/**
* update a reader: if !original, this is a reader that is being introduced by this transaction;
* otherwise it must be in the originals() set, i.e. a reader guarded by this transaction
*/
public void update(SSTableReader reader, boolean original) {
assert !staged.update.contains(reader)
: "each reader may only be updated once per checkpoint: " + reader;
assert !identities.contains(reader.instanceId)
: "each reader instance may only be provided as an update once: " + reader;
// check it isn't obsolete, and that it matches the original flag
assert !(logged.obsolete.contains(reader) || staged.obsolete.contains(reader))
: "may not update a reader that has been obsoleted";
assert original == originals.contains(reader)
: String.format(
"the 'original' indicator was incorrect (%s provided): %s", original, reader);
staged.update.add(reader);
identities.add(reader.instanceId);
if (!isOffline()) reader.setupKeyCache();
}
