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MASON-INTEREST-L  March 2011

MASON-INTEREST-L March 2011

Subject:

Re: SimState: constructor does not accept modified Schedule

From:

Sean Luke <[log in to unmask]>

Reply-To:

MASON Multiagent Simulation Toolkit <[log in to unmask]>

Date:

Tue, 22 Mar 2011 08:15:41 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (58 lines)

Hi Joerg, I've been making a lot of cleanups out on SVN as I go  
through all the code as I write each chapter of the manual and  
discover things in the code which are less than optimal.  I then  
deprecate or slightly tweak it.  It's a good exercise but it'll drive  
you nuts, sorry about that.  :-)  Wait till people complain about the  
revised charting code API.

So you've got the right idea.  SimState's constructor is really  
*really* simple:

	public SimState(long seed)
		{
         	this.random = new MersenneTwisterFast(seed);
         	this.schedule = new Schedule();
         	this.seed = seed;  // for GUIs later on if they want to  
know...
		}

This means that all you have to do is call super(seed), then just set  
the schedule as you like, exactly like your example below.  I expect  
your code to be safe for the foreseeable future.

So I'm interested: what kind of code are you executing before and  
after each step?  Is there a reason why MASON's "ordering" facility  
wouldn't be sufficient?  Should we be thinking about adding a gizmo to  
the existing Schedule?

Sean

On Mar 22, 2011, at 2:32 AM, Joerg Hoehne wrote:

> Hi developers,
> in the current svn repository the SimState class was modified at  
> least the
> constructors. This class does now only provide one constructor  
> accepting a
> long a seed value for the random number generator.
> In older releases it was allowed to specify a scheduler what I did  
> in the past.
> I'm using a subclassed scheduler to execute some additional code  
> before and
> after each simulation step.
> Now I set the scheduler immediately after invoking super(seed) as  
> the code
> example shows below.
>
>
> 	private AbstractSimulation(IUserSimulation userSimulation) {
> 		super(1);
> 		this.schedule = new ScheduleExtended();
>                <and some more code>
>
> My question is: Is this a safe way to set up an own Schedule object  
> and will it
> be safe in the future?
>
>
> Jörg

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