protected void waitForBridgeView(
int expected_size, long timeout, long interval, JChannel... channels) {
long deadline = System.currentTimeMillis() + timeout;
while (System.currentTimeMillis() < deadline) {
boolean views_correct = true;
for (JChannel ch : channels) {
RELAY2 relay = (RELAY2) ch.getProtocolStack().findProtocol(RELAY2.class);
View bridge_view = relay.getBridgeView(BRIDGE_CLUSTER);
if (bridge_view == null || bridge_view.size() != expected_size) {
views_correct = false;
break;
}
}
if (views_correct) break;
Util.sleep(interval);
}
System.out.println("Bridge views:\n");
for (JChannel ch : channels) {
RELAY2 relay = (RELAY2) ch.getProtocolStack().findProtocol(RELAY2.class);
View bridge_view = relay.getBridgeView(BRIDGE_CLUSTER);
System.out.println(ch.getAddress() + ": " + bridge_view);
}
for (JChannel ch : channels) {
RELAY2 relay = (RELAY2) ch.getProtocolStack().findProtocol(RELAY2.class);
View bridge_view = relay.getBridgeView(BRIDGE_CLUSTER);
assert bridge_view != null && bridge_view.size() == expected_size
: ch.getAddress() + ": bridge view=" + bridge_view + ", expected=" + expected_size;
}
}
public void testRegularUnicastsToOthers() throws Exception {
send(c1, c2.getAddress(), false, 10);
send(c1, c3.getAddress(), false, 10);
sendStableMessages(c1, c2, c3);
check(r2, 1, false, new Tuple<Address, Integer>(a1, 10));
check(r3, 1, false, new Tuple<Address, Integer>(a1, 10));
}
/** Creates a singleton view for each channel listed and injects it */
protected static void createPartition(JChannel... channels) {
for (JChannel ch : channels) {
View view = Util.createView(ch.getAddress(), 5, ch.getAddress());
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
gms.installView(view);
}
}
private void sendMessageToBothChannels(int size) throws Exception {
long start, stop;
d1.setRequestHandler(new MyHandler(new byte[size]));
c2 = createChannel(c1);
c2.setName("B");
disableBundling(c2);
d2 = new MessageDispatcher(c2, null, null, new MyHandler(new byte[size]));
c2.connect("MessageDispatcherUnitTest");
Assert.assertEquals(2, c2.getView().size());
System.out.println("casting message");
start = System.currentTimeMillis();
RspList rsps = d1.castMessage(null, new Message(), new RequestOptions(ResponseMode.GET_ALL, 0));
stop = System.currentTimeMillis();
System.out.println("rsps:\n" + rsps);
System.out.println("call took " + (stop - start) + " ms");
assertNotNull(rsps);
Assert.assertEquals(2, rsps.size());
Rsp rsp = rsps.get(c1.getAddress());
assertNotNull(rsp);
byte[] ret = (byte[]) rsp.getValue();
Assert.assertEquals(size, ret.length);
rsp = rsps.get(c2.getAddress());
assertNotNull(rsp);
ret = (byte[]) rsp.getValue();
Assert.assertEquals(size, ret.length);
Util.close(c2);
}
public void testNullMessageToAll() throws Exception {
d1.setRequestHandler(new MyHandler(null));
c2 = createChannel(c1);
c2.setName("B");
disableBundling(c2);
long stop, start = System.currentTimeMillis();
d2 = new MessageDispatcher(c2, null, null, new MyHandler(null));
stop = System.currentTimeMillis();
c2.connect("MessageDispatcherUnitTest");
Assert.assertEquals(2, c2.getView().size());
System.out.println("view: " + c2.getView());
System.out.println("casting message");
start = System.currentTimeMillis();
RspList rsps = d1.castMessage(null, new Message(), new RequestOptions(ResponseMode.GET_ALL, 0));
stop = System.currentTimeMillis();
System.out.println("rsps:\n" + rsps);
System.out.println("call took " + (stop - start) + " ms");
assertNotNull(rsps);
Assert.assertEquals(2, rsps.size());
Rsp rsp = rsps.get(c1.getAddress());
assertNotNull(rsp);
Object ret = rsp.getValue();
assert ret == null;
rsp = rsps.get(c2.getAddress());
assertNotNull(rsp);
ret = rsp.getValue();
assert ret == null;
Util.close(c2);
}
@Test(invocationCount = 10)
public void testOOBUnicastsToOthers() throws Exception {
send(c1, c2.getAddress(), true, 10);
send(c1, c3.getAddress(), true, 10);
sendStableMessages(c1, c2, c3);
check(r2, 1, true, new Tuple<Address, Integer>(a1, 10));
check(r3, 1, true, new Tuple<Address, Integer>(a1, 10));
}
/**
* Multiple threads (NUM_THREADS) send messages (NUM_MSGS)
*
* @throws Exception
*/
@Test(dataProvider = "provider")
public void testMessageReceptionUnderHighLoad(String props) throws Exception {
CountDownLatch latch = new CountDownLatch(1);
c1 = new JChannel(props);
c2 = new JChannel(props);
MyReceiver r1 = new MyReceiver("c1"), r2 = new MyReceiver("c2");
c1.setReceiver(r1);
c2.setReceiver(r2);
c1.connect("testSimpleMessageReception");
c2.connect("testSimpleMessageReception");
Address c1_addr = c1.getAddress(), c2_addr = c2.getAddress();
MySender[] c1_senders = new MySender[NUM_THREADS];
for (int i = 0; i < c1_senders.length; i++) {
c1_senders[i] = new MySender(c1, c2_addr, latch);
c1_senders[i].start();
}
MySender[] c2_senders = new MySender[NUM_THREADS];
for (int i = 0; i < c2_senders.length; i++) {
c2_senders[i] = new MySender(c2, c1_addr, latch);
c2_senders[i].start();
}
Util.sleep(500);
latch.countDown(); // starts all threads
long NUM_EXPECTED_MSGS = NUM_THREADS * NUM_MSGS;
for (int i = 0; i < 20; i++) {
if (r1.getNum() == NUM_EXPECTED_MSGS && r2.getNum() == NUM_EXPECTED_MSGS) break;
Util.sleep(2000);
UNICAST2 unicast2 = (UNICAST2) c1.getProtocolStack().findProtocol(UNICAST2.class);
if (unicast2 != null) unicast2.sendStableMessages();
unicast2 = (UNICAST2) c2.getProtocolStack().findProtocol(UNICAST2.class);
if (unicast2 != null) unicast2.sendStableMessages();
}
System.out.println(
"c1 received "
+ r1.getNum()
+ " msgs, "
+ getNumberOfRetransmissions(c1)
+ " retransmissions");
System.out.println(
"c2 received "
+ r2.getNum()
+ " msgs, "
+ getNumberOfRetransmissions(c2)
+ " retransmissions");
assert r1.getNum() == NUM_EXPECTED_MSGS
: "expected " + NUM_EXPECTED_MSGS + ", but got " + r1.getNum();
assert r2.getNum() == NUM_EXPECTED_MSGS
: "expected " + NUM_EXPECTED_MSGS + ", but got " + r2.getNum();
}
/**
* Verifies that unicasts are received correctly by all participants after an overlapping merge.
* The following steps are executed:
*
* <ol>
* <li/>Group is {A,B,C}, A is the coordinator
* <li/>MERGE2 is removed from all members
* <li/>VERIFY_SUSPECT is removed from all members
* <li/>Everyone sends 5 unicast messages to everyone else
* <li/>A VIEW(B,C) is injected into B and C
* <li/>B and C install {B,C}
* <li/>B and C trash the connection table for A in UNICAST
* <li/>A still has view {A,B,C} and all connection tables intact in UNICAST
* <li/>We now send N unicasts from everyone to everyone else, all the unicasts should be
* received.
* </ol>
*/
public void testWithViewBC() throws Exception {
System.out.println("A's view: " + a.getView());
// Inject view {B,C} into B and C:
View new_view = Util.createView(b.getAddress(), 10, b.getAddress(), c.getAddress());
injectView(new_view, b, c);
assertEquals("A's view is " + a.getView(), 3, a.getView().size());
assertEquals("B's view is " + b.getView(), 2, b.getView().size());
assertEquals("C's view is " + c.getView(), 2, c.getView().size());
sendAndCheckMessages(5, a, b, c);
}
private static void createPartitions(JChannel... channels) throws Exception {
for (JChannel ch : channels) {
DISCARD discard = new DISCARD();
discard.setDiscardAll(true);
ch.getProtocolStack().insertProtocol(discard, ProtocolStack.Position.ABOVE, TP.class);
}
for (JChannel ch : channels) {
View view = View.create(ch.getAddress(), 10, ch.getAddress());
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
gms.installView(view);
}
}
/**
* Set Frame's title
*
* @param title : frame's title
*/
void setTitle(String title) {
String tmp = "";
if (noChannel) {
mainFrame.setTitle("JWhiteBoard");
return;
}
if (title != null) {
mainFrame.setTitle(title);
} else {
if (channel.getAddress() != null) tmp += channel.getAddress();
tmp += " (" + memberSize + ")";
mainFrame.setTitle(tmp);
}
}
@Test
public void testJoinMessageReceivedForDisconnectedHost() throws Exception {
final AtomicInteger counter1 = new AtomicInteger(0);
final AtomicInteger counter2 = new AtomicInteger(0);
connector1.subscribe(String.class.getName(), new CountingCommandHandler(counter1));
connector1.connect(20);
assertTrue(
"Expected connector 1 to connect within 10 seconds",
connector1.awaitJoined(10, TimeUnit.SECONDS));
connector2.subscribe(String.class.getName(), new CountingCommandHandler(counter2));
connector2.connect(80);
assertTrue("Connector 2 failed to connect", connector2.awaitJoined());
// wait for both connectors to have the same view
waitForConnectorSync();
ConsistentHash hashBefore = connector1.getConsistentHash();
// secretly insert an illegal message
channel1
.getReceiver()
.receive(
new Message(
channel1.getAddress(),
new IpAddress(12345),
new JoinMessage(10, Collections.<String>emptySet())));
ConsistentHash hash2After = connector1.getConsistentHash();
assertEquals("That message should not have changed the ring", hashBefore, hash2After);
}
/** Execute when new member join or leave Group */
public void viewAccepted(View v) {
memberSize = v.size();
if (mainFrame != null) setTitle();
members.clear();
members.addAll(v.getMembers());
if (v instanceof MergeView) {
System.out.println("** " + v);
// This is a simple merge function, which fetches the state from the coordinator
// on a merge and overwrites all of its own state
if (useState && !members.isEmpty()) {
Address coord = members.get(0);
Address local_addr = channel.getAddress();
if (local_addr != null && !local_addr.equals(coord)) {
try {
// make a copy of our state first
Map<Point, Color> copy = null;
if (send_own_state_on_merge) {
synchronized (drawPanel.state) {
copy = new LinkedHashMap<Point, Color>(drawPanel.state);
}
}
System.out.println("fetching state from " + coord);
channel.getState(coord, 5000);
if (copy != null)
sendOwnState(copy); // multicast my own state so everybody else has it too
} catch (Exception e) {
e.printStackTrace();
}
}
}
} else System.out.println("** View=" + v);
}
/** When receive a message, analyze message content and then execute the command: Draw or Clear */
public void receive(Message msg) {
byte[] buf = msg.getRawBuffer();
if (buf == null) {
System.err.println(
"["
+ channel.getAddress()
+ "] received null buffer from "
+ msg.getSrc()
+ ", headers: "
+ msg.printHeaders());
return;
}
try {
DrawCommand comm =
(DrawCommand)
Util.streamableFromByteBuffer(
DrawCommand.class, buf, msg.getOffset(), msg.getLength());
switch (comm.mode) {
case DrawCommand.DRAW:
if (drawPanel != null) drawPanel.drawPoint(comm);
break;
case DrawCommand.CLEAR:
clearPanel();
default:
System.err.println("***** received invalid draw command " + comm.mode);
break;
}
} catch (Exception e) {
e.printStackTrace();
}
}
private boolean viewContains(View view, JChannel... channels) {
boolean b = true;
for (JChannel ch : channels) {
b = b && view.containsMember(ch.getAddress());
}
return b;
}
private static void mergePartitions(JChannel... channels) throws Exception {
Membership membership = new Membership();
for (JChannel ch : channels) {
membership.add(ch.getAddress());
}
membership.sort();
Address leaderAddress = membership.elementAt(0);
JChannel leader = findChannelByAddress(leaderAddress, channels);
GMS gms = (GMS) leader.getProtocolStack().findProtocol(GMS.class);
gms.setLevel("trace");
Map<Address, View> views = new HashMap<>();
for (JChannel ch : channels) {
views.put(ch.getAddress(), ch.getView());
}
gms.up(new Event(Event.MERGE, views));
}
/**
* If the coordinator of the lock locks the lock and then send a message, the receiver will wait
* for ever in tryLock. However, castMessage will return after a while because of the default
* settings of RequestOptions.SYNC().
*/
public void testCoordSendFirst() throws Exception {
System.out.println("Running testCoordSendFirst");
// ===========================================================================
if (lock_a.tryLock()) {
try {
System.out.println("A aquired the lock, about to send message to B");
String rsp =
disp_a.sendMessage(
new Message(b.getAddress(), "bla"), RequestOptions.SYNC().setTimeout(60000));
if (rsp == null) {
System.err.println("ERROR: didn't return correctly");
Assert.fail("Didn't return correctly");
} else System.out.println("Returned: " + rsp);
} finally {
lock_a.unlock();
}
} else {
Assert.fail("The lock was already locked");
System.out.println("A failed to aquire the lock");
}
// ===========================================================================
System.out.println();
}
/** Tests https://jira.jboss.org/jira/browse/JGRP-1079 for unicast messages */
public void testOOBUnicastMessageLoss() throws Exception {
MyReceiver receiver = new MySleepingReceiver("C2", 1000);
b.setReceiver(receiver);
a.getProtocolStack().getTransport().setOOBRejectionPolicy("discard");
final int NUM = 10;
final Address dest = b.getAddress();
for (int i = 1; i <= NUM; i++) {
Message msg = new Message(dest, null, i);
msg.setFlag(Message.OOB);
a.send(msg);
}
Collection<Integer> msgs = receiver.getMsgs();
for (int i = 0; i < 20; i++) {
if (msgs.size() == NUM) break;
Util.sleep(1000);
// sendStableMessages(c1,c2); // not needed for unicasts !
}
assert msgs.size() == NUM
: "expected " + NUM + " messages but got " + msgs.size() + ", msgs=" + Util.print(msgs);
for (int i = 1; i <= NUM; i++) {
assert msgs.contains(i);
}
}
/**
* Tests sending 1, 2 (OOB) and 3, where they are received in the order 1, 3, 2. Message 3 should
* not get delivered until message 4 is received (http://jira.jboss.com/jira/browse/JGRP-780)
*/
public void testRegularAndOOBUnicasts() throws Exception {
DISCARD discard = new DISCARD();
ProtocolStack stack = a.getProtocolStack();
stack.insertProtocol(discard, ProtocolStack.BELOW, UNICAST.class, UNICAST2.class);
Address dest = b.getAddress();
Message m1 = new Message(dest, null, 1);
Message m2 = new Message(dest, null, 2);
m2.setFlag(Message.OOB);
Message m3 = new Message(dest, null, 3);
MyReceiver receiver = new MyReceiver("C2");
b.setReceiver(receiver);
a.send(m1);
discard.setDropDownUnicasts(1);
a.send(m2);
a.send(m3);
Collection<Integer> list = receiver.getMsgs();
int count = 10;
while (list.size() < 3 && --count > 0) {
Util.sleep(500); // time for potential retransmission
sendStableMessages(a, b);
}
assert list.size() == 3 : "list is " + list;
assert list.contains(1) && list.contains(2) && list.contains(3);
}
public void testRegularAndOOBUnicasts2() throws Exception {
DISCARD discard = new DISCARD();
ProtocolStack stack = a.getProtocolStack();
stack.insertProtocol(
discard, ProtocolStack.BELOW, (Class<? extends Protocol>[]) Util.getUnicastProtocols());
Address dest = b.getAddress();
Message m1 = new Message(dest, 1);
Message m2 = new Message(dest, 2).setFlag(Message.Flag.OOB);
Message m3 = new Message(dest, 3).setFlag(Message.Flag.OOB);
Message m4 = new Message(dest, 4);
MyReceiver receiver = new MyReceiver("B");
b.setReceiver(receiver);
a.send(m1);
discard.setDropDownUnicasts(2);
a.send(m2); // dropped
a.send(m3); // dropped
a.send(m4);
Collection<Integer> list = receiver.getMsgs();
int count = 10;
while (list.size() < 4 && --count > 0) {
Util.sleep(500); // time for potential retransmission
sendStableMessages(a, b);
}
System.out.println("list = " + list);
assert list.size() == 4 : "list is " + list;
assert list.contains(1) && list.contains(2) && list.contains(3) && list.contains(4);
}
private static JChannel findChannelByAddress(Address address, JChannel... channels) {
for (JChannel ch : channels) {
if (ch.getAddress().equals(address)) {
return ch;
}
}
return null;
}
@BeforeMethod
void init() throws Exception {
createChannels(true, true, (short) 5, (short) 5);
c1.setName("C1");
c2.setName("C2");
c3.setName("C3");
a1 = c1.getAddress();
a2 = c2.getAddress();
a3 = c3.getAddress();
r1 = new MyReceiver("C1");
r2 = new MyReceiver("C2");
r3 = new MyReceiver("C3");
c1.setReceiver(r1);
c2.setReceiver(r2);
c3.setReceiver(r3);
}
@BeforeMethod
void start() throws Exception {
r1 = new MyReceiver("A");
r2 = new MyReceiver("B");
a = new JChannel(props);
a.setName("A");
a.connect(CLUSTER);
a_addr = a.getAddress();
a.setReceiver(r1);
u1 = a.getProtocolStack().findProtocol(UNICAST.class);
b = new JChannel(props);
b.setName("B");
b.connect(CLUSTER);
b_addr = b.getAddress();
b.setReceiver(r2);
u2 = b.getProtocolStack().findProtocol(UNICAST.class);
System.out.println("A=" + a_addr + ", B=" + b_addr);
}
protected void receive(Message msg) {
String greeting = (String) msg.getObject();
msgs.add(greeting);
System.out.println("received " + greeting + " from " + msg.getSrc());
if (HELLO1.equals(greeting)) {
try {
a.send(new Message(a.getAddress(), HELLO2));
} catch (Exception e) {
ex = e;
}
}
}
private void sendAndCheckMessages(int num_msgs, JChannel... channels) throws Exception {
ra.clear();
rb.clear();
rc.clear();
// 1. send unicast messages
Set<Address> mbrs = new HashSet<Address>(channels.length);
for (JChannel ch : channels) mbrs.add(ch.getAddress());
for (JChannel ch : channels) {
Address addr = ch.getAddress();
for (Address dest : mbrs) {
for (int i = 1; i <= num_msgs; i++) {
ch.send(dest, null, "unicast msg #" + i + " from " + addr);
}
}
}
int total_msgs = num_msgs * channels.length;
MyReceiver[] receivers = new MyReceiver[channels.length];
for (int i = 0; i < channels.length; i++) receivers[i] = (MyReceiver) channels[i].getReceiver();
checkReceivedMessages(total_msgs, receivers);
}
/**
* Tests a simple split: {A,B} and {C,D} need to merge back into one subgroup. Checks how many
* MergeViews are installed
*/
public void testSplitInTheMiddle2() throws Exception {
View v1 = View.create(a.getAddress(), 10, a.getAddress(), b.getAddress());
View v2 = View.create(c.getAddress(), 10, c.getAddress(), d.getAddress());
injectView(v1, a, b);
injectView(v2, c, d);
enableInfoSender(false, a, b, c, d);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, a, b);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, c, d);
enableInfoSender(false, a, b, c, d);
for (JChannel ch : Arrays.asList(a, b, c, d))
System.out.println(ch.getName() + ": " + ch.getView());
System.out.println("\nEnabling INFO sending in merge protocols to merge subclusters");
enableInfoSender(true, a, b, c, d);
Util.waitUntilAllChannelsHaveSameSize(30000, 1000, a, b, c, d);
System.out.println("\nResulting views:");
for (JChannel ch : Arrays.asList(a, b, c, d)) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
View mv = gms.view();
System.out.println(mv);
}
for (JChannel ch : Arrays.asList(a, b, c, d)) {
GMS gms = (GMS) ch.getProtocolStack().findProtocol(GMS.class);
View mv = gms.view();
assert mv instanceof MergeView;
assert mv.size() == 4;
assert ((MergeView) mv).getSubgroups().size() == 2;
}
for (JChannel ch : Arrays.asList(a, b, c, d)) {
View view = ch.getView();
assert view.size() == 4 : "view should have 4 members: " + view;
}
}
@Test(dataProvider = "provider")
public void testSimpleMessageReception(String props) throws Exception {
c1 = new JChannel(props);
c2 = new JChannel(props);
MyReceiver r1 = new MyReceiver("c1"), r2 = new MyReceiver("c2");
c1.setReceiver(r1);
c2.setReceiver(r2);
c1.connect("testSimpleMessageReception");
c2.connect("testSimpleMessageReception");
int NUM = 100;
Address c1_addr = c1.getAddress(), c2_addr = c2.getAddress();
for (int i = 1; i <= NUM; i++) {
c1.send(c1_addr, "bla");
c1.send(c2_addr, "bla");
c2.send(c2_addr, "bla");
c2.send(c1_addr, "bla");
}
for (int i = 0; i < 10; i++) {
if (r1.getNum() == NUM * 2 && r2.getNum() == NUM * 2) break;
Util.sleep(500);
}
System.out.println(
"c1 received "
+ r1.getNum()
+ " msgs, "
+ getNumberOfRetransmissions(c1)
+ " retransmissions");
System.out.println(
"c2 received "
+ r2.getNum()
+ " msgs, "
+ getNumberOfRetransmissions(c2)
+ " retransmissions");
assert r1.getNum() == NUM * 2 : "expected " + NUM * 2 + ", but got " + r1.getNum();
assert r2.getNum() == NUM * 2 : "expected " + NUM * 2 + ", but got " + r2.getNum();
}
public void testWithEveryoneHavingASingletonView() throws Exception {
// Inject view {A} into A, B and C:
injectView(Util.createView(a.getAddress(), 10, a.getAddress()), a);
injectView(Util.createView(b.getAddress(), 10, b.getAddress()), b);
injectView(Util.createView(c.getAddress(), 10, c.getAddress()), c);
sendAndCheckMessages(5, a, b, c);
}
public void connect() {
try {
channel.connect("TOTAL_TOKEN_DEMO_GROUP");
} catch (ChannelException e) {
e.printStackTrace();
}
receiverThread = new ReceiverThread();
receiverThread.start();
Address a = channel.getAddress();
if (a != null) setTitle(a.toString());
else setTitle("Not connected");
control.connected();
}
/**
* Tests a simple split: {A,B} and {C,D} need to merge back into one subgroup. Checks how many
* MergeViews are installed
*/
public void testSplitInTheMiddle() {
View v1 = View.create(a.getAddress(), 10, a.getAddress(), b.getAddress());
View v2 = View.create(c.getAddress(), 10, c.getAddress(), d.getAddress());
injectView(v1, a, b);
injectView(v2, c, d);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, a, b);
Util.waitUntilAllChannelsHaveSameSize(10000, 500, c, d);
for (JChannel ch : Arrays.asList(a, b, c, d))
System.out.println(ch.getName() + ": " + ch.getView());
Address merge_leader_one =
new Membership().add(a.getAddress(), b.getAddress()).sort().elementAt(0);
Address merge_leader_two =
new Membership().add(c.getAddress(), d.getAddress()).sort().elementAt(0);
for (int x = 0; x < 20; x++) {
if (a.getView().size() == 4
&& b.getView().size() == 4
&& c.getView().size() == 4
&& d.getView().size() == 4) break;
for (JChannel ch : Arrays.asList(a, b, c, d)) {
MERGE3 merge = (MERGE3) ch.getProtocolStack().findProtocol(MERGE3.class);
merge.sendInfo(); // multicasts an INFO msg to everybody else
}
for (JChannel ch :
Arrays.asList(findChannel(merge_leader_one), findChannel(merge_leader_two))) {
MERGE3 merge = (MERGE3) ch.getProtocolStack().findProtocol(MERGE3.class);
merge.checkInconsistencies();
}
Util.sleep(1000);
}
for (JChannel ch : Arrays.asList(a, b, c, d))
System.out.println(ch.getName() + ": " + ch.getView());
for (JChannel ch : Arrays.asList(a, b, c, d))
assert ch.getView().size() == 4 : "view of " + ch.getName() + ": " + ch.getView();
}
/**
* Creates a list of randomly generated partitions, each having a max size of max_partition_size
*/
protected List<View> createPartitions(int max_partition_size, JChannel... channels) {
long view_id = 1;
for (JChannel ch : channels) view_id = Math.max(view_id, ch.getView().getViewId().getId());
List<View> partitions = new ArrayList<>();
List<Address> tmp = new ArrayList<>();
for (JChannel ch : channels) tmp.add(ch.getAddress());
while (!tmp.isEmpty()) {
int num_to_remove = (int) Util.random(max_partition_size);
List<Address> part = new ArrayList<>(max_partition_size);
for (int x = 0; x < num_to_remove && !tmp.isEmpty(); x++) part.add(tmp.remove(0));
partitions.add(new View(part.get(0), view_id + 1, part));
}
return partitions;
}