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Search found 2 results on 1 pages for 'ozair kafray'.

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• Updating from OSX Lion 10.7.2 to 10.7.4

  - by Ozair Kafray

  I just got my Mac upgraded to 10.7.2, just to be able to install Xcode 4.3.3. However, when I try to install Xcode 4.3.3, it says that it requires a minimum of OSX 10.7.3. Then using the "Software Upgrade" tool it detects successfully for me that a combined upgrade to 10.7.4 is available. As I select Install Item, the download starts however, it fails after complete download (taking two hours) saying something like "the update cannot be saved". I have done this twice already, and followed it up until 5 minutes were left. I have also checked that there is enough space (60 GB) available on my hard disk, while the update requires around 1.5 GB. The question is what is causing the problem mentioned in bold above.

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• How to visualize timer functionality in sequence diagram?

  - by truthseeker

  I am developing software for communication with external device through serial port. To better understand the new functionality I am trying to display it in sequence diagram. Flow of events is as follows. I send to the device command to reset it. This is asynchronous operation so there is some delay between request and response (typically 100 ms). There can be case when the answer never comes (for example device is not connected to the specified port or is currently turned off). For this purpose I create a timer with period twice the maximum answer time. In my case it is 2 * 125 ms = 250 ms. If the answer comes in predefined time interval, I destroy already running timer. If the answer doesnt come in predefined interval, timer initiates some action. After this action we can destroy it. How to effectively model this situation in sequence diagram? Addendum 1: Based on advices made by scarfridge i drew following UML diagram. Comment by Ozair is also helpful for simplifying the diagram even more.

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