/**
* Executes example.
*
* @param args Command line arguments, none required.
* @throws GridException If example execution failed.
*/
public static void main(String[] args) throws Exception {
Timer timer = new Timer("priceBars");
// Start grid.
final Grid g = GridGain.start("examples/config/example-streamer.xml");
System.out.println();
System.out.println(">>> Streaming price bars example started.");
try {
TimerTask task = scheduleQuery(g, timer);
streamData(g);
// Force one more run to get final results.
task.run();
timer.cancel();
// Reset all streamers on all nodes to make sure that
// consecutive executions start from scratch.
g.compute()
.broadcast(
new Runnable() {
@Override
public void run() {
if (!ExamplesUtils.hasStreamer(g, "priceBars"))
System.err.println(
"Default streamer not found (is example-streamer.xml "
+ "configuration used on all nodes?)");
else {
GridStreamer streamer = g.streamer("priceBars");
System.out.println("Clearing bars from streamer.");
streamer.reset();
}
}
})
.get();
} finally {
GridGain.stop(true);
}
}
/**
* Executes example.
*
* @param args Command line arguments, none required.
* @throws GridException If example execution failed.
*/
public static void main(String[] args) throws GridException {
try (Grid g = GridGain.start("examples/config/example-compute.xml")) {
System.out.println();
System.out.println("Compute schedule example started.");
// Schedule output message every minute.
GridSchedulerFuture<?> fut =
g.scheduler()
.scheduleLocal(
new Callable<Integer>() {
private int invocations;
@Override
public Integer call() {
invocations++;
try {
g.compute()
.broadcast(
new GridRunnable() {
@Override
public void run() {
System.out.println();
System.out.println("Howdy! :) ");
}
})
.get();
} catch (GridException e) {
throw new GridRuntimeException(e);
}
return invocations;
}
},
"{5, 3} * * * * *" // Cron expression.
);
while (!fut.isDone()) System.out.println(">>> Invocation #: " + fut.get());
System.out.println();
System.out.println(">>> Schedule future is done and has been unscheduled.");
System.out.println(">>> Check all nodes for hello message output.");
}
}
/**
* Streams random prices into the system.
*
* @param g Grid.
* @throws GridException If failed.
*/
private static void streamData(final Grid g) throws GridException {
GridStreamer streamer = g.streamer("priceBars");
for (int i = 0; i < CNT; i++) {
for (int j = 0; j < INSTRUMENTS.length; j++) {
// Use gaussian distribution to ensure that
// numbers closer to 0 have higher probability.
double price = round2(INITIAL_PRICES[j] + RAND.nextGaussian());
Quote quote = new Quote(INSTRUMENTS[j], price);
streamer.addEvent(quote);
}
}
}