Re: Entries, ServiceTemplates, and JavaSpaces

> What prompted the thoughts of changing to a JavaSpace?  This 
> could be important to solving the problem the "right" way....

We wanted to have agents working jobs distributed from a master
process after which they would be returned to the master. Seemed like
the usual use-case for JavaSpaces.

> > With JavaSpaces it seems we lose the ability to register for 
> > notification via a ServiceTemplate, and instead must offer a
single 
> > Entry instance with a pre-defined set of fields. First 
> question then:
> > does my grasp of the situation seem correct? Second: Is 
> there no way 
> > at runtime to configure an Entry with dynamic properties?
> >
> 
> Yes,  you're correct.
> 
> Can't think of a way to do the dynamic properties thing - 
> were you matching on a subset of an Agent's Entry attributes 
> or all attributes?

The idea was that I could configure properties from the master that
would be a subset of an agent's properties. That is, the agent would
fully describe its capabilities and the master would pick the subset
it cared about. Specifically, we might specify a version of Java or an
OS or a even a hostname. In fact, these three properties were
automatically set on our agents but the user could optionally add more
properties in a standard properties file.

> > Alternatively the agents can register for notification of a
generic 
> > Entry's appearance at which point they can check a Map on the
Entry 
> > for matching criteria. I'm sure this has been done? Sounds 
> like a bit 
> > of a pain, though, to implement one's own matching 
> criteria--is there 
> > something already written to do this and is this the 
> recommended way 
> > to do what we're trying to do?
> >
> 
> I can think of a few possibilties but I'd prefer not to waste 
> your time with them until I know a bit more about why you 
> want to do this.

Understood. Fire away!

> Happy Easter,

Same to you, Dan!

> Dan.

Jeff

| Jeff Ramsdale |
|   SolutionsIQ |
|  Bellevue, WA |
 

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