@Override
public Lockable atomic(Lockable old) {
_old = old;
if (old != null) { // Prior Lockable exists?
assert !old.is_wlocked(_job_key)
: "Key "
+ _key
+ " already locked; lks="
+ Arrays.toString(old._lockers); // No double locking by same job
if (old.is_locked(_job_key)) // read-locked by self? (double-write-lock checked above)
old.set_unlocked(
old._lockers, _job_key); // Remove read-lock; will atomically upgrade to write-lock
if (!old.is_unlocked()) // Blocking for some other Job to finish???
throw new IllegalArgumentException(
old.errStr()
+ " "
+ _key
+ " is already in use. Unable to use it now. Consider using a different destination name.");
assert old.is_unlocked()
: "Not unlocked when locking " + Arrays.toString(old._lockers) + " for " + _job_key;
}
// Update & set the new value
set_write_lock(_job_key);
return Lockable.this;
}
@Override
public Lockable atomic(Lockable old) {
if (old == null) throw new IllegalArgumentException("Nothing to lock!");
if (old.is_wlocked())
throw new IllegalArgumentException(
old.errStr() + " " + _key + " is being created; Unable to read it now.");
old.set_read_lock(_job_key);
return old;
}
@Override
public Lockable atomic(Lockable old) {
assert old != null && old.is_wlocked();
_lockers = old._lockers; // Keep lock state
return Lockable.this; // Freshen this
}