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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/.
*/
#pragma once
#include <sal/types.h>
#include <basegfx/basegfxdllapi.h>
#include <memory>
#include <map>
#include <set>
namespace basegfx
{
class SystemDependentData;
typedef std::shared_ptr<SystemDependentData> SystemDependentData_SharedPtr;
typedef std::weak_ptr<SystemDependentData> SystemDependentData_WeakPtr;
class BASEGFX_DLLPUBLIC SystemDependentDataManager
{
private:
// noncopyable
SystemDependentDataManager(const SystemDependentDataManager&) = delete;
SystemDependentDataManager& operator=(const SystemDependentDataManager&) = delete;
public:
SystemDependentDataManager();
virtual ~SystemDependentDataManager();
// call from (and with) SystemDependentData objects when start/end/touch
// usage is needed
virtual void startUsage(basegfx::SystemDependentData_SharedPtr& rData) = 0;
virtual void endUsage(basegfx::SystemDependentData_SharedPtr& rData) = 0;
virtual void touchUsage(basegfx::SystemDependentData_SharedPtr& rData) = 0;
// flush all buffered data (e.g. cleanup/shutdown)
virtual void flushAll() = 0;
};
class BASEGFX_DLLPUBLIC MinimalSystemDependentDataManager final : public SystemDependentDataManager
{
private:
// example of a minimal SystemDependentDataManager. It *needs to hold*
// a SystemDependentData_SharedPtr while SystemDependentDataHolder's will
// use a SystemDependentData_WeakPtr. When the held SystemDependentData_SharedPtr
// is deleted, the corresponding SystemDependentData_WeakPtr will get void.
// To make this work, a minimal SystemDependentDataManager *has* to hold at
// least that one SystemDependentData_SharedPtr.
// That SystemDependentData_SharedPtr may be (e.g. Timer-based or resource-based)
// be freed then. This minimal implementation does never free it, so all stay valid.
// The instances may still be removed by endUsage calls, but there is no
// caching/buffering mechanism involved here at all. It's an example, but
// not used - better use an advanced derivation of SystemDependentDataManager
std::set< SystemDependentData_SharedPtr > maSystemDependentDataReferences;
public:
MinimalSystemDependentDataManager();
virtual ~MinimalSystemDependentDataManager() override;
virtual void startUsage(basegfx::SystemDependentData_SharedPtr& rData) override;
virtual void endUsage(basegfx::SystemDependentData_SharedPtr& rData) override;
virtual void touchUsage(basegfx::SystemDependentData_SharedPtr& rData) override;
virtual void flushAll() override;
};
class BASEGFX_DLLPUBLIC SystemDependentData
{
private:
// noncopyable
SystemDependentData(const SystemDependentData&) = delete;
SystemDependentData& operator=(const SystemDependentData&) = delete;
// reference to a SystemDependentDataManager, probably
// a single, globally used one, but not necessarily
SystemDependentDataManager& mrSystemDependentDataManager;
// Buffered CalculatedCycles, result of estimations using
// getHoldCyclesInSeconds and estimateUsageInBytes, executed
// using getHoldCyclesInSeconds. StartValue is 0 to detect
// not-yet-calculated state
sal_uInt32 mnCalculatedCycles;
public:
SystemDependentData(
SystemDependentDataManager& rSystemDependentDataManager);
// CAUTION! It is VERY important to keep this base class
// virtual, else typeid(class).hash_code() from derived classes
// will NOT work what is ESSENTIAL for the SystemDependentData
// mechanism to work properly. So DO NOT REMOVE virtual here, please.
virtual ~SystemDependentData();
// allow access to call startUsage/endUsage/touchUsage
// using getSystemDependentDataManager()
SystemDependentDataManager& getSystemDependentDataManager() { return mrSystemDependentDataManager; }
// Calculate HoldCyclesInSeconds based on using
// getHoldCyclesInSeconds and estimateUsageInBytes, the
// result is created once on-demand and buffered in
// mnCalculatedCycles
sal_uInt32 calculateCombinedHoldCyclesInSeconds() const;
// Size estimation of the entry in bytes - does not have to
// be used, but should be. Default returns zero what
// means there is no size estimation available. Override to
// offer useful data if you want to have better caching.
virtual sal_Int64 estimateUsageInBytes() const;
};
class BASEGFX_DLLPUBLIC SystemDependentDataHolder
{
private:
// Possibility to hold System-Dependent B2DPolygon-Representations
std::map< size_t, SystemDependentData_WeakPtr > maSystemDependentReferences;
// noncopyable
SystemDependentDataHolder(const SystemDependentDataHolder&) = delete;
SystemDependentDataHolder& operator=(const SystemDependentDataHolder&) = delete;
public:
SystemDependentDataHolder();
virtual ~SystemDependentDataHolder();
void addOrReplaceSystemDependentData(SystemDependentData_SharedPtr& rData);
SystemDependentData_SharedPtr getSystemDependentData(size_t hash_code) const;
};
} // end of namespace basegfx
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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