Hi,
On May 31, 1:46 pm, "Sina K. Heshmati" <[email protected]> wrote:
> Here's my concern:
>
> - My program (A) is running.
> - B is running on the same VM.
> - B accesses the state of A.
> - B alters the state of A in an inconsistent way
> e.g. whenever the internal state x changes, the
> internal state y also has to change accordingly,
> but B only changes x.
> - A is screwed.
A is namespace my.ns.a. There you define a private var: (def
^{:private true} state (atom 0)). B is namespace my.ns.b. B cannot
change state in A.
user=> (ns my.ns.a)
nil
my.ns.a=> (def ^{:private true} state (atom 0))
#'my.ns.a/state
my.ns.a=> (ns my.ns.b)
nil
my.ns.b=> (reset! my.ns.a/state :messed-up-your-state-harharhar)
java.lang.IllegalStateException: var: my.ns.a/state is not public
(NO_SOURCE_FILE:4)
>From a philosophical point of view:
Either you develop an application and
you are in charge of B. => You are in control: don't do it.
you are not in charge of B. => B is obviously a crappy library which
you should not use in project.
You develop a library: A. Why bother? Since your library is well
documented it clearly defines the contract. Why care for people who
are too lazy to read?
> Is there a way to pass the function itself rather
> than making a new function that calls the exact
> same function with the same arguments?
(let [state (atom 0)]
(extend t-a
prot-a
{:op-a (fn [this x y] (+ (.member this) x y @state))}))
Sincerely
Meikel
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