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/**
* @file
* @author 2012-2013 Stefan Radomski (stefan.radomski@cs.tu-darmstadt.de)
* @copyright Simplified BSD
*
* @cond
* This program is free software: you can redistribute it and/or modify
* it under the terms of the FreeBSD license as published by the FreeBSD
* project.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the FreeBSD license along with this
* program. If not, see <http://www.opensource.org/licenses/bsd-license>.
* @endcond
*/
#include "USCXMLInvoker.h"
#include "uscxml/util/DOM.h"
#ifdef BUILD_AS_PLUGINS
#include <Pluma/Connector.hpp>
#endif
#ifdef UNIX
#include <pthread.h>
#endif
namespace uscxml {
// msxml.h should die in a fire for polluting the global namespace
// using namespace XERCESC_NS;
#ifdef BUILD_AS_PLUGINS
PLUMA_CONNECTOR
bool pluginConnect(pluma::Host& host) {
host.add( new USCXMLInvokerProvider() );
return true;
}
#endif
USCXMLInvoker::USCXMLInvoker() {
_parentQueue = EventQueue(std::shared_ptr<ParentQueueImpl>(new ParentQueueImpl(this)));
_thread = NULL;
_isActive = false;
_isStarted = false;
}
USCXMLInvoker::~USCXMLInvoker() {
stop();
}
void USCXMLInvoker::start() {
_isStarted = true;
_thread = new std::thread(USCXMLInvoker::run, this);
}
void USCXMLInvoker::stop() {
_isStarted = false;
_isActive = false;
if (_thread) {
/**
* We cannot join the invoked thread if it is blocking at an external
* receive. Cancel will finalize and unblock.
*/
_invokedInterpreter.cancel();
_thread->join();
delete _thread;
_thread = NULL;
}
}
void USCXMLInvoker::deserialize(const Data& encodedState) {
_invokedInterpreter.deserialize(encodedState["intepreter"]);
}
Data USCXMLInvoker::serialize() {
Data encodedState;
std::lock_guard<std::recursive_mutex> lock(_mutex);
InterpreterState state = USCXML_UNDEF;
while((state = _invokedInterpreter.getState())) {
if (state != USCXML_IDLE && state != USCXML_MACROSTEPPED && state != USCXML_FINISHED) {
_cond.wait(_mutex);
} else {
break;
}
}
encodedState["intepreter"] = Data(_invokedInterpreter.serialize());
return encodedState;
}
void USCXMLInvoker::uninvoke() {
_isActive = false;
stop();
}
void USCXMLInvoker::eventFromSCXML(const Event& event) {
if (_isActive) {
_invokedInterpreter.receive(event);
}
}
void USCXMLInvoker::run(void* instance) {
USCXMLInvoker* INSTANCE = (USCXMLInvoker*)instance;
#ifdef APPLE
std::string threadName;
threadName += "uscxml::";
threadName += (INSTANCE->_invokedInterpreter.getImpl()->_name.size() > 0 ? INSTANCE->_invokedInterpreter.getImpl()->_name : "anon");
threadName += ".scxml";
pthread_setname_np(threadName.c_str());
#endif
InterpreterState state = USCXML_UNDEF;
while(state != USCXML_FINISHED) {
std::lock_guard<std::recursive_mutex> lock(INSTANCE->_mutex);
state = INSTANCE->_invokedInterpreter.step(200);
INSTANCE->_cond.notify_all();
}
if (INSTANCE->_isActive) {
// we finished on our own and were not cancelled
Event e;
e.eventType = Event::PLATFORM;
e.invokeid = INSTANCE->_invokedInterpreter.getImpl()->getInvokeId();
e.name = "done.invoke." + e.invokeid;
INSTANCE->_callbacks->enqueueExternal(e);
}
INSTANCE->_isActive = false;
}
std::shared_ptr<InvokerImpl> USCXMLInvoker::create(InvokerCallbacks* callbacks) {
std::shared_ptr<USCXMLInvoker> invoker(new USCXMLInvoker());
invoker->_callbacks = callbacks;
return invoker;
}
Data USCXMLInvoker::getDataModelVariables() {
Data data;
return data;
}
void USCXMLInvoker::invoke(const std::string& source, const Event& invokeEvent) {
if (source.length() > 0) {
_invokedInterpreter = Interpreter::fromURL(source);
} else if (invokeEvent.data.node) {
XERCESC_NS::DOMImplementation* implementation = XERCESC_NS::DOMImplementationRegistry::getDOMImplementation(X("core"));
XERCESC_NS::DOMDocument* document = implementation->createDocument();
// we need to import the parent - to support xpath test150
XERCESC_NS::DOMNode* newNode = document->importNode(invokeEvent.data.node, true);
document->appendChild(newNode);
// TODO: where do we get the namespace from?
_invokedInterpreter = Interpreter::fromDocument(document, _callbacks->getBaseURL(), false);
} else if (invokeEvent.data.atom.size() > 0) {
// test530 when deserializing
_invokedInterpreter = Interpreter::fromXML(invokeEvent.data.atom, _callbacks->getBaseURL());
} else {
_isActive = false;
ERROR_PLATFORM_THROW("Cannot invoke nested SCXML interpreter, neither src attribute nor content nor DOM is given");
}
if (_invokedInterpreter) {
_invokedInterpreter.getImpl()->_parentQueue = _parentQueue;
_invokedInterpreter.getImpl()->_invokeId = invokeEvent.invokeid;
// test240 assumes that invoke request params will carry over to the datamodel
_invokedInterpreter.getImpl()->_invokeReq = invokeEvent;
// create new instances from the parent's ActionLanguage
InterpreterImpl* invoked = _invokedInterpreter.getImpl().get();
ActionLanguage* alOrig = _callbacks->getActionLanguage();
if (alOrig != NULL) {
ActionLanguage al;
// create new instances
al.execContent = alOrig->execContent.getImpl()->create(invoked);
al.delayQueue = alOrig->delayQueue.getImplDelayed()->create(invoked);
al.internalQueue = alOrig->internalQueue.getImplBase()->create();
al.externalQueue = alOrig->externalQueue.getImplBase()->create();
al.microStepper = alOrig->microStepper.getImpl()->create(invoked);
_invokedInterpreter.setActionLanguage(al);
}
// TODO: setup invokers dom, check datamodel attribute and create new instance from parent if matching?
// copy monitors
std::set<InterpreterMonitor*> monitors = _callbacks->getMonitors();
for (auto monitor : monitors) {
if (monitor->copyToInvokers()) {
_invokedInterpreter.getImpl()->_monitors.insert(monitor);
}
}
_isActive = true;
// we need to make sure it is at least setup to receive data!
_invokedInterpreter.getImpl()->init();
start();
} else {
// test 530
// TODO: Is this the correct thing/place to do?
Event e("done.invoke." + invokeEvent.invokeid, Event::PLATFORM);
eventToSCXML(e, USCXML_INVOKER_SCXML_TYPE, _invokeId);
_isActive = false;
}
}
void USCXMLInvoker::ParentQueueImpl::enqueue(const Event& event) {
// test 252
if (!_invoker->_isActive)
return;
Event copy(event); // TODO: can we get around a copy?
_invoker->eventToSCXML(copy, USCXML_INVOKER_SCXML_TYPE, _invoker->_invokeId);
}
}
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