/
CreateSubscriptionExample.java
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/
CreateSubscriptionExample.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 pubsublite;
// [START pubsublite_create_subscription]
import com.google.api.gax.rpc.AlreadyExistsException;
import com.google.cloud.pubsublite.AdminClient;
import com.google.cloud.pubsublite.AdminClientSettings;
import com.google.cloud.pubsublite.CloudRegion;
import com.google.cloud.pubsublite.CloudRegionOrZone;
import com.google.cloud.pubsublite.CloudZone;
import com.google.cloud.pubsublite.ProjectNumber;
import com.google.cloud.pubsublite.SubscriptionName;
import com.google.cloud.pubsublite.SubscriptionPath;
import com.google.cloud.pubsublite.TopicName;
import com.google.cloud.pubsublite.TopicPath;
import com.google.cloud.pubsublite.proto.Subscription;
import com.google.cloud.pubsublite.proto.Subscription.DeliveryConfig;
import com.google.cloud.pubsublite.proto.Subscription.DeliveryConfig.DeliveryRequirement;
import java.util.concurrent.ExecutionException;
public class CreateSubscriptionExample {
public static void main(String... args) throws Exception {
// TODO(developer): Replace these variables before running the sample.
String cloudRegion = "your-cloud-region";
char zoneId = 'b';
String topicId = "your-topic-id";
String subscriptionId = "your-subscription-id";
long projectNumber = Long.parseLong("123456789");
// True if using a regional location. False if using a zonal location.
// https://cloud.google.com/pubsub/lite/docs/topics
boolean regional = false;
createSubscriptionExample(
cloudRegion, zoneId, projectNumber, topicId, subscriptionId, regional);
}
public static void createSubscriptionExample(
String cloudRegion,
char zoneId,
long projectNumber,
String topicId,
String subscriptionId,
boolean regional)
throws Exception {
CloudRegionOrZone location;
if (regional) {
location = CloudRegionOrZone.of(CloudRegion.of(cloudRegion));
} else {
location = CloudRegionOrZone.of(CloudZone.of(CloudRegion.of(cloudRegion), zoneId));
}
TopicPath topicPath =
TopicPath.newBuilder()
.setProject(ProjectNumber.of(projectNumber))
.setLocation(location)
.setName(TopicName.of(topicId))
.build();
SubscriptionPath subscriptionPath =
SubscriptionPath.newBuilder()
.setLocation(location)
.setProject(ProjectNumber.of(projectNumber))
.setName(SubscriptionName.of(subscriptionId))
.build();
Subscription subscription =
Subscription.newBuilder()
.setDeliveryConfig(
// Possible values for DeliveryRequirement:
// - `DELIVER_IMMEDIATELY`
// - `DELIVER_AFTER_STORED`
// You may choose whether to wait for a published message to be successfully written
// to storage before the server delivers it to subscribers. `DELIVER_IMMEDIATELY` is
// suitable for applications that need higher throughput.
DeliveryConfig.newBuilder()
.setDeliveryRequirement(DeliveryRequirement.DELIVER_IMMEDIATELY))
.setName(subscriptionPath.toString())
.setTopic(topicPath.toString())
.build();
AdminClientSettings adminClientSettings =
AdminClientSettings.newBuilder().setRegion(CloudRegion.of(cloudRegion)).build();
try (AdminClient adminClient = AdminClient.create(adminClientSettings)) {
Subscription response = adminClient.createSubscription(subscription).get();
System.out.println(response.getAllFields() + " created successfully.");
} catch (ExecutionException e) {
try {
throw e.getCause();
} catch (AlreadyExistsException alreadyExists) {
System.out.println("This subscription already exists.");
} catch (Throwable throwable) {
throwable.printStackTrace();
}
}
}
}
// [END pubsublite_create_subscription]