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https://issues.apache.org/jira/browse/HAMA-502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204573#comment-13204573
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Thomas Jungblut commented on HAMA-502:
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I like it. At least, this is now typesafe.
In anycase we should make all the generics in BSP and BSPPeer <? extends
Writable>.
> Message API Improvement
> -----------------------
>
> Key: HAMA-502
> URL: https://issues.apache.org/jira/browse/HAMA-502
> Project: Hama
> Issue Type: Improvement
> Components: bsp
> Affects Versions: 0.4.0
> Reporter: Thomas Jungblut
> Assignee: Edward J. Yoon
> Labels: newbie
> Fix For: 0.5.0
>
> Attachments: generic.patch, v02.patch
>
>
> Accordingly what we have discussed on the mailing list, we want to switch the
> API from the restricted BSPMessage type to <? extends Writable>.
> So send is going to look like this:
> bq. public final void send(String peerName, <? extends Writable> msg)
> And receive:
> bq. public final <? extends Writable> getCurrentMessage()
> There should be no backward compatibility issues because BSPMessage is
> currently a "child" of Writable.
> All the related class are:
> Interface: BSPPeer, MessageManager
> Class: BSPPeerImpl, HadoopMessageManagerImpl
> Maybe other class like BSPMessageBundle must be widened to use <? extends
> Writable>.
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