add spamme example
This commit is contained in:
Michael Davidsaver
270
examples/spamme.cpp
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270
examples/spamme.cpp
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#include <deque>
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#include <set>
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#include <vector>
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#include <string>
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#include <exception>
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#if !defined(_WIN32)
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#include <signal.h>
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#define USE_SIGNAL
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#endif
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#include <epicsEvent.h>
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#include <epicsMutex.h>
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#include <epicsGuard.h>
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#include <pv/configuration.h>
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#include <pv/pvAccess.h>
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#include <pv/serverContext.h>
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namespace pvd = epics::pvData;
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namespace pva = epics::pvAccess;
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namespace {
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typedef epicsGuard<epicsMutex> Guard;
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epicsEvent done;
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#ifdef USE_SIGNAL
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void alldone(int num)
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{
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(void)num;
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done.signal();
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}
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#endif
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pvd::Structure::const_shared_pointer spamtype(pvd::getFieldCreate()->createFieldBuilder()
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->add("value", pvd::pvInt)
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->createStructure());
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struct SpamProvider;
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struct SpamChannel;
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struct SpamMonitor : public pva::Monitor,
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public std::tr1::enable_shared_from_this<SpamMonitor>
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{
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const std::tr1::shared_ptr<SpamChannel> channel;
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const pva::MonitorRequester::shared_pointer requester;
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epicsMutex mutex;
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bool running;
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std::deque<epics::pvData::MonitorElementPtr> filled, empty;
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pvd::PVStructure::shared_pointer value;
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epicsUInt32 counter;
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SpamMonitor(const std::tr1::shared_ptr<SpamChannel>& chan,
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const pva::MonitorRequester::shared_pointer &requester,
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const pvd::PVStructure::shared_pointer &pvRequest)
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:channel(chan)
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,requester(requester)
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,running(false)
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,counter(0)
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{
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pvd::int32 qsize = 0;
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pvd::PVScalar::shared_pointer queueSize(pvRequest->getSubField<pvd::PVScalar>("record._options.queueSize"));
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if(queueSize)
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qsize = queueSize->getAs<pvd::int32>();
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if(qsize<=0)
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qsize = 3;
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pvd::PVDataCreatePtr create(pvd::getPVDataCreate());
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value = create->createPVStructure(spamtype);
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for(pvd::int32 i=0; i<qsize; i++)
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{
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pvd::MonitorElementPtr elem(new pvd::MonitorElement(create->createPVStructure(spamtype)));
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empty.push_back(elem);
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}
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}
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virtual ~SpamMonitor() {}
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virtual void destroy() OVERRIDE FINAL {(void)stop();}
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virtual pvd::Status start() OVERRIDE FINAL
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{
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bool run;
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{
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Guard G(mutex);
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run = running;
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running = true;
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}
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if(!run)
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pushall();
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return pvd::Status::Ok;
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}
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virtual pvd::Status stop() OVERRIDE FINAL
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{
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{
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Guard G(mutex);
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running = false;
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}
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return pvd::Status::Ok;
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}
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virtual pva::MonitorElementPtr poll() OVERRIDE FINAL
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{
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Guard G(mutex);
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pva::MonitorElementPtr ret;
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if(!filled.empty()) {
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ret = filled.front();
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filled.pop_front();
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}
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return ret;
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}
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virtual void release(const pva::MonitorElementPtr& elem) OVERRIDE FINAL
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{
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if(elem->pvStructurePtr->getField().get()!=spamtype.get())
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return;
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{
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Guard G(mutex);
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empty.push_back(elem);
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}
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pushall();
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}
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void pushall()
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{
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bool signal = false;
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{
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Guard G(mutex);
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while(!empty.empty()) {
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pva::MonitorElementPtr elem(empty.front());
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pvd::PVIntPtr fld(value->getSubFieldT<pvd::PVInt>("value"));
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fld->put(counter++);
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elem->pvStructurePtr->copyUnchecked(*value);
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elem->changedBitSet->clear();
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elem->changedBitSet->set(0);
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elem->overrunBitSet->clear();
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signal |= filled.empty();
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filled.push_back(elem);
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empty.pop_front();
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}
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}
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if(signal)
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requester->monitorEvent(shared_from_this());
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}
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};
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struct SpamChannel : public pva::Channel,
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public std::tr1::enable_shared_from_this<SpamChannel>
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{
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const std::tr1::shared_ptr<pva::ChannelProvider> provider;
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const std::string name;
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const pva::ChannelRequester::shared_pointer requester;
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SpamChannel(const std::tr1::shared_ptr<pva::ChannelProvider>& provider,
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const std::string& name,
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const pva::ChannelRequester::shared_pointer& requester)
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:provider(provider)
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,name(name)
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,requester(requester)
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{}
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virtual ~SpamChannel() {}
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virtual std::string getChannelName() OVERRIDE FINAL {return name;}
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virtual std::string getRemoteAddress() OVERRIDE FINAL {return "";}
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virtual ConnectionState getConnectionState() OVERRIDE FINAL {return CONNECTED;}
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virtual std::tr1::shared_ptr<pva::ChannelRequester> getChannelRequester() OVERRIDE FINAL { return requester; }
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virtual void destroy() OVERRIDE FINAL {}
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virtual std::tr1::shared_ptr<pva::ChannelProvider> getProvider() OVERRIDE FINAL {return provider;}
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virtual pva::AccessRights getAccessRights(pvd::PVField::shared_pointer const & pvField) OVERRIDE FINAL
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{
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return pva::readWrite;
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}
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virtual void getField(pva::GetFieldRequester::shared_pointer const & requester,std::string const & subField) OVERRIDE FINAL
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{
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requester->getDone(pvd::Status::Ok, spamtype);
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}
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virtual pva::Monitor::shared_pointer createMonitor(const pva::MonitorRequester::shared_pointer &requester,
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const pvd::PVStructure::shared_pointer &pvRequest) OVERRIDE FINAL
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{
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pva::Monitor::shared_pointer ret(new SpamMonitor(shared_from_this(), requester, pvRequest));
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requester->monitorConnect(pvd::Status::Ok, ret, spamtype);
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return ret;
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}
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};
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struct SpamProvider : public pva::ChannelProvider,
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public pva::ChannelFind,
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public std::tr1::enable_shared_from_this<SpamProvider>
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{
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const std::string channelName;
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SpamProvider(const std::string& name) :channelName(name) {}
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virtual ~SpamProvider() {}
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virtual std::string getProviderName() OVERRIDE FINAL {return "SpamProvider";}
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virtual void destroy() OVERRIDE FINAL {}
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virtual pva::ChannelFind::shared_pointer channelFind(std::string const & name,
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pva::ChannelFindRequester::shared_pointer const & requester) OVERRIDE FINAL
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{
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std::cerr<<"XXX "<<name<<"\n";
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pva::ChannelFind::shared_pointer ret;
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if(name==this->channelName) {
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ret = shared_from_this();
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}
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std::cout<<__FUNCTION__<<" "<<name<<" found="<<!!ret<<"\n";
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requester->channelFindResult(pvd::Status::Ok, ret, !!ret);
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return ret;
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}
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virtual std::tr1::shared_ptr<pva::ChannelProvider> getChannelProvider() OVERRIDE FINAL { return shared_from_this(); }
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virtual void cancel() OVERRIDE FINAL {}
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virtual pva::Channel::shared_pointer createChannel(std::string const & name,
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pva::ChannelRequester::shared_pointer const & requester,
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short priority, std::string const & address) OVERRIDE FINAL
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{
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pva::Channel::shared_pointer ret;
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if(name==channelName) {
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ret.reset(new SpamChannel(shared_from_this(), channelName, requester));
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}
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std::cout<<__FUNCTION__<<" "<<name<<" connect "<<ret.get()<<"\n";
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requester->channelCreated(ret ? pvd::Status::Ok : pvd::Status::error(""), ret);
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return ret;
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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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try {
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pva::ChannelProvider::shared_pointer provider(new SpamProvider("spam"));
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pva::ServerContext::shared_pointer server(pva::ServerContext::create(pva::ServerContext::Config()
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.provider(provider)
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.config(pva::ConfigurationBuilder()
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.push_env()
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.build())));
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std::cout<<"Server use_count="<<server.use_count()<<" provider use_count="<<provider.use_count()<<"\n";
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#ifdef USE_SIGNAL
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signal(SIGINT, alldone);
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signal(SIGTERM, alldone);
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signal(SIGQUIT, alldone);
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#endif
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server->printInfo();
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std::cout<<"Waiting\n";
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done.wait();
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std::cout<<"Done\n";
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std::cout<<"Server use_count="<<server.use_count()<<" provider use_count="<<provider.use_count()<<"\n";
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server.reset();
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std::cout<<"provider use_count="<<provider.use_count()<<"\n";
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} catch(std::exception& e){
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std::cerr<<"Error: "<<e.what()<<"\n";
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return 1;
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}
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return 0;
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}
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