Re: Controlling how maps/records/atoms etc. are printed out

[Colin Yates]

Thanks Timothy

On Saturday, 12 November 2016, Timothy Baldridge 
wrote:

> clojure.core/print-method is a multi method that handles the printing of
> objects. You can override or implement the print method by:
>
> (defmethod print-method my.class.Foo
>   [^my.class.Foo instance ^Writer w]
>   (.write w ...))
>
> I do that to provide custom printing for deftypes, but you can easily
> override how records are printed as well.
>
> Timothy
>
> On Sat, Nov 12, 2016 at 2:35 AM, Colin Yates  > wrote:
>
>> Hi all,
>>
>> I cache quite a bit of stuff on the server, so when I return or print
>> out the 'system' I get the unhelpful recursive stack trace of Java
>> running out of heap.
>>
>> Is there some protocol I can implement on large data structures such
>> that whenever they are serialised they just dump some of their
>> contents?
>>
>> These objects will only ever be printed out either at the REPL,
>> (println) or clojure.tools.logging/log etc. I never expect them to be
>> serialised and then later deserialised from the serialised form.
>>
>> Any suggestions?
>>
>> Thanks all,
>>
>> Colin
>>
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>
>
>
> --
> “One of the main causes of the fall of the Roman Empire was that–lacking
> zero–they had no way to indicate successful termination of their C
> programs.”
> (Robert Firth)
>
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Re: Controlling how maps/records/atoms etc. are printed out

[Timothy Baldridge]

clojure.core/print-method is a multi method that handles the printing of
objects. You can override or implement the print method by:

(defmethod print-method my.class.Foo
  [^my.class.Foo instance ^Writer w]
  (.write w ...))

I do that to provide custom printing for deftypes, but you can easily
override how records are printed as well.

Timothy

On Sat, Nov 12, 2016 at 2:35 AM, Colin Yates  wrote:

> Hi all,
>
> I cache quite a bit of stuff on the server, so when I return or print
> out the 'system' I get the unhelpful recursive stack trace of Java
> running out of heap.
>
> Is there some protocol I can implement on large data structures such
> that whenever they are serialised they just dump some of their
> contents?
>
> These objects will only ever be printed out either at the REPL,
> (println) or clojure.tools.logging/log etc. I never expect them to be
> serialised and then later deserialised from the serialised form.
>
> Any suggestions?
>
> Thanks all,
>
> Colin
>
> --
> You received this message because you are subscribed to the Google
> Groups "Clojure" group.
> To post to this group, send email to clojure@googlegroups.com
> Note that posts from new members are moderated - please be patient with
> your first post.
> To unsubscribe from this group, send email to
> clojure+unsubscr...@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/clojure?hl=en
> ---
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>



-- 
“One of the main causes of the fall of the Roman Empire was that–lacking
zero–they had no way to indicate successful termination of their C
programs.”
(Robert Firth)

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Controlling how maps/records/atoms etc. are printed out

[Colin Yates]

Hi all,

I cache quite a bit of stuff on the server, so when I return or print
out the 'system' I get the unhelpful recursive stack trace of Java
running out of heap.

Is there some protocol I can implement on large data structures such
that whenever they are serialised they just dump some of their
contents?

These objects will only ever be printed out either at the REPL,
(println) or clojure.tools.logging/log etc. I never expect them to be
serialised and then later deserialised from the serialised form.

Any suggestions?

Thanks all,

Colin

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