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From Matt Hogstrom <m...@hogstrom.org>
Subject Re: When has the server started?
Date Tue, 05 Sep 2006 16:52:41 GMT


Jason Dillon wrote:
> On Sep 4, 2006, at 1:39 PM, David Jencks wrote:
>> IMO this would be a perversion of the geronimo architecture.  What 
>> does "fully started" mean anyway?  If you start with say 
>> geronimo-jetty-minimal and add cars to turn it into a full j2ee server 
>> while it is running, when exactly is it started?  It certainly has 
>> nothing to do with the kernel.
>>

Not to get too pedantic but what if some of the configurations in the persistent configuration

couldn't be started for some reason, is the server still fully started?

Perhaps something more like initialBootstrapCompleted might be more intuitive.

>> When we thought about this last the best idea we could come up with is 
>> that it's "fully started" when all the modules listed in persistent 
>> configuration lists (should be persistent module lists) that are in 
>> the bootstrap or included recursively in those modules are started. 
>> Think about what happens if a module in the original PCL includes 
>> another PCL.
> 
> Started (or fully started) means that the server has loaded, initialized 
> and started all modules in the persistent configuration, such that it 
> could then start to serve applications... and start listening on ports, 
> etc.  True there might be more modules to be loaded or configured after 
> that, but the point is to tell when the server is ready to start 
> accepting work.  There is a period while the server is starting, when it 
> starts listening to http, but it is not ready to serve applications 
> which have been configured to be deployed.
> 
> Anyways, I don't care too much what it is called... but I think that 
> flag should be exposed as a simple Boolean on some common MBean.  Maybe 
> its not the Kernel, as the kernel might be started, but the system might 
> not be ready to serve my webapps or whatever.  Having to pull in 
> geronimo-kernel to perform a simple remote call to fetch a boolean is 
> overkill... especially since that module has magical logging fluff that 
> rudely overwrites configuration.
> 
> If we had a specialized MBean/GBean that just exposed the very common 
> remote functionality via JMX directly then we would be in a very good 
> position to keep tools (IDE plugins, maven plugins, etc) working even 
> after we change the internals around.  Such tools need an easy way to:
> 
>  * Detect when the server is started and ready to server applications
>  * Shutdown
> 
> Probably some other things too...
> 
> --jason
> 
> 
> 
> 

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