public Builder mergePullMessage(com.google.cloud.tasks.v2beta2.PullMessage value) {
      if (pullMessageBuilder_ == null) {
        if (payloadTypeCase_ == 4
            && payloadType_ != com.google.cloud.tasks.v2beta2.PullMessage.getDefaultInstance()) {
          payloadType_ =
              com.google.cloud.tasks.v2beta2.PullMessage.newBuilder(
                      (com.google.cloud.tasks.v2beta2.PullMessage) payloadType_)
                  .mergeFrom(value)
                  .buildPartial();
        } else {
          payloadType_ = value;
        }
        onChanged();
      } else {
        if (payloadTypeCase_ == 4) {
          pullMessageBuilder_.mergeFrom(value);
        } else {
          pullMessageBuilder_.setMessage(value);
        }
      }
      payloadTypeCase_ = 4;
      return this;
    }
<pre>
[LeaseTasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks] to process
the task. Can be set only if
[pull_target][google.cloud.tasks.v2beta2.Queue.pull_target] is set on the
queue.

A pull task is a task that has
[PullMessage][google.cloud.tasks.v2beta2.PullMessage] set.
</pre>

<code>.google.cloud.tasks.v2beta2.PullMessage pull_message = 4;</code>
java-tasks/proto-google-cloud-tasks-v2beta2/src/main/java/com/google/cloud/tasks/v2beta2/Task.java