SwiftQueue

Schedule tasks with constraints made easy.

SwiftQueue is a job scheduler for iOS inspired by popular android libraries like android-priority-jobqueue or android-job. It allows you to run your tasks with run and retry constraints.

Library will rely on Operation and OperationQueue to make sure all tasks will run in order. Don’t forget to check our WIKI.

Features

• [x] Sequential or Concurrent execution
• [x] Persistence
• [x] Cancel all, by id or by tag
• [x] Start / Stop queue

Job Constraints:

• [x] Delay
• [x] Deadline
• [x] Timeout
• [x] Internet
• [x] Charging
• [x] Single instance in queue
• [x] Retry: Max count, exponential backoff
• [x] Periodic: Max run, interval delay
• [x] Experimental Foreground or Background execution

Requirements

• iOS 8.0+, watchOS 2.0+, macOS 10.10+, tvOS 9.0+
• Xcode 11.0

Installation

SwiftPackageManager (SPM)

To integrate using Apple’s Swift package manager, add the following as a dependency to your Package.swift:

.package(url: "https://github.com/lucas34/SwiftQueue.git", .upToNextMajor(from: "4.0.0"))

Carthage

SwiftQueue is carthage compatible. Add the following entry in your Cartfile:

github "lucas34/SwiftQueue"

Then run carthage update.

CocoaPods

You can use CocoaPods to install SwiftQueue by adding it to your Podfile:

platform :ios, '8.0'
use_frameworks!
pod 'SwiftQueue'

In your application, simply import the library

import SwiftQueue

Example

This example will simply wrap an api call. Create your custom job by extending Job with onRun, onRetry and onRemove callbacks.

// A job to send a tweet
class SendTweetJob: Job {
    
    // Type to know which Job to return in job creator
    static let type = "SendTweetJob"
    // Param
    private let tweet: [String: Any]

    required init(params: [String: Any]) {
        // Receive params from JobBuilder.with()
        self.tweet = params
    }

    func onRun(callback: JobResult) {
        let api = Api()
        api.sendTweet(data: tweet).execute(onSuccess: {
            callback.done(.success)
        }, onError: { error in
            callback.done(.fail(error))
        })
    }

    func onRetry(error: Error) -> RetryConstraint {
        // Check if error is non fatal
        return error is ApiError ? RetryConstraint.cancel : RetryConstraint.retry(delay: 0) // immediate retry
    }

    func onRemove(result: JobCompletion) {
        // This job will never run anymore  
        switch result {
            case .success:
                // Job success
            break
            
            case .fail(let error):
                // Job fail
            break
       
        }
    }
}

Create your SwiftQueueManager and keep the reference. If you want to cancel a job it has to be done with the same instance.

let manager = SwiftQueueManagerBuilder(creator: TweetJobCreator()).build()

Schedule your job and specify the constraints.

JobBuilder(type: SendTweetJob.type)
        // Requires internet to run
        .internet(atLeast: .cellular)
        // params of my job
        .with(params: ["content": "Hello world"])
        // Add to queue manager
        .schedule(manager: manager)

Bind your job type with an actual instance.

class TweetJobCreator: JobCreator {

    // Base on type, return the actual job implementation
    func create(type: String, params: [String: Any]?) -> Job {
        // check for job and params type
        if type == SendTweetJob.type  {
            return SendTweetJob(params: params)
        } else {
            // Nothing match
            // You can use `fatalError` or create an empty job to report this issue.
            fatalError("No Job !")
        }
    }
}

3rd Party Extensions

• SQLitePersisterForSwiftQueue: A SQLite3 based persister for SwiftQueue

Contributors

We would love you for the contribution to SwiftQueue, check the LICENSE file for more info.

• Lucas Nelaupe - @lucas34990

License

Distributed under the MIT license. See LICENSE for more information.