Unsubscribe a certain subscription

[haizi-zh]

At default, SubsManager caches all subscriptions in _cacheList and _cacheMap. It seems that there're only three ways to unsubscribe them:

• When the cache is overflown
• When subscriptions are expired
• When clear() is called

However, I think sometimes it might be convenience if one can selectively unsubscribe a certain subscription. Here are some relative issues:

• Are you able to call subs.subscribe("mySub").stop() ?
• SubsManager does not return object with the same API as Meteor.subscribe? (missing stop method)
• Is there an easy way to expireAll() or stopAll() and resubscribeAll()?

I've made several modifications:

• When subscribe is called, it returns a key, which is essentially a JSON string of the subscription arguments. The key can be used to refer to the specified subscription.
• A method named unsubscribe is added. This method accept a subscription key, and stop it selectively.

Hope this can help.

[vladholubiev]

@arunoda any thoughts on this?

[javascriptlove]

@arunoda bump?