From: James Edward Gray II <james@...>
Date: 2006-02-02T01:09:58+09:00
Subject: Re: memoize to a file

On Feb 1, 2006, at 9:56 AM, ara.t.howard@noaa.gov wrote:

> On Thu, 2 Feb 2006, James Edward Gray II wrote:
>
>> On Feb 1, 2006, at 9:31 AM, ara.t.howard@noaa.gov wrote:
>>
>>> why not pstore - it's done all that already and is built-in?
>>
>> PStore is just a wrapper on top of Marshal for transactional file  
>> storage. If you need transactions, it's great.  Otherwise, you  
>> might as well just use Marshal.
>
> it's not quite only that.  it also
>
>   - does some simple checks when creating the file (readability, etc)
>   - allows db usage to be multi-processed
>   - supports deletion
>   - rolls backs writes on exceptions / commits using ensure to  
> avoid corrupt
>     data file
>   - handles read vs write actions using shared/excl locks to boost  
> concurrency
>   - uses  md5 check to avoid un-needed writes
>   - opens in correct modes for all platforms

These are all great points.  Thanks for the lesson.  ;)

James Edward Gray II