Examples with MessageHandler io.eventuate.tram.messaging.consumer.MessageHandler used on opensource projects

Example 1 with MessageHandler

use of io.eventuate.tram.messaging.consumer.MessageHandler in project eventuate-tram-core by eventuate-tram.

the class MessageConsumerKafkaImpl method subscribe.

@Override
public void subscribe(String subscriberId, Set<String> channels, MessageHandler handler) {
    BiConsumer<ConsumerRecord<String, String>, BiConsumer<Void, Throwable>> kcHandler = (record, callback) -> {
        Message m = toMessage(record);
        // TODO If we do that here then remove TT from higher-levels
        transactionTemplate.execute(ts -> {
            if (duplicateMessageDetector.isDuplicate(subscriberId, m.getId())) {
                logger.trace("Duplicate message {} {}", subscriberId, m.getId());
                callback.accept(null, null);
                return null;
            }
            try {
                logger.trace("Invoking handler {} {}", subscriberId, m.getId());
                handler.accept(m);
            } catch (Throwable t) {
                logger.trace("Got exception {} {}", subscriberId, m.getId());
                logger.trace("Got exception ", t);
                callback.accept(null, t);
                return null;
            }
            logger.trace("handled message {} {}", subscriberId, m.getId());
            callback.accept(null, null);
            return null;
        });
    };
    EventuateKafkaConsumer kc = new EventuateKafkaConsumer(subscriberId, kcHandler, new ArrayList<>(channels), bootstrapServers);
    consumers.add(kc);
    kc.start();
}

Example 2 with MessageHandler

use of io.eventuate.tram.messaging.consumer.MessageHandler in project eventuate-tram-core by eventuate-tram.

the class AbstractTramIntegrationTest method shouldDoSomething.

@Test
public void shouldDoSomething() throws InterruptedException {
    String destination = "Destination-" + System.currentTimeMillis();
    String subscriberId = "SubscriberId-" + System.currentTimeMillis();
    CountDownLatch latch = new CountDownLatch(1);
    MessageHandler handler = message -> {
        System.out.println("Got message=" + message);
        latch.countDown();
    };
    messageConsumer.subscribe(subscriberId, Collections.singleton(destination), handler);
    messageProducer.send(destination, MessageBuilder.withPayload("Hello").build());
    assertTrue("Expected message", latch.await(10, TimeUnit.SECONDS));
}