//%LICENSE////////////////////////////////////////////////////////////////
//
// Licensed to The Open Group (TOG) under one or more contributor license
// agreements.  Refer to the OpenPegasusNOTICE.txt file distributed with
// this work for additional information regarding copyright ownership.
// Each contributor licenses this file to you under the OpenPegasus Open
// Source License; you may not use this file except in compliance with the
// License.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//////////////////////////////////////////////////////////////////////////
//
//%/////////////////////////////////////////////////////////////////////////////

#include <Pegasus/Common/Config.h>
#include <cstdlib>
#include <Pegasus/Common/FileSystem.h>
#include <Pegasus/Common/Tracer.h>
#include "HandlerTable.h"

PEGASUS_USING_STD;

PEGASUS_NAMESPACE_BEGIN

HandlerTable::HandlerTable()
{
}

CIMHandler* HandlerTable::getHandler(
    const String& handlerId,
    CIMRepository* repository)
{
    CIMHandler* handler;
    {
        ReadLock lock(_handlerTableLock);
        handler = _lookupHandler(handlerId);
        if (handler)
        {
            return handler;
        }
    }

    {
        WriteLock lock(_handlerTableLock);
        handler = _lookupHandler(handlerId);
        // Note: Lock handler table until handler initialize is done.
        // This is ok for handler since the initialization is simple.
        if (!handler)
        {
            handler = _loadHandler(handlerId);
            handler->initialize(repository);
        }

        return handler;
    }
}

CIMHandler* HandlerTable::_lookupHandler(const String& handlerId)
{
    for (Uint32 i = 0, n = _handlers.size(); i < n; i++)
        if (String::equal(_handlers[i].handlerId, handlerId))
            return _handlers[i].handler;

    return 0;
}

typedef CIMHandler* (*CreateHandlerFunc)(const String&);

CIMHandler* HandlerTable::_loadHandler(const String& handlerId)
{
#if defined (PEGASUS_OS_VMS)
    String provDir =
        ConfigManager::getInstance()->getCurrentValue("providerDir");
    String fileName = ConfigManager::getHomedPath(provDir) + "/" +
        FileSystem::buildLibraryFileName(handlerId);
#else
    String fileName = ConfigManager::getHomedPath((PEGASUS_DEST_LIB_DIR) +
        String("/") + FileSystem::buildLibraryFileName(handlerId));
#endif

    HandlerEntry entry(handlerId, fileName);

    if (!entry.handlerLibrary.load())
    {
#if defined(PEGASUS_OS_TYPE_WINDOWS)
        throw DynamicLoadFailed(fileName);
#else
        throw DynamicLoadFailed(entry.handlerLibrary.getLoadErrorMessage());
#endif
    }

    // Lookup the create handler symbol:

    CreateHandlerFunc func = (CreateHandlerFunc)
        entry.handlerLibrary.getSymbol("PegasusCreateHandler");

    if (!func)
    {
        throw DynamicLookupFailed("PegasusCreateHandler");
    }

    // Create the handler:

    entry.handler = func(handlerId);

    //
    //  ATTN: to support dynamically pluggable handlers, the entry.handler
    //  returned from the PegasusCreateHandler_<handlerId> function would
    //  need to be validated to be non-null
    //
    PEGASUS_ASSERT(entry.handler);

    _handlers.append(entry);

    return entry.handler;
}

HandlerTable::~HandlerTable()
{
    for (Uint32 i = 0; i < _handlers.size(); i++)
    {
        //
        //  Call handler's terminate() method
        //
        try
        {
            _handlers[i].handler->terminate();
        }
        catch (...)
        {
            PEG_TRACE((TRC_DISCARDED_DATA, Tracer::LEVEL2,
                "Unknown error caught from %s terminate() method",
                (const char*)_handlers[i].handlerId.getCString()));
            PEGASUS_ASSERT(0);
        }

        delete _handlers[i].handler;
    }
}

PEGASUS_NAMESPACE_END
