[JBoss JIRA] Closed: (NETTY-93) ChannelLocal (as a counterpart of ThreadLocal)

[Trustin Lee (JIRA)]

     [ https://jira.jboss.org/jira/browse/NETTY-93?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Trustin Lee closed NETTY-93.
----------------------------

    Resolution: Done


ChannelLocal has been added to org.jboss.netty.channel

> ChannelLocal (as a counterpart of ThreadLocal)
> ----------------------------------------------
>
>                 Key: NETTY-93
>                 URL: https://jira.jboss.org/jira/browse/NETTY-93
>             Project: Netty
>          Issue Type: Feature Request
>          Components: Core API
>            Reporter: Trustin Lee
>            Assignee: Trustin Lee
>            Priority: Minor
>             Fix For: 3.1.0.ALPHA2
>
>
> There has been requests about adding get/setAttribute(..) to Channel interface.  I don't disagree about the idea, but there's a couple issues with it:
> * Channel interface should be kept minimal.
> * An attribute map is an optional feature - a user can store one's application's state without the attribute map
> * An attribute map often takes up too much space because each Channel conveys a HashMap or ConcurrentHashMap.
> ChannelLocal could be added as an alternative solution for the demand for the attribute map.  It essentially is similar to ThreadLocal.  ChannelLocal stores a value per Channel, while ThreadLocal stores a value per Thread.  By providing ChannelLocal:
> * Channel interface doesn't change.
> * ChannelLocal can be used as an attribute map and it's optional.
> * ChannelLocal maintains a Map per attribute type, and therefore there's low probability of wasting memory.

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