import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
+/**
+ * {@link WebSocketServerHandler} is implementation of
+ * {@link SimpleChannelInboundHandler} which allow handle
+ * {@link FullHttpRequest} and {@link WebSocketFrame} messages.
+ */
public class WebSocketServerHandler extends SimpleChannelInboundHandler<Object> {
- private static final Logger logger = LoggerFactory.getLogger(WebSocketServerHandler.class);
+ private static final Logger logger = LoggerFactory
+ .getLogger(WebSocketServerHandler.class);
private WebSocketServerHandshaker handshaker;
@Override
- protected void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
+ protected void channelRead0(ChannelHandlerContext ctx, Object msg)
+ throws Exception {
if (msg instanceof FullHttpRequest) {
handleHttpRequest(ctx, (FullHttpRequest) msg);
} else if (msg instanceof WebSocketFrame) {
}
}
- private void handleHttpRequest(ChannelHandlerContext ctx, FullHttpRequest req)
- throws Exception {
+ /**
+ * Checks if HTTP request method is GET and if is possible to decode HTTP
+ * result of request.
+ *
+ * @param ctx
+ * ChannelHandlerContext
+ * @param req
+ * FullHttpRequest
+ */
+ private void handleHttpRequest(ChannelHandlerContext ctx,
+ FullHttpRequest req) throws Exception {
// Handle a bad request.
if (!req.getDecoderResult().isSuccess()) {
- sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST));
+ sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1,
+ BAD_REQUEST));
return;
}
// Allow only GET methods.
if (req.getMethod() != GET) {
- sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN));
+ sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1,
+ FORBIDDEN));
return;
}
listener.addSubscriber(ctx.channel());
logger.debug("Subscriber successfully registered.");
} else {
- logger.error("Listener for stream with name '{}' was not found.", streamName);
- sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, INTERNAL_SERVER_ERROR));
+ logger.error("Listener for stream with name '{}' was not found.",
+ streamName);
+ sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1,
+ INTERNAL_SERVER_ERROR));
}
// Handshake
getWebSocketLocation(req), null, false);
handshaker = wsFactory.newHandshaker(req);
if (handshaker == null) {
- WebSocketServerHandshakerFactory.sendUnsupportedWebSocketVersionResponse(ctx.channel());
+ WebSocketServerHandshakerFactory
+ .sendUnsupportedWebSocketVersionResponse(ctx.channel());
} else {
handshaker.handshake(ctx.channel(), req);
}
}
+ /**
+ * Checks response status, send response and close connection if necessary
+ *
+ * @param ctx
+ * ChannelHandlerContext
+ * @param req
+ * HttpRequest
+ * @param res
+ * FullHttpResponse
+ */
private static void sendHttpResponse(ChannelHandlerContext ctx,
HttpRequest req, FullHttpResponse res) {
// Generate an error page if response getStatus code is not OK (200).
if (res.getStatus().code() != 200) {
- ByteBuf buf = Unpooled.copiedBuffer(res.getStatus().toString(), CharsetUtil.UTF_8);
+ ByteBuf buf = Unpooled.copiedBuffer(res.getStatus().toString(),
+ CharsetUtil.UTF_8);
res.content().writeBytes(buf);
buf.release();
setContentLength(res, res.content().readableBytes());
}
}
- private void handleWebSocketFrame(ChannelHandlerContext ctx, WebSocketFrame frame) throws IOException {
+ /**
+ * Handles web socket frame.
+ *
+ * @param ctx
+ * {@link ChannelHandlerContext}
+ * @param frame
+ * {@link WebSocketFrame}
+ */
+ private void handleWebSocketFrame(ChannelHandlerContext ctx,
+ WebSocketFrame frame) throws IOException {
if (frame instanceof CloseWebSocketFrame) {
- handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain());
- String streamName = Notificator.createStreamNameFromUri(((CloseWebSocketFrame) frame).reasonText());
+ handshaker.close(ctx.channel(),
+ (CloseWebSocketFrame) frame.retain());
+ String streamName = Notificator
+ .createStreamNameFromUri(((CloseWebSocketFrame) frame)
+ .reasonText());
ListenerAdapter listener = Notificator.getListenerFor(streamName);
if (listener != null) {
listener.removeSubscriber(ctx.channel());
Notificator.removeListenerIfNoSubscriberExists(listener);
return;
} else if (frame instanceof PingWebSocketFrame) {
- ctx.channel().write(new PongWebSocketFrame(frame.content().retain()));
+ ctx.channel().write(
+ new PongWebSocketFrame(frame.content().retain()));
return;
}
}
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
if (cause instanceof java.nio.channels.ClosedChannelException == false) {
- //cause.printStackTrace();
+ // cause.printStackTrace();
}
ctx.close();
}
+ /**
+ * Get web socket location from HTTP request.
+ *
+ * @param req
+ * HTTP request from which the location will be returned
+ * @return String representation of web socket location.
+ */
private static String getWebSocketLocation(HttpRequest req) {
return "http://" + req.headers().get(HOST) + req.getUri();
}