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messaging.cpp
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//===-- examples/messaging/messaging.cpp ------------------------*- C++ -*-===//
//
// The RoSA Framework
//
//===----------------------------------------------------------------------===//
///
/// \file examples/messaging/messaging.cpp
///
/// \author David Juhasz (david.juhasz@tuwien.ac.at)
///
/// \date 2017
///
/// \brief An example showcasing features related to the \c rosa::Message class.
///
//===----------------------------------------------------------------------===//
#include "rosa/config/version.h"
#include "rosa/core/MessageHandler.hpp"
#include "rosa/support/log.h"
#include "rosa/support/terminal_colors.h"
using namespace rosa;
using namespace rosa::terminal;
int main(void) {
LOG_INFO_STREAM << library_string() << " -- " << Color::Red << "messaging"
<< Color::Default << '\n';
auto &Log = LOG_INFO_STREAM << '\n';
// Message interface.
auto PMsg = Message::create<uint8_t, uint16_t>(1, 2);
auto &Msg = *PMsg;
Log << "Checking on a 'Message with TypeList<<uint8_t, uint16_t>>':"
<< "\n Size: " << Msg.Size
<< "\n Pos 0 is uint8_t: " << Msg.isTypeAt<uint8_t>(0)
<< "\n Pos 1 is uint16_t: " << Msg.isTypeAt<uint16_t>(1)
<< "\n Pos 2 is uint32_t: " << Msg.isTypeAt<uint32_t>(1)
<< "\n Value at pos 0: " << PRINTABLE(Msg.valueAt<uint8_t>(0))
<< "\n Value at pos 1: " << Msg.valueAt<uint16_t>(1) << "\n\n";
// MessageMatcher.
using MyMatcher = MsgMatcher<uint8_t, uint16_t>;
Log << "Matching against 'TypeList<uint8_t, uint16_t>':"
<< "\n matching: " << MyMatcher::doesStronglyMatch(Msg);
auto Vs = MyMatcher::extractedValues(Msg);
Log << "\n value: '(" << PRINTABLE(std::get<0>(Vs)) << ", "
<< std::get<1>(Vs) << ")'\n\n";
using MyWrongMatcher = MsgMatcher<uint8_t, uint8_t>;
Log << "Matching against 'TypeList<uint8_t, uint8_t>':"
<< "\n matching: " << MyWrongMatcher::doesStronglyMatch(Msg) << "\n\n";
using MyAtom = AtomConstant<atom("atom")>;
const MyAtom &A = MyAtom::Value;
using MyNAtom = AtomConstant<atom("noatom")>;
auto PAMsg = Message::create(A);
auto &AMsg = *PAMsg;
Log << "Checking on a 'Message with TypeList<AtomConstant<atom(\"atom\")>>':"
<< "\n Size: " << AMsg.Size
<< "\n Pos 0 is 'AtomValue': " << AMsg.isTypeAt<AtomValue>(0)
<< "\n Pos 0 is 'AtomConstant<atom(\"noatom\")>': "
<< AMsg.isTypeAt<MyNAtom>(0) << "\n\n";
using MyAtomMatcher = MsgMatcher<MyAtom>;
Log << "Matching against 'TypeList<AtomConstant<atom(\"atom\")>>':"
<< "\n matching: " << MyAtomMatcher::doesStronglyMatch(AMsg)
<< "\n value: '("
<< to_string(std::get<0>(MyAtomMatcher::extractedValues(AMsg))) << ")'"
<< "\n\n";
using MyWrongAtomMatcher = MsgMatcher<MyNAtom>;
Log << "Matching against 'TypeList<AtomConstant<atom(\"noatom\")>>':"
<< "\n matching: " << MyWrongAtomMatcher::doesStronglyMatch(AMsg)
<< "\n\n";
// Invoker.
auto IP = Invoker::wrap(Invoker::F<MyAtom>([&Log](MyAtom) noexcept->void {
Log << "** Handling 'Message with "
"TypeList<AtomConstant<atom(\"atom\")>>'.\n";
}));
auto &I = *IP; // Get a reference from the pointer.
Log << "Invoking a function of signature 'void(AtomConstant<atom(\"atom\")>) "
"noexcept':"
<< "\n with 'Message with TypeList<uint8_t, uint16_t>'"
<< "\n does Message match Invoker: " << I.match(Msg)
<< "\n invoking...";
I(Msg);
Log << "\n with 'Message with TypeList<AtomConstant<atom(\"atom\")>>'..."
<< "\n does Message match Invoker: " << I.match(AMsg)
<< "\n invoking...";
I(AMsg);
Log << "\n\n";
// MessageHandler.
MessageHandler Handler{
Invoker::F<uint8_t, uint16_t>([&Log](uint8_t, uint16_t) {
Log << "** Handling 'Message with TypeList<uint8_t, uint16_t>'\n";
}),
Invoker::F<MyAtom>([&Log](MyAtom) {
Log << "** Handling 'Message with "
"TypeList<AtomConstant<atom(\"atom\")>>'\n";
})};
auto PANMsg = Message::create(MyNAtom::Value);
auto &ANMsg = *PANMsg;
Log << "Handling Messages with 'MessageHandler "
"{ Invoker::F<uint8_t, uint16_t>, "
"Invoker::F<AtomConstant<atom(\"atom\")>> }':"
<< "\n 'Message with TypeList<uint8_t, uint16_t>'"
<< "\n can handle: " << Handler.canHandle(Msg) << "\n handling...";
Handler(Msg);
Log << "\n 'Message with TypeList<AtomConstant<atom(\"atom\")>>'"
<< "\n can handle: " << Handler.canHandle(AMsg) << "\n handling...";
Handler(AMsg);
Log << "\n 'Message with TypeList<AtomConstant<atom(\"noatom\")>>'"
<< "\n can handle: " << Handler.canHandle(ANMsg)
<< "\n handling...";
Handler(ANMsg);
Log << "\n\n";
Log << "Terminating, destroying automatic variables.\n";
return 0;
}

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