public com.google.cloud.tasks.v2beta2.Queue purgeQueue(
        com.google.cloud.tasks.v2beta2.PurgeQueueRequest request) {
      return io.grpc.stub.ClientCalls.blockingUnaryCall(
          getChannel(), getPurgeQueueMethod(), getCallOptions(), request);
    }
<pre>
Purges a queue by deleting all of its tasks.
All tasks created before this method is called are permanently deleted.
Purge operations can take up to one minute to take effect. Tasks
might be dispatched before the purge takes effect. A purge is irreversible.
</pre>
java-tasks/grpc-google-cloud-tasks-v2beta2/src/main/java/com/google/cloud/tasks/v2beta2/CloudTasksGrpc.java