Java tutorial
/* * Copyright 2016 Google Inc. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.google.cloud.examples.pubsub.snippets; import com.google.cloud.pubsub.spi.v1.AckReply; import com.google.cloud.pubsub.spi.v1.AckReplyConsumer; import com.google.cloud.pubsub.spi.v1.MessageReceiver; import com.google.cloud.pubsub.spi.v1.Subscriber; import com.google.cloud.pubsub.spi.v1.SubscriberClient; import com.google.common.util.concurrent.MoreExecutors; import com.google.pubsub.v1.PubsubMessage; import com.google.pubsub.v1.PushConfig; import com.google.pubsub.v1.SubscriptionName; import com.google.pubsub.v1.TopicName; /** * A snippet for Google Cloud Pub/Sub showing how to create a Pub/Sub pull subscription and * asynchronously pull messages from it. */ public class CreateSubscriptionAndPullMessages { public static void main(String... args) throws Exception { TopicName topic = TopicName.create("test-project", "test-topic"); SubscriptionName subscription = SubscriptionName.create("test-project", "test-subscription"); try (SubscriberClient subscriberClient = SubscriberClient.create()) { subscriberClient.createSubscription(subscription, topic, PushConfig.getDefaultInstance(), 0); } MessageReceiver receiver = new MessageReceiver() { @Override public void receiveMessage(PubsubMessage message, AckReplyConsumer consumer) { System.out.println("got message: " + message.getData().toStringUtf8()); consumer.accept(AckReply.ACK, null); } }; Subscriber subscriber = null; try { subscriber = Subscriber.newBuilder(subscription, receiver).build(); subscriber.addListener(new Subscriber.SubscriberListener() { @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(); } } } }