Netty当前的版本:
User guide for 4.x - RECOMMENDED VERSION
User guide for 3.x
User guide for 5.x - ABANDONED VERSION - NOT SUPPORTED
4.x版本是当前官方推荐,4.x版本目前一直在维护中,值得称赞!
3.x版本是比较旧的版本,跟4.x版本相比变化比较大,特别是API。
5.x是被舍弃的版本,官方不再支持!
Netty 5.0以前是发布alpha版。
听到你Netty 5.0不继续开发了,这个是相当大的吃惊,目前也有一部分书籍是基于Netty5来讲的,所以给那些初学者也是很郁闷的赶脚。
为啥呢?看看GitHub上怎么作者怎么回复的吧?
The major change of using a ForkJoinPool increases complexity and has not
demonstrated a clear performance benefit. Also keeping all the branches in sync is quite some work without a real need for it as there is nothin in current master which I think justifies a new major release.
Things that we should investigate to prepare for this change:
-
Deprecate
exceptionCaught
inChannelHandler
, only expose it inChannelInboundHandler
-
Expose
EventExecutorChooser
fromMultithreadEventExecutorGroup
to allow the user more flexibility to choose nextEventLoop
- Add another method to be able to send user events both ways in the pipeline. (#4378)
主要意思:
使用ForkJoinPool增加了复杂性,并且没有显示出明显的性能优势。同时保持所有的分支同步是相当多的工作,没有必要。
详情请看:https://github.com/netty/netty/issues/4466
目前推荐使用的版本是Netty 4.0 or 4.1(我推荐) 。加油,Nettyer 。