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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| import Foundation | ||
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| /// A type that provides the moment of a transaction. | ||
| /// | ||
| /// - note: [**🔥 EXPERIMENTAL**](https://github.com/groue/GRDB.swift/blob/master/README.md#what-are-experimental-features) | ||
| /// | ||
| /// ## Topics | ||
| /// | ||
| /// ### Built-in Clocks | ||
| /// | ||
| /// - ``DefaultTransactionClock`` | ||
| /// - ``CustomTransactionClock`` | ||
| public protocol TransactionClock { | ||
| /// Returns the date of the current transaction. | ||
| /// | ||
| /// This function is called whenever a transaction starts - precisely | ||
| /// speaking, whenever the database connection leaves the auto-commit mode. | ||
| /// | ||
| /// It is also called when the ``Database/transactionDate`` property is | ||
| /// called, and the database connection is not in a transaction. | ||
| /// | ||
| /// Related SQLite documentation: <https://www.sqlite.org/c3ref/get_autocommit.html> | ||
| func now(_ db: Database) throws -> Date | ||
| } | ||
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|
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| extension TransactionClock where Self == DefaultTransactionClock { | ||
| /// Returns the default clock. | ||
| public static var `default`: Self { DefaultTransactionClock() } | ||
| } | ||
|
|
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| extension TransactionClock where Self == CustomTransactionClock { | ||
| /// Returns a custom clock. | ||
| /// | ||
| /// The provided closure is called whenever a transaction starts - precisely | ||
| /// speaking, whenever the database connection leaves the auto-commit mode. | ||
| /// | ||
| /// It is also called when the ``Database/transactionDate`` property is | ||
| /// called, and the database connection is not in a transaction. | ||
| public static func custom(_ now: @escaping (Database) throws -> Date) -> Self { | ||
| CustomTransactionClock(now) | ||
| } | ||
| } | ||
|
|
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| /// The default clock. | ||
| public struct DefaultTransactionClock: TransactionClock { | ||
| public func now(_ db: Database) throws -> Date { | ||
| // An opportunity to fetch transaction time from the database when | ||
| // SQLite supports the feature. | ||
| Date() | ||
| } | ||
| } | ||
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| /// A custom transaction clock. | ||
| public struct CustomTransactionClock: TransactionClock { | ||
| let _now: (Database) throws -> Date | ||
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| public init(_ now: @escaping (Database) throws -> Date) { | ||
| self._now = now | ||
| } | ||
|
|
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| public func now(_ db: Database) throws -> Date { | ||
| try _now(db) | ||
| } | ||
| } |
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