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VILLASnode/lib/hooks/average.cpp
Steffen Vogel 7eec1bb753 update Steffens mail address
Signed-off-by: Steffen Vogel <post@steffenvogel.de>
2022-12-16 23:44:07 +01:00

107 lines
2.3 KiB
C++

/** Average hook.
*
* @author Steffen Vogel <post@steffenvogel.de>
* @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
* @license Apache 2.0
*********************************************************************************/
#include <bitset>
#include <cstring>
#include <villas/hook.hpp>
#include <villas/node/exceptions.hpp>
#include <villas/signal.hpp>
#include <villas/sample.hpp>
namespace villas {
namespace node {
class AverageHook : public MultiSignalHook {
protected:
unsigned offset;
public:
AverageHook(Path *p, Node *n, int fl, int prio, bool en = true) :
MultiSignalHook(p, n, fl, prio, en),
offset(0)
{ }
virtual void prepare()
{
assert(state == State::CHECKED);
MultiSignalHook::prepare();
/* Add averaged signal */
auto avg_sig = std::make_shared<Signal>("average", "", SignalType::FLOAT);
if (!avg_sig)
throw RuntimeError("Failed to create new signal");
signals->insert(signals->begin() + offset, avg_sig);
state = State::PREPARED;
}
virtual void parse(json_t *json)
{
int ret;
json_error_t err;
assert(state != State::STARTED);
MultiSignalHook::parse(json);
ret = json_unpack_ex(json, &err, 0, "{ s: i }",
"offset", &offset
);
if (ret)
throw ConfigError(json, err, "node-config-hook-average");
state = State::PARSED;
}
virtual Hook::Reason process(struct Sample *smp)
{
double avg, sum = 0;
int n = 0;
assert(state == State::STARTED);
for (unsigned index : signalIndices) {
switch (sample_format(smp, index)) {
case SignalType::INTEGER:
sum += smp->data[index].i;
break;
case SignalType::FLOAT:
sum += smp->data[index].f;
break;
case SignalType::INVALID:
case SignalType::COMPLEX:
case SignalType::BOOLEAN:
return Hook::Reason::ERROR; /* not supported */
}
n++;
}
avg = sum / n;
if (offset >= smp->length)
return Reason::ERROR;
sample_data_insert(smp, (union SignalData *) &avg, offset, 1);
return Reason::OK;
}
};
/* Register hook */
static char n[] = "average";
static char d[] = "Calculate average over some signals";
static HookPlugin<AverageHook, n , d, (int) Hook::Flags::PATH | (int) Hook::Flags::NODE_READ | (int) Hook::Flags::NODE_WRITE> p;
} /* namespace node */
} /* namespace villas */