[cdi-dev] @ThreadScoped?

[Reza Rahman]

This is essentially in keeping with the minimalist nature of the EE concurrency JSR. I believe most of it is left to vendors to do the right thing for users. May be a good idea is this language can be tightened up.

> On Mar 11, 2016, at 6:01 AM, Mark Struberg <struberg at yahoo.de> wrote:
> E
> From the servlet spec:
> 
> „Java Enterprise Edition features such as Section 15.2.2, “Web Application Environment” on page 15-174 and Section 15.3.1, “Propagation of Security Identity in EJBTM Calls” on page 15-176 are available only to threads executing the initial request or when the request is dispatched to the container via the AsyncContext.dispatch method. Java Enterprise Edition features may be available to other threads operating directly on the response object via the AsyncContext.start(Runnable) method.“
> 
> check „available only to threads executing the initial request“ 
> 
> Also if you look at the servlet AsyncContext then all the wording is written as MAY and not as MUST.
> 
> LieGrue,
> strub
> 
> 
>> Am 10.03.2016 um 19:52 schrieb Romain Manni-Bucau <rmannibucau at gmail.com>:
>> 
>> Hi Mark,
>> 
>> think 2.3.3.4 states the opposite.
>> 
>> 
>> Romain Manni-Bucau
>> @rmannibucau |  Blog | Github | LinkedIn | Tomitriber
>> 
>> 2016-03-10 19:43 GMT+01:00 Mark Struberg <struberg at yahoo.de>:
>> Back from JavaLand conference, so sorry for not kicking in earlier.
>> 
>> I not quite get the argumentation chain. It’s that all triggered by async servlet requests? And isn’t the servlet spec also saying that all the request param etc may max be assigned to a single thread AT A TIME!
>> 
>> Means that it might not be on multiple threads in parallel, but the data is allowed to get moved from one thread to another (disapearing from the first one), right?
>> Would really need to dig into the wording of the async servlets spec again, maybe has this in the back of his head?
>> 
>> LieGrue,
>> strub
>> 
>> 
>> 
>> 
>>> Am 08.03.2016 um 14:43 schrieb Romain Manni-Bucau <rmannibucau at gmail.com>:
>>> 
>>> Hi guys,
>>> 
>>> following request scope thread and to center the discussion on the thread safety part: do we work on this?
>>> 
>>> Background: @RequestScoped is often used as a ThreadLocal instance solution. A lot of SE or Batch implementations rely on it from what I saw as well as async implementations reusing existing business logic with this thread safety constraint.
>>> 
>>> Proposal: providing a @ThreadScoped implementation is cheap for CDI and implemenation and would avoid the headache we can have with @RequestScoped. Will also remove the quite dark side of the spec regarding servlet request and request scope since now we would have a more natural solution for all of these situation so @RequestScoped goals wouldn't collide as much.
>>> 
>>> Questions:
>>> - is it automatically started as request scoped is (JMS, @Async, ...)? Alternative could be some configuration in beans.xml (merged accross the app):
>>> 
>>> <beans>
>>>  <scopes>
>>>    <thread>
>>>      <active>JMS</active>
>>>      <active>ASYNCHONOUS</active>
>>>    </thread>
>>>  </scopes>
>>> </beans>
>>> 
>>> - start/stop API (this is typically an API the user should be able to control for its own threads)
>>> - CDI 2.*0*?
>>> 
>>> wdyt?
>>> 
>>> Romain Manni-Bucau
>>> @rmannibucau |  Blog | Github | LinkedIn | Tomitriber
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>> 
>> 
> 
> 
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