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BUG#:7521
TITLE: Various problems in CMPI log message interfaces

DESCRIPTION: Adding the two new files for CMPI msg handling

//%2008////////////////////////////////////////////////////////////////////////
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// 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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//%/////////////////////////////////////////////////////////////////////////////
#ifndef _CMPIMsgHandleManager_H_
#define _CMPIMsgHandleManager_H_

#include <Pegasus/Common/Config.h>
#include <Pegasus/Common/ReadWriteSem.h>
#include <Pegasus/Common/MessageLoader.h>
#include <Pegasus/Common/ArrayInternal.h>
#include <Pegasus/Provider/CMPI/cmpidt.h>
#include <Pegasus/ProviderManager2/CMPI/Linkage.h>

PEGASUS_NAMESPACE_BEGIN

//
// This class is used to store and retrieve unique message file handles
// and map them to a pointer to MessageLoaderParms.
//
// To use this class first obtain the singleton instance using the
// getCMPIMsgHandleManager method.
//
// Note: The handle manager does not own the memory that is associated to
//       the handle through the pointer. It is the callers responsibility
//       to allocate and release the data behind the pointers.
//
class CMPIMsgHandleManager
{

public:

    ~CMPIMsgHandleManager();

    //
    // Retrieves the singleton instance of the handle manager.
    //
    static CMPIMsgHandleManager* getCMPIMsgHandleManager(void);

    //
    // Obtains a new unique handle and associates it with the given
    // data pointer.
    //
    CMPIMsgFileHandle getNewHandle(MessageLoaderParms* data);

    //
    // Returns the data pointer associated to handle.
    // Throws IndexOutOfBoundsException for unused or invalid handles.
    //
    MessageLoaderParms* getDataForHandle(CMPIMsgFileHandle handle);

    //
    // Releases the given handle, marking it as unused.
    // Throws IndexOutOfBoundsException for unused or invalid handles.
    // Note: This method does not release any storage. It is the callers
    //       responsibility to release the memory behind the data pointer
    //       returned by this method.
    //
    MessageLoaderParms* releaseHandle(CMPIMsgFileHandle handle);

private:

    CMPIMsgHandleManager();

    static CMPIMsgHandleManager* _handleManagerInstance;

    // auto-initialisation due to being on the stack
    Array<MessageLoaderParms*> handleTable;

    // Semaphore to protect the handle array from concurrent updates and
    // to serialize the creation of the singleton instance
    static ReadWriteSem _rwsemHandleTable;

};

PEGASUS_NAMESPACE_END

#endif