// package-private
void drop(MembershipKeyImpl key) {
assert key.channel() == this;
synchronized (stateLock) {
if (!key.isValid()) return;
try {
if (key instanceof MembershipKeyImpl.Type6) {
MembershipKeyImpl.Type6 key6 = (MembershipKeyImpl.Type6) key;
Net.drop6(fd, key6.groupAddress(), key6.index(), key6.source());
} else {
MembershipKeyImpl.Type4 key4 = (MembershipKeyImpl.Type4) key;
Net.drop4(fd, key4.groupAddress(), key4.interfaceAddress(), key4.source());
}
} catch (IOException ioe) {
// should not happen
throw new AssertionError(ioe);
}
key.invalidate();
registry.remove(key);
}
}