public InstanceSkipper(RingManager ring, CoordinatorRole coordinator) {
this.coordinator = coordinator;
this.ring = ring;
if (ring.getConfiguration().containsKey(ConfigKey.multi_ring_start_time)) {
this.boot_time = Long.parseLong(ring.getConfiguration().get(ConfigKey.multi_ring_start_time));
} else {
this.boot_time = 0;
}
logger.info("InstanceSkipper use boot time: " + boot_time);
}
@Override
public void run() {
if (coordinator.multi_ring_lambda > 0) {
while (ring.isNodeCoordinator()) {
try {
long time = System.currentTimeMillis();
int latency_compensation = coordinator.latency_compensation;
long valueSent = coordinator.value_count.get();
float executionTime = ((float) (time - boot_time - latency_compensation)) / 1000.0f;
long expectedValues = (long) ((coordinator.multi_ring_lambda) * executionTime);
long skip = expectedValues - valueSent;
if (skip > 0) {
if (logger.isTraceEnabled()) {
logger.trace(String.format("InstanceSkipper sent skip %d values", skip));
}
Promise p = null;
try {
p = coordinator.getPromiseQueue().take(); // wait for a promise
} catch (InterruptedException e) {
}
// send Phase2 with skip value
if (p != null) {
Value v = new Value(Value.getSkipID(), Long.toString(skip).getBytes());
coordinator.value_count.addAndGet(skip);
Message m =
new Message(
p.getInstance(),
ring.getNodeID(),
PaxosRole.Acceptor,
MessageType.Phase2,
p.getBallot(),
0,
v);
if (ring.getNetwork().getLearner() != null) {
ring.getNetwork().getLearner().deliver(ring, m);
}
if (ring.getNetwork().getAcceptor() != null) {
ring.getNetwork().getAcceptor().deliver(ring, m);
} else { // else should never happen, since there is no coordinator without acceptor!
ring.getNetwork().send(m);
}
}
}
Thread.sleep(coordinator.multi_ring_delta_t);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
break;
}
}
logger.debug("InstanceSkipper stopped.");
}
}
