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

/*---
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---*/
#include <config.h>
#include <stasis/common.h>

#include <assert.h>
#include <string.h>
#include <stdio.h>

#include <stasis/operations.h>
#include <stasis/logger/logger2.h>
#include <stasis/bufferManager.h>

#include <stasis/page.h>

#include <stasis/transactional.h> /// XXX for xactiontable

Operation operationsTable[MAX_OPERATIONS];

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


  operationsTable[e->update.funcID].run(e, p);

  writelock(p->rwlatch,0);
  DEBUG("OPERATION xid %d Do, %lld {%lld:%lld}\n", e->xid,
         e->LSN, e->update.page, stasis_page_lsn_read(p));

  stasis_page_lsn_write(e->xid, p, e->LSN);
  unlock(p->rwlatch);

}

void redoUpdate(const LogEntry * e) {
  // Only handle update log entries
  assert(e->type == UPDATELOG);
  // If this is a logical operation, something is broken
  assert(e->update.page != INVALID_PAGE);

  if(operationsTable[operationsTable[e->update.funcID].id].run == noop) 
    return;

  Page * p = loadPage(e->xid, e->update.page);
  writelock(p->rwlatch,0);
  if(stasis_page_lsn_read(p) < e->LSN) {
    DEBUG("OPERATION xid %d Redo, %lld {%lld:%lld}\n", e->xid,
           e->LSN, e->update.page, stasis_page_lsn_read(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 check the .id field.
    stasis_page_lsn_write(e->xid, p, e->LSN); //XXX do this after run();
    unlock(p->rwlatch); /// XXX keep lock while calling run();

    operationsTable[operationsTable[e->update.funcID].id]
      .run(e,p);
  } else {
    DEBUG("OPERATION xid %d skip redo, %lld {%lld:%lld}\n", e->xid,
           e->LSN, e->update.page, stasis_page_lsn_read(p));
    unlock(p->rwlatch);
  }
  releasePage(p);
}

void undoUpdate(const LogEntry * e, lsn_t effective_lsn) {
  // Only handle update entries
  assert(e->type == UPDATELOG);

  int undo = operationsTable[e->update.funcID].undo;

  if(e->update.page == INVALID_PAGE) {
    // logical undos are excuted unconditionally.

    DEBUG("OPERATION xid %d FuncID %d Undo, %d LSN %lld {logical}\n", e->xid,
          e->update.funcID, undo, e->LSN);

    operationsTable[undo].run(e,0);
  } else {
    Page * p = loadPage(e->xid, e->update.page);
    writelock(p->rwlatch,0);
    if(stasis_page_lsn_read(p) < effective_lsn) {
      DEBUG("OPERATION xid %d Undo, %lld {%lld:%lld}\n", e->xid,
             e->LSN, e->update.page, stasis_page_lsn_read(p));
      stasis_page_lsn_write(e->xid, p, effective_lsn); // XXX call after run()
      unlock(p->rwlatch);  // release after run()
      operationsTable[undo].run(e,p);
    } else {
      DEBUG("OPERATION xid %d skip undo, %lld {%lld:%lld}\n", e->xid,
             e->LSN, e->update.page, stasis_page_lsn_read(p));
      unlock(p->rwlatch);
    }
    releasePage(p);
  }
}