Purge by Item Cache

Hi,

I guess you would want something automatic, rather than manually flushing just the prices?

Something you can currently do with the plugin is to turn off ‘Live Data’ in the options page, then when you insert a product into a post it populates the shortcode with data fetched at the time of insertion. Then just need to delete items from the shortcode that you want to be fetched ‘live’ and add the option ‘live=1’ to the shortcode.

e.g.

A completely live link, all data fetched on cache refresh:

[amazon asin=B006O6FGTE&template=wishlist&live=1]

A completely static link, all data provided in shortcode:

[amazon asin=B006O6FGTE&template=wishlist&title=Barbie Dolls of the World W3374 Mexico Doll - Pink Label Collection&artist=Mattel&manufacturer=Mattel&thumb=http://ecx.images-amazon.com/images/I/51vVrSgebbL._SL160_.jpg&rank=92424&rating=-&price=£20.89&live=0]

A partially static link, all but price provided in shortcode, ‘price’ is fetched on cache refresh – set cache age to 2 hours:

[amazon asin=B006O6FGTE&template=wishlist&title=Barbie Dolls of the World W3374 Mexico Doll - Pink Label Collection&artist=Mattel&manufacturer=Mattel&thumb=http://ecx.images-amazon.com/images/I/51vVrSgebbL._SL160_.jpg&rank=92424&rating=-&live=1]

Obvious problems with this are:

1. Harder to put links in the posts in the first place
2. Localised data is not provided
3. Changes to product details are not picked up (do they ever change?)
4. Changing the template content (e.g. adding a new keyword) will be missing from all your shortcodes

As for making this a new feature of the plugin…

Options include:

1. Always exclude price data from the cache, so it is fetched on every page view – probably too slow.
2. A background task that refreshes the price data in all cached items every few hours – feasible, but a bit limited
3. Split the cache into ‘Permanent’ data and ‘Live’ data, the ‘Live’ data is fetched more frequently – perhaps ultimately making the ‘Permanent’ data an editable database – probably the way I’d like to go but quiet a major change in functionality

Needs some thought!

Paul

Hi,

I could probably add an extension that allows you to purge individual items, but it would be the whole item not just the price (but it ‘costs’ [in terms of delay to page loading] as much to retrieve all the item details as it does to just get the price).

Unfortunately turning live on and off does not cause the plugin to flush the item from the cache it just stops it even looking in the cache for the items data.

Let me know if a ‘cache manager’ would be useful and I could probably knock one together in a few days.

Cheers,

Paul

Hi,

Very early version of cache manager plugin, install in your plugins directory and activate in plugins manager:

http://bit.ly/18GSCRo (link valid until 16th August).

Really need to add pagination of cache entries and a search facility…

Paul

Hi,

Sorry just for some reason I thought you were using the development version of the plugin. The cache manager only works with that version, sorry!

You can try it out if you want, it can be downloaded from:

http://downloads.wordpress.org/plugin/amazon-link.zip

Cheers,

Paul