comonents and spring beans

[Mike Carr-6]

Using Spring Beans as Service Components - http://www.mulesoft.org/display/MULE2USER/Using+Spring+Beans+as+Service+Components

States "We now have beans called restaurantWaiter and kitchenService that will be created by Spring. Notice the resturantWaiter bean scope is set to prototype (by default, all beans in Spring are singletons unless specified otherwise). This is important because Mule will pool your components, and telling Spring not to create a singleton ensures that each pooled instance will be a unique instance.";

Does this imply that MULE will always pool components?

Lets' say I want to create a pool...

What if I have another bean that was used resturantWaiter, presumably I'd have to make that prototype as well?

If I had another bean that used restaurantWaiter outside of MULE should I create a second bean e.g. restaurantWaiterSingleton to serve that; so I have a restaurantWaiterPrototype and a restaurantWaiterSingleton?

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[Dirk Olmes]

David O'Brien wrote:
> States "We now have beans called restaurantWaiter and kitchenService
> that will be created by Spring. Notice the resturantWaiter bean scope
> is set to prototype (by default, all beans in Spring are singletons
> unless specified otherwise). This is important because Mule will pool
> your components, and telling Spring not to create a singleton ensures
> that each pooled instance will be a unique instance.";
>
> Does this imply that MULE will always pool components?

Yes.

> Lets' say I want to create a pool...
>
> What if I have another bean that was used resturantWaiter, presumably
> I'd have to make that prototype as well?

Makes the most sense. With Spring's default scope (singleton) you'll end
up with a pool full of the same singleton. See
http://www.mulesoft.org/jira/browse/MULE-4514 for some discussion around
this topic.

-dirk

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[Mike Carr-6]

Mule In Action seems to give the opposite impression 6.3.3 Handling workload with a pool

It suggests that components are not pooled by default.

I'm assuming you are correct and the book is wrong.

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[David Dossot-3]

> States "We now have beans called restaurantWaiter and kitchenService
> that will be created by Spring. Notice the resturantWaiter bean scope
> is set to prototype (by default, all beans in Spring are singletons
> unless specified otherwise). This is important because Mule will pool
> your components, and telling Spring not to create a singleton ensures
> that each pooled instance will be a unique instance.";
>
> Does this imply that MULE will always pool components?

Yes.

I'm really surprised by this response.

I thought you have to do this to get Spring prototype beans to be pooled:

  <pooled-component>


    <spring-object bean="restaurantWaiter"/>
  </pooled-component>

Are you saying that this:

  <component>
    <spring-object bean="creditAgencyEJB" /> 
  </component>

will also pool the Spring prototype instances?

If that's the case, how do you control the pool size?

Thanks for the precision. We will issue a book erratum if accordingly.

Cheers,
D.

[Daniel Feist]

> States "We now have beans called restaurantWaiter and kitchenService
> that will be created by Spring. Notice the resturantWaiter bean scope
> is set to prototype (by default, all beans in Spring are singletons
> unless specified otherwise). This is important because Mule will pool
> your components, and telling Spring not to create a singleton ensures
> that each pooled instance will be a unique instance.";
>
> Does this imply that MULE will always pool components?

Yes.

I'm really surprised by this response.

Me too!  Back in Mule 1.3 and 1.4 Mule used to pool your components by default unless you turned off that functionality, but in 2.0->  it is a bit more explicit and two different xml elements are used.

<component> = no-pooling

<pooled-component> = pooling

My guess is that the documentation you referenced was updated from 1.4 documentation and that slipped through.

I have updated the docs, please review: http://www.mulesoft.org/pages/diffpages.action?pageId=9765435&originalId=26706278

sorry for the confusion,

Dan

[Steve A.]

Just to clarify, is this the case for <scripting:component> too?

Steve

Dirk Olmes wrote:

David O'Brien wrote:
> Does this imply that MULE will always pool components?

Yes.

[Steve A.]

Just to clarify, is this the case for too? Steve

Dirk Olmes wrote:

David O'Brien wrote: > Does this imply that MULE will always pool components? Yes.

[Steve A.]

I'm not sure what happened with my previous reply, but please disregard.

However, what I meant to ask was are scripting components pooled or not by default?

Steve

Dirk Olmes wrote:

> Does this imply that MULE will always pool components?

Yes.

[Steve A.]

So, was this a stupid question or hard question? :-)

Steve

Just to clarify, is this the case for <scripting:component> too?

Steve

Dirk Olmes wrote:

David O'Brien wrote:
> Does this imply that MULE will always pool components?

Yes.

[antoine.borg]

I've never done this with a scripting component but my understanding is
that it's still a component so the answer would be "yes it is"

My 2c worth.

A

Steve A. wrote:

> So, was this a stupid question or hard question? :-)
>
> Steve
>
> Steve A. wrote:
>  
>> Just to clarify, is this the case for <scripting:component> too?
>>
>> Steve
>>
>>
>> Dirk Olmes wrote:
>>    
>>> David O'Brien wrote:
>>>      
>>>> Does this imply that MULE will always pool components?
>>>>        
>>> Yes.
>>>
>>>
>>>      
>>    
>
>  

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