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BUG#:7749
TITLE: Trace Level checking (everything, but Pegasus/Server)

DESCRIPTION:

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// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
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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::LEVEL4,
        "Loading library(consumer module): " + 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::LEVEL3, 
        "Successfully loaded library(consumer module) " + 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::LEVEL4,
        "Unloading module " + _library.getFileName());
    _library.unload();

    PEG_METHOD_EXIT();
}

PEGASUS_NAMESPACE_END