@Override
  public UnaryCallable<TransferProto.ListAgentPoolsRequest, ListAgentPoolsPagedResponse>
      listAgentPoolsPagedCallable() {
    return listAgentPoolsPagedCallable;
  }
Constructs an instance of HttpJsonStorageTransferServiceStub, using the given settings. This is
protected so that it is easy to make a subclass, but otherwise, the static factory methods
should be preferred.
java-storage-transfer/google-cloud-storage-transfer/src/main/java/com/google/storagetransfer/v1/proto/stub/HttpJsonStorageTransferServiceStub.java