io.netty.example.http.websocketx.server.WebSocketFrameHandler Maven / Gradle / Ivy
/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.example.http.websocketx.server;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import java.util.Locale;
/**
* Echoes uppercase content of text frames.
*/
public class WebSocketFrameHandler extends SimpleChannelInboundHandler {
@Override
protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception {
// ping and pong frames already handled
if (frame instanceof TextWebSocketFrame) {
// Send the uppercase string back.
String request = ((TextWebSocketFrame) frame).text();
ctx.channel().writeAndFlush(new TextWebSocketFrame(request.toUpperCase(Locale.US)));
} else {
String message = "unsupported frame type: " + frame.getClass().getName();
throw new UnsupportedOperationException(message);
}
}
}