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channelRead0() — netty Function Reference

Architecture documentation for the channelRead0() function in WebSocketClientHandler.java from the netty codebase.

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Entity Profile

Dependency Diagram

graph TD
  8d27d58c_751d_7c61_94ea_2f07994ed4ca["channelRead0()"]
  224c67d9_4aa5_5e3b_7392_068d6abd4f25["WebSocketClientHandler"]
  8d27d58c_751d_7c61_94ea_2f07994ed4ca -->|defined in| 224c67d9_4aa5_5e3b_7392_068d6abd4f25
  style 8d27d58c_751d_7c61_94ea_2f07994ed4ca fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

example/src/main/java/io/netty/example/http/websocketx/client/WebSocketClientHandler.java lines 82–114

    @Override
    public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
        Channel ch = ctx.channel();
        if (!handshaker.isHandshakeComplete()) {
            try {
                handshaker.finishHandshake(ch, (FullHttpResponse) msg);
                System.out.println("WebSocket Client connected!");
                handshakeFuture.setSuccess();
            } catch (WebSocketHandshakeException e) {
                System.out.println("WebSocket Client failed to connect");
                handshakeFuture.setFailure(e);
            }
            return;
        }

        if (msg instanceof FullHttpResponse) {
            FullHttpResponse response = (FullHttpResponse) msg;
            throw new IllegalStateException(
                    "Unexpected FullHttpResponse (getStatus=" + response.status() +
                            ", content=" + response.content().toString(CharsetUtil.UTF_8) + ')');
        }

        WebSocketFrame frame = (WebSocketFrame) msg;
        if (frame instanceof TextWebSocketFrame) {
            TextWebSocketFrame textFrame = (TextWebSocketFrame) frame;
            System.out.println("WebSocket Client received message: " + textFrame.text());
        } else if (frame instanceof PongWebSocketFrame) {
            System.out.println("WebSocket Client received pong");
        } else if (frame instanceof CloseWebSocketFrame) {
            System.out.println("WebSocket Client received closing");
            ch.close();
        }
    }

Domain

Subdomains

Defined In

Source

Frequently Asked Questions

What does channelRead0() do?
channelRead0() is a function in the netty codebase, defined in example/src/main/java/io/netty/example/http/websocketx/client/WebSocketClientHandler.java.
Where is channelRead0() defined?
channelRead0() is defined in example/src/main/java/io/netty/example/http/websocketx/client/WebSocketClientHandler.java at line 82.

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