// Received an ACK
@Override
public void onAck() {
// remove local cache but NOT in case it is already on disk
// (ie memory can be reclaimed and we assume we have plenty of disk space)
if (_dontCache && !_xval.isPersisted()) H2O.putIfMatch(_xkey, null, _xval);
if (_xval != null) _xval.completeRemotePut();
}
@Override
public void dinvoke(H2ONode sender) {
assert _key.home()
|| _val == null; // Only PUT to home for keys, or remote invalidation from home
Paxos.lockCloud();
// Initialize Value for having a single known replica (the sender)
if (_val != null) _val.initReplicaHome(sender, _key);
// Spin, until we update something.
Value old = H2O.raw_get(_key); // Raw-get: do not lazy-manifest if overwriting
while (H2O.putIfMatch(_key, _val, old) != old)
old = H2O.raw_get(_key); // Repeat until we update something.
// Invalidate remote caches. Block, so that all invalidates are done
// before we return to the remote caller.
if (_key.home() && old != null) old.lockAndInvalidate(sender, new Futures()).blockForPending();
// No return result
_key = null;
_val = null;
tryComplete();
}
// Received an ACK; executes on the node asking&receiving the Value
@Override
public void onAck() {
if (_val != null) { // Set transient fields after deserializing
assert !_xkey.home() && _val._key == null;
_val._key = _xkey;
}
// Now update the local store, caching the result.
// We only started down the TGK path because we missed locally, so we only
// expect to find a NULL in the local store. If somebody else installed
// another value (e.g. a racing TGK, or racing local Put) this value must
// be more recent than our NULL - but is UNORDERED relative to the Value
// returned from the Home. We'll take the local Value to preserve ordering
// and rely on invalidates from Home to force refreshes as needed.
// Hence we can do a blind putIfMatch here over a null or empty Value
// If it fails, what is there is also the TGK result.
Value old = H2O.STORE.get(_xkey);
if (old != null && !old.isEmpty()) old = null;
Value res = H2O.putIfMatch(_xkey, _val, old);
if (res != old) _val = res;
TGKS.remove(_xkey); // Clear from dup cache
}
