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From "Mingfai Ma (JIRA)" <j...@apache.org>
Subject [jira] Created: (DROIDS-48) Support prioritizing in the TaskQueue
Date Sun, 19 Apr 2009 11:18:47 GMT
Support prioritizing in the TaskQueue
-------------------------------------

                 Key: DROIDS-48
                 URL: https://issues.apache.org/jira/browse/DROIDS-48
             Project: Droids
          Issue Type: New Feature
          Components: core
    Affects Versions: 0.01
            Reporter: Mingfai Ma


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 dmoz.org,
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 non-dmoz.org 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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