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CreateSubscriptionWithDeadLetterPolicyExample.java
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CreateSubscriptionWithDeadLetterPolicyExample.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;
// [START pubsub_dead_letter_create_subscription]
import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
import com.google.pubsub.v1.DeadLetterPolicy;
import com.google.pubsub.v1.ProjectSubscriptionName;
import com.google.pubsub.v1.ProjectTopicName;
import com.google.pubsub.v1.Subscription;
import java.io.IOException;
public class CreateSubscriptionWithDeadLetterPolicyExample {
public static void main(String... args) throws Exception {
// TODO(developer): Replace these variables before running the sample.
String projectId = "your-project-id";
// This is the subscription you want to create with a dead letter policy.
String subscriptionId = "your-subscription-id";
// This is an existing topic that you want to attach the subscription with dead letter policy
// to.
String topicId = "your-topic-id";
// This is an existing topic that the subscription with dead letter policy forwards dead letter
// messages to.
String deadLetterTopicId = "your-dead-letter-topic-id";
CreateSubscriptionWithDeadLetterPolicyExample.createSubscriptionWithDeadLetterPolicyExample(
projectId, subscriptionId, topicId, deadLetterTopicId);
}
public static void createSubscriptionWithDeadLetterPolicyExample(
String projectId, String subscriptionId, String topicId, String deadLetterTopicId)
throws IOException {
try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
ProjectTopicName topicName = ProjectTopicName.of(projectId, topicId);
ProjectSubscriptionName subscriptionName =
ProjectSubscriptionName.of(projectId, subscriptionId);
ProjectTopicName deadLetterTopicName = ProjectTopicName.of(projectId, deadLetterTopicId);
DeadLetterPolicy deadLetterPolicy =
DeadLetterPolicy.newBuilder()
.setDeadLetterTopic(deadLetterTopicName.toString())
// The maximum number of times that the service attempts to deliver a
// message before forwarding it to the dead letter topic. Must be [5-100].
.setMaxDeliveryAttempts(10)
.build();
Subscription request =
Subscription.newBuilder()
.setName(subscriptionName.toString())
.setTopic(topicName.toString())
.setDeadLetterPolicy(deadLetterPolicy)
.build();
Subscription subscription = subscriptionAdminClient.createSubscription(request);
System.out.println("Created subscription: " + subscription.getName());
System.out.println(
"It will forward dead letter messages to: "
+ subscription.getDeadLetterPolicy().getDeadLetterTopic());
System.out.println(
"After "
+ subscription.getDeadLetterPolicy().getMaxDeliveryAttempts()
+ " delivery attempts.");
// Remember to attach a subscription to the dead letter topic because
// messages published to a topic with no subscriptions are lost.
}
}
}
// [END pubsub_dead_letter_create_subscription]