consumermodule.cpp

Pegasus is an open-source implementationof the DMTF CIM and WBEM standards. It is designed to be por

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#include "ConsumerModule.h"

#include <Pegasus/Common/FileSystem.h>
#include <Pegasus/Common/MessageLoader.h> //l10n
#include <Pegasus/Common/Tracer.h>
#include <Pegasus/Common/ThreadPool.h>

#include <Pegasus/Provider/CIMIndicationConsumerProvider.h>
#include <Pegasus/DynListener/ConsumerManager.h>

PEGASUS_USING_STD;
PEGASUS_NAMESPACE_BEGIN


ConsumerModule::ConsumerModule()
{
}

ConsumerModule::~ConsumerModule(void)
{
}

// The caller assumes the repsonsibility of making sure the libraryPath is correctly formatted
CIMIndicationConsumerProvider* ConsumerModule::load(const String & consumerName, const String & libraryPath)
{
    PEG_METHOD_ENTER(TRC_LISTENER, "ConsumerModule::load");

    //check whether the module is cached; if it's not already in memory, load it
    if (!_library.isLoaded())
    {
        if (!FileSystem::exists(libraryPath) || !FileSystem::canRead(libraryPath))
        {
            throw Exception(MessageLoaderParms("DynListener.ConsumerModule.INVALID_LIBRARY_PATH",
               "The library ($0:$1) does not exist or cannot be read.",
               libraryPath,
               consumerName));
        }

        _library = DynamicLibrary(libraryPath);
    }

    PEG_TRACE_STRING(TRC_LISTENER, Tracer::LEVEL2, "Loading library: " + consumerName);

    if (!_library.load())
    {
        throw Exception(MessageLoaderParms("DynListener.ConsumerModule.CANNOT_LOAD_LIBRARY",
                                   "Cannot load consumer library ($0:$1), load error $2",
                                   _library.getFileName(),
                                   consumerName,
                                   _library.getLoadErrorMessage()));
    }

    PEG_TRACE_STRING(TRC_LISTENER, Tracer::LEVEL2, "Successfully loaded library " + consumerName);

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

    if (!createProvider)
    {
        _library.unload();
        throw Exception(MessageLoaderParms("DynListener.ConsumerModule.ENTRY_POINT_NOT_FOUND",
               "The entry point for consumer library ($0:$1) cannot be found.",
               libraryPath,
               consumerName));
    }

    // create the consumer provider
    CIMProvider* providerRef = createProvider(consumerName);

    if(!providerRef)
    {
        _library.unload();
        throw Exception(MessageLoaderParms("DynListener.ConsumerModule.CREATE_PROVIDER_FAILED",
               "createProvider failed for consumer library ($0:$1)",
               libraryPath,
               consumerName));
    }

    // test for the appropriate interface
    CIMIndicationConsumerProvider* consumerRef = dynamic_cast<CIMIndicationConsumerProvider *>(providerRef);
    if(!consumerRef)
    {
        _library.unload();
        throw Exception(MessageLoaderParms("DynListener.ConsumerModule.CONSUMER_IS_NOT_A",
            "Consumer ($0:$1) is not a CIMIndicationConsumerProvider.",
            libraryPath,
            consumerName));
    }

    PEG_METHOD_EXIT();
    return consumerRef;
}

void ConsumerModule::unloadModule(void)
{
    PEG_METHOD_ENTER(TRC_LISTENER, "ConsumerModule::unloadModule");

    PEG_TRACE_STRING(TRC_LISTENER, Tracer::LEVEL3,
        "Unloading module " + _library.getFileName());
    _library.unload();

    PEG_METHOD_EXIT();
}

PEGASUS_NAMESPACE_END