stasis-aries-wal/src/lladd/operations.c

/*---
This software is copyrighted by the Regents of the University of
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---*/
#include <lladd/operations.h>

#include "logger/logWriter.h"
#include <lladd/bufferManager.h>
#include <assert.h>
#include <string.h>
/** @todo questionable include */
#include "page.h"

#include <stdio.h>

Operation operationsTable[MAX_OPERATIONS];

void doUpdate(const LogEntry * e, Page * p) {


  DEBUG("OPERATION update arg length %d, lsn = %ld\n", e->contents.update.argSize, e->LSN);

  operationsTable[e->contents.update.funcID].run(e->xid, p, e->LSN, e->contents.update.rid, getUpdateArgs(e));

}

void redoUpdate(const LogEntry * e) {
  if(e->type == UPDATELOG) {
    /*    lsn_t pageLSN = readLSN(e->contents.update.rid.page); */
    recordid rid = e->contents.update.rid;
    Page * p = loadPage(rid.page);
    lsn_t pageLSN = pageReadLSN(p);

    if(e->LSN > pageLSN) {
      DEBUG("OPERATION Redo, %ld > %ld {%d %d %ld}\n", e->LSN, pageLSN, rid.page, rid.slot, rid.size);
      doUpdate(e, p);
    } else {
      DEBUG("OPERATION Skipping redo, %ld <= %ld {%d %d %ld}\n", e->LSN, pageLSN, rid.page, rid.slot, rid.size);
    }

    releasePage(p);
  } else if(e->type == CLRLOG) {
    LogEntry * f = readLSNEntry(e->contents.clr.thisUpdateLSN);
    recordid rid = f->contents.update.rid;
    Page * p = loadPage(rid.page);

    assert(rid.page == e->contents.update.rid.page); /* @todo Should this always hold? */

    /* See if the page contains the result of the undo that this CLR is supposed to perform. If it
       doesn't, then undo the original operation. */
    /*    if(f->LSN > pageReadLSN(e->contents.update.rid.page)) { */
    if(f->LSN > pageReadLSN(p)) {

      DEBUG("OPERATION Undoing for clr, %ld {%d %d %ld}\n", f->LSN, rid.page, rid.slot, rid.size);
      undoUpdate(f, p, e->LSN);
    } else {
      DEBUG("OPERATION Skiping undo for clr, %ld {%d %d %ld}\n", f->LSN, rid.page, rid.slot, rid.size);
    }

    releasePage(p);
  } else {
    assert(0);
  }

}


void undoUpdate(const LogEntry * e, Page * p, lsn_t clr_lsn) {

  int undo = operationsTable[e->contents.update.funcID].undo;
  DEBUG("OPERATION FuncID %d Undo op %d LSN %ld\n",e->contents.update.funcID, undo, clr_lsn);

#ifdef DEBUGGING
  recordid rid = e->contents.update.rid;
#endif
  /*  lsn_t page_lsn = readLSN(e->contents.update.rid.page); */
  lsn_t page_lsn = pageReadLSN(p);
  if(e->LSN <= page_lsn) {

    /* Actually execute the undo */
    if(undo == NO_INVERSE) {
      /* Physical undo */

      DEBUG("OPERATION Physical undo, %ld {%d %d %ld}\n", e->LSN, rid.page, rid.slot, rid.size);
      writeRecord(e->xid, p, clr_lsn, e->contents.update.rid, getUpdatePreImage(e));
    } else if(undo == NO_INVERSE_WHOLE_PAGE) {
      DEBUG("OPERATION Whole page physical undo, %ld {%d}\n", e->LSN, rid.page);
      memcpy(p->memAddr, getUpdatePreImage(e), PAGE_SIZE);
      pageWriteLSN(p, clr_lsn);

    } else {
      /* @see doUpdate() */
      /*      printf("Logical undo"); fflush(NULL); */
      DEBUG("OPERATION Logical undo, %ld {%d %d %ld}\n", e->LSN, rid.page, rid.slot, rid.size);
      operationsTable[undo].run(e->xid, p, clr_lsn, e->contents.update.rid, getUpdateArgs(e));
    }
  } else {
    DEBUG("OPERATION Skipping undo, %ld {%d %d %ld}\n", e->LSN, rid.page, rid.slot, rid.size);
  }

  /*  printf("Undo done."); fflush(NULL); */

}