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

[Trustin Lee (JIRA)]

ChannelLocal (as a counterpart of ThreadLocal)
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                 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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