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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 "uscxml/Common.h"
#include "uscxml/util/UUID.h"
#include "uscxml/Interpreter.h"
#include "uscxml/messages/Event.h"
#include "uscxml/util/String.h"
#include "uscxml/util/Predicates.h"
#include "easylogging++.h"
#include <iostream>
#include <assert.h>
#include <algorithm>
#include <memory>
#include <mutex>
#include "uscxml/interpreter/MicroStepFast.h"
#define VERBOSE 0
namespace uscxml {
using namespace xercesc;
std::map<std::string, std::weak_ptr<InterpreterImpl> > InterpreterImpl::_instances;
std::recursive_mutex InterpreterImpl::_instanceMutex;
std::map<std::string, std::weak_ptr<InterpreterImpl> > InterpreterImpl::getInstances() {
std::lock_guard<std::recursive_mutex> lock(_instanceMutex);
std::map<std::string, std::weak_ptr<InterpreterImpl> >::iterator instIter = _instances.begin();
while(instIter != _instances.end()) {
if (!instIter->second.lock()) {
_instances.erase(instIter++);
} else {
instIter++;
}
}
return _instances;
}
void InterpreterImpl::addInstance(std::shared_ptr<InterpreterImpl> interpreterImpl) {
std::lock_guard<std::recursive_mutex> lock(_instanceMutex);
assert(_instances.find(interpreterImpl->getSessionId()) == _instances.end());
_instances[interpreterImpl->getSessionId()] = interpreterImpl;
}
InterpreterImpl::InterpreterImpl() : _isInitialized(false), _document(NULL), _scxml(NULL), _state(USCXML_INSTANTIATED), _monitor(NULL) {
try {
xercesc::XMLPlatformUtils::Initialize();
} catch (const xercesc::XMLException& toCatch) {
ERROR_PLATFORM_THROW("Cannot initialize XercesC: " + X(toCatch.getMessage()).str());
}
_sessionId = UUID::getUUID();
_factory = Factory::getInstance();
}
InterpreterImpl::~InterpreterImpl() {
if (_delayQueue)
_delayQueue.cancelAllDelayed();
if (_document)
delete _document;
{
std::lock_guard<std::recursive_mutex> lock(_instanceMutex);
_instances.erase(getSessionId());
}
}
void InterpreterImpl::cancel() {
_microStepper.markAsCancelled();
Event unblock;
enqueueExternal(unblock);
}
void InterpreterImpl::setupDOM() {
if (!_document) {
ERROR_PLATFORM_THROW("Interpreter has no XML document");
}
if (!_scxml) {
// find scxml element
DOMNodeList* scxmls = NULL;
// proper namespace
scxmls = _document->getElementsByTagNameNS(X("http://www.w3.org/2005/07/scxml"), X("scxml"));
if (scxmls->getLength() > 0)
goto SCXML_STOP_SEARCH;
// no namespace
scxmls = _document->getElementsByTagName(X("scxml"));
if (scxmls->getLength() > 0)
goto SCXML_STOP_SEARCH;
SCXML_STOP_SEARCH:
if (scxmls->getLength() == 0) {
ERROR_PLATFORM_THROW("Cannot find SCXML element in DOM");
return;
}
_scxml = dynamic_cast<DOMElement*>(scxmls->item(0));
_xmlPrefix = _scxml->getPrefix();
_xmlNS = _scxml->getNamespaceURI();
if (_xmlPrefix) {
_xmlPrefix = std::string(_xmlPrefix) + ":";
}
if (HAS_ATTR(_scxml, "name")) {
_name = ATTR(_scxml, "name");
} else {
_name = _baseURL.pathComponents().back();
}
_binding = (HAS_ATTR(_scxml, "binding") && iequals(ATTR(_scxml, "binding"), "late") ? LATE : EARLY);
}
}
void InterpreterImpl::init() {
if (_isInitialized)
return;
setupDOM();
// register io processors
std::map<std::string, IOProcessorImpl*> ioProcs = _factory->getIOProcessors();
for (auto ioProcIter = ioProcs.begin(); ioProcIter != ioProcs.end(); ioProcIter++) {
// do not override if already set
if (_ioProcs.find(ioProcIter->first) != _ioProcs.end()) {
ioProcIter++;
continue;
}
// this might throw error.execution
_ioProcs[ioProcIter->first] = _factory->createIOProcessor(ioProcIter->first, this);
// register aliases
std::list<std::string> names = _ioProcs[ioProcIter->first].getNames();
for (auto nameIter = names.begin(); nameIter != names.end(); nameIter++) {
// do not override
if (!iequals(*nameIter, ioProcIter->first) && _ioProcs.find(*nameIter) == _ioProcs.end()) {
_ioProcs[*nameIter] = _ioProcs[ioProcIter->first];
}
}
}
if (!_microStepper) {
_microStepper = MicroStep(std::shared_ptr<MicroStepImpl>(new MicroStepFast(this)));
}
_microStepper.init(_scxml);
if (!_dataModel) {
_dataModel = _factory->createDataModel(HAS_ATTR(_scxml, "datamodel") ? ATTR(_scxml, "datamodel") : "null", this);
}
if (!_execContent) {
_execContent = ContentExecutor(std::shared_ptr<ContentExecutorImpl>(new BasicContentExecutorImpl(this)));
}
if (!_externalQueue) {
_externalQueue = EventQueue(std::shared_ptr<EventQueueImpl>(new EventQueueImpl()));
}
if (!_internalQueue) {
_internalQueue = EventQueue(std::shared_ptr<EventQueueImpl>(new EventQueueImpl()));
}
if (!_delayQueue) {
_delayQueue = DelayedEventQueue(std::shared_ptr<DelayedEventQueueImpl>(new DelayedEventQueueImpl(this)));
}
_isInitialized = true;
}
void InterpreterImpl::initData(xercesc::DOMElement* root) {
std::string id = ATTR(root, "id");
Data d;
try {
if (Event::getParam(_invokeReq.params, id, d)) {
_dataModel.init(id, d);
} else if (_invokeReq.namelist.find(id) != _invokeReq.namelist.end()) {
_dataModel.init(id, _invokeReq.namelist[id]);
} else {
_dataModel.init(id, _execContent.elementAsData(root));
}
} catch(ErrorEvent e) {
// test 277
enqueueInternal(e);
}
}
void InterpreterImpl::assign(const std::string& location, const Data& data) {
_dataModel.assign(location, data);
}
bool InterpreterImpl::isMatched(const Event& event, const std::string& eventDesc) {
return nameMatch(eventDesc, event.name);
}
bool InterpreterImpl::isTrue(const std::string& expr) {
try {
return _dataModel.evalAsBool(expr);
} catch (ErrorEvent e) {
// test 244: deliver error execution
LOG(ERROR) << e;
// test 344
enqueueInternal(e);
// test 245: undefined is false
return false;
}
}
bool InterpreterImpl::checkValidSendType(const std::string& type, const std::string& target) {
// this is the responsibility of the calling method
assert(type.size() > 0);
if (_ioProcs.find(type) == _ioProcs.end()) {
ERROR_EXECUTION_THROW("Type '" + type + "' not supported for sending");
}
if (!_ioProcs[type].isValidTarget(target)) {
ERROR_COMMUNICATION_THROW("Target '" + target + "' not supported in send");
}
return true;
}
Event InterpreterImpl::dequeueExternal(bool blocking) {
_currEvent = _externalQueue.dequeue(blocking);
if (_currEvent) {
_dataModel.setEvent(_currEvent);
// LOG(ERROR) << e.name;
// test 233
if (_currEvent.invokeid.size() > 0 &&
_invokers.find(_currEvent.invokeid) != _invokers.end() &&
_invokers[_currEvent.invokeid].getFinalize() != NULL) {
_execContent.process(_invokers[_currEvent.invokeid].getFinalize(), _xmlPrefix);
}
for (auto invIter = _invokers.begin(); invIter != _invokers.end(); invIter++) {
// test 229
if (_autoForwarders.find(invIter->first) != _autoForwarders.end()) {
invIter->second.eventFromSCXML(_currEvent);
}
}
}
return _currEvent;
}
void InterpreterImpl::enqueue(const std::string& type, const std::string& target, size_t delayMs, const Event& sendEvent) {
std::lock_guard<std::recursive_mutex> lock(_delayMutex);
assert(sendEvent.uuid.length() > 0);
assert(_delayedEventTargets.find(sendEvent.uuid) == _delayedEventTargets.end());
_delayedEventTargets[sendEvent.uuid] = std::tuple<std::string, std::string, std::string>(sendEvent.sendid, type, target);
if (delayMs == 0) {
Event copy(sendEvent);
return eventReady(copy, sendEvent.uuid);
} else {
return _delayQueue.enqueueDelayed(sendEvent, delayMs, sendEvent.uuid);
}
}
void InterpreterImpl::cancelDelayed(const std::string& sendId) {
std::lock_guard<std::recursive_mutex> lock(_delayMutex);
// we need to find the uuids for the given sendid
for (auto evIter = _delayedEventTargets.begin(); evIter != _delayedEventTargets.end();) {
// inline deletion for maps: http://stackoverflow.com/a/263958/990120
if (std::get<0>(evIter->second) == sendId) {
_delayQueue.cancelDelayed(evIter->first);
evIter = _delayedEventTargets.erase(evIter);
} else {
evIter++;
}
}
}
void InterpreterImpl::eventReady(Event& sendEvent, const std::string& eventUUID) {
std::lock_guard<std::recursive_mutex> lock(_delayMutex);
// we only arrive here after the delay already passed!
assert(_delayedEventTargets.find(eventUUID) != _delayedEventTargets.end());
std::string type = std::get<1>(_delayedEventTargets[eventUUID]);
std::string target = std::get<2>(_delayedEventTargets[eventUUID]);
// test 172
if (type.size() == 0) {
type = "http://www.w3.org/TR/scxml/#SCXMLEventProcessor";
}
_delayedEventTargets.erase(eventUUID);
if (_ioProcs.find(type) != _ioProcs.end()) {
_ioProcs[type].eventFromSCXML(target, sendEvent);
} else {
ERROR_PLATFORM_THROW("No IO processor " + type + " known");
}
}
void InterpreterImpl::invoke(const std::string& type, const std::string& src, bool autoForward, xercesc::DOMElement* finalize, const Event& invokeEvent) {
std::string tmp;
if (src.size() > 0) {
URL url(src);
if (!url.isAbsolute()) {
url = URL::resolve(url, _baseURL);
}
tmp = (std::string)url;
}
std::shared_ptr<InvokerImpl> invokerImpl = _factory->createInvoker(type, this);
invokerImpl->setFinalize(finalize);
_invokers[invokeEvent.invokeid] = invokerImpl;
_invokers[invokeEvent.invokeid].invoke(tmp, invokeEvent);
if (autoForward) {
_autoForwarders.insert(invokeEvent.invokeid);
}
}
void InterpreterImpl::uninvoke(const std::string& invokeId) {
if (_invokers.find(invokeId) != _invokers.end()) {
_invokers[invokeId].uninvoke();
_autoForwarders.erase(invokeId);
}
}
}
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