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BUG#: 5356
TITLE: Consolidate reference counting logic in DynamicLibrary
DESCRIPTION: Move the load/unload counting logic from the provider managers to the DynamicLibrary class.  Also, consolidate DynamicLibraryUnix.cpp and DynamicLibraryVms.cpp into DynamicLibraryPOSIX.cpp.

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#include "ProviderModule.h"

#include <Pegasus/Common/FileSystem.h>
#include <Pegasus/Common/MessageLoader.h>

#ifdef PEGASUS_OS_OS400
# include "CreateProviderOS400SystemState.h"
#endif


PEGASUS_NAMESPACE_BEGIN

ProviderModule::ProviderModule(const String& fileName)
    : _library(fileName)
{
}

ProviderModule::~ProviderModule()
{
}

CIMProvider* ProviderModule::load(const String& providerName)
{
    // dynamically load the provider library
    if (!_library.load())
    {
        throw Exception(MessageLoaderParms(
            "ProviderManager.ProviderModule.CANNOT_LOAD_LIBRARY",
            "ProviderLoadFailure ($0:$1):Cannot load library, error: $2",
            _library.getFileName(),
            providerName,
            _library.getLoadErrorMessage()));
    }

    // find library entry point
    CIMProvider * (*createProvider)(const String &) =
        (CIMProvider* (*)(const String&))
            _library.getSymbol("PegasusCreateProvider");

    if (createProvider == 0)
    {
        _library.unload();
        throw Exception(MessageLoaderParms(
            "ProviderManager.ProviderModule.ENTRY_POINT_NOT_FOUND",
            "ProviderLoadFailure ($0:$1):entry point not found.",
            _library.getFileName(),
            providerName));
    }

    // invoke the provider entry point
#ifndef PEGASUS_OS_OS400
    CIMProvider* provider = createProvider(providerName);
#else
    // On OS/400, need to call a layer of code that does platform-specific
    // checks before calling the provider
    CIMProvider* provider = OS400_CreateProvider(
        providerName.getCString(), createProvider, _fileName);
#endif

    // test for the appropriate interface
    if (dynamic_cast<CIMProvider *>(provider) == 0)
    {
        _library.unload();
        throw Exception(MessageLoaderParms(
            "ProviderManager.ProviderModule.PROVIDER_IS_NOT_A",
            "ProviderLoadFailure ($0:$1):provider is not a CIMProvider.",
            _library.getFileName(),
            providerName));
    }

    return(provider);
}

void ProviderModule::unloadModule()
{
    _library.unload();
}

PEGASUS_NAMESPACE_END