Proposal for supporting cyclic dependencies in dagger2 using Lazy or Provider
Dagger 2.0 currently does not support any kind of dependency cycles.
Dagger 1 allowed this using Lazy<T> or Provider<T> dependency wrapper.
An issue for this was started here: google/dagger#45
I have started with example code found in the issue above exhibiting the problem.
I have copied the dagger generated code, inspected the generated code
and made changes to it and found a way to enable cycles in dependencies using Lazy in the generated code.
Basically Provider<Lazy<Foo>> is passed to Bar_MembersInjector the instead of Provider<Foo>.
By the time when Bar.lazyFoo.get() is called the component's fooProvider is initialized.
The main change can be seen in this commit: https://github.com/kotucz/dagger-lazy-cycle/commit/3a9372af5f085f6a3c11221c424e9fc6fd65c98c
Similar approach could probably be used for Provider<T> dependencies.