[self-interest] Saving objects with Hackney [1 Attachment]

[Josh Flowers]

This sounds great Russell.  The transporter was a point of 
unsureness when I worked on the IRC client, so I'll be looking at 
your code with interest.

Your e-mail brings up a question I've been pondering (when I have 
time to ponder Self) - could we load multiple snapshots into a single 
running VM?  Last time I played with Squeak it had the concept of 
Projects (least that's what I think they were called) which were 
almost like separate worlds within a single VM.  Is it technically 
possible to do something similar in Self?  Is there anything about the 
VM that precludes having multiple, separate lobbies?  Or traits?  
true's and false's?

> All the talk about object saving etc inspired me to throw together a rough sketch of a framework for object saving as a exercise in building stuff in Self. The code builds upon the transporter's facilities but ignores modules.
> 
> All it does is take a object root, map out the bounds of the object cluster using a fitness test, then write out the set of objects on the file in a pleasing indented manner. It more or less handles internal loops; but a nice mechanism for that depends on moving the parser from the VM into Self. It has a hardcoded limit of 1000 objects to iterate over, just to make development easier by preventing accidentally iterating over the entire image.
> 
> The current fitness test is simply whether (a) the sub-object has a creatorPath and (b) whether it is a worldMorph. Playing with this is a good illustration of Dave's point that the tricky question is where to stop!
> 
> This is a rough outline of a framework for testing stuff (in particular there aren't any tests and the code is ugly :) - it probably isn't particularly useful.
> 
> Things I missed while writing this: a streams library, a unit testing framework, a modifiable Self parser 
> 
> If you take a clean snapshot and put the attached hackney.self file in the same directory, you can load it by:
> 
> bootstrap read: 'hackney' From: ''
> 
> and then save objects as:
> 
> transporter hackney save: myObject As: fileName
> 
> and load by getting the results of:
> 
> transporter hackney read: fileName
> 
> Have fun, Russell
> 
> 
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