Circular Dependency

[Philip Tomlinson <ph...@pot.co.nz>]

Hi,

I have a mailet in which I want to schedule a job.
I am using James 2.2.0.

I have found the fulcrum-quartz package which shows how to configure the 
quartz scheduler in an avalon container.

I have added in a new block into the assembly.xml for the quartz 
scheduler and added it into the James block as a provider.
Now in a mailet I can schedule a job.

However I want the job to send an email.

I have tried adding in a the James block as a provide of the quartz 
block I defined (and added in the dependency in the .xinfo) file.

Now I have a circular dependency which the server duly tells me.

In the case where I have 2 blocks that "use" the services of each other, 
how can one set up the assembly.xml and .xinfo files to facilitate this
and avoid the circular dependency.
I cant see how to do it other than using the service method in the 
container (James) to potentially set itself into the component 
(QuartzScheduler).
Is there a better way?

Rgds,
Phil

-------------------------
Philip Tomlinson
PJT Consulting
Email: phil@pot.co.nz
Mobile: 021 707 385




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Re: Circular Dependency

[Stefano Bagnara <ap...@bago.org>]

The mailet is a multithreaded component started at james initialization 
and disposed just before the james stop.
You can create the scheduler just inside the Mailet with no need to use 
an avalon-component.

The fulcrum-quartz package is useful if you need to schedule processes 
in the container not starting from the mailet.

Stefano

Philip Tomlinson wrote:
> Hi,
> 
> I have a mailet in which I want to schedule a job.
> I am using James 2.2.0.
> 
> I have found the fulcrum-quartz package which shows how to configure the 
> quartz scheduler in an avalon container.
> 
> I have added in a new block into the assembly.xml for the quartz 
> scheduler and added it into the James block as a provider.
> Now in a mailet I can schedule a job.
> 
> However I want the job to send an email.
> 
> I have tried adding in a the James block as a provide of the quartz 
> block I defined (and added in the dependency in the .xinfo) file.
> 
> Now I have a circular dependency which the server duly tells me.
> 
> In the case where I have 2 blocks that "use" the services of each other, 
> how can one set up the assembly.xml and .xinfo files to facilitate this
> and avoid the circular dependency.
> I cant see how to do it other than using the service method in the 
> container (James) to potentially set itself into the component 
> (QuartzScheduler).
> Is there a better way?
> 
> Rgds,
> Phil


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