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MsvDll.cpp
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MsvDll.cpp
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/**************************************************************************************************//**
* @addtogroup MDLLFACTORY
* @{
******************************************************************************************************/
/**************************************************************************************************//**
* @file
* @brief MarsTech Dll Implementation
* @details Contains implementation @ref MsvDll.
* @author Martin Svoboda
* @date 06.04.2019
* @copyright GNU General Public License (GPLv3).
******************************************************************************************************/
/*
This file is part of MarsTech Dll Factory.
MarsTech Dependency Injection is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
MarsTech Promise Like Syntax is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Foobar. If not, see <https://www.gnu.org/licenses/>.
*/
#include "MsvDll.h"
#include "MsvDll_Factory.h"
#include "merror/MsvErrorCodes.h"
/********************************************************************************************************************************
* Constructors and destructors
********************************************************************************************************************************/
MsvDll::MsvDll(std::shared_ptr<MsvLogger> spLogger, std::shared_ptr<MsvDll_Factory> spFactory):
m_initialized(false),
m_pGetDllObjectFunction(nullptr),
m_spDllAdapter(nullptr),
m_spLogger(spLogger),
m_spFactory(spFactory ? spFactory : MsvDll_Factory::Get())
{
}
MsvDll::~MsvDll()
{
Uninitialize();
}
/********************************************************************************************************************************
* IMsvDll public methods
********************************************************************************************************************************/
MsvErrorCode MsvDll::Initialize(const char* dllPath)
{
std::lock_guard<std::recursive_mutex> lock(m_lock);
MSV_LOG_INFO(m_spLogger, "Initializing DLL library \"{}\".", dllPath);
if (Initialized())
{
MSV_LOG_INFO(m_spLogger, "DLL library \"{}\" has been already initialized.", dllPath);
return MSV_ALREADY_INITIALIZED_INFO;
}
void* pDllAddress = nullptr;
m_spDllAdapter = m_spFactory->GetIMsvDllAdapter(m_spLogger);
if (!m_spDllAdapter)
{
MSV_LOG_ERROR(m_spLogger, "Create MsvDllAdapter object for DLL library \"{}\" failed.", dllPath);
return MSV_ALLOCATION_ERROR;
}
MSV_RETURN_FAILED(m_spDllAdapter->LoadDllLibrary(dllPath));
m_initialized = true;
return MSV_SUCCESS;
}
MsvErrorCode MsvDll::Uninitialize()
{
std::lock_guard<std::recursive_mutex> lock(m_lock);
MSV_LOG_INFO(m_spLogger, "Uninitializing DLL library.");
if (!Initialized())
{
MSV_LOG_INFO(m_spLogger, "DLL library has iot been initialized.");
return MSV_NOT_INITIALIZED_INFO;
}
if (GetDllReferenceCount() > 0)
{
//DLL has referenced objects (it might me shared_ptr in DLL but it might be shared_ptr anywhere else, we don't know) -> just log WARNING
MSV_LOG_WARN(m_spLogger, "Unloading DLL library with references - reference count: {}", GetDllReferenceCount());
//return MSV_INVALID_DATA_ERROR;
}
//delete all weak references and unload library
m_dllObjects.clear();
MSV_RETURN_FAILED(m_spDllAdapter->UnloadDllLibrary());
m_pGetDllObjectFunction = nullptr;
m_spDllAdapter.reset();
m_initialized = false;
return MSV_SUCCESS;
}
bool MsvDll::Initialized() const
{
std::lock_guard<std::recursive_mutex> lock(m_lock);
return m_initialized;
}
MsvErrorCode MsvDll::GetDllObject(const char* id, std::shared_ptr<IMsvDllObject>& spDllObject, std::shared_ptr<IMsvDllDecorator> spDecorator)
{
std::lock_guard<std::recursive_mutex> lock(m_lock);
MSV_LOG_INFO(m_spLogger, "Getting DLL object \"{}\".", id);
if (!Initialized())
{
MSV_LOG_ERROR(m_spLogger, "Trying to get DLL object \"{}\" from uninitialized DLL.", id);
return MSV_NOT_INITIALIZED_ERROR;
}
//check if is in map
std::map<std::string, std::weak_ptr<IMsvDllObject>>::iterator it = m_dllObjects.find(id);
if (it != m_dllObjects.end())
{
if ((spDllObject = it->second.lock()))
{
return MSV_SUCCESS;
}
}
//not in map or weak_ptr is expired
//object is not in the map -> load it
std::shared_ptr<IMsvDllObject> spInnerDllObject;
if (spDecorator)
{
//it is DLL without exported function GetDllObject (probably C DLL, third party DLL, etc.)
MSV_RETURN_FAILED(spDecorator->DecorateDllObject(id, m_spDllAdapter));
spInnerDllObject = spDecorator;
}
else
{
//it is DLL with exported function GetDllObject
MsvErrorCode errorCode = MSV_SUCCESS;
//check if GetDllObject is already loaded and load it if not
if (!m_pGetDllObjectFunction)
{
void* pDllAddress = nullptr;
if (MSV_FAILED(errorCode = m_spDllAdapter->GetDllAddress("GetDllObject", pDllAddress)))
{
MSV_LOG_ERROR(m_spLogger, "Get DLL address \"GetDllObject\" (for object \"{}\") failed with error: {0:x}.", id, errorCode);
return errorCode;
}
//m_pGetDllObjectFunction = (MsvErrorCode (*)(const char* id, std::shared_ptr<IMsvDllObject>& spDllObject))pDllAddress;
m_pGetDllObjectFunction = reinterpret_cast<MsvErrorCode(*)(const char* id, std::shared_ptr<IMsvDllObject>& spDllObject)>(pDllAddress);
}
//GetDllObject function is loaded -> load requested DLL object
if (MSV_FAILED(errorCode = m_pGetDllObjectFunction(id, spInnerDllObject)))
{
MSV_LOG_ERROR(m_spLogger, "Get DLL object \"{}\" from DLL failed with error: {0:x}.", id, errorCode);
return errorCode;
}
}
//insert object to map
m_dllObjects[id] = spInnerDllObject;
spDllObject = spInnerDllObject;
return MSV_SUCCESS;
}
std::int64_t MsvDll::GetDllReferenceCount() const
{
std::lock_guard<std::recursive_mutex> lock(m_lock);
std::int64_t referenceCount = 0;
//get all objects from DLL and add reference count
std::map<std::string, std::weak_ptr<IMsvDllObject>>::const_iterator endIt = m_dllObjects.end();
for (std::map<std::string, std::weak_ptr<IMsvDllObject>>::const_iterator it = m_dllObjects.begin(); it != endIt; ++it)
{
referenceCount += it->second.use_count();
//consider to add reference counting to IMsvDllObject
//referenceCount += it->second->GetReferenceCount();
}
return referenceCount;
}
/** @} */ //End of group MDLLFACTORY.