Have you considered modelling this as a functional problem first?
So perhaps start out with an immutable data structure to model your cells:
(def cells
{:x [:const 1]
:y [:const 2]
:z [:derive [:x :y] (fn [x y] (+ x y))]}
Then you could use a function to calculate the value:
(calculate cells)
=> {:x 1, :y 2, :z 3}
If you want cells to act more like refs, then you can keep a global
database:
(def cells-data (atom {})
Then use an watch on the atom to keep a cache of the calculation whenever
the cells change.
When you create a cell, it adds to the global database. When you deref a
cell, it just refers to the cached calculation.
If you need more performance than an atom, you could use something like the
megaref <https://github.com/cgrand/megaref> library.
- James
On 26 March 2016 at 12:07, hiskennyness <[email protected]> wrote:
> Follow-up question: how do I test that I am collision-proof?
>
> Perhaps:
>
> 1. Kick off two threads (call them 1st and 2nd) 100ms apart
> 2. Have them update the same ref
> 3. Have 1st do the initial reset! to the ref then sleep for 200ms
> 4. 2nd just charges ahead
> 5. Check that each took full and complete effect, with 2nd appearing
> before 1st (do I have that right? Collisions are detected when a dosync
> finishes and attempts to write to the refs?)
>
> How'm I doin?
>
> Thx, hk
>
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