// Write-lock 'this', delete any old thing, returns NEW guy
public T delete_and_lock(Key job_key) {
Lockable old = write_lock(job_key);
if (old != null) {
Log.debug(Log.Tag.Sys.LOCKS, "lock-then-clear " + _key + " by job " + job_key);
old.delete_impl(new Futures()).blockForPending();
}
return (T) this;
}
// Will fail if locked by anybody other than 'job_key'
public void delete(Key job_key, float dummy) {
if (_key != null) {
Log.debug(Log.Tag.Sys.LOCKS, "lock-then-delete " + _key + " by job " + job_key);
new PriorWriteLock(job_key).invoke(_key);
}
Futures fs = new Futures();
delete_impl(fs);
if (_key != null) DKV.remove(_key, fs); // Delete self also
fs.blockForPending();
}