I want to know whether kapt support incremental bu...
# androids
Sangeet
07/31/2018, 12:44 PMI want to know whether kapt support incremental build and dagger supports that ?
g
gildor
07/31/2018, 1:16 PMNo
gildor
07/31/2018, 1:17 PMThis is not even a problem of Kapt. Jsr269 doesn't provide any facilities for incremental compilation
gildor
07/31/2018, 1:20 PMBut guys from Gradle have experimental API that provides such tools and works for jsr269 compatible annotation processors, but requires integration from annotation processors
For example this is a thread about this on Dagger issue tracker
https://github.com/google/dagger/issues/1120
s
Sangeet
07/31/2018, 1:58 PM@gildor Okay. So even android data binding doesn’t support that. The problem is in multi module project, it’s kind of increasing build time.
g
gildor
07/31/2018, 1:59 PMNobody supports this, because technology itself doesn't provide way to support it
gildor
07/31/2018, 2:01 PMActually DataBinding library has pretty powerful incremental part of compiler with caches and so on, but they still depend on jsr269 and cannot make compilation completely incremental
gildor
07/31/2018, 2:06 PMDataBinding team also works on this problem and probably implement solution from Gradle (people from Google also work together with Gradle on this project)
s
Sangeet
07/31/2018, 2:07 PMOkay got it. The problem I figured it is that kapt is not getting cached. If you change in some class which doesn’t have annotations, kapt for that module is getting triggered and it’s taking lot of time.
g
gildor
07/31/2018, 2:08 PMNo, it's not the source of the problem
gildor
07/31/2018, 2:09 PMYou cannot process classes only with annotations, because annotation processor can generate code even based on classes without annotations or not for classes at all. Like in case of DataBinding, you generate code based on xml layouts
gildor
07/31/2018, 2:10 PMIn case of multimodule project situation is actually better, because if you have good graph of modules and properly configured annotation processors that isolated by a single module, you will get recompilation only changed module instead of whole project
gildor
07/31/2018, 2:11 PMAnd as I said, it's not only a problem of KAPT, but also APT from Java, has exactly the same problem
s
Sangeet
07/31/2018, 2:20 PMOkay. So I think it’s better to not use any annotations at all.