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i am currently developing an application for iOS which needs to communicate with a hardware device using a Socket Connection. Therefore i am using a Singleton Object with NSStream. To this point all works as expected.

The problem is if the connection is terminated, or interrupted it is not possible to reopen it (this is stated in the Documentation). So my idea is to destroy the Singleton and recreate it. This should not interfere with the Singleton Pattern, because it states that there only exists one copy of such a class.

Has anyone an idea how to solve this problem? Any other solution not involving the recreation of the singleton would be highly appreciated.

LorenJaffrey
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    Why are you using a singleton? The fact that you need to destroy and recreate the singleton is a strong indication that you shouldn't be using a singleton. – mttrb Oct 26 '12 at 14:42
  • why don't you try to use a `plist` file on device and update it when you need it? – SpaceDust__ Oct 26 '12 at 14:44

3 Answers3

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Singleton are not made to be destroyed, probably you should include a method to re-open the singleton class and close/reset old connections.

Andrea
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Why not put some logic in your singleton class to test if the connection to the device is active. If it has died, close the connection, and open a new one. This is effectively the same thing you are trying to do by destroying a recreating the singleton, but doesn't abuse the singleton pattern quite as much. It should also be simpler, because only the singleton knows about the connection, and thus keeps coupling low.

hukir
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The heart of Singleton that lets you create a variable once, and only, this means it will live along your app till it is terminated. We init it as Lazy loading, means when it is used, then initial it. It will allocate in RAM as static, and thus we can call it to reuse anytime, this is really save time. So MUST NOT destroy Singleton, just do some logic inside it.

Hope this help.

Nghia Luong
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