+1 On 18/07/2019 14:25, Matthieu Baechler wrote: > Hi community, > > I've been working on the subject of the build time for James lately. > > TL;DR; > > I'd like to require JDK-11 as the default compiler for James to use the > `-release` flag to fasten the build (while still targeting Java 8 for > now) and drop animal-sniffer plugin. > > Long version: > > James is very modular. I mean, there are more than 200 modules to build > because of the hexagonal architecture we implement. > > Maybe it would make sense to describe a bit this design decision, I > don't think it has been done publicly before and implicit decision > record is usually a bad idea. > > The problem is the following: > > We want James to be able to support various kind of technologies > because it's at the same time a standalone mail server, a mail > service that you can embed, a set of libraries you can reuse and a > mail processing framework. > > We would like it to be useful at the same time for single user > instances and for million users instance. > > The design decision: > > Keep domain code clean, that is, not depending on a given > technology, so that we can switch non-core-domain modules when we > need a new technology. That's basically what Hexagonal Architecture > (or Onion Architecture, or Clean Architecture) is all about. > > Consequence: > > For each non-core-domain requirements of a given module we introduce > an api module (something-api) to describe these requirements. > > We also provide a contract testsuite in api so that all > implementations have (as much as possible) a similar behavior. > > Then we implement at least two modules for any api: a memory one > that uses java datastructure as ArrayList or HashMap and a second > (more useful) one using the technology of the day. > > So any requirements means 3 more projects. > > That's what led us to a 200+ modules project and a slow build. > > One thing I found is that using the animal-sniffer maven plugin is kind > of slow on James. > > animal-sniffer is a plugin that checks, when we target java 8, that not > only we respect the language specification but we also use only jdk8 > APIs. > > Hopefully, this feature were added in java 9 openjdk compiler with the > `-release` flag and it's way faster than animal-sniffer. > > Then we finally come to my proposal: > > I'd like to require JDK-11 as the default compiler for James to use > the `-release` flag to fasten the build (while still targeting Java > 8 for now) and drop animal-sniffer plugin. > > In the (very near) future, we'll discuss the switch to Java 11 as a > runtime platform, too, but it's not the proposal I make here. > > > I do propose a vote to ensure consensus on it: > - Answer this mail with "+1" to require jdk-11 as build tool > - Answer this mail with "-1" to reject the idea > > Regards, >
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