@java.lang.Override
  public int hashCode() {
    if (memoizedHashCode != 0) {
      return memoizedHashCode;
    }
    int hash = 41;
    hash = (19 * hash) + getDescriptor().hashCode();
    if (hasQueue()) {
      hash = (37 * hash) + QUEUE_FIELD_NUMBER;
      hash = (53 * hash) + getQueue().hashCode();
    }
    if (hasUpdateMask()) {
      hash = (37 * hash) + UPDATE_MASK_FIELD_NUMBER;
      hash = (53 * hash) + getUpdateMask().hashCode();
    }
    hash = (29 * hash) + getUnknownFields().hashCode();
    memoizedHashCode = hash;
    return hash;
  }
<pre>
A mask used to specify which fields of the queue are being updated.

If empty, then all fields will be updated.
</pre>

<code>.google.protobuf.FieldMask update_mask = 2;</code>
java-tasks/proto-google-cloud-tasks-v2/src/main/java/com/google/cloud/tasks/v2/UpdateQueueRequest.java