/
ListTopicsExample.java
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/
ListTopicsExample.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_list_topics]
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.LocationPath;
import com.google.cloud.pubsublite.ProjectNumber;
import com.google.cloud.pubsublite.proto.Topic;
import java.util.List;
public class ListTopicsExample {
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';
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 = true;
listTopicsExample(cloudRegion, zoneId, projectNumber, regional);
}
public static void listTopicsExample(
String cloudRegion, char zoneId, long projectNumber, boolean regional) throws Exception {
AdminClientSettings adminClientSettings =
AdminClientSettings.newBuilder().setRegion(CloudRegion.of(cloudRegion)).build();
CloudRegionOrZone location;
if (regional) {
location = CloudRegionOrZone.of(CloudRegion.of(cloudRegion));
} else {
location = CloudRegionOrZone.of(CloudZone.of(CloudRegion.of(cloudRegion), zoneId));
}
LocationPath locationPath =
LocationPath.newBuilder()
.setProject(ProjectNumber.of(projectNumber))
.setLocation(location)
.build();
try (AdminClient adminClient = AdminClient.create(adminClientSettings)) {
List<Topic> topics = adminClient.listTopics(locationPath).get();
for (Topic topic : topics) {
System.out.println(topic.getAllFields());
}
System.out.println(topics.size() + " topic(s) listed.");
}
}
}
// [END pubsublite_list_topics]