73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
/**
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* @file lazyeventapi.cpp
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* @author Nat Goodspeed
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* @date 2022-06-17
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* @brief Implementation for lazyeventapi.
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*
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* $LicenseInfo:firstyear=2022&license=viewerlgpl$
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* Copyright (c) 2022, Linden Research, Inc.
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* $/LicenseInfo$
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*/
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// Precompiled header
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#include "linden_common.h"
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// associated header
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#include "lazyeventapi.h"
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// STL headers
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// std headers
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#include <algorithm> // std::find_if
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// external library headers
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// other Linden headers
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#include "llevents.h"
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#include "llsdutil.h"
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LL::LazyEventAPIBase::LazyEventAPIBase(
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const std::string& name, const std::string& desc, const std::string& field)
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{
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// populate embedded LazyEventAPIParams instance
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mParams.name = name;
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mParams.desc = desc;
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mParams.field = field;
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// mParams.init and mOperations are populated by subsequent add() calls.
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// Our raison d'etre: register as an LLEventPumps::PumpFactory
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// so obtain() will notice any request for this name and call us.
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// Of course, our subclass constructor must finish running (making add()
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// calls) before mParams will be fully populated, but we expect that to
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// happen well before the first LLEventPumps::obtain(name) call.
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mRegistered = LLEventPumps::instance().registerPumpFactory(
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name,
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[this](const std::string& name){ return construct(name); });
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}
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LL::LazyEventAPIBase::~LazyEventAPIBase()
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{
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// If our constructor's registerPumpFactory() call was unsuccessful, that
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// probably means somebody else claimed the name first. If that's the
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// case, do NOT unregister their name out from under them!
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// If this is a static instance being destroyed at process shutdown,
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// LLEventPumps will probably have been cleaned up already.
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if (mRegistered && ! LLEventPumps::wasDeleted())
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{
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// unregister the callback to this doomed instance
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LLEventPumps::instance().unregisterPumpFactory(mParams.name);
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}
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}
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LLSD LL::LazyEventAPIBase::getMetadata(const std::string& name) const
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{
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// Since mOperations is a vector rather than a map, just search.
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auto found = std::find_if(mOperations.begin(), mOperations.end(),
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[&name](const auto& namedesc)
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{ return (namedesc.first == name); });
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if (found == mOperations.end())
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return {};
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// LLEventDispatcher() supplements the returned metadata in different
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// ways, depending on metadata provided to the specific add() method.
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// Don't try to emulate all that. At some point we might consider more
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// closely unifying LLEventDispatcher machinery with LazyEventAPI, but for
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// now this will have to do.
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return llsd::map("name", found->first, "desc", found->second);
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}
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