73 lines
4.2 KiB
Plaintext
73 lines
4.2 KiB
Plaintext
-- begin LEGACY CODE ---------------------------------------------------------------------------------------------------------------------
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-- end LEGACY CODE ---------------------------------------------------------------------------------------------------------------------
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-- begin AUDIBLE DETAILS ---------------------------------------------------------------------------------------------------------------------
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alternate book id (eg BK_RAND_006061) is called 'sku' , 'sku_lite' , 'prod_id' , 'product_id' in different parts of the site
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-- end AUDIBLE DETAILS ---------------------------------------------------------------------------------------------------------------------
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-- begin SOLUTION LAYOUT ---------------------------------------------------------------------------------------------------------------------
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core libraries
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extend Standard Libraries
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additional simple libraries for general purpose programming
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utils: domain ignorant
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domain: biz logic
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db ignorant
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db, domain objects
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domain internal utilities: domain aware. db ignorant
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domain utilities: domain aware. db aware
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incl non-db persistence. unless it needs to be tied into a db intercepter
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all user-provided data must be backed up to json
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application
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do NOT combine jsons for
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- audible-scraped persistence: library, book details
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- libation-generated persistence: FilePaths.json
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- user-defined persistence: BookTags.json
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-- end SOLUTION LAYOUT ---------------------------------------------------------------------------------------------------------------------
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-- begin EF CORE ---------------------------------------------------------------------------------------------------------------------
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transaction notes
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-----------------
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// https://msdn.microsoft.com/en-us/data/dn456843.aspx
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// Rollback is called by transaction Dispose(). No need to call it explicitly
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using var dbContext = new LibationContext();
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using var dbContextTransaction = dbContext.Database.BeginTransaction();
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refreshAction(dbContext, productItems);
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dbContext.SaveChanges();
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dbContextTransaction.Commit();
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aggregate root is transactional boundary
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// //context.Database.CurrentTransaction
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//var dbTransaction = Microsoft.EntityFrameworkCore.Storage.DbContextTransactionExtensions.GetDbTransaction(context.Database.CurrentTransaction);
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// // test with and without : using TransactionScope scope = new TransactionScope();
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//System.Transactions.Transaction.Current.TransactionCompleted += (sender, e) => { };
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// also : https://docs.microsoft.com/en-us/dotnet/api/system.transactions.transaction.enlistvolatile
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pattern when using 1 db context per form
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public Ctor()
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{
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InitializeComponent();
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// dispose context here only. DO NOT dispose in OnParentChanged(). parent form will call dispose after this one has been switched.
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// disposing context prematurely can result in:
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// The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.
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this.Disposed += (_, __) => context?.Dispose();
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}
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-- end EF CORE ---------------------------------------------------------------------------------------------------------------------
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-- begin ASYNC/AWAIT ---------------------------------------------------------------------------------------------------------------------
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Using Async and Await to update the UI Thread <20> Stephen Haunts { Coding in the Trenches }
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https://stephenhaunts.com/2014/10/14/using-async-and-await-to-update-the-ui-thread/
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Using Async and Await to update the UI Thread Part 2 <20> Stephen Haunts { Coding in the Trenches }
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https://stephenhaunts.com/2014/10/16/using-async-and-await-to-update-the-ui-thread-part-2/
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Simple Async Await Example for Asynchronous Programming <20> Stephen Haunts { Coding in the Trenches }
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https://stephenhaunts.com/2014/10/10/simple-async-await-example-for-asynchronous-programming/
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Async and Await -- Stephen Cleary's famous intro
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https://blog.stephencleary.com/2012/02/async-and-await.html
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Async-Await - Best Practices in Asynchronous Programming -- Stephen Cleary
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https://msdn.microsoft.com/en-us/magazine/jj991977.aspx
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-- end ASYNC/AWAIT ---------------------------------------------------------------------------------------------------------------------
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