139 lines
3.8 KiB
C++
139 lines
3.8 KiB
C++
/**
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* pvAccessCPP 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 <algorithm>
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#define epicsExportSharedSymbols
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#include <pv/beaconEmitter.h>
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#include <pv/serializationHelper.h>
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#include <pv/logger.h>
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#include <pv/serverContextImpl.h>
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using namespace std;
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using namespace epics::pvData;
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namespace epics {
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namespace pvAccess {
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const float BeaconEmitter::EPICS_PVA_MIN_BEACON_PERIOD = 1.0;
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const float BeaconEmitter::EPICS_PVA_MIN_BEACON_COUNT_LIMIT = 3.0;
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//BeaconEmitter::BeaconEmitter(Transport::shared_pointer const & transport, ServerContextImpl::shared_pointer const & context) :
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BeaconEmitter::BeaconEmitter(std::string const & protocol,
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Transport::shared_pointer const & transport, std::tr1::shared_ptr<ServerContextImpl>& context) :
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_protocol(protocol),
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_transport(transport),
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_beaconSequenceID(0),
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_guid(context->getGUID()),
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_fastBeaconPeriod(std::max(context->getBeaconPeriod(), EPICS_PVA_MIN_BEACON_PERIOD)),
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_slowBeaconPeriod(std::max(180.0, _fastBeaconPeriod)), // TODO configurable
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_beaconCountLimit((int16)std::max(10.0f, EPICS_PVA_MIN_BEACON_COUNT_LIMIT)), // TODO configurable
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_serverAddress(*(context->getServerInetAddress())),
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_serverPort(context->getServerPort()),
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_serverStatusProvider(context->getBeaconServerStatusProvider()),
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_timer(context->getTimer())
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{
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}
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BeaconEmitter::~BeaconEmitter()
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{
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// shared_from_this is not yet allows in destructor
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// be sure to call destroy() first !!!
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// destroy();
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}
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void BeaconEmitter::send(ByteBuffer* buffer, TransportSendControl* control)
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{
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// get server status
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PVField::shared_pointer serverStatus;
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if(_serverStatusProvider.get())
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{
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try
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{
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serverStatus = _serverStatusProvider->getServerStatusData();
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}
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catch (...) {
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// we have to proctect internal code from external implementation...
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LOG(logLevelDebug, "BeaconServerStatusProvider implementation thrown an exception.");
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}
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}
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// send beacon
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control->startMessage((int8)CMD_BEACON, 12+2+2+16+2);
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buffer->put(_guid.value, 0, sizeof(_guid.value));
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// TODO qos/flags (e.g. multicast/unicast)
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buffer->putByte(0);
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buffer->putByte(_beaconSequenceID);
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// TODO for now fixed changeCount
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buffer->putShort(0);
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// NOTE: is it possible (very likely) that address is any local address ::ffff:0.0.0.0
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encodeAsIPv6Address(buffer, &_serverAddress);
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buffer->putShort((int16)_serverPort);
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SerializeHelper::serializeString(_protocol, buffer, control);
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if (serverStatus)
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{
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// introspection interface + data
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serverStatus->getField()->serialize(buffer, control);
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serverStatus->serialize(buffer, control);
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}
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else
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{
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SerializationHelper::serializeNullField(buffer, control);
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}
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control->flush(true);
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// increment beacon sequence ID
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_beaconSequenceID++;
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reschedule();
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}
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void BeaconEmitter::timerStopped()
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{
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//noop
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}
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void BeaconEmitter::destroy()
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{
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Timer::shared_pointer timer(_timer.lock());
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if(timer)
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timer->cancel(shared_from_this());
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}
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void BeaconEmitter::start()
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{
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Timer::shared_pointer timer(_timer.lock());
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if(timer)
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timer->scheduleAfterDelay(shared_from_this(), 0.0);
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}
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void BeaconEmitter::reschedule()
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{
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const double period = (_beaconSequenceID >= _beaconCountLimit) ? _slowBeaconPeriod : _fastBeaconPeriod;
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if (period > 0)
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{
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Timer::shared_pointer timer(_timer.lock());
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if(timer)
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timer->scheduleAfterDelay(shared_from_this(), period);
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}
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}
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void BeaconEmitter::callback()
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{
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_transport->enqueueSendRequest(shared_from_this());
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}
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}
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}
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