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Brian Clozel
17abb4d25d
Prior to this commit, WebFlux had Protobuf codecs for managing the `Message`/`"application/x-protobuf"` encoding and decoding. The `com.google.protobuf:protobuf-java-util` library has additional support for JSON (de)serialization, but this is not supported by existing codecs. This commit adds the new `ProtobufJsonEncode` and `ProtobufJsonDecoder` classes that support this use case. Note, the `ProtobufJsonDecoder` has a significant limitation: it cannot decode JSON arrays as `Flux<Message>` because there is no available non-blocking parser able to tokenize JSON arrays into streams of `Databuffer`. Instead, applications should decode to `Mono<List<Message>>` which causes additional buffering but is properly supported. Closes gh-25457