Michael Davidsaver
24f3478c98
Added "safety" of passing move-able reference is an illusion since no use_count()==1 test is done. Instead extra (shallow) copies were made for each subscriber. Instead. Pass const reference, redefine MonitorControlOp::post() to transfer ownership, and make only a single copy in SharedPV::post().
123 lines
3.2 KiB
C++
123 lines
3.2 KiB
C++
/**
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* pvxs is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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*/
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#include <iostream>
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#include <epicsTime.h>
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#include <pvxs/source.h>
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#include <pvxs/server.h>
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#include <pvxs/nt.h>
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#include <pvxs/log.h>
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using namespace pvxs;
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DEFINE_LOGGER(app, "spam");
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namespace {
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struct SpamSource : public server::Source
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{
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std::shared_ptr<std::set<std::string>> names;
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Value initial;
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SpamSource()
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:names(std::make_shared<decltype (names)::element_type>())
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,initial(nt::NTScalar{TypeCode::UInt32}.create())
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{}
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// Source interface
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public:
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virtual void onSearch(Search &op) override final
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{
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for(auto& pv :op) {
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if(names->find(pv.name())!=names->end())
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pv.claim();
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}
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}
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virtual void onCreate(std::unique_ptr<server::ChannelControl> &&chan) override final
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{
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chan->onOp([this](std::unique_ptr<server::ConnectOp>&& cop) {
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cop->onGet([](std::unique_ptr<server::ExecOp>&& op) {
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op->error("Only monitor implemented");
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});
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cop->connect(initial);
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});
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chan->onSubscribe([this](std::unique_ptr<server::MonitorSetupOp>&& setup) {
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std::shared_ptr<server::MonitorControlOp> sub(setup->connect(initial));
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auto counter = std::make_shared<uint32_t>(0u);
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auto fill = [this, sub, counter]() mutable {
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Value update;
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do {
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auto cnt = (*counter)++;
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update = initial.cloneEmpty();
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update["value"] = cnt;
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log_debug_printf(app, "%s count %u\n", sub->peerName().c_str(), unsigned(cnt));
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}while(sub->tryPost(update));
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};
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sub->onHighMark(fill);
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sub->onStart([fill](bool start) mutable {
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if(start)
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fill();
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});
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log_info_printf(app, "%s Subscribing\n", setup->peerName().c_str());
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});
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}
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virtual List onList() override final
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{
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return List{names, false};
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}
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};
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} // namespace
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int main(int argc, char* argv[])
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{
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if(argc<=1) {
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std::cerr<<"Usage: "<<argv[0]<<" <pvname>\n";
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return 1;
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}
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// Read $PVXS_LOG from process environment and update
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// logging configuration. eg.
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// export PVXS_LOG=*=DEBUG
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// makes a lot of noise.
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logger_level_set(app.name, Level::Info);
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logger_config_env();
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auto src = std::make_shared<SpamSource>();
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src->names->insert(argv[1]);
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// Build server which will server this PV
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// Configure using process environment.
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server::Server serv = server::Config::fromEnv()
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.build()
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.addSource("spamsrc", src);
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// (optional) Print the configuration this server is using
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// with any auto-address list expanded.
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std::cout<<"Effective config\n"<<serv.config();
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std::cout<<"Running\n";
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// Start server and run forever, or until Ctrl+c is pressed.
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// Returns on SIGINT or SIGTERM
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serv.run();
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std::cout<<"Done\n";
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return 0;
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}
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