Examples with DispatchCallback org.apache.camel.component.reactive.streams.api.DispatchCallback used on opensource projects

Example 1 with DispatchCallback

use of org.apache.camel.component.reactive.streams.api.DispatchCallback in project camel by apache.

the class CamelPublisher method publish.

public void publish(StreamPayload<Exchange> data) {
    // freeze the subscriptions
    List<CamelSubscription> subs = new LinkedList<>(subscriptions);
    DispatchCallback<Exchange> originalCallback = data.getCallback();
    if (originalCallback != null && subs.size() > 0) {
        // When multiple subscribers have an active subscription,
        // we aknowledge the exchange once it has been delivered to every
        // subscriber (or their subscription is cancelled)
        AtomicInteger counter = new AtomicInteger(subs.size());
        // Use just the first exception in the callback when multiple exceptions are thrown
        AtomicReference<Throwable> thrown = new AtomicReference<>(null);
        data = new StreamPayload<>(data.getItem(), (ex, error) -> {
            thrown.compareAndSet(null, error);
            if (counter.decrementAndGet() == 0) {
                originalCallback.processed(ex, thrown.get());
            }
        });
    }
    if (subs.size() > 0) {
        LOG.debug("Exchange published to {} subscriptions for the stream {}: {}", subs.size(), name, data.getItem());
        // at least one subscriber
        for (CamelSubscription sub : subs) {
            sub.publish(data);
        }
    } else {
        data.getCallback().processed(data.getItem(), new IllegalStateException("The stream has no active subscriptions"));
    }
}