mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-23 00:00:01 +01:00
95 lines
2.4 KiB
C++
95 lines
2.4 KiB
C++
/** Node type: Universal Data-exchange API
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*
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* @author Steffen Vogel <svogel2@eonerc.rwth-aachen.de>
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* @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#include <vector>
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#include <villas/exceptions.hpp>
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#include <villas/nodes/api.hpp>
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using namespace villas;
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using namespace villas::node;
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APINode::APINode(const std::string &name) :
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Node(name),
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read(),
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write()
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{
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int ret;
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auto dirs = std::vector{&read, &write};
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for (auto dir : dirs) {
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ret = pthread_mutex_init(&dir->mutex, nullptr);
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if (ret)
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throw RuntimeError("failed to initialize mutex");
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ret = pthread_cond_init(&dir->cv, nullptr);
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if (ret)
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throw RuntimeError("failed to initialize mutex");
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}
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}
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int APINode::prepare()
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{
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auto signals_in = getInputSignals(false);
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read.sample = sample_alloc_mem(signals_in->size());
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if (!read.sample)
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throw MemoryAllocationError();
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write.sample = sample_alloc_mem(64);
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if (!write.sample)
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throw MemoryAllocationError();
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unsigned j = 0;
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for (auto sig : *signals_in)
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read.sample->data[j++] = sig->init;
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read.sample->length = j;
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read.sample->signals = signals_in;
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return Node::prepare();
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}
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int APINode::_read(struct Sample *smps[], unsigned cnt)
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{
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assert(cnt == 1);
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pthread_cond_wait(&read.cv, &read.mutex);
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sample_copy(smps[0], read.sample);
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return 1;
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}
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int APINode::_write(struct Sample *smps[], unsigned cnt)
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{
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assert(cnt == 1);
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sample_copy(write.sample, smps[0]);
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pthread_cond_signal(&write.cv);
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return 1;
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}
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static char n[] = "api";
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static char d[] = "A node providing a HTTP REST interface";
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static NodePlugin<APINode, n , d, (int) NodeFactory::Flags::SUPPORTS_READ | (int) NodeFactory::Flags::SUPPORTS_WRITE, 1> p;
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