6.5 Summary

In this chapter you got an in-depth look into how Netty allows hooking into data processing with its ChannelHandler implementation. The chapter shows how ChannelHandlers are chained and how the ChannelPipeline uses them. It highlighted the differences between inbound and outbound handlers and the differences in operating on bytes or messages of various types.

In the next chapter I
ll focus on the codec abstraction of Netty, which makes writing codecs much easier than using raw ChannelHandler interfaces. Also, I
ll take a deeper look at how you can easily test your ChannelHandler implementations.