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/* -*- 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: */
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