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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2022 - Raw Material Software Limited
JUCE is an open source library subject to commercial or open-source
licensing.
The code included in this file is provided under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
To use, copy, modify, and/or distribute this software for any purpose with or
without fee is hereby granted provided that the above copyright notice and
this permission notice appear in all copies.
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
DISCLAIMED.
==============================================================================
*/
namespace juce
{
class LockingAsyncUpdater::Impl : public CallbackMessage
{
public:
explicit Impl (std::function<void()> cb)
: callback (std::move (cb)) {}
void clear()
{
const ScopedLock lock (mutex);
deliver = false;
callback = nullptr;
}
void trigger()
{
{
const ScopedLock lock (mutex);
if (deliver)
return;
deliver = true;
}
if (! post())
cancel();
}
void cancel()
{
const ScopedLock lock (mutex);
deliver = false;
}
bool isPending()
{
const ScopedLock lock (mutex);
return deliver;
}
void messageCallback() override
{
const ScopedLock lock (mutex);
if (std::exchange (deliver, false))
NullCheckedInvocation::invoke (callback);
}
private:
CriticalSection mutex;
std::function<void()> callback;
bool deliver = false;
};
//==============================================================================
LockingAsyncUpdater::LockingAsyncUpdater (std::function<void()> callbackToUse)
: impl (new Impl (std::move (callbackToUse))) {}
LockingAsyncUpdater::LockingAsyncUpdater (LockingAsyncUpdater&& other) noexcept
: impl (std::exchange (other.impl, nullptr)) {}
LockingAsyncUpdater& LockingAsyncUpdater::operator= (LockingAsyncUpdater&& other) noexcept
{
LockingAsyncUpdater temp { std::move (other) };
std::swap (temp.impl, impl);
return *this;
}
LockingAsyncUpdater::~LockingAsyncUpdater()
{
if (impl != nullptr)
impl->clear();
}
void LockingAsyncUpdater::triggerAsyncUpdate()
{
if (impl != nullptr)
impl->trigger();
else
jassertfalse; // moved-from!
}
void LockingAsyncUpdater::cancelPendingUpdate() noexcept
{
if (impl != nullptr)
impl->cancel();
else
jassertfalse; // moved-from!
}
void LockingAsyncUpdater::handleUpdateNowIfNeeded()
{
if (impl != nullptr)
impl->messageCallback();
else
jassertfalse; // moved-from!
}
bool LockingAsyncUpdater::isUpdatePending() const noexcept
{
if (impl != nullptr)
return impl->isPending();
jassertfalse; // moved-from!
return false;
}
} // namespace juce
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