Serializable Collections ?

[Jules]

Guys,

I've searched the group and cannot find an answer to this one...

Why are many of the more common collection types in Clojure not
Serializable :

Clojure 1.1.0-new-SNAPSHOT
user=> (def #^java.io.ObjectOutput os (java.io.ObjectOutputStream.
(java.io.FileOutputStream. "/dev/null")))
#'user/os
user=> (.writeObject os [1 2 3 4])
java.io.NotSerializableException: clojure.lang.PersistentVector$Node
(NO_SOURCE_FILE:0)
user=> (.writeObject os (list 1 2 3 4))
java.io.NotSerializableException: clojure.lang.PersistentList
(NO_SOURCE_FILE:0)
user=> (.writeObject os #{1 2 3 4})
java.io.NotSerializableException: clojure.lang.PersistentHashMap
$BitmapIndexedNode (NO_SOURCE_FILE:0)
user=> (.writeObject os {:1 2 :3 4})
nil
user=>

I am writing a distributed Java/Clojure app and am constantly bitten
by this. I am always having to copy collections into ArrayLists before
sending them, from Java code, over the wire...

ArrayLists, however do not implement Comparable and I now need a
Comparable AND Serializable collection. :-(

Is there a wishlist for Clojure 1.2 ? :-)

Is there a good reason why making '(), [], {} and #{} Serializable
should not be on it ?

thanks


Jules

P.S.

I'm using 1.1.0-new-SNAPSHOT - is there another version that
implements this, hence the lack of noise on the list ?

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[Brian Hurt]

On Tue, Apr 27, 2010 at 9:10 AM, Jules <jules....@gmail.com> wrote:

Guys,

I've searched the group and cannot find an answer to this one...

Why are many of the more common collection types in Clojure not
Serializable :

I have an assemblia ticket open on this issue:
https://www.assembla.com/spaces/clojure/tickets/281-make-more-datastructures-serializable

I need to finish a new version of the patch that more carefully controls what is serialized.

Brian

[Jules]

Brian,

Thanks for getting back to me :-)

I look forward to your changes making it into the mainline.

I'm going to register with Assembla and watch this ticket. If I find a
way to vote for it, I will do.

Jules


On Apr 27, 3:59 pm, Brian Hurt <bhur...@gmail.com> wrote:

> On Tue, Apr 27, 2010 at 9:10 AM, Jules <jules.gosn...@gmail.com> wrote:
> > Guys,
>
> > I've searched the group and cannot find an answer to this one...
>
> > Why are many of the more common collection types in Clojure not
> > Serializable :
>

> I have an assemblia ticket open on this issue:https://www.assembla.com/spaces/clojure/tickets/281-make-more-datastr...