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kwiver_logger_manager.cxx
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kwiver_logger_manager.cxx
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/*ckwg +29
* Copyright 2015 by Kitware, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither name of Kitware, Inc. nor the names of any contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "kwiver_logger_manager.h"
#include "kwiver_logger_factory.h"
#include "default_logger.h"
#include <kwiversys/DynamicLoader.hxx>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <mutex>
/*
* Note: This must be thread safe.
*
* Also: In order to make this work, it must be possible to create
* loggers before the manager has been initialized. This means that
* the initialization is flexible, adaptive and has a reasonable
* default.
*/
typedef kwiversys::DynamicLoader DL;
namespace kwiver {
namespace vital {
namespace logger_ns {
class kwiver_logger_factory;
}
//
// Pointer to our single instance.
//
kwiver_logger_manager* kwiver_logger_manager::s_instance = 0;
#define PLUGIN_ENV_VAR "VITAL_LOGGER_FACTORY"
// ------------------------------------------------------------------
/*
* Private implememtation
*
*/
class kwiver_logger_manager::impl
{
public:
impl() = default;
~impl() = default;
std::unique_ptr< logger_ns::kwiver_logger_factory > m_logFactory;
// Current library handle
kwiversys::DynamicLoader::LibraryHandle m_libHandle;
};
// ----------------------------------------------------------------
/** Constructor.
*
*
*/
kwiver_logger_manager
::kwiver_logger_manager()
: m_impl( new impl )
{
// Need to create a factory class at this point because loggers
// are created by static initializers. we can wait no longer until
// we provide a method for creating these loggers.
bool try_default(false);
std::string factory_name;
char const* factory = std::getenv( PLUGIN_ENV_VAR );
if ( factory == 0 )
{
// If no special factory is specified, try default name
try_default = true;
factory_name = "vital_logger_plugin";
}
else
{
factory_name = factory;
}
factory_name += DL::LibExtension();
try
{
// Dynamically load logger factory.
load_factory( factory_name );
return;
}
catch( std::runtime_error &e )
{
// Only give error if the environment specified logger could not be found
if ( ! try_default )
{
std::cerr << "ERROR: Could not load logger factory as specified in environment variable \""
<< PLUGIN_ENV_VAR "\"\n"
<< "Defaulting to built-in logger.\n"
<< e.what() << std::endl;
}
else
{
std::cerr << "INFO: Could not load default logger factory. Using built-in logger." << std::endl;
}
}
// Create a default logger back end
m_impl->m_logFactory.reset( new logger_ns::logger_factory_default() );
}
kwiver_logger_manager
::~kwiver_logger_manager()
{ }
// ----------------------------------------------------------------
/** Get singleton instance.
*
*
*/
kwiver_logger_manager * kwiver_logger_manager
::instance()
{
static std::mutex local_lock; // synchronization lock
if (0 != s_instance)
{
return s_instance;
}
std::lock_guard<std::mutex> lock(local_lock);
if (0 == s_instance)
{
// create new object
s_instance = new kwiver_logger_manager();
}
return s_instance;
}
// ----------------------------------------------------------------
/* Get address of logger object.
*
* These are unbound functions
*/
VITAL_LOGGER_EXPORT
logger_handle_t
get_logger( char const* name )
{
return kwiver_logger_manager::instance()->m_impl->m_logFactory->get_logger(name);
}
// ------------------------------------------------------------------
VITAL_LOGGER_EXPORT
logger_handle_t
get_logger( std::string const& name )
{
return get_logger( name.c_str() );
}
// ------------------------------------------------------------------
VITAL_LOGGER_EXPORT
void
kwiver_logger_manager
::set_logger_factory( std::unique_ptr< logger_ns::kwiver_logger_factory >&& fact )
{
m_impl->m_logFactory.swap( fact );
}
// ------------------------------------------------------------------
std::string const&
kwiver_logger_manager
::get_factory_name() const
{
return m_impl->m_logFactory->get_factory_name();
}
// ------------------------------------------------------------------
void
kwiver_logger_manager
::load_factory( std::string const& lib_name )
{
typedef logger_ns::kwiver_logger_factory* (*FactoryPointer_t)();
m_impl->m_libHandle = DL::OpenLibrary( lib_name.c_str() );
if ( ! m_impl->m_libHandle )
{
std::stringstream str;
str << "Unable to load logger factory plug-in: " << DL::LastError();
throw std::runtime_error( str.str() );
}
// Get our entry symbol
FactoryPointer_t fp = reinterpret_cast< FactoryPointer_t >(
DL::GetSymbolAddress( m_impl->m_libHandle, "kwiver_logger_factory" ) );
if ( ! fp )
{
DL::CloseLibrary( m_impl->m_libHandle );
std::stringstream str;
str << "Unable to bind to function: kwiver_logger_factory() "
<< DL::LastError();
throw std::runtime_error( str.str() );
}
// Get pointer to new logger factory object
m_impl->m_logFactory.reset( fp() );
}
} } // end namespace