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/**
* @file lazyeventapi.cpp
* @author Nat Goodspeed
* @date 2022-06-17
* @brief Implementation for lazyeventapi.
*
* $LicenseInfo:firstyear=2022&license=viewerlgpl$
* Copyright (c) 2022, Linden Research, Inc.
* $/LicenseInfo$
*/
// Precompiled header
#include "linden_common.h"
// associated header
#include "lazyeventapi.h"
// STL headers
// std headers
#include <algorithm> // std::find_if
// external library headers
// other Linden headers
#include "llevents.h"
#include "llsdutil.h"
LL::LazyEventAPIBase::LazyEventAPIBase(
const std::string& name, const std::string& desc, const std::string& field)
{
// populate embedded LazyEventAPIParams instance
mParams.name = name;
mParams.desc = desc;
mParams.field = field;
// mParams.init and mOperations are populated by subsequent add() calls.
// Our raison d'etre: register as an LLEventPumps::PumpFactory
// so obtain() will notice any request for this name and call us.
// Of course, our subclass constructor must finish running (making add()
// calls) before mParams will be fully populated, but we expect that to
// happen well before the first LLEventPumps::obtain(name) call.
mRegistered = LLEventPumps::instance().registerPumpFactory(
name,
[this](const std::string& name){ return construct(name); });
}
LL::LazyEventAPIBase::~LazyEventAPIBase()
{
// If our constructor's registerPumpFactory() call was unsuccessful, that
// probably means somebody else claimed the name first. If that's the
// case, do NOT unregister their name out from under them!
// If this is a static instance being destroyed at process shutdown,
// LLEventPumps will probably have been cleaned up already.
// That said, in a test program, LLEventPumps might never have been
// constructed to start with.
if (mRegistered && LLEventPumps::instanceExists())
{
// unregister the callback to this doomed instance
LLEventPumps::instance().unregisterPumpFactory(mParams.name);
}
}
LLSD LL::LazyEventAPIBase::getMetadata(const std::string& name) const
{
// Since mOperations is a vector rather than a map, just search.
auto found = std::find_if(mOperations.begin(), mOperations.end(),
[&name](const auto& namedesc)
{ return (namedesc.first == name); });
if (found == mOperations.end())
return {};
// LLEventDispatcher() supplements the returned metadata in different
// ways, depending on metadata provided to the specific add() method.
// Don't try to emulate all that. At some point we might consider more
// closely unifying LLEventDispatcher machinery with LazyEventAPI, but for
// now this will have to do.
return llsd::map("name", found->first, "desc", found->second);
}
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