@Test
public void workerOrchestrator() throws InterruptedException {
Reactor reactor = Reactors.reactor(env, Environment.WORK_QUEUE);
CountDownLatch latch = new CountDownLatch(3);
reactor.on(
Selectors.$("worker"),
new Consumer() {
@Override
public void accept(Object o) {
System.out.println(Thread.currentThread().getName() + " worker " + o);
reactor.notify("orchestrator", Event.wrap(1000));
latch.countDown();
System.out.println(Thread.currentThread().getName() + " ok");
}
});
reactor.on(
Selectors.$("orchestrator"),
new Consumer<Event<Integer>>() {
@Override
public void accept(Event<Integer> event) {
sendTask();
}
void sendTask() {
System.out.println(Thread.currentThread().getName() + " sendTask ");
reactor.notify("worker", Event.wrap(latch.getCount()));
latch.countDown();
}
});
reactor.notify("orchestrator", Event.wrap(1000));
Assert.isTrue(latch.await(10, TimeUnit.SECONDS));
}
@Override
public <V, X extends Throwable> StateMachine<T> when(
Class<X> errorType, final Consumer<Tuple3<V, T, X>> errorConsumer) {
observable.on(
Selectors.type(errorType),
new Consumer<Event<Throwable>>() {
@SuppressWarnings("unchecked")
@Override
public void accept(Event<Throwable> ev) {
if (null != errorConsumer && ev.getData() instanceof StateException) {
V state = (V) ((StateException) ev.getData()).state;
X cause = (X) ev.getData().getCause();
T data = (T) ((StateException) ev.getData()).data;
errorConsumer.accept(Tuple.of(state, data, cause));
}
}
});
return this;
}
@Override
public <V> StateMachine<T> on(final V state, final Function<T, T> fn) {
if (strict) {
Assert.isTrue(states.contains(state), "State " + state + " has not been defined");
}
observable.on(
(state instanceof Selector ? (Selector) state : Selectors.object(state)),
new Consumer<Event<T>>() {
@SuppressWarnings("unchecked")
@Override
public void accept(final Event<T> data) {
try {
data.setData(fn.apply(data.getData()));
} catch (Throwable t) {
observable.notify(
t.getClass(), Event.wrap(new StateException(t, state, data.getData())));
}
}
});
return this;
}
/**
* Subclasses should register the given {@link reactor.net.NetChannel} for later use.
*
* @param ioChannel The channel object.
* @param netChannel The {@link NetChannel}.
* @param <C> The type of the channel object.
* @return {@link reactor.event.registry.Registration} of this channel in the {@link Registry}.
*/
protected <C> Registration<? extends NetChannel<IN, OUT>> register(
@Nonnull C ioChannel, @Nonnull NetChannel<IN, OUT> netChannel) {
Assert.notNull(ioChannel, "Channel cannot be null.");
Assert.notNull(netChannel, "NetChannel cannot be null.");
return netChannels.register(Selectors.$(ioChannel), netChannel);
}
/**
* Abstract base class that implements common functionality shared by clients and servers.
*
* @author Jon Brisbin
*/
public abstract class AbstractNetPeer<IN, OUT> {
private final Registry<NetChannel<IN, OUT>> netChannels =
new CachingRegistry<NetChannel<IN, OUT>>();
private final Event<AbstractNetPeer<IN, OUT>> selfEvent = Event.wrap(this);
private final Selector open = Selectors.$();
private final Selector close = Selectors.$();
private final Selector start = Selectors.$();
private final Selector shutdown = Selectors.$();
private final Environment env;
private final Reactor reactor;
private final Codec<Buffer, IN, OUT> codec;
private final Collection<Consumer<NetChannel<IN, OUT>>> consumers;
protected AbstractNetPeer(
@Nonnull Environment env,
@Nonnull Reactor reactor,
@Nullable Codec<Buffer, IN, OUT> codec,
@Nonnull Collection<Consumer<NetChannel<IN, OUT>>> consumers) {
this.env = env;
this.reactor = reactor;
this.codec = codec;
this.consumers = consumers;
for (final Consumer<NetChannel<IN, OUT>> consumer : consumers) {
reactor.on(
open,
new Consumer<Event<NetChannel<IN, OUT>>>() {
@Override
public void accept(Event<NetChannel<IN, OUT>> ev) {
consumer.accept(ev.getData());
}
});
}
}
public Promise<Boolean> close() {
Deferred<Boolean, Promise<Boolean>> d = Promises.defer(env, reactor.getDispatcher());
close(d);
return d.compose();
}
public void close(@Nullable final Consumer<Boolean> onClose) {
reactor.schedule(
new Consumer<Void>() {
@Override
public void accept(Void v) {
for (Registration<? extends NetChannel<IN, OUT>> reg : getChannels()) {
if (null == reg) {
continue;
}
doCloseChannel(reg.getObject());
}
getChannels().clear();
doClose(onClose);
}
},
null);
}
/**
* Subclasses should register the given {@link reactor.net.NetChannel} for later use.
*
* @param ioChannel The channel object.
* @param netChannel The {@link NetChannel}.
* @param <C> The type of the channel object.
* @return {@link reactor.event.registry.Registration} of this channel in the {@link Registry}.
*/
protected <C> Registration<? extends NetChannel<IN, OUT>> register(
@Nonnull C ioChannel, @Nonnull NetChannel<IN, OUT> netChannel) {
Assert.notNull(ioChannel, "Channel cannot be null.");
Assert.notNull(netChannel, "NetChannel cannot be null.");
return netChannels.register(Selectors.$(ioChannel), netChannel);
}
/**
* Find the {@link NetChannel} for the given IO channel object.
*
* @param ioChannel The channel object.
* @param <C> The type of the channel object.
* @return The {@link NetChannel} associated with the given channel.
*/
protected <C> NetChannel<IN, OUT> select(@Nonnull C ioChannel) {
Assert.notNull(ioChannel, "Channel cannot be null.");
Iterator<Registration<? extends NetChannel<IN, OUT>>> channs =
netChannels.select(ioChannel).iterator();
if (channs.hasNext()) {
return channs.next().getObject();
} else {
NetChannel<IN, OUT> conn = createChannel(ioChannel);
register(ioChannel, conn);
notifyOpen(conn);
return conn;
}
}
/**
* Close the given channel.
*
* @param channel The channel object.
* @param <C> The type of the channel object.
*/
protected <C> void close(@Nonnull C channel) {
Assert.notNull(channel, "Channel cannot be null");
for (Registration<? extends NetChannel<IN, OUT>> reg : netChannels.select(channel)) {
NetChannel<IN, OUT> chann = reg.getObject();
reg.cancel();
notifyClose(chann);
}
}
/**
* Subclasses should implement this method and provide a {@link NetChannel} object.
*
* @param ioChannel The IO channel object to associate with this {@link reactor.net.NetChannel}.
* @param <C> The type of the channel object.
* @return The new {@link NetChannel} object.
*/
protected abstract <C> NetChannel<IN, OUT> createChannel(C ioChannel);
/** Notify this server's consumers that the server has started. */
protected void notifyStart(final Runnable started) {
getReactor().notify(start.getObject(), selfEvent);
if (null != started) {
getReactor()
.schedule(
new Consumer<Runnable>() {
@Override
public void accept(Runnable r) {
r.run();
}
},
started);
}
}
/**
* Notify this client's consumers than a global error has occurred.
*
* @param error The error to notify.
*/
protected void notifyError(@Nonnull Throwable error) {
Assert.notNull(error, "Error cannot be null.");
reactor.notify(error.getClass(), Event.wrap(error));
}
/**
* Notify this peer's consumers that the channel has been opened.
*
* @param channel The channel that was opened.
*/
protected void notifyOpen(@Nonnull NetChannel<IN, OUT> channel) {
reactor.notify(open.getObject(), Event.wrap(channel));
}
/**
* Notify this peer's consumers that the given channel has been closed.
*
* @param channel The channel that was closed.
*/
protected void notifyClose(@Nonnull NetChannel<IN, OUT> channel) {
reactor.notify(close.getObject(), Event.wrap(channel));
}
/** Notify this server's consumers that the server has stopped. */
protected void notifyShutdown() {
getReactor().notify(shutdown.getObject(), selfEvent);
}
/**
* Get the {@link Codec} in use.
*
* @return The codec. May be {@literal null}.
*/
@Nullable
protected Codec<Buffer, IN, OUT> getCodec() {
return codec;
}
@Nonnull
protected Environment getEnvironment() {
return env;
}
@Nonnull
protected Reactor getReactor() {
return reactor;
}
@Nonnull
protected Collection<Consumer<NetChannel<IN, OUT>>> getConsumers() {
return consumers;
}
@Nonnull
protected Registry<NetChannel<IN, OUT>> getChannels() {
return netChannels;
}
/**
* Subclasses should implement this method to perform the actual IO channel close.
*
* @param onClose
*/
protected void doClose(@Nullable Consumer<Boolean> onClose) {
getReactor().schedule(onClose, null);
}
/**
* Close the given channel.
*
* @param channel
*/
protected void doCloseChannel(NetChannel<IN, OUT> channel) {
channel.close();
}
}
public static void main(String[] args) throws Exception {
Environment env = new Environment();
final TradeServer server = new TradeServer();
// Use a Reactor to dispatch events using the high-speed Dispatcher
final Reactor serverReactor = Reactors.reactor(env);
// Create a single key and Selector for efficiency
final Selector tradeExecute = Selectors.object("trade.execute");
// For each Trade event, execute that on the server and notify connected clients
// because each client that connects links to the serverReactor
serverReactor.on(
tradeExecute,
(Event<Trade> ev) -> {
server.execute(ev.getData());
// Since we're async, for this test, use a latch to tell when we're done
latch.countDown();
});
@SuppressWarnings("serial")
WebSocketServlet wss =
new WebSocketServlet() {
@Override
public void configure(WebSocketServletFactory factory) {
factory.setCreator(
(req, resp) ->
new WebSocketListener() {
AtomicLong counter = new AtomicLong();
@Override
public void onWebSocketBinary(byte[] payload, int offset, int len) {}
@Override
public void onWebSocketClose(int statusCode, String reason) {}
@Override
public void onWebSocketConnect(final Session session) {
LOG.info("Connected a websocket client: {}", session);
// Keep track of a rolling average
final AtomicReference<Float> avg = new AtomicReference<>(0f);
serverReactor.on(
tradeExecute,
(Event<Trade> ev) -> {
Trade t = ev.getData();
avg.set((avg.get() + t.getPrice()) / 2);
// Send a message every 1000th trade.
// Otherwise, we completely overwhelm the browser and network.
if (counter.incrementAndGet() % 1000 == 0) {
try {
session
.getRemote()
.sendString(String.format("avg: %s", avg.get()));
} catch (IOException e) {
if (!"Failed to write bytes".equals(e.getMessage())) {
e.printStackTrace();
}
}
}
});
}
@Override
public void onWebSocketError(Throwable cause) {}
@Override
public void onWebSocketText(String message) {}
});
}
};
serve(wss);
LOG.info(
"Connect websocket clients now (waiting for 10 seconds).\n"
+ "Open websocket/src/main/webapp/ws.html in a browser...");
Thread.sleep(10000);
// Start a throughput timer
startTimer();
// Publish one event per trade
for (int i = 0; i < totalTrades; i++) {
// Pull next randomly-generated Trade from server
Trade t = server.nextTrade();
// Notify the Reactor the event is ready to be handled
serverReactor.notify(tradeExecute.getObject(), Event.wrap(t));
}
// Stop throughput timer and output metrics
endTimer();
server.stop();
}
