Guice is a dependency injection framework. Its nothing more.
The scenario 1 can be summarized as:
"Run some code once at application startup."
Then do it. Run the code at application startup. Don't try to make Guice
run the code for you.
i.e. in the dropwizard application class there is a method initialize().
For your scenario 2 you want some timer task.
You won't find this in Guice. But there are extensions which provide
such functionality.
One would be: http://onami.apache.org/scheduler/
There are more out there. Pick the one that suits your needs best.
On 09/16/2015 04:20 PM, [email protected] wrote:
Hi,
I am currently working with guice and dropwizard. I am NOT using the
dropwizard-guice dependency since this is somewhat broken with the
latest dropwizard version. Fortunatelly I found a nice tutorial
explaining how to get this set up so I can use guice. I however have
a few issues now, where coming from spring, I am struggling to find
the alternative/best practise for it.
Scenario 1:
I have a bean that simply checks at startup that the schema of my
database is present. I solved this by doing:
@Provides @Singleton public bla() {
// object
// init
}
The issue is, that I now have to run guice in production. I am feeling
that I am abusing the eager singleton creation in production and not
doing the right thing here.
How do I create standalone beans that get created and do some work. In
spring I would create this and then call an init method on it. In
guice I am not sure how to solve this.
Scenario 2:
Timer Tasks that are scheduled or simply threads. E.g. a Monitoring
thread that gets metric in and pokes them to a reporting server once a
minute. I have the same issue here,
i can create the bean, but I can't call run on it. Also, if I am not
in production, since the bean itself is not used anywhere, it won't
get created and won't do any work.
It'd be great if someone could give me some pointer for this :)
Thanks,
Artur
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