@Override
    public synchronized InputStreamReader endHandler(Handler<Void> endHandler) {
        this.endHandler = endHandler;
        return this;
    }
Implementation of vertx {@link io.vertx.core.streams.ReadStream} that wraps {@link java.io.InputStream}.
server/src/main/java/com/epam/aidial/core/server/vertx/stream/InputStreamReader.java