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From "Thorsten Scherler (JIRA)" <>
Subject [jira] Commented: (DROIDS-48) Support prioritizing in the TaskQueue
Date Thu, 18 Jun 2009 09:12:07 GMT


Thorsten Scherler commented on DROIDS-48:

Hmm, yeah sounds more flexible for the future and I see the point to store related infos.
I like it.

> Support prioritizing in the TaskQueue
> -------------------------------------
>                 Key: DROIDS-48
>                 URL:
>             Project: Droids
>          Issue Type: New Feature
>          Components: core
>    Affects Versions: 0.01
>            Reporter: Mingfai Ma
>         Attachments: DROIDS-48d.patch, DROIDS-48d2.patch
> Use case:
>  - when looping a directory, (imagine someone is too stupid and dunno the dmoz database
can be downloaded and try to crawl it with Droids) we got collect a lot of links that will
be handled later. assume the requirement is to fetch dmoz directory +1 link outside,
In the original mechanism, it will keep adding new links to the TaskQueue. Ideally, there
should be a mechanism to give a higher priority to the links, so when non-dmoz
links are added, they are processed first, and be removed from the TaskQueue asap.
> with the patch in DROIDS-47, a constructor is added to the SimpleTaskQueue to support
a custom Queue. This issue suggests to change the SimpleTaskQueue to use a PriorityBlockingQueue
by default, and add a getWeight to the Task interface
> I'm also thinking about a more complex TaskQueue. to be discussed in the mail list later.

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