/*-------------------------------------------------------------------------
 *
 * stats.c--
 *    heap access method debugging statistic collection routines
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 *
 * IDENTIFICATION
 *    $Header: /cvsroot/pgsql/src/backend/access/heap/Attic/stats.c,v 1.6 1996/11/03 12:34:55 scrappy Exp $
 *
 * NOTES
 *    initam should be moved someplace else.
 *
 *-------------------------------------------------------------------------
 */

#include <stdio.h>

#include "postgres.h"

#include "access/relscan.h"

#include "access/heapam.h"

#include "nodes/memnodes.h"

#include "utils/mcxt.h"

#include "utils/palloc.h"

#ifndef HAVE_MEMMOVE
# include "regex/utils.h"
#else
# include <string.h>
#endif

/* ----------------
 *      InitHeapAccessStatistics
 * ----------------
 */
HeapAccessStatistics heap_access_stats = (HeapAccessStatistics) NULL;
     
void
InitHeapAccessStatistics()    
{
    MemoryContext    oldContext;
    HeapAccessStatistics stats;
    
    /* ----------------
     *  make sure we don't initialize things twice
     * ----------------
     */
    if (heap_access_stats != NULL)
        return;
    
    /* ----------------
     *  allocate statistics structure from the top memory context
     * ----------------
     */
    oldContext = MemoryContextSwitchTo(TopMemoryContext);
    
    stats = (HeapAccessStatistics)
        palloc(sizeof(HeapAccessStatisticsData));
    
    /* ----------------
     *  initialize fields to default values
     * ----------------
     */
    stats->global_open = 0;			
    stats->global_openr = 0;
    stats->global_close = 0;
    stats->global_beginscan = 0;
    stats->global_rescan = 0;
    stats->global_endscan = 0;
    stats->global_getnext = 0;
    stats->global_fetch = 0;
    stats->global_insert = 0;
    stats->global_delete = 0;
    stats->global_replace = 0;
    stats->global_markpos = 0;
    stats->global_restrpos = 0;
    stats->global_BufferGetRelation = 0;
    stats->global_RelationIdGetRelation = 0;
    stats->global_RelationIdGetRelation_Buf = 0;
    stats->global_getreldesc = 0;
    stats->global_heapgettup = 0;
    stats->global_RelationPutHeapTuple = 0;
    stats->global_RelationPutLongHeapTuple = 0;
    
    stats->local_open = 0;
    stats->local_openr = 0;
    stats->local_close = 0;
    stats->local_beginscan = 0;
    stats->local_rescan = 0;
    stats->local_endscan = 0;
    stats->local_getnext = 0;
    stats->local_fetch = 0;
    stats->local_insert = 0;
    stats->local_delete = 0;
    stats->local_replace = 0;
    stats->local_markpos = 0;
    stats->local_restrpos = 0;
    stats->local_BufferGetRelation = 0;
    stats->local_RelationIdGetRelation = 0;
    stats->local_RelationIdGetRelation_Buf = 0;
    stats->local_getreldesc = 0;
    stats->local_heapgettup = 0;
    stats->local_RelationPutHeapTuple = 0;
    stats->local_RelationPutLongHeapTuple = 0;
    stats->local_RelationNameGetRelation = 0;
    stats->global_RelationNameGetRelation = 0;
    
    /* ----------------
     *  record init times
     * ----------------
     */
    time(&stats->init_global_timestamp);
    time(&stats->local_reset_timestamp);
    time(&stats->last_request_timestamp);
    
    /* ----------------
     *  return to old memory context
     * ----------------
     */
    (void) MemoryContextSwitchTo(oldContext);
    
    heap_access_stats = stats;
}

/* ----------------
 *      ResetHeapAccessStatistics
 * ----------------
 */
void
ResetHeapAccessStatistics()    
{
    HeapAccessStatistics stats;
    
    /* ----------------
     *  do nothing if stats aren't initialized
     * ----------------
     */
    if (heap_access_stats == NULL)
        return;
    
    stats = heap_access_stats;
    
    /* ----------------
     *  reset local counts
     * ----------------
     */
    stats->local_open = 0;
    stats->local_openr = 0;
    stats->local_close = 0;
    stats->local_beginscan = 0;
    stats->local_rescan = 0;
    stats->local_endscan = 0;
    stats->local_getnext = 0;
    stats->local_fetch = 0;
    stats->local_insert = 0;
    stats->local_delete = 0;
    stats->local_replace = 0;
    stats->local_markpos = 0;
    stats->local_restrpos = 0;
    stats->local_BufferGetRelation = 0;
    stats->local_RelationIdGetRelation = 0;
    stats->local_RelationIdGetRelation_Buf = 0;
    stats->local_getreldesc = 0;
    stats->local_heapgettup = 0;
    stats->local_RelationPutHeapTuple = 0;
    stats->local_RelationPutLongHeapTuple = 0;
    
    /* ----------------
     *  reset local timestamps
     * ----------------
     */
    time(&stats->local_reset_timestamp);
    time(&stats->last_request_timestamp);
}

/* ----------------
 *      GetHeapAccessStatistics
 * ----------------
 */
HeapAccessStatistics GetHeapAccessStatistics()    
{
    HeapAccessStatistics stats;
    
    /* ----------------
     *  return nothing if stats aren't initialized
     * ----------------
     */
    if (heap_access_stats == NULL)
        return NULL;
    
    /* ----------------
     *  record the current request time
     * ----------------
     */
    time(&heap_access_stats->last_request_timestamp);
    
    /* ----------------
     *  allocate a copy of the stats and return it to the caller.
     * ----------------
     */
    stats = (HeapAccessStatistics)
        palloc(sizeof(HeapAccessStatisticsData));
    
     memmove(stats,
	     heap_access_stats,
	     sizeof(HeapAccessStatisticsData)); 
    
    return stats;
}

/* ----------------
 *      PrintHeapAccessStatistics
 * ----------------
 */
void
PrintHeapAccessStatistics(HeapAccessStatistics stats)
{
    /* ----------------
     *  return nothing if stats aren't valid
     * ----------------
     */
    if (stats == NULL)
        return;
    
    printf("======== heap am statistics ========\n");
    printf("init_global_timestamp:      %s",
           ctime(&(stats->init_global_timestamp)));
    
    printf("local_reset_timestamp:      %s",
           ctime(&(stats->local_reset_timestamp)));
    
    printf("last_request_timestamp:     %s",
           ctime(&(stats->last_request_timestamp)));
    
    printf("local/global_open:                        %6d/%6d\n",
           stats->local_open, stats->global_open);
    
    printf("local/global_openr:                       %6d/%6d\n",
           stats->local_openr, stats->global_openr);
    
    printf("local/global_close:                       %6d/%6d\n",
           stats->local_close, stats->global_close);
    
    printf("local/global_beginscan:                   %6d/%6d\n",
           stats->local_beginscan, stats->global_beginscan);
    
    printf("local/global_rescan:                      %6d/%6d\n",
           stats->local_rescan, stats->global_rescan);
    
    printf("local/global_endscan:                     %6d/%6d\n",
           stats->local_endscan, stats->global_endscan);
    
    printf("local/global_getnext:                     %6d/%6d\n",
           stats->local_getnext, stats->global_getnext);
    
    printf("local/global_fetch:                       %6d/%6d\n",
           stats->local_fetch, stats->global_fetch);
    
    printf("local/global_insert:                      %6d/%6d\n",
           stats->local_insert, stats->global_insert);
    
    printf("local/global_delete:                      %6d/%6d\n",
           stats->local_delete, stats->global_delete);
    
    printf("local/global_replace:                     %6d/%6d\n",
           stats->local_replace, stats->global_replace);
    
    printf("local/global_markpos:                     %6d/%6d\n",
           stats->local_markpos, stats->global_markpos);
    
    printf("local/global_restrpos:                    %6d/%6d\n",
           stats->local_restrpos, stats->global_restrpos);
    
    printf("================\n");
    
    printf("local/global_BufferGetRelation:             %6d/%6d\n",
           stats->local_BufferGetRelation,
           stats->global_BufferGetRelation);
    
    printf("local/global_RelationIdGetRelation:         %6d/%6d\n",
           stats->local_RelationIdGetRelation,
           stats->global_RelationIdGetRelation);
    
    printf("local/global_RelationIdGetRelation_Buf:     %6d/%6d\n",
           stats->local_RelationIdGetRelation_Buf,
           stats->global_RelationIdGetRelation_Buf);
    
    printf("local/global_getreldesc:                    %6d/%6d\n",
           stats->local_getreldesc, stats->global_getreldesc);
    
    printf("local/global_heapgettup:                    %6d/%6d\n",
           stats->local_heapgettup, stats->global_heapgettup);
    
    printf("local/global_RelationPutHeapTuple:          %6d/%6d\n",
           stats->local_RelationPutHeapTuple,
           stats->global_RelationPutHeapTuple);
    
    printf("local/global_RelationPutLongHeapTuple:      %6d/%6d\n",
           stats->local_RelationPutLongHeapTuple,
           stats->global_RelationPutLongHeapTuple);
    
    printf("===================================\n");
    
    printf("\n");
}

/* ----------------
 *      PrintAndFreeHeapAccessStatistics
 * ----------------
 */
void
PrintAndFreeHeapAccessStatistics(HeapAccessStatistics stats)
{
    PrintHeapAccessStatistics(stats);
    if (stats != NULL)
	pfree(stats);
}

/* ----------------------------------------------------------------
 *		    access method initialization
 * ----------------------------------------------------------------
 */
/* ----------------
 *	initam should someday be moved someplace else.
 * ----------------
 */
void
initam()
{
    /* ----------------
     *	initialize heap statistics.
     * ----------------
     */
    InitHeapAccessStatistics();
}
