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Diffstat (limited to '')
| -rw-r--r-- | comphelper/source/misc/asyncnotification.cxx | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/comphelper/source/misc/asyncnotification.cxx b/comphelper/source/misc/asyncnotification.cxx new file mode 100644 index 000000000..cb8a2f251 --- /dev/null +++ b/comphelper/source/misc/asyncnotification.cxx @@ -0,0 +1,259 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#include <comphelper/asyncnotification.hxx> +#include <comphelper/scopeguard.hxx> +#include <mutex> +#include <condition_variable> + +#include <cassert> +#include <stdexcept> +#include <vector> +#include <algorithm> + +namespace comphelper +{ + AnyEvent::AnyEvent() + { + } + + AnyEvent::~AnyEvent() + { + } + + namespace { + + struct ProcessableEvent + { + AnyEventRef aEvent; + ::rtl::Reference< IEventProcessor > xProcessor; + }; + + struct EqualProcessor + { + const ::rtl::Reference< IEventProcessor >& rProcessor; + explicit EqualProcessor( const ::rtl::Reference< IEventProcessor >& _rProcessor ) :rProcessor( _rProcessor ) { } + + bool operator()( const ProcessableEvent& _rEvent ) + { + return _rEvent.xProcessor.get() == rProcessor.get(); + } + }; + + } + + struct EventNotifierImpl + { + std::mutex aMutex; + std::condition_variable aPendingActions; + std::vector< ProcessableEvent > aEvents; + bool bTerminate; + // only used for AsyncEventNotifierAutoJoin + char const* name; + std::shared_ptr<AsyncEventNotifierAutoJoin> pKeepThisAlive; + + EventNotifierImpl() + : bTerminate(false) + , name(nullptr) + { + } + }; + + AsyncEventNotifierBase::AsyncEventNotifierBase() + : m_xImpl(new EventNotifierImpl) + { + } + + + AsyncEventNotifierBase::~AsyncEventNotifierBase() + { + } + + + void AsyncEventNotifierBase::removeEventsForProcessor( const ::rtl::Reference< IEventProcessor >& _xProcessor ) + { + std::scoped_lock aGuard( m_xImpl->aMutex ); + + // remove all events for this processor + m_xImpl->aEvents.erase(std::remove_if( m_xImpl->aEvents.begin(), m_xImpl->aEvents.end(), EqualProcessor( _xProcessor ) ), m_xImpl->aEvents.end()); + } + + + void SAL_CALL AsyncEventNotifierBase::terminate() + { + std::scoped_lock aGuard( m_xImpl->aMutex ); + + // remember the termination request + m_xImpl->bTerminate = true; + + // awake the thread + m_xImpl->aPendingActions.notify_all(); + } + + + void AsyncEventNotifierBase::addEvent( const AnyEventRef& _rEvent, const ::rtl::Reference< IEventProcessor >& _xProcessor ) + { + std::scoped_lock aGuard( m_xImpl->aMutex ); + + // remember this event + m_xImpl->aEvents.emplace_back( ProcessableEvent {_rEvent, _xProcessor} ); + + // awake the thread + m_xImpl->aPendingActions.notify_all(); + } + + + void AsyncEventNotifierBase::execute() + { + for (;;) + { + std::vector< ProcessableEvent > aEvents; + { + std::unique_lock aGuard(m_xImpl->aMutex); + m_xImpl->aPendingActions.wait(aGuard, + [this] { return m_xImpl->bTerminate || !m_xImpl->aEvents.empty(); } ); + if (m_xImpl->bTerminate) + return; + else + std::swap(aEvents, m_xImpl->aEvents); + } + for (ProcessableEvent& rEvent : aEvents) + { + assert(rEvent.xProcessor.is()); + rEvent.xProcessor->processEvent(*rEvent.aEvent); + } + aEvents.clear(); + } + } + + AsyncEventNotifier::AsyncEventNotifier(char const* name) + : salhelper::Thread(name) + { + } + + AsyncEventNotifier::~AsyncEventNotifier() + { + } + + void AsyncEventNotifier::execute() + { + return AsyncEventNotifierBase::execute(); + } + + void AsyncEventNotifier::terminate() + { + return AsyncEventNotifierBase::terminate(); + } + + namespace { + + std::mutex& GetTheNotifiersMutex() + { + static std::mutex MUTEX; + return MUTEX; + } + + } + + static std::vector<std::weak_ptr<AsyncEventNotifierAutoJoin>> g_Notifiers; + + void JoinAsyncEventNotifiers() + { + std::vector<std::weak_ptr<AsyncEventNotifierAutoJoin>> notifiers; + { + std::scoped_lock g(GetTheNotifiersMutex()); + notifiers = g_Notifiers; + } + for (std::weak_ptr<AsyncEventNotifierAutoJoin> const& wNotifier : notifiers) + { + std::shared_ptr<AsyncEventNotifierAutoJoin> const pNotifier( + wNotifier.lock()); + if (pNotifier) + { + pNotifier->terminate(); + pNotifier->join(); + } + } + // note it's possible that g_Notifiers isn't empty now in case of leaks, + // particularly since the UNO service manager isn't disposed yet + } + + AsyncEventNotifierAutoJoin::AsyncEventNotifierAutoJoin(char const* name) + { + m_xImpl->name = name; + } + + AsyncEventNotifierAutoJoin::~AsyncEventNotifierAutoJoin() + { + std::scoped_lock g(GetTheNotifiersMutex()); + // note: this doesn't happen atomically with the refcount + // hence it's possible this deletes > 1 or 0 elements + g_Notifiers.erase( + std::remove_if(g_Notifiers.begin(), g_Notifiers.end(), + [](std::weak_ptr<AsyncEventNotifierAutoJoin> const& w) { + return w.expired(); + } ), + g_Notifiers.end()); + } + + std::shared_ptr<AsyncEventNotifierAutoJoin> + AsyncEventNotifierAutoJoin::newAsyncEventNotifierAutoJoin(char const* name) + { + std::shared_ptr<AsyncEventNotifierAutoJoin> const ret( + new AsyncEventNotifierAutoJoin(name)); + std::scoped_lock g(GetTheNotifiersMutex()); + g_Notifiers.push_back(ret); + return ret; + } + + void AsyncEventNotifierAutoJoin::terminate() + { + return AsyncEventNotifierBase::terminate(); + } + + void AsyncEventNotifierAutoJoin::launch(std::shared_ptr<AsyncEventNotifierAutoJoin> const& xThis) + { + // see salhelper::Thread::launch + xThis->m_xImpl->pKeepThisAlive = xThis; + comphelper::ScopeGuard g([&xThis] { xThis->m_xImpl->pKeepThisAlive.reset(); }); + if (!xThis->create()) { + throw std::runtime_error("osl::Thread::create failed"); + } + g.dismiss(); + } + + void AsyncEventNotifierAutoJoin::run() + { + // see salhelper::Thread::run + comphelper::ScopeGuard g([this] { onTerminated(); }); + setName(m_xImpl->name); + execute(); + g.dismiss(); + } + + void AsyncEventNotifierAutoJoin::onTerminated() + { + // try to delete "this" + m_xImpl->pKeepThisAlive.reset(); + } + +} // namespace comphelper + + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |