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channelRead0() — netty Function Reference

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

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Entity Profile

Dependency Diagram

graph TD
  75dd4498_92e9_299c_8cbd_96979ba3d8df["channelRead0()"]
  009d4a05_460c_38db_f8c2_4f86c852162c["WebSocketFrameHandler"]
  75dd4498_92e9_299c_8cbd_96979ba3d8df -->|defined in| 009d4a05_460c_38db_f8c2_4f86c852162c
  style 75dd4498_92e9_299c_8cbd_96979ba3d8df fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

example/src/main/java/io/netty/example/http/websocketx/server/WebSocketFrameHandler.java lines 31–43

    @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);
        }
    }

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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/server/WebSocketFrameHandler.java.
Where is channelRead0() defined?
channelRead0() is defined in example/src/main/java/io/netty/example/http/websocketx/server/WebSocketFrameHandler.java at line 31.

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