/
SubscriberIT.java
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/
SubscriberIT.java
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/*
* Copyright 2020 Google LLC
*
* 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 pubsub;
import static com.google.common.truth.Truth.assertThat;
import static junit.framework.TestCase.assertNotNull;
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutures;
import com.google.api.gax.core.ExecutorProvider;
import com.google.api.gax.core.InstantiatingExecutorProvider;
import com.google.cloud.pubsub.v1.Publisher;
import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
import com.google.cloud.pubsub.v1.TopicAdminClient;
import com.google.common.collect.ImmutableMap;
import com.google.protobuf.ByteString;
import com.google.pubsub.v1.ProjectSubscriptionName;
import com.google.pubsub.v1.ProjectTopicName;
import com.google.pubsub.v1.PubsubMessage;
import com.google.pubsub.v1.Subscription;
import com.google.pubsub.v1.Topic;
import com.google.pubsub.v1.TopicName;
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import org.junit.After;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.Timeout;
public class SubscriberIT {
private ByteArrayOutputStream bout;
private PrintStream out;
private static final String projectId = System.getenv("GOOGLE_CLOUD_PROJECT");
private static final String _suffix = UUID.randomUUID().toString();
private static final String topicId = "subscriber-test-topic-" + _suffix;
private static final String subscriptionId = "subscriber-test-subscription-" + _suffix;
private static final TopicName topicName = TopicName.of(projectId, topicId);
private static final ProjectSubscriptionName subscriptionName =
ProjectSubscriptionName.of(projectId, subscriptionId);
private static final ExecutorProvider executorProvider =
InstantiatingExecutorProvider.newBuilder().setExecutorThreadCount(4).build();
private static void requireEnvVar(String varName) {
assertNotNull(
"Environment variable " + varName + " is required to perform these tests.",
System.getenv(varName));
}
// Helper function to publish some messages.
private static void publishSomeMessages(Integer numOfMessages) throws Exception {
ProjectTopicName topicName = ProjectTopicName.of(projectId, topicId);
Publisher publisher = Publisher.newBuilder(topicName).build();
List<ApiFuture<String>> messageIdFutures = new ArrayList<>();
for (int i = 0; i < numOfMessages; i++) {
ByteString data = ByteString.copyFromUtf8("Hello " + i);
PubsubMessage pubsubMessage =
PubsubMessage.newBuilder()
.setData(data)
.putAllAttributes(ImmutableMap.of("year", "2020", "author", "unknown"))
.build();
ApiFuture<String> messageIdFuture = publisher.publish(pubsubMessage);
messageIdFutures.add(messageIdFuture);
}
ApiFutures.allAsList(messageIdFutures).get();
}
@Rule public Timeout globalTimeout = Timeout.seconds(600); // 10 minute timeout
@BeforeClass
public static void checkRequirements() {
requireEnvVar("GOOGLE_CLOUD_PROJECT");
}
@Before
public void setUp() throws Exception {
bout = new ByteArrayOutputStream();
out = new PrintStream(bout);
System.setOut(out);
try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
Topic topic = Topic.newBuilder().setName(topicName.toString()).build();
topicAdminClient.createTopic(topic);
}
try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
Subscription subscription =
Subscription.newBuilder()
.setName(subscriptionName.toString())
.setTopic(topicName.toString())
.build();
subscriptionAdminClient.createSubscription(subscription);
}
}
@After
public void tearDown() throws Exception {
try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
subscriptionAdminClient.deleteSubscription(subscriptionName.toString());
}
try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
topicAdminClient.deleteTopic(topicName.toString());
}
System.setOut(null);
}
@Test
public void testSubscriber() throws Exception {
publishSomeMessages(1);
// Test subscribe asynchronously.
SubscribeAsyncExample.subscribeAsyncExample(projectId, subscriptionId);
assertThat(bout.toString()).contains("Data: Hello 0");
publishSomeMessages(1);
bout.reset();
// Test subscribe with custom attributes.
SubscribeWithCustomAttributesExample.subscribeWithCustomAttributesExample(
projectId, subscriptionId);
assertThat(bout.toString()).contains("Data: Hello 0");
assertThat(bout.toString()).contains("author = unknown");
assertThat(bout.toString()).contains("year = 2020");
publishSomeMessages(5);
bout.reset();
// Test subscribe with error listener.
SubscribeWithErrorListenerExample.subscribeWithErrorListenerExample(projectId, subscriptionId);
assertThat(bout.toString()).contains("Data: Hello 0");
publishSomeMessages(200);
bout.reset();
// Test subscribe with flow control settings.
SubscribeWithFlowControlSettingsExample.subscribeWithFlowControlSettingsExample(
projectId, subscriptionId);
for (int i = 0; i < 200; i++) {
assertThat(bout.toString()).contains("Data: Hello " + i);
}
publishSomeMessages(100);
bout.reset();
// Test subscribe with concurrency control.
SubscribeWithConcurrencyControlExample.subscribeWithConcurrencyControlExample(
projectId, subscriptionId);
for (int i = 0; i < 100; i++) {
assertThat(bout.toString()).contains("Data: Hello " + i);
}
publishSomeMessages(3);
bout.reset();
// Test subscribe synchronously.
SubscribeSyncExample.subscribeSyncExample(projectId, subscriptionId, 10);
for (int i = 0; i < 3; i++) {
assertThat(bout.toString()).contains("Hello " + i);
}
publishSomeMessages(3);
bout.reset();
// Test subscribe synchronously with lease management.
SubscribeSyncWithLeaseExample.subscribeSyncWithLeaseExample(projectId, subscriptionId, 10);
for (int i = 0; i < 3; i++) {
assertThat(bout.toString()).contains("Hello " + i);
}
}
}