import ai.pairsys.goodmem.client.model.*;

// Reading from a streaming response (most common usage)
// PingEvent is deserialized automatically from the stream
Object actual = event.getActualInstance();
if (actual instanceof PingEventOneOf) {
    PingResult result = ((PingEventOneOf) actual).getResult();
} else if (actual instanceof PingEventOneOf1) {
    PingSummary summary = ((PingEventOneOf1) actual).getSummary();
} else if (actual instanceof PingEventOneOf2) {
    PingNotice notice = ((PingEventOneOf2) actual).getNotice();
}