@Override
    public Link getLink(ConnectPoint src, ConnectPoint dst) {
        return links.get(linkKey(src, dst));
    }
@Test
    public final void testGetLink() {
        ConnectPoint src = new ConnectPoint(DID1, P1);
        ConnectPoint dst = new ConnectPoint(DID2, P2);
        LinkKey linkId1 = LinkKey.linkKey(src, dst);

        putLink(linkId1, DIRECT);

        Link link = linkStore.getLink(src, dst);
        assertLink(linkId1, DIRECT, link);

        assertNull("There shouldn't be reverese link",
                linkStore.getLink(dst, src));
    }