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

/*---
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---*/
#include <lladd/operations.h>

#include <lladd/logger/logger2.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;
    lsn_t pageLSN;
    try {
      if(operationsTable[e->contents.update.funcID].sizeofData == SIZEIS_PAGEID) {
	p = NULL;
	pageLSN = 0;
      } else {
	p = loadPage(e->xid, rid.page);
	pageLSN = pageReadLSN(p);
      } 
    } end;

    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);
      // Need to check the id field to find out what the _REDO_ action is for this log type.
      // contrast with doUpdate(), which doesn't use the .id field. 
      operationsTable[operationsTable[e->contents.update.funcID].id]
	.run(e->xid, p, e->LSN, e->contents.update.rid, getUpdateArgs(e));

    } else {
      DEBUG("OPERATION Skipping redo, %ld <= %ld {%d %d %ld}\n", e->LSN, pageLSN, rid.page, rid.slot, rid.size);
    }
    if(p) { 
      releasePage(p);
    }
  } else if(e->type == CLRLOG) {
    const LogEntry * f = LogReadLSN(e->contents.clr.thisUpdateLSN);
    recordid rid = f->contents.update.rid;
    Page * p = NULL;
    lsn_t pageLSN;

    int isNullRid = !memcmp(&rid, &NULLRID, sizeof(recordid));
    if(!isNullRid) {
      if(operationsTable[f->contents.update.funcID].sizeofData == SIZEIS_PAGEID) { 
	p = NULL;
	pageLSN = 0;
      } else { 
	try { 
	  p = loadPage(e->xid, rid.page);
	  pageLSN = pageReadLSN(p);
	} end;
      }
    }
    //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, or this was a logical
       operation, then undo the original operation. */


    if(isNullRid || f->LSN > pageLSN) {

      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);
    }
    if(p) { 
      releasePage(p);
    }
    FreeLogEntry(f); 
  } 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 = -1;
  if(p) {
    page_lsn = pageReadLSN(p);
  }
  if(e->LSN <= page_lsn || !p) {

    /* Actually execute the undo */
    if(undo == NO_INVERSE) {
      /* Physical undo */
      assert(p);  // Must be provided wiht a page in order to perform a physical undo!
      DEBUG("OPERATION %d Physical undo, %ld {%d %d %ld}\n", undo, e->LSN, e->contents.update.rid.page, e->contents.update.rid.slot, e->contents.update.rid.size);
      writeRecord(e->xid, p, clr_lsn, e->contents.update.rid, getUpdatePreImage(e));
    } else if(undo == NO_INVERSE_WHOLE_PAGE) {
      assert(p);
      DEBUG("OPERATION %d Whole page physical undo, %ld {%d}\n", undo, e->LSN, e->contents.update.rid.page);
      memcpy(p->memAddr, getUpdatePreImage(e), PAGE_SIZE);
      pageWriteLSN(e->xid, p, clr_lsn);

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

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

}