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From "Claudio Squarcella (Issue Comment Edited) (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Edited] (SANDBOX-358) Early return/termination for graph visit
Date Sat, 21 Jan 2012 01:38:40 GMT

    [ https://issues.apache.org/jira/browse/SANDBOX-358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189906#comment-13189906
] 

Claudio Squarcella edited comment on SANDBOX-358 at 1/21/12 1:37 AM:
---------------------------------------------------------------------

Hi,

so I actually changed signatures for methods in {{GraphVisitHandler}}:
* {{discoverVertex}} and {{discoverEdge}} now tell the algorithm if the corresponding {{Vertex}}
and {{Edge}} should be expanded (i.e. if their neighbors should be added to the visit queue);
* {{finishVertex}} and {{finishEdge}} tell if the algorithm can be ended prematurely (because
the search is complete, e.g. the target element was found).

All tests still work. I hope you guys like this one :)
Claudio
                
      was (Author: claudio.squarcella):
    Hi,

so I actually changed signatures for methods in {{GraphVisitHandler}}:
* {{discoverVertex}} and {{discoverEdge}} now tell the algorithm if the corresponding {{Vertex}}
and {{Edge}} should be expanded (i.e. if their neighbors should be added to the visit queue);
* {{finishVertex}} and {{finishEdge}} tell if the algorithm can be ended prematurely (because
the search is complete, e.g. before the target element was found).

All tests still work. I hope you guys like this one :)
Claudio
                  
> Early return/termination for graph visit
> ----------------------------------------
>
>                 Key: SANDBOX-358
>                 URL: https://issues.apache.org/jira/browse/SANDBOX-358
>             Project: Commons Sandbox
>          Issue Type: Improvement
>          Components: Graph
>            Reporter: Claudio Squarcella
>            Assignee: Simone Tripodi
>            Priority: Minor
>              Labels: graph, visit, visithandler
>         Attachments: EarlyTerminationAndSubgraphSkipForSearchAlgorithms.patch
>
>   Original Estimate: 72h
>  Remaining Estimate: 72h
>
> Hello,
> the current implementations in the class {{Visit}} (package {{org.apache.commons.graph.visit}})
do not include the possibility to stop the search prematurely. That would be more natural
(and faster) for many kinds of search, e.g. when looking for the first occurrence of a specific
pattern (vertex, path with certain features, etc).
> The easiest solution: changing all method signatures in {{GraphVisitHandler}} from {{void}}
to {{boolean}}, forcing the handler to answer the question: _should I continue?_ 
> I understand semantics get a bit entangled (well, not with an appropriate documentation!),
so I am open to more verbose options: e.g. a method {{isSearchComplete}} to call after every
step... but that would only be more verbose, wouldn't it?
> Waiting for feedback and ready to patch :-)
> Claudio

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