handlertable.cpp

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

//%2006////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
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#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) + ".exe";
#elif defined(PEGASUS_OS_OS400)
    Uint32 lastSlash = handlerId.reverseFind('/');
    if (lastSlash == PEG_NOT_FOUND)
        throw DynamicLoadFailed(handlerId);
    String fileName = handlerId.subString(0, lastSlash);
    String os400HandlerId = handlerId.subString(lastSlash + 1);
#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 (...)
        {
            PEGASUS_ASSERT(0);
            PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL3,
                "Unknown error caught from " +
                    _handlers[i].handlerId +
                    " terminate() method");
        }

        delete _handlers[i].handler;
    }
}

PEGASUS_NAMESPACE_END