FleetDB or other "NoSQL" store for Clojure?

[Marko Kocić]

Hi all,
I would like to try out some of those "no-sql" datastores for my next 
project, and need an advice which one, since I never used the one before.
It needs to fulfill at least some of those following criteria, in order of 
importance:

- is nicelly supported by Clojure (by this I mean idiomatic clojure 
"driver", not java plain java wrapper")
- it should be schemaless
- it should support transactions
- it's good if it can be used as embedded db
- it doesn't have to support large datasets (in-memmory is ok)
- it has to run on both Windows and Linux

My first choice would be FleetDB, since it was written in Clojure and 
examples look nice, but I'm not sure if it is abandonware or not, and I 
havent heard that people are actually using it in production.

What are my other options?

Regards,
Marko

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Re: FleetDB or other "NoSQL" store for Clojure?

[Sergey Didenko]

1) IMHO full SQL-like transaction support and NoSQL are quite contradicting
things. You can have some atomic operations with NoSQL but not that heavy
transactions as in traditional SQL world. (Correct me if I wrong). So one of
the option is to use SQL and serialize/ deserialize documents in your
application. Together with "embedded db" that gives you SQLite or similar.

2) If you are ok with atomic operations there are a lot of options. Here is
a discussion about embedded ones -
http://stackoverflow.com/questions/2403174/is-there-any-nosql-database-as-simple-as-sqlite

3) (Shamelessly advertising). If you just want it for prototyping you can
try my very small library -
https://github.com/SergeyDidenko/Simple-Persistence-for-Clojure . It
supports Clojure "dosync" transactions and saves them in a readable and
runnable way in text files. It trades reliability for speed so can lose a
few last updates on a power loss though. The migration to other DB is
extremely easy because of journalling nature.

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Re: Anyone on Google+ yet?

[Angel Java Lopez]

https://profiles.google.com/ajlopez2000
Thanks!

On Thu, Jul 14, 2011 at 2:12 PM, Claudia Doppioslash <
claudia.doppiosl...@gmail.com> wrote:

> My Clojure circle is all set up but empty.
> My g+ is: http://gplus.to/gattoclaudia
>
> Please add link to your profile below.
>
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Re: Anyone on Google+ yet?

[Frank Gerhardt]

Http://gplus.to/frankgerhardt

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Re: Anyone on Google+ yet?

[glen lenker]

http://gplus.to/glenker

On Thu, Jul 14, 2011 at 7:42 PM, Allen Johnson  wrote:
>> Yep, you're supposed to add everyone by hand and yes, it is totally unwieldy.
>> That's the way it is right now.
>> Circles are private and every user is supposed to make their own.
>
> I'm definitely liking it so far. Although I do find myself avoiding
> public posts to avoid spamming everyone in the Clojure circle but
> maybe I'm thinking about it too much. Because of this experiment I'm
> following lots of interesting people that I otherwise might not have
> found.
>
> We all share a common interest in clojure -- this is a fun way to see
> what other interests we all share.
>
> Allen
>
>>
>> cla
>>
>> 2011/7/15 Dave Ray :
>>> http://profiles.google.com/daveray
>>>
>>> maybe this is a dumb question, but am I supposed to manually add
>>> everyone on this thread in G+? Seems a little unwieldy.
>>>
>>> dave
>>
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Re: Anyone on Google+ yet?

[Daniel Renfer]

On Thu, Jul 14, 2011 at 1:12 PM, Claudia Doppioslash
 wrote:
> My Clojure circle is all set up but empty.
> My g+ is: http://gplus.to/gattoclaudia
>
> Please add link to your profile below.
>
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http://gplus.to/duck1123

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Re: Anyone on Google+ yet?

[Florian Over]

http://gplus.to/FlorianOver

2011/7/15 Daniel Renfer 

> On Thu, Jul 14, 2011 at 1:12 PM, Claudia Doppioslash
>  wrote:
> > My Clojure circle is all set up but empty.
> > My g+ is: http://gplus.to/gattoclaudia
> >
> > Please add link to your profile below.
> >
> > --
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>
> http://gplus.to/duck1123
>
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Re: Anyone on Google+ yet?

[Ben Smith-Mannschott]

On Thu, Jul 14, 2011 at 19:12, Claudia Doppioslash
 wrote:
> My Clojure circle is all set up but empty.
> My g+ is: http://gplus.to/gattoclaudia
>
> Please add link to your profile below.

https://plus.google.com/117672714007923674182

// Ben

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Re: Anyone on Google+ yet?

[Jeremy Heiler]

Is Google+ invite based? How did all of you get a profile?

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Re: Anyone on Google+ yet?

[Claudia Doppioslash]

Yes, it's invite-based. Invite sent to your gmail :)

2011/7/15 Jeremy Heiler :
> Is Google+ invite based? How did all of you get a profile?
>
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Re: Anyone on Google+ yet?

[Sergey Didenko]

Jeremy, I can send you an invitation. Do you need it?

On Fri, Jul 15, 2011 at 4:53 PM, Jeremy Heiler wrote:

> Is Google+ invite based? How did all of you get a profile?
>
>

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Re: Anyone on Google+ yet?

[Jeremy Heiler]

On Fri, Jul 15, 2011 at 10:07 AM, Claudia Doppioslash
 wrote:
> Yes, it's invite-based. Invite sent to your gmail :)
>

Thank you so much!

On Fri, Jul 15, 2011 at 10:09 AM, Sergey Didenko
 wrote:
> Jeremy, I can send you an invitation. Do you need it?
>

Claudia beat you to it ;-) But thank you!

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Re: can't set up Clojure 1.2.1

[Sergey Didenko]

Larry, it seems that the current folder "." is not in your default
classpath. Either try "...-cp ./clojure.jar ..." or add "." into your
default CLASSPATH.

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Re: Anyone on Google+ yet?

[Sergey Didenko]

Well, if you are going to spam, I guess Claudia will be penalized :)

Claudia beat you to it ;-) But thank you!
>
>

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Re: FleetDB or other "NoSQL" store for Clojure?

[Elías Alonso]

As far as I know, the only NoSQL DB supporting transactions right now
is Redis. It also satisfies the rest of your points (well, I'm not
sure if Redis run on windows...).

There are some wrappers for Cojure around, for example this one:

https://github.com/ragnard/redis-clojure

Regards,
Elías.

On 15 jul, 09:17, Marko Kocić  wrote:
> Hi all,
> I would like to try out some of those "no-sql" datastores for my next
> project, and need an advice which one, since I never used the one before.
> It needs to fulfill at least some of those following criteria, in order of
> importance:
>
> - is nicelly supported by Clojure (by this I mean idiomatic clojure
> "driver", not java plain java wrapper")
> - it should be schemaless
> - it should support transactions
> - it's good if it can be used as embedded db
> - it doesn't have to support large datasets (in-memmory is ok)
> - it has to run on both Windows and Linux
>
> My first choice would be FleetDB, since it was written in Clojure and
> examples look nice, but I'm not sure if it is abandonware or not, and I
> havent heard that people are actually using it in production.
>
> What are my other options?
>
> Regards,
> Marko

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Re: Anyone on Google+ yet?

[Elías Alonso]

https://plus.google.com/112030069981371003904

On 15 jul, 01:56, Kyle Root  wrote:
> gplus.to/Kylert
>
>
>
>
>
>
>
> On Thu, Jul 14, 2011 at 7:00 PM, ianp  wrote:
> > Ian
>
> > Looks like G+ is pretty popular with the Clojure crowd :-)
>
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Re: Anyone on Google+ yet?

[Christopher Redinger]

I am also on Google+

https://plus.google.com/u/1/103589339577092342191

Please freel free to add me to you Clojure circles.

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Re: Anyone on Google+ yet?

[Jeremy Heiler]

On Fri, Jul 15, 2011 at 10:17 AM, Sergey Didenko
 wrote:
> Well, if you are going to spam, I guess Claudia will be penalized :)
>

Right now I can only spam all of you. And, well, I can safely do that
right here ;-)

Link: https://plus.google.com/100568537112681351664

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Re: FleetDB or other "NoSQL" store for Clojure?

[Timothy Washington]

I've actually tried FleetDB, and describe
here,
what I found. I didn't go with it, and chose MongoDB instead. At the time,
Congomongo didn't support DB references. Bit it has since added  DB
reference
support.
I have yet to try them out, but they look promising.

HTH
Tim


On Fri, Jul 15, 2011 at 3:17 AM, Marko Kocić  wrote:

> Hi all,
> I would like to try out some of those "no-sql" datastores for my next
> project, and need an advice which one, since I never used the one before.
> It needs to fulfill at least some of those following criteria, in order of
> importance:
>
> - is nicelly supported by Clojure (by this I mean idiomatic clojure
> "driver", not java plain java wrapper")
> - it should be schemaless
> - it should support transactions
> - it's good if it can be used as embedded db
> - it doesn't have to support large datasets (in-memmory is ok)
> - it has to run on both Windows and Linux
>
> My first choice would be FleetDB, since it was written in Clojure and
> examples look nice, but I'm not sure if it is abandonware or not, and I
> havent heard that people are actually using it in production.
>
> What are my other options?
>
> Regards,
> Marko
>
> --
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Enlive (HTML templating library) tutorial

[Brian Marick]

Enlive is Christophe Grand's templating library for Clojure. Instead of the 
usual substitute-into-delimited-text approach, it works by editing node trees 
selected by CSS selectors. I’ve written a tutorial for it. Comments welcome, 
especially from Enlive novices.

https://github.com/cgrand/enlive/wiki/Table-and-Layout-Tutorial,-Part-1:-The-Goal

-
Brian Marick, Artisanal Labrador
Contract programming in Ruby and Clojure
Occasional consulting on Agile
www.exampler.com, www.twitter.com/marick

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Aparapi

[cej38]

Hello.
  Has anyone looked at using AMD's Aparapi API from within Clojure?

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Re: Anyone on Google+ yet?

[Toni Batchelli]

sorry, should be http://profiles.google.com/tbatchelli

On Fri, Jul 15, 2011 at 11:26 AM, Toni Batchelli  wrote:
> https://plus.google.com/tbatchelli
>
> I can't create one for disclojure yet. Support for Organizations
> "coming soon", or so it seems.
>
> Toni.
>
> On Fri, Jul 15, 2011 at 7:40 AM, Jeremy Heiler  wrote:
>> On Fri, Jul 15, 2011 at 10:17 AM, Sergey Didenko
>>  wrote:
>>> Well, if you are going to spam, I guess Claudia will be penalized :)
>>>
>>
>> Right now I can only spam all of you. And, well, I can safely do that
>> right here ;-)
>>
>> Link: https://plus.google.com/100568537112681351664
>>
>> --
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>
>
>
> --
> Antoni Batchelli
> - twitter: @tbatchelli , @disclojure
> --- email: tbatche...@gmail.com
> - web: tbatchelli.org , disclojure.org
>



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Re: Anyone on Google+ yet?

[Toni Batchelli]

https://plus.google.com/tbatchelli

I can't create one for disclojure yet. Support for Organizations
"coming soon", or so it seems.

Toni.

On Fri, Jul 15, 2011 at 7:40 AM, Jeremy Heiler  wrote:
> On Fri, Jul 15, 2011 at 10:17 AM, Sergey Didenko
>  wrote:
>> Well, if you are going to spam, I guess Claudia will be penalized :)
>>
>
> Right now I can only spam all of you. And, well, I can safely do that
> right here ;-)
>
> Link: https://plus.google.com/100568537112681351664
>
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Re: Aparapi

[Timothy Washington]

Haven't looked at it. But it looks interesting
(1,
2
).

*"... the inherent goal of Java's 'write once, run anywhere' programming
model is [effectively] extended beyond crossing over multiple operating
systems - to crossing multiple processing units."*


Tim Washington
twash...@gmail.com
416.843.9060



On Fri, Jul 15, 2011 at 1:17 PM, cej38  wrote:

> Hello.
>  Has anyone looked at using AMD's Aparapi API from within Clojure?
>
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Re: Anyone on Google+ yet?

[Claudia Doppioslash]

Here is the list :
https://plus.google.com/102547044539623029950/posts/e1jafgeu1q5

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[no subject]

[Joel Dice]

Hi all,

I thought I'd share the results of a fun little excercise I did this 
morning: running Clojure on a VM with native support for tail call 
optimization and first class continuations.  Any Schemers on this list 
will probably appreciate it.


The VM in question is Avian (http://oss.readytalk.com/avian/), built with 
optional tail call and continuation features enabled and using the OpenJDK 
class library.  It's not nearly as fast or sophisticated as e.g. Hotspot, 
but it has some features that make it interesting for running non-Java 
languages. I'm using the latest commit from the Git repository.


For example, here's what happens if you recurse too deeply using Hotspot:

 $ java -cp clojure.jar clojure.main
Clojure 1.2.1
user=> ((fn this [n] (if (= n 100) n (this (+ n 1 0)
java.lang.StackOverflowError (NO_SOURCE_FILE:0)
user=>

With Avian, there is no overflow, and we also get to play with 
continuations:


 $ ../avian/build/linux-x86_64-tails-continuations-openjdk-src/avian -Xmx512m 
-cp clojure.jar clojure.main
Clojure 1.2.1
user=> ((fn this [n] (if (= n 100) n (this (+ n 1 0)
100
user=> (defn call-cc [function]
   (avian.Continuations/callWithCurrentContinuation
 (reify avian.CallbackReceiver
   (receive [_ continuation]
(function (fn [result] (.handleResult continuation result)))
#'user/call-cc
user=> (call-cc (fn [continuation] (continuation "hello, world!")))
"hello, world!"
user=>

For more information about how continuations work in Avian, please see 
http://oss.readytalk.com/avian/javadoc/avian/Continuations.html.


Anyway, I think this is an interesting experiment since it shows that 
if/when tail call and continuation support are integrated into the JVM 
officially (http://openjdk.java.net/projects/mlvm/), Clojure could benefit 
with few or no modifications.


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Re:

[George Jahad]

very cool Joel!   I'd also be interested in start up time of avian vs.
hotspot, i.e. does avian make it viable to use clojure for short,
quick scripts?


On Jul 15, 11:59 am, Joel Dice  wrote:
> Hi all,
>
> I thought I'd share the results of a fun little excercise I did this
> morning: running Clojure on a VM with native support for tail call
> optimization and first class continuations.  Any Schemers on this list
> will probably appreciate it.
>
> The VM in question is Avian (http://oss.readytalk.com/avian/), built with
> optional tail call and continuation features enabled and using the OpenJDK
> class library.  It's not nearly as fast or sophisticated as e.g. Hotspot,
> but it has some features that make it interesting for running non-Java
> languages. I'm using the latest commit from the Git repository.
>
> For example, here's what happens if you recurse too deeply using Hotspot:
>
>   $ java -cp clojure.jar clojure.main
> Clojure 1.2.1
> user=> ((fn this [n] (if (= n 100) n (this (+ n 1 0)
> java.lang.StackOverflowError (NO_SOURCE_FILE:0)
> user=>
>
> With Avian, there is no overflow, and we also get to play with
> continuations:
>
>   $ ../avian/build/linux-x86_64-tails-continuations-openjdk-src/avian 
> -Xmx512m -cp clojure.jar clojure.main
> Clojure 1.2.1
> user=> ((fn this [n] (if (= n 100) n (this (+ n 1 0)
> 100
> user=> (defn call-cc [function]
>     (avian.Continuations/callWithCurrentContinuation
>       (reify avian.CallbackReceiver
>         (receive [_ continuation]
>          (function (fn [result] (.handleResult continuation result)))
> #'user/call-cc
> user=> (call-cc (fn [continuation] (continuation "hello, world!")))
> "hello, world!"
> user=>
>
> For more information about how continuations work in Avian, please 
> seehttp://oss.readytalk.com/avian/javadoc/avian/Continuations.html.
>
> Anyway, I think this is an interesting experiment since it shows that
> if/when tail call and continuation support are integrated into the JVM
> officially (http://openjdk.java.net/projects/mlvm/), Clojure could benefit
> with few or no modifications.

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Re: Tail Calls and Continuations in Clojure

[Joel Dice]

(sorry about the lack of subject in my original post; I've added one to 
this email)


On Fri, 15 Jul 2011, George Jahad wrote:


very cool Joel!   I'd also be interested in start up time of avian vs.
hotspot, i.e. does avian make it viable to use clojure for short,
quick scripts?


Possibly.  By default, Avian is noticeably slower to start up than 
Hotspot, at least when using OpenJDK's class library.  The boot process 
for that library touches a lot of code in a lot of classes, and Hotspot 
has several performance advantages to make quick work of it.  On the other 
hand, Avian can also be built to use its own class library, which allows 
much faster startup.  Unfortunately, it doesn't currently have all the 
classes needed to support Clojure, and I haven't checked to see how much 
would need to be added to make it work.


Avian also supports ahead-of-time compilation from Java bytecode to native 
machine code, so it would be possible to create an executable with all the 
OpenJDK and Clojure classes precompiled, thereby bypassing the need for 
JIT compilation at runtime except for dynamically-loaded classes.  That 
would be faster, but I'm not sure by how much.


The ideal approach in terms of startup time would be to add whatever 
classes needed to Avian's class library to support Clojure, use ProGuard 
to shrink and optimize the combination of clojure.jar and the system class 
library, and precompile the result into native code.  I might take a stab 
at that if I have time.




On Jul 15, 11:59 am, Joel Dice  wrote:

Hi all,

I thought I'd share the results of a fun little excercise I did this
morning: running Clojure on a VM with native support for tail call
optimization and first class continuations.  Any Schemers on this list
will probably appreciate it.

The VM in question is Avian (http://oss.readytalk.com/avian/), built with
optional tail call and continuation features enabled and using the OpenJDK
class library.  It's not nearly as fast or sophisticated as e.g. Hotspot,
but it has some features that make it interesting for running non-Java
languages. I'm using the latest commit from the Git repository.

For example, here's what happens if you recurse too deeply using Hotspot:

  $ java -cp clojure.jar clojure.main
Clojure 1.2.1
user=> ((fn this [n] (if (= n 100) n (this (+ n 1 0)
java.lang.StackOverflowError (NO_SOURCE_FILE:0)
user=>

With Avian, there is no overflow, and we also get to play with
continuations:

  $ ../avian/build/linux-x86_64-tails-continuations-openjdk-src/avian -Xmx512m 
-cp clojure.jar clojure.main
Clojure 1.2.1
user=> ((fn this [n] (if (= n 100) n (this (+ n 1 0)
100
user=> (defn call-cc [function]
    (avian.Continuations/callWithCurrentContinuation
      (reify avian.CallbackReceiver
        (receive [_ continuation]
         (function (fn [result] (.handleResult continuation result)))
#'user/call-cc
user=> (call-cc (fn [continuation] (continuation "hello, world!")))
"hello, world!"
user=>

For more information about how continuations work in Avian, please 
seehttp://oss.readytalk.com/avian/javadoc/avian/Continuations.html.

Anyway, I think this is an interesting experiment since it shows that
if/when tail call and continuation support are integrated into the JVM
officially (http://openjdk.java.net/projects/mlvm/), Clojure could benefit
with few or no modifications.


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Re: Namespace Docstrings?

[Rasmus Svensson]

2011/7/14 OGINO Masanori :
> Hello.
>
> What is the right way to display namespace docstrings?
>
> One day, as usual, I typed:
>
> (doc 'clojure.core) ; or other namespace
>
> Then the REPL said "clojure.lang.Cons cannot be cast to clojure.lang.Symbol."
> I thought "Ah, I know, the message means "(quote clojure.core) cannot
> be cast to the symbol clojure.core." I'm wrong." and typed:
>
> (doc clojure.core)
>
> Then the REPL said "ClassNotFoundException clojure.core."
> I thought "Indeed, clojure.core seems to be an class name...
> Precisely, can (doc) display namespace docstrings?" and typed:
>
> (source doc)
>
> Oh, (doc) uses (find-ns), so (doc) should display namespace docstrings. But 
> how?
> Finally I wrote (:doc (meta (the-ns 'clojure.core))) but I know this
> is a wrong way.
> When I forget this ad-hoc solution, I'll repeat above.
>
> I determined to ask it because I have repeated again just now and I'm annoyed.
> Any thought?
>
> Thanks.

'doc' is only used for things that are vars (functions, and other
globals). Namespaces are not vars, so you cannot use 'doc' with them.
To see the docs for a namespace, use the 'print-namespace-doc'
function:

(print-namespace-doc 'the.name.space)

// raek

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Re: Namespace Docstrings?

[Alan Malloy]

On Jul 15, 3:10 pm, Rasmus Svensson  wrote:
> 2011/7/14 OGINO Masanori :
> > Hello.
>
> > What is the right way to display namespace docstrings?
>
> > One day, as usual, I typed:
>
> > (doc 'clojure.core) ; or other namespace
>
> > Then the REPL said "clojure.lang.Cons cannot be cast to 
> > clojure.lang.Symbol."
> > I thought "Ah, I know, the message means "(quote clojure.core) cannot
> > be cast to the symbol clojure.core." I'm wrong." and typed:
>
> > (doc clojure.core)
>
> > Then the REPL said "ClassNotFoundException clojure.core."
> > I thought "Indeed, clojure.core seems to be an class name...
> > Precisely, can (doc) display namespace docstrings?" and typed:
>
> > (source doc)
>
> > Oh, (doc) uses (find-ns), so (doc) should display namespace docstrings. But 
> > how?
> > Finally I wrote (:doc (meta (the-ns 'clojure.core))) but I know this
> > is a wrong way.
> > When I forget this ad-hoc solution, I'll repeat above.
>
> > I determined to ask it because I have repeated again just now and I'm 
> > annoyed.
> > Any thought?
>
> > Thanks.
>
> 'doc' is only used for things that are vars (functions, and other
> globals). Namespaces are not vars, so you cannot use 'doc' with them.
> To see the docs for a namespace, use the 'print-namespace-doc'
> function:
>
>     (print-namespace-doc 'the.name.space)
>

This is not true in 1.2.x: (doc clojure.core) works fine for me. If it
stopped working in 1.3 intentionally, that's fine (I guess?), but it
sounds like it was an accident.

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Re: Namespace Docstrings?

[OGINO Masanori]

Hello.

Thank you for giving your opinion, Rasmus.

Indeed, (doc doc) says, "I am for a var or special form."

However, according to (source doc), there is some code for namespace,
and this code won't be used since (ns-resolve) breaks its promise.
Moreover, with 1.2.1, (doc) uses (print-namespace-doc) internally!

And... I hesitate to say but... (print-namespace-doc) seems to be
removed in 1.3.
So I think we also should update docstring of (doc), right?

Thanks.

-- 
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E-mail: masanori.og...@gmail.com

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Re: Tail Calls and Continuations in Clojure

[Brent Millare]

That's really cool. I'm glad someone got it to work and with little
modification!

On Jul 15, 4:21 pm, Joel Dice  wrote:
> (sorry about the lack of subject in my original post; I've added one to
> this email)
>
> On Fri, 15 Jul 2011, George Jahad wrote:
> > very cool Joel!   I'd also be interested in start up time of avian vs.
> > hotspot, i.e. does avian make it viable to use clojure for short,
> > quick scripts?
>
> Possibly.  By default, Avian is noticeably slower to start up than
> Hotspot, at least when using OpenJDK's class library.  The boot process
> for that library touches a lot of code in a lot of classes, and Hotspot
> has several performance advantages to make quick work of it.  On the other
> hand, Avian can also be built to use its own class library, which allows
> much faster startup.  Unfortunately, it doesn't currently have all the
> classes needed to support Clojure, and I haven't checked to see how much
> would need to be added to make it work.
>
> Avian also supports ahead-of-time compilation from Java bytecode to native
> machine code, so it would be possible to create an executable with all the
> OpenJDK and Clojure classes precompiled, thereby bypassing the need for
> JIT compilation at runtime except for dynamically-loaded classes.  That
> would be faster, but I'm not sure by how much.
>
> The ideal approach in terms of startup time would be to add whatever
> classes needed to Avian's class library to support Clojure, use ProGuard
> to shrink and optimize the combination of clojure.jar and the system class
> library, and precompile the result into native code.  I might take a stab
> at that if I have time.
>
>
>
>
>
>
>
>
>
> > On Jul 15, 11:59�am, Joel Dice  wrote:
> >> Hi all,
>
> >> I thought I'd share the results of a fun little excercise I did this
> >> morning: running Clojure on a VM with native support for tail call
> >> optimization and first class continuations. �Any Schemers on this list
> >> will probably appreciate it.
>
> >> The VM in question is Avian (http://oss.readytalk.com/avian/), built with
> >> optional tail call and continuation features enabled and using the OpenJDK
> >> class library. �It's not nearly as fast or sophisticated as e.g. Hotspot,
> >> but it has some features that make it interesting for running non-Java
> >> languages. I'm using the latest commit from the Git repository.
>
> >> For example, here's what happens if you recurse too deeply using Hotspot:
>
> >> � $ java -cp clojure.jar clojure.main
> >> Clojure 1.2.1
> >> user=> ((fn this [n] (if (= n 100) n (this (+ n 1 0)
> >> java.lang.StackOverflowError (NO_SOURCE_FILE:0)
> >> user=>
>
> >> With Avian, there is no overflow, and we also get to play with
> >> continuations:
>
> >> � $ ../avian/build/linux-x86_64-tails-continuations-openjdk-src/avian 
> >> -Xmx512m -cp clojure.jar clojure.main
> >> Clojure 1.2.1
> >> user=> ((fn this [n] (if (= n 100) n (this (+ n 1 0)
> >> 100
> >> user=> (defn call-cc [function]
> >> � � (avian.Continuations/callWithCurrentContinuation
> >> � � � (reify avian.CallbackReceiver
> >> � � � � (receive [_ continuation]
> >> � � � � �(function (fn [result] (.handleResult continuation 
> >> result)))
> >> #'user/call-cc
> >> user=> (call-cc (fn [continuation] (continuation "hello, world!")))
> >> "hello, world!"
> >> user=>
>
> >> For more information about how continuations work in Avian, please 
> >> seehttp://oss.readytalk.com/avian/javadoc/avian/Continuations.html.
>
> >> Anyway, I think this is an interesting experiment since it shows that
> >> if/when tail call and continuation support are integrated into the JVM
> >> officially (http://openjdk.java.net/projects/mlvm/), Clojure could benefit
> >> with few or no modifications.
>
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Re: can't set up Clojure 1.2.1

[Larry Travis]

Thanks, Sergey.  The problem was indeed a classpath problem. The part of 
my ignorance about Java that seems to cause me the most trouble is my 
ignorance about Java classpaths. I think some Clojurians underestimate 
the difficulties involved in learning Clojure without knowing Java 
first.  I wish that the Clojure books available, most of which are quite 
excellent otherwise, did not assume a previous knowledge of Java on the 
reader's part but included an early section covering what it is 
essential to know about Java and the JVM before one can fully understand 
Clojure and become proficient in it.


Of course, the best response to such a criticism is "Don't just 
criticize. Write such a book." It will be a while before I know enough 
to do so!

  --Larry

On 7/15/11 9:16 AM, Sergey Didenko wrote:
Larry, it seems that the current folder "." is not in your default 
classpath. Either try "...-cp ./clojure.jar ..." or add "." into your 
default CLASSPATH.



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