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From "Jake Mannix (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-36) Ensure that subclassing BasicVertex is possible by user apps
Date Mon, 31 Oct 2011 06:48:32 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-36?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139962#comment-13139962
] 

Jake Mannix commented on GIRAPH-36:
-----------------------------------

Regarding 1) - I guess I can see how VertexReader could be an abstract base class which hangs
onto the GraphState, and instantiates the BasicVertex instances for its subclasses, using
the private GraphState reference, and passing it to an abstract initializeVertex(BasicVertex<I,V,E,M>
v) method to be populated via the (newly added in this patch) BasicVertex#initialize(<lotso
args>) method.

Thinking further on 2) - am I just not seeing how we could easily make VertexReader act like
an Iterator / factory for BasicVertex instances without typing it by the type of the thing
it's to instantiate?
                
> Ensure that subclassing BasicVertex is possible by user apps
> ------------------------------------------------------------
>
>                 Key: GIRAPH-36
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-36
>             Project: Giraph
>          Issue Type: Improvement
>          Components: graph
>    Affects Versions: 0.70.0
>            Reporter: Jake Mannix
>            Assignee: Jake Mannix
>            Priority: Blocker
>             Fix For: 0.70.0
>
>         Attachments: GIRAPH-36.diff
>
>
> Original assumptions in Giraph were that all users would subclass Vertex (which extended
MutableVertex extended BasicVertex).  Classes which wish to have application specific data
structures (ie. not a TreeMap<I, Edge<I,E>>) may need to extend either MutableVertex
or BasicVertex.  Unfortunately VertexRange extends ArrayList<Vertex>, and there are
other places where the assumption is that vertex classes are either Vertex, or at least MutableVertex.
> Let's make sure the internal APIs allow for BasicVertex to be the base class.

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