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

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

#include <lladd/logger/logWriter.h>
#include <lladd/bufferManager.h>
#include <assert.h>

Operation operationsTable[MAX_OPERATIONS];

void doUpdate(const LogEntry * e) {

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

  operationsTable[e->contents.update.funcID].run(e->xid, 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);
#ifdef DEBUGGING
    recordid rid = e->contents.update.rid;
#endif
    if(e->LSN > pageLSN) {
      DEBUG("OPERATION Redo, %ld > %ld {%d %d %d}\n", e->LSN, pageLSN, rid.page, rid.slot, rid.size);
      doUpdate(e);
    } else {
      DEBUG("OPERATION Skipping redo, %ld <= %ld {%d %d %d}\n", e->LSN, pageLSN, rid.page, rid.slot, rid.size);
    }
  } else if(e->type == CLRLOG) {
    LogEntry * f = readLSNEntry(e->contents.clr.thisUpdateLSN);
#ifdef DEBUGGING
    recordid rid = f->contents.update.rid;
#endif
    /* 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 > readLSN(e->contents.update.rid.page)) {

      DEBUG("OPERATION Undoing for clr, %ld {%d %d %d}\n", f->LSN, rid.page, rid.slot, rid.size);
      undoUpdate(f, e->LSN);
    } else {
      DEBUG("OPERATION Skiping undo for clr, %ld {%d %d %d}\n", f->LSN, rid.page, rid.slot, rid.size);
    }
  } else {
    assert(0);
  }

}


void undoUpdate(const LogEntry * e, 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);
  if(e->LSN <= page_lsn) {

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

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

}