/**
* return the current version of the provided reader, whether or not it is visible or staged; i.e.
* returns the first version present by testing staged, logged and originals in order.
*/
public SSTableReader current(SSTableReader reader) {
Set<SSTableReader> container;
if (staged.contains(reader))
container = staged.update.contains(reader) ? staged.update : staged.obsolete;
else if (logged.contains(reader))
container = logged.update.contains(reader) ? logged.update : logged.obsolete;
else if (originals.contains(reader)) container = originals;
else throw new AssertionError();
return select(reader, container);
}
/** remove the reader from the set we're modifying */
public void cancel(SSTableReader cancel) {
logger.debug("Cancelling {} from transaction", cancel);
assert originals.contains(cancel)
: "may only cancel a reader in the 'original' set: " + cancel + " vs " + originals;
assert !(staged.contains(cancel) || logged.contains(cancel))
: "may only cancel a reader that has not been updated or obsoleted in this transaction: "
+ cancel;
originals.remove(cancel);
marked.remove(cancel);
maybeFail(unmarkCompacting(singleton(cancel), null));
}