/**
* Apply the undo operation, in this implementation of the RawStore, it can only call the undoMe
* method of undoOp
*
* @param xact the Transaction that is doing the rollback
* @param instant the log instant of this undo operation
* @param in optional data
* @exception IOException Can be thrown by any of the methods of ObjectInput.
* @exception StandardException Standard Derby policy.
*/
public final void doMe(Transaction xact, LogInstant instant, LimitObjectInput in)
throws StandardException, IOException {
long oldversion = 0; // sanity check
LogInstant oldLogInstant = null; // sanity check
if (SanityManager.DEBUG) {
oldLogInstant = this.page.getLastLogInstant();
oldversion = this.page.getPageVersion();
SanityManager.ASSERT(oldversion == this.getPageVersion());
SanityManager.ASSERT(
oldLogInstant == null || instant == null || oldLogInstant.lessThan(instant));
}
// if this is called during runtime rollback, PageOp.generateUndo found
// the page and have it latched there.
// if this is called during recovery redo, this.needsRedo found the page and
// have it latched here
//
// in either case, this.page is the correct page and is latched.
//
// recordId is generated by generateUndo and is stored here. If this
// is a physical undo, recordId is identical to that which is stored in
// undoOp. If this is logical undo, it will be different if this.page
// is different from the undoOp's page (which is where the rollfoward
// change went to, and the record might have moved by now).
//
undoOp.undoMe(xact, this.page, recordId, instant, in);
if (SanityManager.DEBUG) {
SanityManager.ASSERT(oldversion < this.page.getPageVersion());
SanityManager.ASSERT(instant == null || instant.equals(this.page.getLastLogInstant()));
}
releaseResource(xact);
}
