From kamen at cybuild.com  Fri Sep 15 13:47:36 2006
From: kamen at cybuild.com (Kamen TOMOV)
Date: Fri, 15 Sep 2006 16:47:36 +0300
Subject: [bknr-devel] problem deleting datastore objects and multiple
	inheritance
Message-ID: <uejudnsw7.fsf@cybuild.com>

Hi, 

I have the following problem with bknr-datastore:

(define-persistent-class a ()
  ())                        

(define-persistent-class b ()
  ())                        

(define-persistent-class c (a)
  ())                     

(define-persistent-class d (a b)
  ())                     

(delete-object (make-object 'a)) 
=> T   

(delete-object (make-object 'c)) 
=> T   

(delete-object (make-object 'd)) 
=>

Type-error in KERNEL::OBJECT-NOT-SIMPLE-VECTOR-ERROR-HANDLER:
   NIL is not of type SIMPLE-VECTOR
   [Condition of type TYPE-ERROR]

Restarts:
  0: [RETRY-TRANSACTION] Retry the transaction #<TRANSACTION 15.09.2006 15:37:18 TX-DELETE-OBJECT 75>.
  1: [ABORT-REQUEST] Abort handling SLIME request.
  2: [ABORT] Return to Top-Level.

Backtrace:
  0: ((METHOD BKNR.SKIP-LIST:SKIP-LIST-DELETE NIL (BKNR.SKIP-LIST:SKIP-LIST T)) (#(2) . #(#)) #<unused-arg> #<BKNR.SKIP-LIST:SKIP-LIST length = 15 {5A483CDD}> 75)
  1: ((METHOD INDEX-REMOVE NIL (CLASS-SKIP-INDEX T)) (#(2 0 1) . #()) #<unused-arg> #<CLASS-SKIP-INDEX {5A42962D}> #<D ID: 75>)
  2: ((METHOD BKNR.INDICES::DESTROY-OBJECT-WITH-CLASS NIL (INDEXED-CLASS T)) (#(17) . #()) #<unused-arg> #<PERSISTENT-CLASS D {58E9228D}> #<D ID: 75>)
  3: ("DEFMETHOD EXECUTE-UNLOGGED (TRANSACTION)")
  4: ("DEFCLASS MP-STORE" #<Closure Over Function "DEFMETHOD EXECUTE-UNLOGGED (TRANSACTION)" {58EB87C1}>)
  5: ((METHOD BKNR.DATASTORE::EXECUTE-UNLOGGED (:AROUND) (TRANSACTION)) #<unused-arg> #S(PCL::FAST-METHOD-CALL :FUNCTION #<Closure Over Function "LAMBDA (#:G4209 #:G4210 #:G4211)" {5819E5D9}> :PV-CELL NIL :NEXT-METHOD-CALL NIL :ARG-INFO (1)) #<TRANSACTION 15.09.2006 15:37:18 TX-DELETE-OBJECT 75>)
  6: ("DEFMETHOD EXECUTE-TRANSACTION (STORE TRANSACTION)")
  7: ("DEFCLASS MP-STORE" #<Closure Over Function "DEFMETHOD EXECUTE-TRANSACTION (STORE TRANSACTION)" {58EB8749}>)
  8: ((METHOD BKNR.DATASTORE::EXECUTE-TRANSACTION NIL (STORE TRANSACTION)) (#(0) . #(#)) #<#1=unused-arg> #<#1#> #<TRANSACTION 15.09.2006 15:37:18 TX-DELETE-OBJECT 75>)


I'm using the latest bknr and CMUCL 19a-release-20040728 . Here is how
the store is defined:

(make-instance 'mp-store
		 :directory "/tmp/ams-object-store/"
		 :subsystems (list (make-instance 'store-object-subsystem))

Could please advice? Thanks!

-- 
Kamen TOMOV


From kamen at cybuild.com  Fri Sep 15 15:14:35 2006
From: kamen at cybuild.com (Kamen TOMOV)
Date: Fri, 15 Sep 2006 18:14:35 +0300
Subject: [bknr-devel] problem deleting datastore objects and multiple
	inheritance
In-Reply-To: <fd2982320609150728m2394767bq3585d6b1b98df03e@mail.gmail.com>
	(Hans Huebner's message of "Fri, 15 Sep 2006 16:28:16 +0200")
References: <uejudnsw7.fsf@cybuild.com>
	<fd2982320609150728m2394767bq3585d6b1b98df03e@mail.gmail.com>
Message-ID: <u1wqdnov8.fsf@cybuild.com>

Dear Hans, 

First thank you very much! Your support is amazing as it has always
been.

I would keep an eye on the problem and will let you know if any
problem appear. By the way I'm just starting this project and was
writing unit-tests when this appeared.

By the way could you please elaborate a bit about this maintenance
mode you've mentioned? I find bknr-datastore a superb technology
applicable in many projects and as I remember how passionate you were
about it, this sounds weird.

Kamen


On ?????, ????????? 15 2006, Hans Huebner wrote:

> Hi Kamen,
>
> I commited a workaround that fixes the problem.  It has only been
> quickly tested by me and I cannot promise much.
>
> Note that my BKNR based projects are currently in maintenance mode and
> I cannot promise to fix all bugs.  I will try my best, but for example
> this present case would require a deeper analysis to see what really
> goes wrong.  It would be great if you could try the fix and let me
> know if it works for you or if it creates new problems.
>
> The bad thing about this fix is that it may obscure other bugs, as a
> condition that should not normally occur is now handled as a normal
> case (i.e. a lower layer returns NIL and if so, the function just does
> nothing).
>
> Cheers,
> Hans
>
> On 9/15/06, Kamen TOMOV <kamen at cybuild.com> wrote:
>> Hi,
>>
>> I have the following problem with bknr-datastore:
>>
>> (define-persistent-class a ()
>>   ())
>>
>> (define-persistent-class b ()
>>   ())
>>
>> (define-persistent-class c (a)
>>   ())
>>
>> (define-persistent-class d (a b)
>>   ())
>>
>> (delete-object (make-object 'a))
>> => T
>>
>> (delete-object (make-object 'c))
>> => T
>>
>> (delete-object (make-object 'd))
>> =>
>>
>> Type-error in KERNEL::OBJECT-NOT-SIMPLE-VECTOR-ERROR-HANDLER:
>>    NIL is not of type SIMPLE-VECTOR
>>    [Condition of type TYPE-ERROR]
>>
>> Restarts:
>>   0: [RETRY-TRANSACTION] Retry the transaction #<TRANSACTION 15.09.2006 15:37:18 TX-DELETE-OBJECT 75>.
>>   1: [ABORT-REQUEST] Abort handling SLIME request.
>>   2: [ABORT] Return to Top-Level.
>>
>> Backtrace:
>>   0: ((METHOD BKNR.SKIP-LIST:SKIP-LIST-DELETE NIL (BKNR.SKIP-LIST:SKIP-LIST T)) (#(2) . #(#)) #<unused-arg> #<BKNR.SKIP-LIST:SKIP-LIST length = 15 {5A483CDD}> 75)
>>   1: ((METHOD INDEX-REMOVE NIL (CLASS-SKIP-INDEX T)) (#(2 0 1) . #()) #<unused-arg> #<CLASS-SKIP-INDEX {5A42962D}> #<D ID: 75>)
>>   2: ((METHOD BKNR.INDICES::DESTROY-OBJECT-WITH-CLASS NIL (INDEXED-CLASS T)) (#(17) . #()) #<unused-arg> #<PERSISTENT-CLASS D {58E9228D}> #<D ID: 75>)
>>   3: ("DEFMETHOD EXECUTE-UNLOGGED (TRANSACTION)")
>>   4: ("DEFCLASS MP-STORE" #<Closure Over Function "DEFMETHOD EXECUTE-UNLOGGED (TRANSACTION)" {58EB87C1}>)
>>   5: ((METHOD BKNR.DATASTORE::EXECUTE-UNLOGGED (:AROUND) (TRANSACTION)) #<unused-arg> #S(PCL::FAST-METHOD-CALL :FUNCTION #<Closure Over Function "LAMBDA (#:G4209 #:G4210 #:G4211)" {5819E5D9}> :PV-CELL NIL :NEXT-METHOD-CALL NIL :ARG-INFO (1)) #<TRANSACTION 15.09.2006 15:37:18 TX-DELETE-OBJECT 75>)
>>   6: ("DEFMETHOD EXECUTE-TRANSACTION (STORE TRANSACTION)")
>>   7: ("DEFCLASS MP-STORE" #<Closure Over Function "DEFMETHOD EXECUTE-TRANSACTION (STORE TRANSACTION)" {58EB8749}>)
>>   8: ((METHOD BKNR.DATASTORE::EXECUTE-TRANSACTION NIL (STORE TRANSACTION)) (#(0) . #(#)) #<#1=unused-arg> #<#1#> #<TRANSACTION 15.09.2006 15:37:18 TX-DELETE-OBJECT 75>)
>>
>>
>> I'm using the latest bknr and CMUCL 19a-release-20040728 . Here is how
>> the store is defined:
>>
>> (make-instance 'mp-store
>>                  :directory "/tmp/ams-object-store/"
>>                  :subsystems (list (make-instance 'store-object-subsystem))
>>
>> Could please advice? Thanks!
>>
>> --
>> Kamen TOMOV
>> _______________________________________________
>> bknr-devel mailing list
>> bknr-devel at common-lisp.net
>> http://common-lisp.net/cgi-bin/mailman/listinfo/bknr-devel


From hans.huebner at gmail.com  Fri Sep 15 15:24:45 2006
From: hans.huebner at gmail.com (Hans Huebner)
Date: Fri, 15 Sep 2006 17:24:45 +0200
Subject: [bknr-devel] problem deleting datastore objects and multiple
	inheritance
In-Reply-To: <u1wqdnov8.fsf@cybuild.com>
References: <uejudnsw7.fsf@cybuild.com>
	<fd2982320609150728m2394767bq3585d6b1b98df03e@mail.gmail.com>
	<u1wqdnov8.fsf@cybuild.com>
Message-ID: <fd2982320609150824r1b70a706h1f25c0a8530c9eb3@mail.gmail.com>

Hi Kamen,

On 9/15/06, Kamen TOMOV <kamen at cybuild.com> wrote:
> By the way could you please elaborate a bit about this maintenance
> mode you've mentioned? I find bknr-datastore a superb technology
> applicable in many projects and as I remember how passionate you were
> about it, this sounds weird.

I still believe that the datastore approach is right, and I don?t
expect to change my opinion.  "Maintenance mode" means that I do not
currently have new projects based on BKNR, so I am supporting my two
existing projects and that?s about it.  When Manuel and I started
developing BKNR, I planned to stay self-employed and do more
commercial products based on this technology.  As time has shown, I
did not have enough financial background to bridge the time between
projects (I have family to support), so I am now employed again and
working on C++/Javascript based embedded systems for a living.
Supporting my old customers and BKNR is something I do in my free
time.

Manuel, who wrote a lot of the better stuff in BKNR, has pretty much
left computing for personal reasons, so I am the only person to
support the system right now.  As I wrote:  I do my best to do this,
but in the end it is more or less a hobby which cannot really take
that much of my free time.

Cheers,
Hans


From hans.huebner at gmail.com  Fri Sep 15 14:28:16 2006
From: hans.huebner at gmail.com (Hans Huebner)
Date: Fri, 15 Sep 2006 16:28:16 +0200
Subject: [bknr-devel] problem deleting datastore objects and multiple
	inheritance
In-Reply-To: <uejudnsw7.fsf@cybuild.com>
References: <uejudnsw7.fsf@cybuild.com>
Message-ID: <fd2982320609150728m2394767bq3585d6b1b98df03e@mail.gmail.com>

Hi Kamen,

I commited a workaround that fixes the problem.  It has only been
quickly tested by me and I cannot promise much.

Note that my BKNR based projects are currently in maintenance mode and
I cannot promise to fix all bugs.  I will try my best, but for example
this present case would require a deeper analysis to see what really
goes wrong.  It would be great if you could try the fix and let me
know if it works for you or if it creates new problems.

The bad thing about this fix is that it may obscure other bugs, as a
condition that should not normally occur is now handled as a normal
case (i.e. a lower layer returns NIL and if so, the function just does
nothing).

Cheers,
Hans

On 9/15/06, Kamen TOMOV <kamen at cybuild.com> wrote:
> Hi,
>
> I have the following problem with bknr-datastore:
>
> (define-persistent-class a ()
>   ())
>
> (define-persistent-class b ()
>   ())
>
> (define-persistent-class c (a)
>   ())
>
> (define-persistent-class d (a b)
>   ())
>
> (delete-object (make-object 'a))
> => T
>
> (delete-object (make-object 'c))
> => T
>
> (delete-object (make-object 'd))
> =>
>
> Type-error in KERNEL::OBJECT-NOT-SIMPLE-VECTOR-ERROR-HANDLER:
>    NIL is not of type SIMPLE-VECTOR
>    [Condition of type TYPE-ERROR]
>
> Restarts:
>   0: [RETRY-TRANSACTION] Retry the transaction #<TRANSACTION 15.09.2006 15:37:18 TX-DELETE-OBJECT 75>.
>   1: [ABORT-REQUEST] Abort handling SLIME request.
>   2: [ABORT] Return to Top-Level.
>
> Backtrace:
>   0: ((METHOD BKNR.SKIP-LIST:SKIP-LIST-DELETE NIL (BKNR.SKIP-LIST:SKIP-LIST T)) (#(2) . #(#)) #<unused-arg> #<BKNR.SKIP-LIST:SKIP-LIST length = 15 {5A483CDD}> 75)
>   1: ((METHOD INDEX-REMOVE NIL (CLASS-SKIP-INDEX T)) (#(2 0 1) . #()) #<unused-arg> #<CLASS-SKIP-INDEX {5A42962D}> #<D ID: 75>)
>   2: ((METHOD BKNR.INDICES::DESTROY-OBJECT-WITH-CLASS NIL (INDEXED-CLASS T)) (#(17) . #()) #<unused-arg> #<PERSISTENT-CLASS D {58E9228D}> #<D ID: 75>)
>   3: ("DEFMETHOD EXECUTE-UNLOGGED (TRANSACTION)")
>   4: ("DEFCLASS MP-STORE" #<Closure Over Function "DEFMETHOD EXECUTE-UNLOGGED (TRANSACTION)" {58EB87C1}>)
>   5: ((METHOD BKNR.DATASTORE::EXECUTE-UNLOGGED (:AROUND) (TRANSACTION)) #<unused-arg> #S(PCL::FAST-METHOD-CALL :FUNCTION #<Closure Over Function "LAMBDA (#:G4209 #:G4210 #:G4211)" {5819E5D9}> :PV-CELL NIL :NEXT-METHOD-CALL NIL :ARG-INFO (1)) #<TRANSACTION 15.09.2006 15:37:18 TX-DELETE-OBJECT 75>)
>   6: ("DEFMETHOD EXECUTE-TRANSACTION (STORE TRANSACTION)")
>   7: ("DEFCLASS MP-STORE" #<Closure Over Function "DEFMETHOD EXECUTE-TRANSACTION (STORE TRANSACTION)" {58EB8749}>)
>   8: ((METHOD BKNR.DATASTORE::EXECUTE-TRANSACTION NIL (STORE TRANSACTION)) (#(0) . #(#)) #<#1=unused-arg> #<#1#> #<TRANSACTION 15.09.2006 15:37:18 TX-DELETE-OBJECT 75>)
>
>
> I'm using the latest bknr and CMUCL 19a-release-20040728 . Here is how
> the store is defined:
>
> (make-instance 'mp-store
>                  :directory "/tmp/ams-object-store/"
>                  :subsystems (list (make-instance 'store-object-subsystem))
>
> Could please advice? Thanks!
>
> --
> Kamen TOMOV
> _______________________________________________
> bknr-devel mailing list
> bknr-devel at common-lisp.net
> http://common-lisp.net/cgi-bin/mailman/listinfo/bknr-devel
>


From kamen at cybuild.com  Sat Sep 16 10:16:51 2006
From: kamen at cybuild.com (Kamen TOMOV)
Date: Sat, 16 Sep 2006 13:16:51 +0300
Subject: [bknr-devel] problem deleting datastore objects and multiple
	inheritance
In-Reply-To: <fd2982320609150824r1b70a706h1f25c0a8530c9eb3@mail.gmail.com>
	(Hans Huebner's message of "Fri, 15 Sep 2006 17:24:45 +0200")
References: <uejudnsw7.fsf@cybuild.com>
	<fd2982320609150728m2394767bq3585d6b1b98df03e@mail.gmail.com>
	<u1wqdnov8.fsf@cybuild.com>
	<fd2982320609150824r1b70a706h1f25c0a8530c9eb3@mail.gmail.com>
Message-ID: <uu038m7zg.fsf@cybuild.com>

On ?????, ????????? 15 2006, Hans Huebner wrote:

> I still believe that the datastore approach is right, and I don?t
> expect to change my opinion.  "Maintenance mode" means that I do not
> currently have new projects based on BKNR, so I am supporting my two
> existing projects and that?s about it.

It is great to know that :-)

-- 
Kamen TOMOV