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Subject: Re: Reuse of code. Global ServerRuntime?
From: Hugi Thordarson <hugi@karlmenn.is>
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Date: Sun, 14 Feb 2016 14:34:51 +0000
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To: user@cayenne.apache.org

Yes. I did, in fact, see that, the first time you wrote it. I=E2=80=99m =
going to get myself some more coffee now.

Thanks,
- hugi


> On 14. feb. 2016, at 14:31, John Huss <johnthuss@gmail.com> wrote:
>=20
> The second method I gave. Just bind the injector to the thread =
earlier.
> On Sun, Feb 14, 2016 at 8:20 AM Hugi Thordarson <hugi@karlmenn.is> =
wrote:
>=20
>> How would you go about creating a new ObjectContext in framework =
code;
>> i.e. in code that doesn=E2=80=99t know anything about the environment =
it=E2=80=99s running
>> in?
>>=20
>>=20
>>> On 14. feb. 2016, at 14:16, John Huss <johnthuss@gmail.com> wrote:
>>>=20
>>> It's your responsibility.
>>>=20
>>> You can't get the runtime that way, but you probably don't need to
>> (except
>>> for your existing code!). The injector has everything you'd need =
except
>> the
>>> runtime itself.
>>> On Sun, Feb 14, 2016 at 8:02 AM Hugi Thordarson <hugi@karlmenn.is>
>> wrote:
>>>=20
>>>> Thanks John, I had no idea getThreadObjectContext() existed. Does
>> Cayenne
>>>> somehow manage this variable or is it solely my responsibility?
>>>>=20
>>>> It isn=E2=80=99t quite exactly what I=E2=80=99m looking for, =
though=E2=80=94ideally, the method
>>>> I=E2=80=99m looking for would be named getProcessServerRuntime().
>>>>=20
>>>> Would CayenneRuntime.getThreadInjector().getInstance(
>> ServerRuntime.class
>>>> ) return the currently operating ServerRuntime?
>>>>=20
>>>> - hugi
>>>>=20
>>>>=20
>>>>=20
>>>>> On 14. feb. 2016, at 13:50, John Huss <johnthuss@gmail.com> wrote:
>>>>>=20
>>>>> If you just need a context and not the runtime you can use:
>>>>>=20
>>>>> BaseContext.getThreadObjectContext();
>>>>>=20
>>>>> as long as you bind one to the thread earlier.
>>>>>=20
>>>>> Or you can use the thread injector to get other stuff like an
>>>>> EntityResolver, or also a context, if you've bound it to a thread:
>>>>> public static ObjectContext newObjectContext() {
>>>>> ObjectContextFactory factory =3D
>>>>>=20
>>>>=20
>> =
CayenneRuntime.getThreadInjector().getInstance(ObjectContextFactory.class)=
;
>>>>> return factory.createContext();
>>>>> }
>>>>>=20
>>>>>=20
>>>>> On Sun, Feb 14, 2016 at 7:19 AM Hugi Thordarson <hugi@karlmenn.is>
>>>> wrote:
>>>>>=20
>>>>>> Hi all.
>>>>>>=20
>>>>>> In almost all of my Cayenne projects, I have a class that holds =
my
>>>>>> ServerRuntime and creates ObjectContexts from that ServerRuntime; =
sort
>>>> of a
>>>>>> central station for my DB connectivity. Works fine, but it means =
my
>>>> code is
>>>>>> somewhat tied to that runtime and calls to
>>>>>> MyCentralCayenneClass.newContext() are littered all over the =
place.
>>>>>>=20
>>>>>> I=E2=80=99m currently writing a lot of unit tests and these use a =
separate
>>>>>> ServerRuntime with a different configuration that connects to a =
test
>>>>>> database. But since some of my code is directly creating contexts =
from
>>>> the
>>>>>> other ServerRuntime (which connects to the production DB) I end =
up
>> with
>>>>>> unintended consequences. Same thing for framework code that=E2=80=99=
s supposed
>>>> to
>>>>>> be reusable=E2=80=94how should it obtain ObjectContexts without =
knowing
>> anything
>>>>>> about the currently active ServerRuntime?
>>>>>>=20
>>>>>> I see several solutions to the situtation but I wanted to start =
out by
>>>>>> checking if there=E2=80=99s a canonical method of solving the =
problem? (I
>>>> believe
>>>>>> I=E2=80=99m actually asking if there=E2=80=99s a way to obtain =
something like a global
>>>>>> currently active ServerRuntime, that can be used by reusable code =
and
>>>>>> tests. But I didn=E2=80=99t want to frame the question in the =
wrong way
>>>> creating an
>>>>>> XY Problem)
>>>>>>=20
>>>>>> Cheers,
>>>>>> - hugi
>>>>=20
>>>>=20
>>=20
>>=20