/
SeekSubscriptionExample.java
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/
SeekSubscriptionExample.java
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/*
* Copyright 2021 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_seek_subscription]
import com.google.api.gax.longrunning.OperationFuture;
import com.google.cloud.pubsublite.AdminClient;
import com.google.cloud.pubsublite.AdminClientSettings;
import com.google.cloud.pubsublite.BacklogLocation;
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.SeekTarget;
import com.google.cloud.pubsublite.SubscriptionName;
import com.google.cloud.pubsublite.SubscriptionPath;
import com.google.cloud.pubsublite.proto.OperationMetadata;
import com.google.cloud.pubsublite.proto.SeekSubscriptionResponse;
public class SeekSubscriptionExample {
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';
// Choose an existing subscription.
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;
// Choose a target location within the message backlog to seek a subscription to.
// Possible values for SeekTarget:
// - SeekTarget.of(BacklogLocation.BEGINNING): replays from the beginning of all retained
// messages.
// - SeekTarget.of(BacklogLocation.END): skips past all current published messages.
// - SeekTarget.ofPublishTime(<timestamp>): delivers messages with publish time greater than
// or equal to the specified timestamp.
// - SeekTarget.ofEventTime(<timestamp>): seeks to the first message with event time greater
// than or equal to the specified timestamp.
SeekTarget target = SeekTarget.of(BacklogLocation.BEGINNING);
// Optional: Wait for the seek operation to complete, which indicates when subscribers for all
// partitions are receiving messages from the seek target. If subscribers are offline, the
// operation will complete once they are online.
boolean waitForOperation = false;
seekSubscriptionExample(
cloudRegion, zoneId, projectNumber, subscriptionId, target, waitForOperation, regional);
}
public static void seekSubscriptionExample(
String cloudRegion,
char zoneId,
long projectNumber,
String subscriptionId,
SeekTarget target,
boolean waitForOperation,
boolean regional)
throws Exception {
CloudRegionOrZone location;
if (regional) {
location = CloudRegionOrZone.of(CloudRegion.of(cloudRegion));
} else {
location = CloudRegionOrZone.of(CloudZone.of(CloudRegion.of(cloudRegion), zoneId));
}
SubscriptionPath subscriptionPath =
SubscriptionPath.newBuilder()
.setLocation(location)
.setProject(ProjectNumber.of(projectNumber))
.setName(SubscriptionName.of(subscriptionId))
.build();
AdminClientSettings adminClientSettings =
AdminClientSettings.newBuilder().setRegion(CloudRegion.of(cloudRegion)).build();
try (AdminClient adminClient = AdminClient.create(adminClientSettings)) {
// Initiate an out-of-band seek for a subscription to the specified target. If an operation
// is returned, the seek has been successfully registered and will eventually propagate to
// subscribers.
OperationFuture<SeekSubscriptionResponse, OperationMetadata> seekFuture =
adminClient.seekSubscription(subscriptionPath, target);
System.out.println("Seek operation " + seekFuture.getName() + " initiated successfully.");
if (waitForOperation) {
System.out.println("Waiting for operation to complete...");
seekFuture.get();
System.out.println("Operation completed. Metadata:\n" + seekFuture.getMetadata().get());
}
}
}
}
// [END pubsublite_seek_subscription]