Re: Providers - generation ?

2018-02-12 Thread competitiveprogramming . pietro 
Ah ok, thanks.

On Monday, February 12, 2018 at 12:53:16 PM UTC, scl wrote:
>
> There are many different implementations depending on the scope and the 
> binding.
> An incomplete list is:
> - InjectorImpl.getProviderOrThrow()
> - Scopes.SINGLETON
> - ProviderLookup.getProvider()
> - Providers.of()
> - Providers.gucify()
> In the end it doesn't matter which implementation is actually injected.
>

That is actually my main interest, I am digging into the 
InjectorImpl.getProviderOrThrow() to see where I get. If you have other 
userful links such as the ones you just gave me, feel free!
 

> The main things you need to know is what a provider is good for:
> - Delayed injection (because something is expensive to create or only 
> available in a specific scope)
> - Multiple injection (because you need more than one instance off it. If 
> this is the case think twice if you need DI for this class or rather a 
> factory)
> - Provide your own Provider (if you implement a custom scope)
>
>
> On 12.02.2018 13:38, competitivepro...@gmail.com  wrote:
>
> I was reading that page but I can't find where it explicitly says they are 
> generated. Would you know where the code that generates them is ?
>
> On Monday, February 12, 2018 at 12:32:33 PM UTC, scl wrote: 
>>
>> Yes, Providers are generated on the fly by guice.
>>
>> https://github.com/google/guice/wiki/InjectingProviders
>>
>>
>>
>> On 12.02.2018 13:19, competitivepro...@gmail.com wrote:
>>
>> Hi all, 
>>
>> I apologise if my question sounds silly or badly grounded.
>>
>> I am working on a project which makes intense use of Google Guice and 
>> I've seen several places where the class I am working with uses injected 
>> providers, such as:
>>
>> class WhatEver {
>>   @Inject
>>   WhatEver(Provider providerOfA ...) { ... }
>>
>> }
>>
>> I do not understand how/what implements the provider as I do not see any 
>> class around my module explicitly implementing the interface.
>>
>> Provider
>>
>>
>> I am pretty sure there is not any.
>>
>> How does that work ? Are providers synthesised/generated ? If yes I would 
>> like to see where this is done - so I can have a better idea about how the 
>> whole thing works.
>>
>> Thanks in advance,
>> Pietro.
>>
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>>  
>> 
>> .
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>>
>>
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Re: Providers - generation ?

2018-02-12 Thread Stephan Classen 
There are many different implementations depending on the scope and the 
binding.

An incomplete list is:
- InjectorImpl.getProviderOrThrow()
- Scopes.SINGLETON
- ProviderLookup.getProvider()
- Providers.of()
- Providers.gucify()

In the end it doesn't matter which implementation is actually injected.
The main things you need to know is what a provider is good for:
- Delayed injection (because something is expensive to create or only 
available in a specific scope)
- Multiple injection (because you need more than one instance off it. If 
this is the case think twice if you need DI for this class or rather a 
factory)

- Provide your own Provider (if you implement a custom scope)


On 12.02.2018 13:38, competitiveprogramming.pie...@gmail.com wrote:
I was reading that page but I can't find where it explicitly says they 
are generated. Would you know where the code that generates them is ?


On Monday, February 12, 2018 at 12:32:33 PM UTC, scl wrote:

Yes, Providers are generated on the fly by guice.

https://github.com/google/guice/wiki/InjectingProviders




On 12.02.2018 13:19, competitivepro...@gmail.com  wrote:

Hi all,

I apologise if my question sounds silly or badly grounded.

I am working on a project which makes intense use of Google Guice
and I've seen several places where the class I am working with
uses injected providers, such as:

|
classWhatEver{
@Inject
WhatEver(ProviderproviderOfA ...){...}

}
|

I do not understand how/what implements the provider as I do not
see any class around my module explicitly implementing the interface.

|
Provider
|


I am pretty sure there is not any.

How does that work ? Are providers synthesised/generated ? If yes
I would like to see where this is done - so I can have a better
idea about how the whole thing works.

Thanks in advance,
Pietro.

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Re: Providers - generation ?

2018-02-12 Thread competitiveprogramming . pietro 
I was reading that page but I can't find where it explicitly says they are 
generated. Would you know where the code that generates them is ?

On Monday, February 12, 2018 at 12:32:33 PM UTC, scl wrote:
>
> Yes, Providers are generated on the fly by guice.
>
> https://github.com/google/guice/wiki/InjectingProviders
>
>
>
> On 12.02.2018 13:19, competitivepro...@gmail.com  wrote:
>
> Hi all, 
>
> I apologise if my question sounds silly or badly grounded.
>
> I am working on a project which makes intense use of Google Guice and I've 
> seen several places where the class I am working with uses injected 
> providers, such as:
>
> class WhatEver {
>   @Inject
>   WhatEver(Provider providerOfA ...) { ... }
>
> }
>
> I do not understand how/what implements the provider as I do not see any 
> class around my module explicitly implementing the interface.
>
> Provider
>
>
> I am pretty sure there is not any.
>
> How does that work ? Are providers synthesised/generated ? If yes I would 
> like to see where this is done - so I can have a better idea about how the 
> whole thing works.
>
> Thanks in advance,
> Pietro.
>
> -- 
> You received this message because you are subscribed to the Google Groups 
> "google-guice" group.
> To unsubscribe from this group and stop receiving emails from it, send an 
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> .
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> To view this discussion on the web visit 
> https://groups.google.com/d/msgid/google-guice/df1847bb-6125-434a-b00c-53614000aeb8%40googlegroups.com
>  
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>
>
>

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Providers - generation ?

2018-02-12 Thread competitiveprogramming . pietro 
Hi all,

I apologise if my question sounds silly or badly grounded.

I am working on a project which makes intense use of Google Guice and I've 
seen several places where the class I am working with uses injected 
providers, such as:

class WhatEver {
  @Inject
  WhatEver(Provider providerOfA ...) { ... }

}

I do not understand how/what implements the provider as I do not see any 
class around my module explicitly implementing the interface.

Provider


I am pretty sure there is not any.

How does that work ? Are providers synthesised/generated ? If yes I would 
like to see where this is done - so I can have a better idea about how the 
whole thing works.

Thanks in advance,
Pietro.

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