public final OperationFuture<DvrSession, OperationMetadata> updateDvrSessionAsync(
      DvrSession dvrSession, FieldMask updateMask) {
    UpdateDvrSessionRequest request =
        UpdateDvrSessionRequest.newBuilder()
            .setDvrSession(dvrSession)
            .setUpdateMask(updateMask)
            .build();
    return updateDvrSessionAsync(request);
  }
Updates the specified DVR session.

<p>Sample code:

<pre>{@code
// This snippet has been automatically generated and should be regarded as a code template only.
// It will require modifications to work:
// - It may require correct/in-range values for request initialization.
// - It may require specifying regional endpoints when creating the service client as shown in
// https://cloud.google.com/java/docs/setup#configure_endpoints_for_the_client_library
try (LivestreamServiceClient livestreamServiceClient = LivestreamServiceClient.create()) {
  DvrSession dvrSession = DvrSession.newBuilder().build();
  FieldMask updateMask = FieldMask.newBuilder().build();
  DvrSession response =
      livestreamServiceClient.updateDvrSessionAsync(dvrSession, updateMask).get();
}
}</pre>

@param dvrSession Required. The DVR session resource to be updated.
@param updateMask Required. Field mask is used to specify the fields to be overwritten in the
    DvrSession resource by the update. You can only update the following fields:
    <ul>
      <li>`dvrWindows`
    </ul>
    <p>The fields specified in the update_mask are relative to the resource, not the full
    request. A field will be overwritten if it is in the mask.
@throws com.google.api.gax.rpc.ApiException if the remote call fails
java-video-live-stream/google-cloud-live-stream/src/main/java/com/google/cloud/video/livestream/v1/LivestreamServiceClient.java