0 +1,79 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "median.h" + + +// ---------------------------------------------------------------------------- +// median + +struct grouping_median { + size_t series_size; + size_t next_pos; + + LONG_DOUBLE series[]; +}; + +void *grouping_create_median(RRDR *r) { + long entries = r->group; + if(entries < 0) entries = 0; + + struct grouping_median *g = (struct grouping_median *)callocz(1, sizeof(struct grouping_median) + entries * sizeof(LONG_DOUBLE)); + g->series_size = (size_t)entries; + + return g; +} + +// resets when switches dimensions +// so, clear everything to restart +void grouping_reset_median(RRDR *r) { + struct grouping_median *g = (struct grouping_median *)r->internal.grouping_data; + g->next_pos = 0; +} + +void grouping_free_median(RRDR *r) { + freez(r->internal.grouping_data); + r->internal.grouping_data = NULL; +} + +void grouping_add_median(RRDR *r, calculated_number value) { + struct grouping_median *g = (struct grouping_median *)r->internal.grouping_data; + + if(unlikely(g->next_pos >= g->series_size)) { + error("INTERNAL ERROR: median buffer overflow on chart '%s' - next_pos = %zu, series_size = %zu, r->group = %ld.", r->st->name, g->next_pos, g->series_size, r->group); + } + else { + if(isnormal(value)) + g->series[g->next_pos++] = (LONG_DOUBLE)value; + } +} + +calculated_number grouping_flush_median(RRDR *r, RRDR_VALUE_FLAGS *rrdr_value_options_ptr) { + struct grouping_median *g = (struct grouping_median *)r->internal.grouping_data; + + calculated_number value; + + if(unlikely(!g->next_pos)) { + value = 0.0; + *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY; + } + else { + if(g->next_pos > 1) { + sort_series(g->series, g->next_pos); + value = (calculated_number)median_on_sorted_series(g->series, g->next_pos); + } + else + value = (calculated_number)g->series[0]; + + if(!isnormal(value)) { + value = 0.0; + *rrdr_value_options_ptr |= RRDR_VALUE_EMPTY; + } + + //log_series_to_stderr(g->series, g->next_pos, value, "median"); + } + + g->next_pos = 0; + + return value; +} + |