/*************************************************************************\
* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
*     National Laboratory.
* Copyright (c) 2002 The Regents of the University of California, as
*     Operator of Los Alamos National Laboratory.
* EPICS BASE Versions 3.13.7
* and higher are distributed subject to a Software License Agreement found
* in file LICENSE that is included with this distribution. 
\*************************************************************************/

/*  
 *  Revision-Id: anj@aps.anl.gov-20101005192737-disfz3vs0f3fiixd
 *
 *                              
 *                    L O S  A L A M O S
 *              Los Alamos National Laboratory
 *               Los Alamos, New Mexico 87545
 *                                  
 *  Copyright, 1986, The Regents of the University of California.
 *                                  
 *           
 *	Author Jeffrey O. Hill
 *	johill@lanl.gov
 *	505 665 1831
 */

#ifndef dbPutNotifyBlockerh
#define dbPutNotifyBlockerh

#ifdef epicsExportSharedSymbols
#define dbPutNotifyBlockerh_restore_epicsExportSharedSymbols
#undef epicsExportSharedSymbols
#endif

#include "tsFreeList.h"
#include "compilerDependencies.h"

#ifdef dbPutNotifyBlockerh_restore_epicsExportSharedSymbols
#define epicsExportSharedSymbols
#endif

class dbPutNotifyBlocker : public dbBaseIO {
public:
    dbPutNotifyBlocker ( epicsMutex & );
    void destructor ( epicsGuard < epicsMutex > & );
    void initiatePutNotify ( epicsGuard < epicsMutex > &, 
            cacWriteNotify &, struct dbAddr &, 
            unsigned type, unsigned long count, const void * pValue );
    void cancel ( epicsGuard < epicsMutex > & );
    void show ( epicsGuard < epicsMutex > &, unsigned level ) const;
    void show ( unsigned level ) const;
    void * operator new ( size_t size, 
        tsFreeList < dbPutNotifyBlocker, 64, epicsMutexNOOP > & );
    epicsPlacementDeleteOperator (( void *, 
        tsFreeList < dbPutNotifyBlocker, 64, epicsMutexNOOP > & ))
private:
    putNotify pn;
    //
    // Include a union of all scalar types 
    // including fixed length strings so
    // that in many cases we can avoid 
    // allocating another buffer
    // 
    union {
        dbr_string_t strval;
        dbr_short_t shrtval;
        dbr_short_t intval;
        dbr_float_t fltval;
        dbr_enum_t enmval;
        dbr_char_t charval;
        dbr_long_t longval;
        dbr_double_t doubleval;
    } dbrScalarValue;
    epicsEvent block;
    epicsMutex & mutex;
    cacWriteNotify * pNotify;
    unsigned long maxValueSize;
    dbSubscriptionIO * isSubscription ();
    void expandValueBuf ( 
        epicsGuard < epicsMutex > &, unsigned long newSize );
    friend void putNotifyCompletion ( putNotify * ppn );
	dbPutNotifyBlocker ( const dbPutNotifyBlocker & );
	dbPutNotifyBlocker & operator = ( const dbPutNotifyBlocker & );
    virtual ~dbPutNotifyBlocker ();
    void * operator new ( size_t size );
    void operator delete ( void * );
};

#endif // ifndef dbPutNotifyBlockerh