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netty之ServerBootstrap和Bootstrap

article 2024/10/28 9:35:16

简介

其作为netty启动引导，配置eventloop以及handler等netty的基础组件

结构

ServerBootstrap

ChannelInitializer：用于在注册完成时添加新连接时的ChannelHandler，其保证只执行一次，不会重复添加

private boolean initChannel(ChannelHandlerContext ctx) throws Exception {
        if (initMap.add(ctx)) { // Guard against re-entrance.
            try {
                initChannel((C) ctx.channel());
            } catch (Throwable cause) {
                // Explicitly call exceptionCaught(...) as we removed the handler before calling initChannel(...).
                // We do so to prevent multiple calls to initChannel(...).
                exceptionCaught(ctx, cause);
            } finally {
                ChannelPipeline pipeline = ctx.pipeline();
                if (pipeline.context(this) != null) {
                    pipeline.remove(this);
                }
            }
            return true;
        }
        return false;
    }