Question about AddStorageAndWait. #121

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2025-12-29T18:23:13+01:00

adam commented

2025-12-29 18:23:13 +01:00

Originally created by @ghost on GitHub (Jan 21, 2017).

I took reference to the example code creating a datastack like so.

    struct Static {

   static let datastack: DataStack = {
   let datastack = DataStack(modelName: "Persistence")
   try! datastack.addStorageAndWait((SQLiteStore(fileName: "Persistence",     localStorageOptions: .recreateStoreOnModelMismatch)))
   return datastack
     }()
    }

However my concern is that I'm using Static.datastack everywhere to reference the datastack. Wouldn't it keep adding a Storage every single time I reference it somewhere. For example every time I would call Static.datastack.beginAsynchronous, which is called dozens of times in the lifetime of the app.

Originally created by @ghost on GitHub (Jan 21, 2017). I took reference to the example code creating a datastack like so. struct Static { static let datastack: DataStack = { let datastack = DataStack(modelName: "Persistence") try! datastack.addStorageAndWait((SQLiteStore(fileName: "Persistence", localStorageOptions: .recreateStoreOnModelMismatch))) return datastack }() } However my concern is that I'm using Static.datastack everywhere to reference the datastack. Wouldn't it keep adding a Storage every single time I reference it somewhere. For example every time I would call Static.datastack.beginAsynchronous, which is called dozens of times in the lifetime of the app.

adam added the question label 2025-12-29 18:23:13 +01:00

adam closed this issue

2025-12-29 18:23:14 +01:00

adam commented

2025-12-29 18:23:14 +01:00

@JohnEstropia commented on GitHub (Jan 22, 2017):

This syntax uses an inline closure call to initialize the stack, which gets called once the first time it is called. I think you are confusing it with computed variables. Note the difference in the syntax:

var something: DataStack = {
    // ...
}() // This is a function CALL; runs once

var something: DataStack {
    // ...
} // This is a function BODY; runs everytime

@JohnEstropia commented on GitHub (Jan 22, 2017): This syntax uses an inline closure call to initialize the stack, which gets called once the first time it is called. I think you are confusing it with computed variables. Note the difference in the syntax: ```swift var something: DataStack = { // ... }() // This is a function CALL; runs once ``` ```swift var something: DataStack { // ... } // This is a function BODY; runs everytime ```

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Reference: starred/CoreStore-JohnEstropia#121