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@@ -10,10 +10,14 @@ module StrokeDB
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     end
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     alias :<< :push
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+    # on_receive callback is called when the queue decides do pop
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+    # out an object. If there is no on_receive, it waits for the #pop call.
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     def on_recieve(&block)
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       @on_receive = block || @on_receive
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     end
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+    # Get an object out of the queue. 
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+    # nil is returned when nothing is to be returned.
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     def pop
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       raise "Abstract queue cannot return objects"
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     end