@Test
public void verifySendMulticastWithAcks() throws Exception {
MulticastSocket socket;
try {
socket = new MulticastSocket();
} catch (Exception e) {
return;
}
final int testPort = socket.getLocalPort();
final AtomicInteger ackPort = new AtomicInteger();
final String multicastAddress = "225.6.7.8";
final String payload = "foobar";
final CountDownLatch listening = new CountDownLatch(2);
final CountDownLatch ackListening = new CountDownLatch(1);
final CountDownLatch ackSent = new CountDownLatch(2);
Runnable catcher =
new Runnable() {
@Override
public void run() {
try {
byte[] buffer = new byte[1000];
DatagramPacket receivedPacket = new DatagramPacket(buffer, buffer.length);
MulticastSocket socket = new MulticastSocket(testPort);
socket.setInterface(InetAddress.getByName(multicastRule.getNic()));
socket.setSoTimeout(8000);
InetAddress group = InetAddress.getByName(multicastAddress);
socket.joinGroup(group);
listening.countDown();
assertTrue(ackListening.await(10, TimeUnit.SECONDS));
LogFactory.getLog(getClass())
.debug(Thread.currentThread().getName() + " waiting for packet");
socket.receive(receivedPacket);
socket.close();
byte[] src = receivedPacket.getData();
int length = receivedPacket.getLength();
int offset = receivedPacket.getOffset();
byte[] dest = new byte[6];
System.arraycopy(src, offset + length - 6, dest, 0, 6);
assertEquals(payload, new String(dest));
LogFactory.getLog(getClass())
.debug(Thread.currentThread().getName() + " received packet");
DatagramPacketMessageMapper mapper = new DatagramPacketMessageMapper();
mapper.setAcknowledge(true);
mapper.setLengthCheck(true);
Message<byte[]> message = mapper.toMessage(receivedPacket);
Object id = message.getHeaders().get(IpHeaders.ACK_ID);
byte[] ack = id.toString().getBytes();
DatagramPacket ackPack =
new DatagramPacket(
ack,
ack.length,
new InetSocketAddress(multicastRule.getNic(), ackPort.get()));
DatagramSocket out = new DatagramSocket();
out.send(ackPack);
LogFactory.getLog(getClass())
.debug(
Thread.currentThread().getName()
+ " sent ack to "
+ ackPack.getSocketAddress());
out.close();
ackSent.countDown();
socket.close();
} catch (Exception e) {
listening.countDown();
e.printStackTrace();
}
}
};
Executor executor = Executors.newFixedThreadPool(2);
executor.execute(catcher);
executor.execute(catcher);
assertTrue(listening.await(10000, TimeUnit.MILLISECONDS));
MulticastSendingMessageHandler handler =
new MulticastSendingMessageHandler(
multicastAddress, testPort, true, true, "localhost", 0, 10000);
handler.setLocalAddress(this.multicastRule.getNic());
handler.setMinAcksForSuccess(2);
handler.afterPropertiesSet();
handler.start();
waitAckListening(handler);
ackPort.set(handler.getAckPort());
ackListening.countDown();
handler.handleMessage(MessageBuilder.withPayload(payload).build());
assertTrue(ackSent.await(10000, TimeUnit.MILLISECONDS));
handler.stop();
socket.close();
}
