[elephant-devel] Problem on the upgrade path

[Ian Eslick]

Ok, I have a few minutes now to look into this.  You're using SBCL -  
on what platform?  -Ian

On May 18, 2008, at 9:52 AM, Leslie P. Polzer wrote:

>
>> That's interesting.  I'll have to look into that further because any
>> existing database should either have the btree already or create it  
>> on
>> startup...
>
> Either the approach from my last mail was faulty, or some other thing
> is afoul; the next open-store threw a deserialization error related to
> this:
>
> 0: (ELEPHANT::DESERIALIZE
>    #S(ELEPHANT-MEMUTIL:BUFFER-STREAM
>       :BUFFER #<SB-ALIEN-INTERNALS:ALIEN-VALUE :SAP #X08084C28 :TYPE  
> (*
>                                                                       (UNSIGNED
>                                                                        8 
> ))>
>       :SIZE 76
>       :POSITION 76
>       :LENGTH 80)
>    #<BDB-STORE-CONTROLLER /home/sky/projects/mystic/backup-world.bdb/>
>    NIL)
> 1: ((SB-PCL::FAST-METHOD ELEPHANT::PERSISTENT-SLOT-READER
>     (DB-BDB::BDB-STORE-CONTROLLER T T))
>    #<unavailable argument>
>    #<unavailable argument>
>    #<unavailable argument>
>    #<unavailable argument>
>    #<unavailable argument>)
> 2: (SLOT-VALUE #<BDB-INDEXED-BTREE oid:-3> DB-BDB::INDICES)
> 3: ((SB-PCL::FAST-METHOD SHARED-INITIALIZE :AFTER
>     (DB-BDB::BDB-INDEXED-BTREE T)) #<unavailable lambda list>) 
> [:EXTERNAL]
>
> [...]
>
>
>> yes, add-class-derived-index has been deprecated in favor of a
>> defclass form.  There is a more detailed e-mail I sent out on this
>> awhile back with some of the tradeoffs and the rationale behind the
>> decisions.
>
> I remember the discussion, but I could't remember anything
> about the new interface. Thanks for explaining!
>
>
>> ((slot1 :accessor slot1)
>>  (slot2 :accessor slot2)
>>  (dslot :accessor dslot :derived-fn 'my-fn :slots-deps (slot1  
>> slot2)))
>>
>> my-fn is the usual derived index key function.
>
> Very good, the old API was quite clumsy to work with.
>
>  Leslie
>
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