package test;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.OutputStream;
import java.io.Writer;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

@ServerEndpoint(EchoBasicEndpoint.URL_PATTERN)
public class EchoBasicEndpoint {
    public static final String URL_PATTERN = "/echoBasicEndpoint";

    private static final Logger log = LoggerFactory.getLogger(EchoBasicEndpoint.class);

    Writer writer;
    OutputStream stream;

    @OnMessage
    public void handleStringMessage(final String message, Session session, boolean last) throws IOException {
        if (writer == null) {
            writer = session.getBasicRemote().getSendWriter();
        }
        writer.write(message);
        if (last) {
            writer.close();
            writer = null;
        }
    }

    @OnMessage
    public void handleByteMessage(final byte[] message, Session session, boolean last) throws IOException {
        if (stream == null) {
            stream = session.getBasicRemote().getSendStream();
        }
        stream.write(message);
        stream.flush();
        if (last) {
            stream.close();
            stream = null;
        }
    }

    @OnError
    public void onError(Throwable t) {
        log.warn("WebSockets error message detected", t);
    }
}