public static final class Empty.Builder extends GeneratedMessageLite.Builder<Empty,Empty.Builder> implements EmptyOrBuilder A generic empty message that you can re-use to avoid defining duplicated
empty messages in your APIs. A typical example is to use it as the request
or the response type of an API method. For instance:
service Foo {
rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
}
The JSON representation for Empty is empty JSON object {}.
Protobuf type google.protobuf.Empty