Re: Cayenne And SpringBoot

> Cayenne is pretty generic as far as integrations go - it should work well
> and easily with any framework. 

Yep.

>> Has anyone done this before?  Are there any  suggestions  on what I should
>> be certain to do or avoid? Should I just spin up the standard Cayenne web
>> filter?  Are there other choices?


It's been 3 years since I tried SpringBoot, so I don't remember all the classes involved. But at the high level the approach should be the same as with Bootique:

1. Bind ServerRuntime as an injectable *singleton* 
2. Figure out how to scope ObjectContexts based on the app specifics.

I'd actually avoid CayenneFilter. It is too servlet-specific and favors session scope for the context. My typical pattern for #2 is creating a simple custom service like this:

public interface ICayenneService {
  ObjectContext sharedContext();
  ObjectContext newContext();
}

It provides user-friendly API around ServerRuntime, and you inject it everywhere you need a context. You'd use "sharedContext" for reads, and "newContext" for writes.

Also just found this on GitHub [1]. Not sure how legit it is. But posting our own "canonical" SpringBoot example is probably a good idea.

Andrus

[1] https://github.com/Softmotions/spring-boot-starter-cayenne

> On Aug 13, 2019, at 7:56 PM, John Huss <[email protected]> wrote:
> 
> Cayenne is pretty generic as far as integrations go - it should work well
> and easily with any framework. Just create your ServerRuntime and define a
> way to retrieve it (using ServletContext.setAttribute is typical). Then
> you'll want to bind the runtime to each request that comes in, which is all
> that CayenneFilter does. If CayenneFilter has worked for you, then just use
> that. CayenneFilter is very minimal so you copy it and customize it if
> needed.
> 
> On Tue, Aug 13, 2019 at 11:29 AM Tony Giaccone <[email protected]> wrote:
> 
>> I want to look into using Cayenne with SpringBoot.  I was able to get a
>> basic cayenne stack up and running by implementing a ContextListener  and
>> on the create event starting up a Cayenne Runtime.  I was using an in
>> memory database and I had problems getting the ;create=true working.  My
>> hack was to set the strategy on the DataNode after the runtime after it
>> was  spun up.
>> 
>> Has anyone done this before?  Are there any  suggestions  on what I should
>> be certain to do or avoid? Should I just spin up the standard Cayenne web
>> filter?  Are there other choices?
>> 
>> Thanks for any help you can provide.
>> 
>> 
>> Tony
>>