/**
* Generates new UUID and sets local address. Sends down a REMOVE_ADDRESS (if existing address was
* present) and a SET_LOCAL_ADDRESS
*/
protected void setAddress() {
Address old_addr = local_addr;
local_addr = generateAddress();
if (old_addr != null) down(new Event(Event.REMOVE_ADDRESS, old_addr));
if (name == null || name.isEmpty()) // generate a logical name if not set
name = Util.generateLocalName();
if (name != null && !name.isEmpty()) UUID.add(local_addr, name);
Event evt = new Event(Event.SET_LOCAL_ADDRESS, local_addr);
down(evt);
if (up_handler != null) up_handler.up(evt);
}
@ManagedOperation(description = "Disconnects the channel if connected")
public synchronized void disconnect() {
switch (state) {
case OPEN:
case CLOSED:
return;
case CONNECTING:
case CONNECTED:
if (cluster_name != null) {
// Send down a DISCONNECT event, which travels down to the GMS, where a response is
// returned
try {
down(new Event(Event.DISCONNECT, local_addr)); // DISCONNECT is handled by each layer
} catch (Throwable t) {
log.error(Util.getMessage("DisconnectFailure"), local_addr, t);
}
}
state = State.OPEN;
stopStack(true, false);
notifyChannelDisconnected(this);
init(); // sets local_addr=null; changed March 18 2003 (bela) -- prevented successful
// rejoining
break;
default:
throw new IllegalStateException("state " + state + " unknown");
}
}
private static void injectView(View view, JChannel... channels) {
for (JChannel ch : channels) {
ch.down(new Event(Event.VIEW_CHANGE, view));
ch.up(new Event(Event.VIEW_CHANGE, view));
}
for (JChannel ch : channels) {
MyReceiver receiver = (MyReceiver) ch.getReceiver();
System.out.println("[" + receiver.name + "] view=" + ch.getView());
}
}
protected void _connect(Event connect_event) throws Exception {
try {
down(connect_event);
} catch (Throwable t) {
stopStack(true, false);
state = State.OPEN;
init();
throw new Exception("connecting to channel \"" + connect_event.getArg() + "\" failed", t);
}
}
public void startFlush(boolean automatic_resume) throws Exception {
if (!flushSupported())
throw new IllegalStateException(
"Flush is not supported, add pbcast.FLUSH protocol to your configuration");
try {
down(new Event(Event.SUSPEND));
} catch (Exception e) {
throw new Exception("Flush failed", e.getCause());
} finally {
if (automatic_resume) stopFlush();
}
}
protected void getState(Address target, long timeout, Callable<Boolean> flushInvoker)
throws Exception {
checkClosedOrNotConnected();
if (!state_transfer_supported)
throw new IllegalStateException(
"fetching state will fail as state transfer is not supported. "
+ "Add one of the state transfer protocols to your configuration");
if (target == null) target = determineCoordinator();
if (target != null && local_addr != null && target.equals(local_addr)) {
log.trace(
local_addr
+ ": cannot get state from myself ("
+ target
+ "): probably the first member");
return;
}
boolean initiateFlush = flushSupported() && flushInvoker != null;
if (initiateFlush) {
boolean successfulFlush = false;
try {
successfulFlush = flushInvoker.call();
} catch (Throwable e) {
successfulFlush = false; // http://jira.jboss.com/jira/browse/JGRP-759
}
if (!successfulFlush)
throw new IllegalStateException(
"Node " + local_addr + " could not flush the cluster for state retrieval");
}
state_promise.reset();
StateTransferInfo state_info = new StateTransferInfo(target, timeout);
long start = System.currentTimeMillis();
down(new Event(Event.GET_STATE, state_info));
StateTransferResult result = state_promise.getResult(state_info.timeout);
if (initiateFlush) stopFlush();
if (result == null)
throw new StateTransferException(
"timeout during state transfer (" + (System.currentTimeMillis() - start) + "ms)");
if (result.hasException())
throw new StateTransferException("state transfer failed", result.getException());
}
public void startFlush(List<Address> flushParticipants, boolean automatic_resume)
throws Exception {
if (!flushSupported())
throw new IllegalStateException(
"Flush is not supported, add pbcast.FLUSH protocol to your configuration");
View v = getView();
boolean validParticipants = v != null && v.getMembers().containsAll(flushParticipants);
if (!validParticipants)
throw new IllegalArgumentException(
"Current view " + v + " does not contain all flush participants " + flushParticipants);
try {
down(new Event(Event.SUSPEND, flushParticipants));
} catch (Exception e) {
throw new Exception("Flush failed", e.getCause());
} finally {
if (automatic_resume) stopFlush(flushParticipants);
}
}
public void testFlushWithCrashedFlushCoordinator() throws Exception {
JChannel a = null, b = null, c = null;
try {
a = createChannel(true, 3, "A");
changeProps(a);
a.connect("testFlushWithCrashedFlushCoordinator");
b = createChannel(a, "B");
changeProps(b);
b.connect("testFlushWithCrashedFlushCoordinator");
c = createChannel(a, "C");
changeProps(c);
c.connect("testFlushWithCrashedFlushCoordinator");
System.out.println("shutting down flush coordinator B");
b.down(new Event(Event.SUSPEND_BUT_FAIL)); // send out START_FLUSH and then return
// now shut down B. This means, after failure detection kicks in and the new coordinator takes
// over
// (either A or C), that the current flush started by B will be cancelled and a new flush (by
// A or C)
// will be started
Util.shutdown(b);
a.getProtocolStack().findProtocol(FLUSH.class).setLevel("debug");
c.getProtocolStack().findProtocol(FLUSH.class).setLevel("debug");
Util.waitUntilAllChannelsHaveSameSize(10000, 500, a, c);
// cluster should not hang and two remaining members should have a correct view
assertTrue("correct view size", a.getView().size() == 2);
assertTrue("correct view size", c.getView().size() == 2);
a.getProtocolStack().findProtocol(FLUSH.class).setLevel("warn");
c.getProtocolStack().findProtocol(FLUSH.class).setLevel("warn");
} finally {
Util.close(c, b, a);
}
}
/**
* Initializes all variables. Used after <tt>close()</tt> or <tt>disconnect()</tt>, to be ready
* for new <tt>connect()</tt>
*/
protected void init() {
if (local_addr != null) down(new Event(Event.REMOVE_ADDRESS, local_addr));
local_addr = null;
cluster_name = null;
my_view = null;
}
public void send(Message msg) throws Exception {
checkClosedOrNotConnected();
if (msg == null) throw new NullPointerException("msg is null");
down(new Event(Event.MSG, msg));
}
public void stopFlush(List<Address> flushParticipants) {
if (!flushSupported())
throw new IllegalStateException(
"Flush is not supported, add pbcast.FLUSH protocol to your configuration");
down(new Event(Event.RESUME, flushParticipants));
}
public void stopFlush() {
if (!flushSupported())
throw new IllegalStateException(
"Flush is not supported, add pbcast.FLUSH protocol to your configuration");
down(new Event(Event.RESUME));
}