@BIF
public static EObject monitor(EProc self, EObject how, EObject object) throws Pausable {
if (how != am_process) throw ERT.badarg(how, object);
// case 1: object is a PID
EHandle h = EHandle.cast(object);
if (h != null) {
ERef ref = ERT.getLocalNode().createRef();
if (!self.monitor(h, h, ref)) {
self.mbox_send(ETuple.make(ERT.am_DOWN, ref, am_process, object, ERT.am_noproc));
}
return ref;
}
// case 2: object is a name
EAtom name;
if (h == null && (name = object.testAtom()) != null) {
ERef ref = ERT.getLocalNode().createRef();
boolean success = false;
object = new ETuple2(name, ErlDist.node());
if ((h = ERT.whereis(name).testHandle()) != null) {
success = self.monitor(h, object, ref);
}
if (!success) {
self.mbox_send(ETuple.make(ERT.am_DOWN, ref, am_process, object, ERT.am_noproc));
}
return ref;
}
// case 3: object is {name, node}
ETuple tup;
EAtom node;
if ((tup = object.testTuple()) != null
&& tup.arity() == 2
&& (name = tup.elm(1).testAtom()) != null
&& (node = tup.elm(2).testAtom()) != null) {
if (node == ErlDist.node()) {
ERef ref = ERT.getLocalNode().createRef();
boolean success = false;
if ((h = ERT.whereis(name).testHandle()) != null) {
success = self.monitor(h, object, ref);
}
if (!success) {
self.mbox_send(ETuple.make(ERT.am_DOWN, ref, am_process, object, ERT.am_noproc));
}
return ref;
} else {
EPeer peer = (EPeer) EPeer.get(node);
if (peer != null) {
ERef ref = ERT.getLocalNode().createRef();
self.monitor(tup, ref);
peer.dsig_monitor(self.self_handle(), name, ref);
return ref;
}
return ErlDist.dmonitor_p2_trap.invoke(self, new EObject[] {how, object});
}
}
throw ERT.badarg(how, object);
}
