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POHow Do I Make Sure That Dispatch Notify is Called at the Right Time
 

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  1. POHow Do I Make Sure That Dispatch Notify is Called at the Right Time
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    <p>I have scenario where I have to iterate over a list of account numbers, go and fetch the detail information for these accounts and then pass the aggregated information to completionBlock. In order to facilitate this I'm using dispatch_group_* methods. Unfortunately, the completion block is being called <em>before</em> the group has finished even though I have explicitly called </p> <p><code>dispatch_group_wait(_imfDispatchGroup, DISPATCH_TIME_FOREVER);</code></p> <p>Example of console log (original):</p> <blockquote> <p>2012-10-28 13:58:46.722 ThreadingHell[81909:303] inside loginResponse</p> <p>2012-10-28 13:58:46.724 ThreadingHell[81909:303] inside account loop for obj: account1</p> <p>2012-10-28 13:58:46.724 ThreadingHell[81909:303] inside account loop for obj: account2</p> <p>2012-10-28 13:58:46.724 ThreadingHell[81909:1b03] inside details: L0i6kRVzGG details</p> <p>2012-10-28 13:58:46.724 ThreadingHell[81909:1a03] inside details: SE0QjhO8Hh details</p> <p>2012-10-28 13:58:46.724 ThreadingHell[81909:303] inside account loop for obj: account3</p> <p>2012-10-28 13:58:46.725 ThreadingHell[81909:1a03] inside completion for __66-[ModelManager getAccountDetailsForAccountNumber:completionBlock:]_block_invoke_015</p> <p>2012-10-28 13:58:46.725 ThreadingHell[81909:1803] inside details: 9SsGYOX3u5 details</p> <p>2012-10-28 13:58:46.725 ThreadingHell[81909:1a03] details are found for account</p> <p>2012-10-28 13:58:46.725 ThreadingHell[81909:303] inside account loop for obj: account4</p> <p>2012-10-28 13:58:46.725 ThreadingHell[81909:1b03] inside completion for __66-[ModelManager getAccountDetailsForAccountNumber:completionBlock:]_block_invoke_015</p> <p>2012-10-28 13:58:46.726 ThreadingHell[81909:1803] inside completion for __66-[ModelManager getAccountDetailsForAccountNumber:completionBlock:]_block_invoke_015</p> <p>2012-10-28 13:58:46.726 ThreadingHell[81909:303] inside account loop for obj: acount5</p> <p>2012-10-28 13:58:46.726 ThreadingHell[81909:1a03] success account looop</p> <p>2012-10-28 13:58:46.726 ThreadingHell[81909:1b03] details are found for account</p> <p>2012-10-28 13:58:46.726 ThreadingHell[81909:2303] inside details: wSXis5bIVs details</p> <p>2012-10-28 13:58:46.728 ThreadingHell[81909:1803] details are found for account</p> <p>2012-10-28 13:58:46.728 ThreadingHell[81909:2403] inside details: SrIfbzBLr7 details</p> <p>2012-10-28 13:58:46.728 ThreadingHell[81909:1a03] current instance of accountDetails: ( "L0i6kRVzGG details" )</p> <p>2012-10-28 13:58:46.728 ThreadingHell[81909:1803] success account looop</p> <p>2012-10-28 13:58:46.728 ThreadingHell[81909:1b03] success account looop</p> <p>2012-10-28 13:58:46.729 ThreadingHell[81909:2403] inside completion for __66-[ModelManager getAccountDetailsForAccountNumber:completionBlock:]_block_invoke_015</p> <p>2012-10-28 13:58:46.729 ThreadingHell[81909:303] !!!!!!!!!! about to call completion block. This should be last</p> <p>2012-10-28 13:58:46.729 ThreadingHell[81909:2303] inside completion for __66-[ModelManager getAccountDetailsForAccountNumber:completionBlock:]_block_invoke_015</p> <p>2012-10-28 13:58:46.730 ThreadingHell[81909:1803] current instance of accountDetails: ( "L0i6kRVzGG details", "9SsGYOX3u5 details" )</p> <p>2012-10-28 13:58:46.730 ThreadingHell[81909:1b03] current instance of accountDetails: ( "L0i6kRVzGG details", "9SsGYOX3u5 details", "SE0QjhO8Hh details" )</p> <p>2012-10-28 13:58:46.731 ThreadingHell[81909:2403] details are found for account</p> <p>2012-10-28 13:58:46.731 ThreadingHell[81909:2303] details are found for account</p> <p>2012-10-28 13:58:46.732 ThreadingHell[81909:2403] success account looop</p> <p>2012-10-28 13:58:46.731 ThreadingHell[81909:303] obj: { }</p> <p>2012-10-28 13:58:46.732 ThreadingHell[81909:2303] success account looop</p> <p>2012-10-28 13:58:46.732 ThreadingHell[81909:303] error: (null)</p> <p>2012-10-28 13:58:46.732 ThreadingHell[81909:2403] current instance of accountDetails: ( "L0i6kRVzGG details", "9SsGYOX3u5 details", "SE0QjhO8Hh details", "wSXis5bIVs details" )</p> </blockquote> <p>// UPDATED LOG from latest commit [https://github.com/kwylez/ThreadingHell/tree/80cc29fab142b4dc1f386df747c5142b28e2dd84]</p> <blockquote> <p>2012-10-28 16:32:38.984 ThreadingHell[83171:303] inside loginResponse 2012-10-28 16:32:38.987 ThreadingHell[83171:303] inside account loop for obj: account1 2012-10-28 16:32:38.987 ThreadingHell[83171:303] inside account loop for obj: account2 2012-10-28 16:32:38.987 ThreadingHell[83171:1b03] inside details: CP3ioYdvXp details 2012-10-28 16:32:38.987 ThreadingHell[83171:303] inside account loop for obj: account3 2012-10-28 16:32:38.987 ThreadingHell[83171:1a03] inside details: 6k635XoJOV details 2012-10-28 16:32:38.987 ThreadingHell[83171:1b03] inside completion for __66-[ModelManager getAccountDetailsForAccountNumber:completionBlock:]_block_invoke_0 2012-10-28 16:32:38.988 ThreadingHell[83171:1a03] inside completion for __66-[ModelManager getAccountDetailsForAccountNumber:completionBlock:]_block_invoke_0 2012-10-28 16:32:38.988 ThreadingHell[83171:1b03] details are found for account 2012-10-28 16:32:38.988 ThreadingHell[83171:303] inside account loop for obj: account4 2012-10-28 16:32:38.988 ThreadingHell[83171:1803] inside details: 2TjGF1fdaZ details 2012-10-28 16:32:38.989 ThreadingHell[83171:1a03] details are found for account 2012-10-28 16:32:38.990 ThreadingHell[83171:1b03] success account looop 2012-10-28 16:32:38.991 ThreadingHell[83171:1b03] current instance of accountDetails: ( "CP3ioYdvXp details" ) 2012-10-28 16:32:38.990 ThreadingHell[83171:303] inside account loop for obj: acount5 2012-10-28 16:32:38.990 ThreadingHell[83171:2303] inside details: 0YiuX9gHsu details 2012-10-28 16:32:38.990 ThreadingHell[83171:1a03] success account looop 2012-10-28 16:32:38.990 ThreadingHell[83171:1803] inside completion for __66-[ModelManager getAccountDetailsForAccountNumber:completionBlock:]_block_invoke_0 2012-10-28 16:32:38.992 ThreadingHell[83171:2303] inside completion for __66-[ModelManager getAccountDetailsForAccountNumber:completionBlock:]_block_invoke_0 2012-10-28 16:32:38.992 ThreadingHell[83171:1b03] inside details: 9RcyOfjRa5 details 2012-10-28 16:32:38.992 ThreadingHell[83171:1a03] current instance of accountDetails: ( "CP3ioYdvXp details", "6k635XoJOV details" ) 2012-10-28 16:32:38.992 ThreadingHell[83171:1803] details are found for account 2012-10-28 16:32:39.005 ThreadingHell[83171:1803] success account looop 2012-10-28 16:32:39.005 ThreadingHell[83171:1b03] inside completion for __66-[ModelManager getAccountDetailsForAccountNumber:completionBlock:]_block_invoke_0 2012-10-28 16:32:39.005 ThreadingHell[83171:2303] details are found for account 2012-10-28 16:32:39.006 ThreadingHell[83171:1b03] details are found for account 2012-10-28 16:32:39.006 ThreadingHell[83171:2303] success account looop 2012-10-28 16:32:39.006 ThreadingHell[83171:1803] current instance of accountDetails: ( "CP3ioYdvXp details", "6k635XoJOV details", "2TjGF1fdaZ details" ) 2012-10-28 16:32:39.007 ThreadingHell[83171:1b03] success account looop 2012-10-28 16:32:39.007 ThreadingHell[83171:2303] current instance of accountDetails: ( "CP3ioYdvXp details", "6k635XoJOV details", "2TjGF1fdaZ details", "0YiuX9gHsu details" ) 2012-10-28 16:32:39.008 ThreadingHell[83171:1b03] current instance of accountDetails: ( "CP3ioYdvXp details", "6k635XoJOV details", "2TjGF1fdaZ details", "0YiuX9gHsu details", "9RcyOfjRa5 details" ) 2012-10-28 16:32:39.008 ThreadingHell[83171:303] !!!!!!!!!! about to call completion block. This should be last 2012-10-28 16:32:39.009 ThreadingHell[83171:303] obj: { } 2012-10-28 16:32:39.009 ThreadingHell[83171:303] error: (null)</p> </blockquote> <p>What "order of operation" have I missed?</p> <p>Here is link to example project on github (code was too much to put here): </p> <p><a href="https://github.com/kwylez/ThreadingHell" rel="nofollow">https://github.com/kwylez/ThreadingHell</a></p>
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    1. USCory D. Wiles
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    1. CO+1 for the project name.
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    2. COI updated the project and have gotten a bit closer. All "blocks" are excuting in the correct order, but final array is empty when putting back on final completionBlock. I edited the original question with new log to compare
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      1. USCory D. Wiles
 

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