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Posted to commits@rocketmq.apache.org by GitBox <gi...@apache.org> on 2022/11/12 02:14:11 UTC
[GitHub] [rocketmq] ShadowySpirits commented on issue #5462: About RemotingCommand.decode parse header is a repeated calculation
ShadowySpirits commented on issue #5462:
URL: https://github.com/apache/rocketmq/issues/5462#issuecomment-1312319073
> > > in org.apache.rocketmq.remoting.protocol.RemotingCommand.decode method，Through ByteBuf calculate command header is a repeated operation 
> >
> >
> > This is not a repeated operation. This operation is to solve the problem of java coding. You can search for "the meaning of doing 0xFFFFF & operation" with the browser~
>
> Can you tell me the meaning of doing 0xFFFFFF & operation？I tried to search the browser but didn't find the relevant results.please.
We use byte(0-255) to transfer data via network. But java doesn't support unsigned int, so we should use 0xFFFFFF & operation to get unsigned int. See [this blog (Chinese ver)](https://blog.lv5.moe/p/the-mathematical-principle-of-ones-complement-and-twos-complement) for more info about how could we do this.
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