Examples with MessageReceiver com.google.cloud.pubsub.spi.v1.MessageReceiver used on opensource projects

Example 1 with MessageReceiver

use of com.google.cloud.pubsub.spi.v1.MessageReceiver in project google-cloud-java by GoogleCloudPlatform.

the class ITPubSubTest method testPublishSubscribe.

@Test
public void testPublishSubscribe() throws Exception {
    TopicName topicName = TopicName.create(projectId, formatForTest("testing-publish-subscribe-topic"));
    SubscriptionName subscriptionName = SubscriptionName.create(projectId, formatForTest("testing-publish-subscribe-subscription"));
    topicAdminClient.createTopic(topicName);
    subscriptionAdminClient.createSubscription(subscriptionName, topicName, PushConfig.newBuilder().build(), 10);
    PubsubMessage message = PubsubMessage.newBuilder().setData(ByteString.copyFromUtf8("my message")).build();
    final SettableApiFuture<PubsubMessage> received = SettableApiFuture.create();
    Subscriber subscriber = Subscriber.defaultBuilder(subscriptionName, new MessageReceiver() {

        @Override
        public void receiveMessage(final PubsubMessage message, final AckReplyConsumer consumer) {
            if (received.set(message)) {
                consumer.ack();
            } else {
                consumer.nack();
            }
        }
    }).build();
    subscriber.addListener(new Subscriber.Listener() {

        public void failed(Subscriber.State from, Throwable failure) {
            received.setException(failure);
        }
    }, MoreExecutors.directExecutor());
    subscriber.startAsync();
    Publisher publisher = Publisher.defaultBuilder(topicName).build();
    publisher.publish(message).get();
    publisher.shutdown();
    assertEquals(received.get().getData(), message.getData());
    subscriber.stopAsync().awaitTerminated();
    subscriptionAdminClient.deleteSubscription(subscriptionName);
    topicAdminClient.deleteTopic(topicName);
}

Example 2 with MessageReceiver

use of com.google.cloud.pubsub.spi.v1.MessageReceiver in project google-cloud-java by GoogleCloudPlatform.

the class ITPubSubSnippets method testPublisherSubscriberHelper.

private void testPublisherSubscriberHelper(TopicName topicName, SubscriptionName subscriptionName) throws Exception {
    String messageToPublish = "my-message";
    Publisher publisher = null;
    try {
        publisher = Publisher.defaultBuilder(topicName).build();
        PublisherSnippets snippets = new PublisherSnippets(publisher);
        final SettableApiFuture<Void> done = SettableApiFuture.create();
        ApiFutures.addCallback(snippets.publish(messageToPublish), new ApiFutureCallback<String>() {

            public void onSuccess(String messageId) {
                done.set(null);
            }

            public void onFailure(Throwable t) {
                done.setException(t);
            }
        });
        done.get();
    } finally {
        if (publisher != null) {
            publisher.shutdown();
        }
    }
    final BlockingQueue<PubsubMessage> queue = new ArrayBlockingQueue<>(1);
    final SettableApiFuture<Void> done = SettableApiFuture.create();
    final SettableApiFuture<PubsubMessage> received = SettableApiFuture.create();
    SubscriberSnippets snippets = new SubscriberSnippets(subscriptionName, new MessageReceiverSnippets(queue).messageReceiver(), done, MoreExecutors.directExecutor());
    new Thread(new Runnable() {

        @Override
        public void run() {
            try {
                received.set(queue.poll(10, TimeUnit.MINUTES));
            } catch (InterruptedException e) {
                received.set(null);
            }
            // signal the subscriber to clean up
            done.set(null);
        }
    }).start();
    // blocks until done is set
    snippets.startAndWait();
    PubsubMessage message = received.get();
    assertNotNull(message);
    assertEquals(message.getData().toStringUtf8(), messageToPublish);
}

Example 3 with MessageReceiver

use of com.google.cloud.pubsub.spi.v1.MessageReceiver in project google-cloud-java by GoogleCloudPlatform.

the class CreateSubscriptionAndConsumeMessages method main.

public static void main(String... args) throws Exception {
    TopicName topic = TopicName.create("my-project-id", "my-topic-id");
    SubscriptionName subscription = SubscriptionName.create("my-project-id", "my-topic-id");
    try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
        subscriptionAdminClient.createSubscription(subscription, topic, PushConfig.getDefaultInstance(), 0);
    }
    MessageReceiver receiver = new MessageReceiver() {

        @Override
        public void receiveMessage(PubsubMessage message, AckReplyConsumer consumer) {
            System.out.println("Received message: " + message.getData().toStringUtf8());
            consumer.ack();
        }
    };
    Subscriber subscriber = null;
    try {
        subscriber = Subscriber.defaultBuilder(subscription, receiver).build();
        subscriber.addListener(new Subscriber.Listener() {

            @Override
            public void failed(Subscriber.State from, Throwable failure) {
                // Handle failure. This is called when the Subscriber encountered a fatal error and is shutting down.
                System.err.println(failure);
            }
        }, MoreExecutors.directExecutor());
        subscriber.startAsync().awaitRunning();
        Thread.sleep(60000);
    } finally {
        if (subscriber != null) {
            subscriber.stopAsync();
        }
    }
}

Example 4 with MessageReceiver

use of com.google.cloud.pubsub.spi.v1.MessageReceiver in project google-cloud-java by GoogleCloudPlatform.

the class SubscriberSnippets method createSubscriber.

private void createSubscriber() throws Exception {
    // [START pubsub_pull]
    String projectId = "my-project-id";
    String subscriptionId = "my-subscription-id";
    SubscriptionName subscriptionName = SubscriptionName.create(projectId, subscriptionId);
    // Instantiate an asynchronous message receiver
    MessageReceiver receiver = new MessageReceiver() {

        @Override
        public void receiveMessage(PubsubMessage message, AckReplyConsumer consumer) {
            // handle incoming message, then ack/nack the received message
            System.out.println("Id : " + message.getMessageId());
            System.out.println("Data : " + message.getData().toStringUtf8());
            consumer.ack();
        }
    };
    Subscriber subscriber = null;
    try {
        // Create a subscriber for "my-subscription-id" bound to the message receiver
        subscriber = Subscriber.defaultBuilder(subscriptionName, receiver).build();
        subscriber.startAsync();
    // ...
    } finally {
        // stop receiving messages
        if (subscriber != null) {
            subscriber.stopAsync();
        }
    }
// [END pubsub_pull]
}