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From "Jakob Homan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (GIRAPH-80) Don't expose the list holding the messages in BasicVertex
Date Mon, 14 Nov 2011 18:44:51 GMT

    [ https://issues.apache.org/jira/browse/GIRAPH-80?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13149808#comment-13149808
] 

Jakob Homan commented on GIRAPH-80:
-----------------------------------

+1.  We should avoid return whole lists in general. Iterators are more future-proof against
the time when we'll be doing tricks to avoid running out of memory when working when huge,
dense graphs.  The fewer implementation details we leak, the easier our lives will be.
                
> Don't expose the list holding the messages in BasicVertex
> ---------------------------------------------------------
>
>                 Key: GIRAPH-80
>                 URL: https://issues.apache.org/jira/browse/GIRAPH-80
>             Project: Giraph
>          Issue Type: Improvement
>    Affects Versions: 0.70.0
>            Reporter: Sebastian Schelter
>
> I'm currently trying to implement my own memory efficient vertex (similar to LongDoubleFloatDoubleVertex)
and ran into problems with getMsgList()
> This method returns a list pointing to the messages of the vertex and it is modified
externally (BasicRPCCommunications calls clear() and addAll() e.g.). This makes it very hard
to use something else than a java.util.List internally (LongDoubleFloatDoubleVertex "hacked"
around this) and it is generally dangerous to have the internal state of an object be modified
externally. It also makes the code harder to read and understand.
> I'd suggest to change the API to let a vertex handle the modifications itself internally
(e.g. add something like pushMessages(...))

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