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https://issues.apache.org/jira/browse/DROIDS-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12710225#action_12710225
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Mingfai Ma commented on DROIDS-48:
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any comment to this feature?
could a weight field be added to Task? or could Task be enhanced to support a
map of custom data? without adding weight to the Task interface, this feature
cannot be implemented.
for the Queue, there could be diff options:
1. include in SimpleTaskQueue as provided in this patch, or
2. make a separated TaskQueue implementation, e.g. PrioritizedTaskQueue, or
3. do not include in the distribution (maybe provide in any example)
re. between 1 and 2, the so-called prioritization is not too complex, so I
think it is ok to include SimpleTaskQueue rather than separate to another
queue, if it is to be included in the dist at all.
> 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
> Attachments: DROIDS-48b.patch, DROIDS-48c.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 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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