DelayedJob

Run a task at a later time. Subsequent requests to run the job while there's already one scheduled will result in either the already scheduled job to be canceled or the new run to be ignored. Whether to prioritize runs scheduled for sooner or for later can be configured.

Uses

This can be useful, for instance, if you'd like to initiate a network request as the user is typing but only if the user stops typing for at least a second in order to not fire off too many unnecessary network requests.

let networkRequest = DelayedJob(prioritize: .later) { networkFetcher.sendRequest(searchText) }

func editingDidChange(sender: UITextField) {
    searchText = sender.text
    networkRequest.run(withDelay: 1)
}

Using the .later priority, if a run is requested before the existing run has fired, the previously scheduled run is canceled and the new one is scheduled. That way the network request will only actually be run when the user stops typing for more than a second.

Installation

Cocoapods

Add this to your Podfile:

target 'MyApp' do 
    use_frameworks! # Remove this line to use as a static framework
    
    pod 'DelayedJob'
end

And run pod install

Swift Package Manager

Via `swift package`

Add this repo to your Package.swift dependencies:

.package(url: "https://github.com/toastersocks/DelayedJob", from: "1.0.0"),

And add Delayed Job as a dependency of your target

.target(
    name: "MyTarget",
    dependencies: ["DelayedJob"]),
.testTarget(
    name: "MyTargetTests",
    dependencies: ["MyTarget"]),

All together:

// swift-tools-version:5.0
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "MyExecutableOrLibrary",
    platforms: [.macOS(.v10_12), .iOS(.v10), .tvOS(.v10), .watchOS(.v3)], // <-- for Apple platforms, add at least one platform. For non-Apple platforms, this isn't necessary.
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        .package(url: "https://github.com/toastersocks/DelayedJob", from: "1.0.0"),
    ],
    targets: [
        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
        .target(
            name: "MyTarget",
            dependencies: ["DelayedJob"]),
        .testTarget(
            name: "MyTargetTests",
            dependencies: ["MyTarget"]),
    ]
)

Via Xcode

If you're using Xcode 11 or higher, you can use the Swift Package Manager integration in Xcode.

Select your .xcproject file
Select the project under PROJECT
Select Swift Package
Tap the + sign
Paste this repo's address https://github.com/toastersocks/DelayedJob into the text field and hit Next
Choose your version/branch on the next screen
Choose your targets and hit Finish!
Wow 🤯

Carthage

Add this to your Cartfile

github "toastersocks/DelayedJob" ~> "1.0.0"

And follow the directions here: https://github.com/Carthage/Carthage#adding-frameworks-to-an-application

Testing

If you're on a non-Linux platform and want to test on Linux and/or Linux on ARM, there are two files in the bin folder that will run the tests via Docker.
To run them both, make them executable and then from the project root:

./bin/*Test.sh

(The arm6 (Raspberry Pi Zero and Original Pi) tests are currently failing)

License

toastersocks/DelayedJob

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