MQTT---HiveMQ源碼詳解(八)Netty-WebSocket

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基於netty實現Webscoket相對來說就是相當簡單，所以本講中就不搞太複雜的了，給大家看一個類圖，和一段給pipeline添加handler，就可以完全瞭解hivemq如何處理的了，其實跟幾乎所有需要使用netty去支援websocket的處理一致。

public class WebsocketTransportChannelInitializer {    public static final int MAX_CONTENT_LENGTH = 65536;    private final WebsocketListener listener;    public WebsocketTransportChannelInitializer(WebsocketListener listener) {        this.listener = listener;    }    public void initChannel(Channel channel) {//添加http協議編碼/解碼    channel.pipeline().addBefore(Pipelines.ALL_CHANNEL_GROUP_HANDLER, Pipelines.HTTP_SERVER_CODEC, new HttpServerCodec());//添加HttpRequest訊息彙總器        channel.pipeline().addAfter(Pipelines.HTTP_SERVER_CODEC, Pipelines.HTTP_OBJECT_AGGREGATOR, new HttpObjectAggregator(MAX_CONTENT_LENGTH));    //添加WebSocketServerProtocolHandler        String path = this.listener.getPath();        String subProtocols = getSubProtocols();        boolean allowExtensions = this.listener.getAllowExtensions();channel.pipeline().addAfter(Pipelines.HTTP_OBJECT_AGGREGATOR, Pipelines.WEBSOCKET_SERVER_PROTOCOL_HANDLER, new WebSocketServerProtocolHandler(path, subProtocols, allowExtensions, Integer.MAX_VALUE));//添加Websocket位元組碼Handlerchannel.pipeline().addAfter(Pipelines.WEBSOCKET_SERVER_PROTOCOL_HANDLER, Pipelines.WEBSOCKET_BINARY_FRAME_HANDLER, new WebsocketBinaryFrameHandler());//添加websocket框架類型handlerchannel.pipeline().addAfter(Pipelines.WEBSOCKET_BINARY_FRAME_HANDLER, Pipelines.WEBSOCKET_CONTINUATION_FRAME_HANDLER, new WebsocketContinuationFrameHandler());//添加websocket文本handlerchannel.pipeline().addAfter(Pipelines.WEBSOCKET_BINARY_FRAME_HANDLER, Pipelines.WEBSOCKET_TEXT_FRAME_HANDLER, new WebsocketTextFrameHandler());//添加mqtt message轉換成websocketchannel.pipeline().addAfter(Pipelines.WEBSOCKET_TEXT_FRAME_HANDLER, Pipelines.MQTT_WEBSOCKET_ENCODER, new MqttWebsocketEncoder());    }    @VisibleForTesting    String getSubProtocols() {        return Joiner.on(",").join(this.listener.getSubprotocols());    }}

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MQTT---HiveMQ源碼詳解(八)Netty-WebSocket