@Override
                            public CompletableFuture<Void> onConnectionClosing(@Nullable Object handback) {
                                return CompletableFuture.runAsync(() -> InternalComponentManager.getInstance().removeComponent(subdomain, (ComponentSession.ExternalComponent) handback));
                            }
Handler of XML stanzas sent by external components connected directly to the server. Received packet will
have their FROM attribute overridden to avoid spoofing.<p>

This is an implementation of the XEP-114.

@author Gaston Dombiak
xmppserver/src/main/java/org/jivesoftware/openfire/net/ComponentStanzaHandler.java