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The new metatype framework replaces
EventFactory/DEFINE_EVENT_TYPEID/REGISTER_EVENT_TYPE; it is faster,
more functional and extensible. Of note:
- EventMetaType mostly reproduces the logic of EventFactory but supports
custom base event types not just for loading (that part EventFactory
also supported) but also for matching - previously you had to have
Event::is*Event() for base type matching. Now Quotient::is() can
match against both base and leaf types.
- Instead of DEFINE_EVENT_TYPEID and REGISTER_EVENT_TYPE there's now
a single macro, QUO_EVENT, intended for use in the way similar to
Q_OBJECT. Actually, the entire framework borrows heavily from
QMetaObject and Q_OBJECT. Making event types full-fledged QObjects
is still not considered because half of QObject functions would not
be applicable (e.g. signals/slots) while another half (in particular,
using Matrix type ids to select event types) would still have to be
done on top of QObject. And QML can just access events as
const QJsonObjects which is arguably more lightweight as well.
- QUO_BASE_EVENT is a new macro replacing EventFactory object
definitions. This was necessary for the same reason why Q_OBJECT is
a macro: aside from a static object definition, this macro
introduces a virtual function override to resolve the metatype at
runtime. This very mechanism is used to make event type
matching/casting as quick as possible
- QUO_BASE_EVENT and QUO_EVENT use the C++20 __VA_OPT__ feature that
is only available with the new MSVC preprocessor (see
https://docs.microsoft.com/en-us/cpp/preprocessor/preprocessor-experimental-overview);
the respective switch was added to CMakeLists.txt.
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This is aligned with the non-moving version.
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In a situation where you have an EventPtr that you want to place
somewhere as an `event_ptr_tt<SomeMoreSpecificEventType>` you have to
carefully check that the stored event is actually of
SomeMoreSpecificType and if it is, release() that event pointer,
downcast, and re-wrap it into that new event_ptr_tt - or, as can be seen
from the diff here, re-loadEvent() from JSON, which is simpler but
inefficient. To help clients, and the library, eventCast() can now
accept an rvalue smart pointer and do all the necessary things with it.
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fromJson() is generalised to accept any JSON-like type while passing
QJsonObject to JsonConverter<>::load (instead of doLoad). This allows to
(still) rely on JsonConverter<> as a customisation point while providing
an opportunity to overload fromJson for custom types in a pointed way
(specifically, by providing the overload for
`fromJson(const QJsonObject&)`), instead of having to go with full-blown
JsonConverter<> specialisation. This will be used in a further commit
to simplify ReceiptEvent definition.
Using if constexpr in combination with constraints (`requires()`) -
the first such case in Quotient codebase - allowed to put the entire
logic in a single JsonConverter<>::load() body instead of having a
facility JsonExporter<> class for SFINAE.
Aside from that, fromJson<QJsonValue, QJsonValue> is entirely dropped
because it's not supposed to be used that way (it's no-op after all);
reflecting that, Event::unsignedPart() and Event::contentPart() no more
default to QJsonValue as the expected return type, you have to
explicitly provide the type instead (and as one can see from the changes
in the commit, it's actually better that way since it's better
to validate the value inside JSON - e.g. check QString or QJsonObject
for emptiness - than the QJsonValue envelope which may still wrap
an empty value).
toJson() is also generalised, replacing 3 functions with one that has
a constexpr if to discern between two kinds of types.
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Apple Clang doesn't have those yet.
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...thanks to C++20 awesomeness. A notable change is that
wrap_in_function() (and respectively function_traits<>::function_type)
and fn_return_t alias are gone. The former are no more needed because
connectUntil/connectSingleShot no more use std::function. The latter
has been relatively underused and with the optimisation of switchOnType
hereby, could be completely replaced with std::invoke_result_t.
Rewriting connect* functions using constexpr and auto parameters made
the implementation 30% more compact and much easier to understand
(though still with a couple of - now thoroughly commented - tricky
places). Dropping std::function<> from it may also bring some (quite
modest, likely) performance benefits.
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To streamline adding of simple getters of content parts.
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This macro was defined in accountdataevents.h but adding one more
parameter (base class) makes it applicable to pretty much any event
with the content that has one key-value pair (though state events
already have a non-macro solution in the form of
`StateEvent<EventContent::SingleKeyValue>`). Now CustomEvent definition
in quotest.cpp can be replaced with a single line.
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This makes it easier and more intuitive to build a minimal JSON payload
for a given event type. A common basicJson() call point is also
convenient in template contexts (see next commits).
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This reverts commit 2cf44607cf0f057e147c2c4fe6dded6c13c58a8a (that was
stupid, honestly).
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Logging categories used by Quotient are not supposed to be exposed
externally, which basically forbids usage of logging in header files.
A more flexible solution would involve moving logging.h to private
headers but Quotient doesn't have that thing yet.
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It's too restrictive compared to switchOnType() overloads and doesn't
map to the case with a default value.
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- Templates and constexpr imply inline
- A function called from a single site better be inlined.
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On Windows QUOTIENT_API expands to different things depending on whether
the library is built or used. This results in confusing statements (and
MSVC erroring out on them, in some cases - see below - quite
legitimately) not only when the application includes Quotient headers
but also when the application defines custom events and uses
REGISTER_EVENT_TYPE to make them creatable from /sync responses.
To avoid repeated registration when dynamic linking is involved,
EventFactory<>::addMethod() now bluntly looks up the method for this
type in the vector of already registered methods. It would surely be
quicker to use a static variable instead; but since the refreshed API
for addMethod returns a reference to the factory method it's necessary
to do this lookup anyway. Once the primary goal of this branch is
achieved across platforms I might experiment with lighter ways to
register factory methods; for now here's a minimal change to make
the code build on Windows.
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Thanks to Sonar for reminding that constexpr implies inline.
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Before all, this fixes the problem with double-initialising of type ids;
it could have been fixed with a smaller change but EventTypeRegistry
is fairly superfluous now when inline variables are a thing and it's
possible to have an extensible registry system using literally pointers
to the memory that are guaranteed to be unique. That being said,
event_type_t is still QLatin1String and not a bare const char* (or
void*), mostly to stay on the safe side when it comes to type
identities: unlike const char*, QLatin1String's are deep-compared,
meaning that matching for switchOnType (former visit) occurs a bit
slower now. This may change in the future; but this is the first step
in getting rid of EventTypeRegistry.
This change means that initializeTypeId is no more needed; also, two
static member functions, typeId() and matrixTypeId(), are being replaced
with a single inline static member variable, TypeId. This commit doesn't
apply that transition across the event types, meaning that you'll get
a pile of warnings when compiling the library. These warnings will be
tackled in further commits within this branch.
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Strictly speaking, EventFactory can be further instantiated if any
client application figures they need a whole new base class for events
and respectively a separate EventFactory specialisation for it.
Where this whole commit started though was a linkage error because I
did not plan to expose Quotient-specific logging categories for linkage
(effectively, usage) from the client code - meanwhile the inline code
of EventFactory uses qDebug(EVENTS), meaning I had to either add
QUOTIENT_API to EVENTS or hide those invocations. This in turn led
to trimming the EventFactory constructor back to trivial implementation
and dropping the guard variable that was supposed to trace duplicate
EventFactory<BaseEventT> objects for the same BaseEventT - with the
reasoning that such situation is not really dangerous (unlike
EventTypeRegistry double-initialisation fiasco, see #413), and at the
same time it can be easily detected in the logs by duplicated factory
method registration messages. And while I was at it, I replaced the
meaningless bool in the return type of EventFactory<>::addMethod with
the slightly more (but still barely) useful reference to the inserted
factory method. One can (in theory) use it now if they need to turn
some event JSON into an object of some specific event type or nullptr
if the event type in the JSON payload doesn't match - but at the same
rate (for now at least) one can call makeIfMatches<EventT>() directly.
With this commit, both Quotest and Quaternion build and link using
either Clang or GCC even under -fvisibility=hidden. However, running
quotest now reproduces #413, which is a matter of event typeId
infrastructure refactoring, coming in further commits.
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This include all (hopefully) classes/structures and functions that have
non-inline definitions, as well as namespaces with Q_NAMESPACE since
those have non-inline (as of Qt 5.15) QMetaObject - for that a new
macro, QUO_NAMESPACE, has been devised to accommodate the lack of
Q_NAMESPACE_EXPORT in Qt before 5.14.
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The former code assumed that EventFactory<> is just a class-level shell
for a bunch of functions and a static data member that only exists to
allow specialisations to occur for the whole group together. On top of
that, setupFactory() and registerEventType() strived to protect this
group from double registration coming from static variables in an
anonymous namespace produced by REGISTER_EVENT_TYPE.
The whole thing is now de-static-ed: resolving the factory now relies
on class-static Event/RoomEvent/StateEventBase::factory variables
instead of factory_t type aliases; and REGISTER_EVENT_TYPE produces
non-static inline variables instead, obviating the need of
registerEventType/setupFactory kludge.
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Quotient::function_traits<> did not support member functions in a proper
way (i.e. the way std::invoke_result<> treats them, with the function's
owning class represented as the first parameter). Now that I gained
the skill and understanding in function_traits<> somewhat wicked
machinery, I could properly support member functions. Overloads and
generic lambdas are not supported but maybe we'll get to those one day.
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It has not much to do with the Visitor design pattern; also,
std::visit() has different conventions on the order of parameters.
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Proper linters recognise that the returned types are not primitive,
while people might still be confused a bit.
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Similar to contentPart() - apparently there are enough places across
the code that would benefit from it.
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Given that QJsonObject only accepts QStrings in the list constructor,
the template is useless cruft.
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There's a clash between Event::content() (a template function) and
RoomMessageEvent::content() (plain member). Out of these two, the name
more fits to the RME's member function - strictly speaking,
Event::content() retrieves a part of content, and so is renamed.
In addition, contentPart() defaults to QJsonValue now, which is pretty
intuitive (the function returns values from a JSON object) and allows
to implement more elaborate logic such as
if (const auto v = contentPart<>("key"_ls); v.isObject()) {
// foo
} else if (v.isString()) {
// bar
} else {
// boo
}
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Doesn't really help build times, instead breaking the build on older Qt.
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The "original JSON" wording is misleading: the returned JSON can be and
is routinely edited as a part of event construction, redaction, editing.
Also, originalJson() name is misleading in that it returns a stringified
(in a very specific way) JSON and not an object. You have to call
fullJson() to get the object, and originalJsonObject(), confusingly,
returns exactly the same thing but as a value rather than as
a reference. The original intention of keeping originalJsonObject() was
to make it Q_INVOKABLE or use it as an accessor for a Q_PROPERTY.
unfortunately, this was never really practical as discussed in
the previous commit.
All that implies that clients have to handle passing event JSON to QML
themselves, in the form they prefer (as an object or a string). The
added complexity is negligible though; on the other hand, there's added
flexibility in, e.g., choosing a compact instead of default JSON layout
or even generate a highlighted JSON representation.
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Makes compilation a tad lighter.
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Q_GADGET is generally used to enable two things outside of QObject:
Q_PROPERTY/Q_INVOKABLE and Q_ENUM/Q_FLAG. While the latter can be used
in its own right in QML, the former requires Q_GADGET instances to be
passed to QML by value, which is not really possible with
uncopyable/unassignable classes. Bottom line is that Q_PROPERTY in
anything derived from Quotient::Event is not viable, making Q_GADGET
macro useless unless there's a Q_ENUM/Q_FLAG (as is the case with
RoomMessageEvent, e.g.).
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DISABLE_MOVE is no more; instead, the library provides Q_DISABLE_MOVE
(and also Q_DISABLE_COPY_MOVE while at it) for Qt pre-5.13 that don't
have it yet. Same for QT_IGNORE_DEPRECATIONS - it only arrived in 5.15
but all the building pieces existed prior so libQuotient has it
regardless of the Qt version used for building.
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After going through all the files and the history of commits on them
it was clear that some copyright statements are obsolete (the code has
been overwritten since) and some are missing. This commit tries best to
remedy that, along with adding SPDX tags where they were still not used.
Also, a minimal SPDX convention is documented for further contributions.
Closes #426.
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Port existing copyright statement to reuse using licensedigger
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The breakage was caused by 639f1d48.
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In particular: removed unnecessary #includes, deprecated and no more
used constructs, replaced stored members with dynamic generation
from JSON (TypingEvent and, especially promising for performance,
ReceiptEvent)
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The override adds the event's origin timestamp
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The method grew large and a bit unwieldy over the years.
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Checking that BaseEventT descends from Event is really extraneous.
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They've been deprecated for almost a year by now.
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Unified *Key -> *KeyL identifiers in roommessageevent.cpp along the way.
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