Re: Startable doesn't has a isRunning() interface ?

[Stephen McConnell]

Jonathan Hawkes wrote:

Perhaps then the container should provide a sort of thread management
component through the ServiceManager.
What I was thinking (before Leo's email) was that the container should 
establish the principal thread and that the thread has specific 
operations that allow the component to comunicate state back to the 
container.  I.e. keep it simple - but keep the container in a command 
and control position.

Stephen.

----- Original Message ----- 
From: "Stephen McConnell" <[EMAIL PROTECTED]>
To: "Avalon Developers List" <[EMAIL PROTECTED]>
Sent: Wednesday, October 08, 2003 12:50 PM
Subject: Re: Startable doesn't has a isRunning() interface ?

 

Jonathan Hawkes wrote:

   

I would say it's the responsibility of the component to act as a
     

container
 

for any threads it starts up.

     

I'm ok with the notion of a container creating threads do its own stuff
- but this is not exactly the same thing as a component starting up a
thread to do its prime objective.  The thing is that seems to me to be a
conflict between the responsibilities of a container to assure service
availablity, and the reopsibility of the component to implement the
service.  Under the current Startable model, the container has no way of
assuring service availablity.  I.e. under the current interfaces its the
component to container communication between startup and shutdown that
remains undefined.
Stephen.

   

Just because a component implements Startable
does not necessarily mean that it is going to allocate its own threads.
(Granted, that will be the case 99.9% of the time.)
----- Original Message ----- 
From: "Stephen McConnell" <[EMAIL PROTECTED]>
To: "Avalon Developers List" <[EMAIL PROTECTED]>
Sent: Wednesday, October 08, 2003 10:53 AM
Subject: Re: Startable doesn't has a isRunning() interface ?



     

Jonathan Hawkes wrote:



       

Yes.  An isRunning() method would not be useful to the container.  The
container knows whether the startable isRunning or not (ie: it has
         

called
 

start() and not stop() ).



         

Yeeees .. but!

Consdider the component in question has been started. The component gets
everything it needs from the container and goes about its business and
       

in
 

the case of a startable component this typically means that the
       

component
 

is creating its own thread of execution.  Assuming that something goes
wrong - there is not contractual interface through which the component
can notify the container that it's execution thread has terminated.
I think the real underlying issue here is component/container
responsibility. Who should be creating and supervising/monitoring the
thread - the component or the container?
Stephen.



       

----- Original Message ----- 
From: "Yannick Menager" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, October 08, 2003 10:17 AM
Subject: Startable doesn't has a isRunning() interface ?





         

Is there any reason Startable doesn't has a isRunning() ( or something
like that ) interface ?


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Stephen J. McConnell
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Stephen J. McConnell
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