mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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83 lines
No EOL
2 KiB
C
83 lines
No EOL
2 KiB
C
/** Skip first hook.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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*********************************************************************************/
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/** @addtogroup hooks Hook functions
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* @{
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*/
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#include "hook.h"
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#include "plugin.h"
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#include "timing.h"
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static int hook_skip_first(struct hook *h, int when, struct hook_info *j)
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{
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struct {
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struct timespec skip; /**< Time to wait until first message is not skipped */
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struct timespec until; /**< Absolute point in time from where we accept samples. */
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} *private = hook_storage(h, when, sizeof(*private), NULL, NULL);
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char *endptr;
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double wait;
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switch (when) {
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case HOOK_PARSE:
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if (!h->parameter)
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error("Missing parameter for hook: '%s'", h->name);
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wait = strtof(h->parameter, &endptr);
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if (h->parameter == endptr)
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error("Invalid parameter '%s' for hook 'skip_first'", h->parameter);
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private->skip = time_from_double(wait);
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break;
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case HOOK_PATH_START:
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case HOOK_PATH_RESTART:
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private->until = time_add(&j->smps[0]->ts.received, &private->skip);
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break;
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case HOOK_READ:
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assert(j->smps);
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int i, ok;
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for (i = 0, ok = 0; i < j->cnt; i++) {
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if (time_delta(&private->until, &j->smps[i]->ts.received) > 0) {
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struct sample *tmp;
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tmp = j->smps[i];
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j->smps[i] = j->smps[ok];
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j->smps[ok++] = tmp;
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}
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/* To discard the first X samples in 'smps[]' we must
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* shift them to the end of the 'smps[]' array.
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* In case the hook returns a number 'ok' which is smaller than 'cnt',
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* only the first 'ok' samples in 'smps[]' are accepted and further processed.
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*/
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}
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return ok;
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}
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return 0;
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}
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static struct plugin p = {
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.name = "skip_first",
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.description = "Skip the first samples",
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.type = PLUGIN_TYPE_HOOK,
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.hook = {
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.priority = 99,
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.history = 0,
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.cb = hook_skip_first,
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.type = HOOK_STORAGE | HOOK_PARSE | HOOK_READ | HOOK_PATH
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}
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};
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REGISTER_PLUGIN(&p)
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/** @} */ |