60 lines
2.0 KiB
Swift
60 lines
2.0 KiB
Swift
import SessionUtilitiesKit
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@objc(SNJobQueue)
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public final class JobQueue : NSObject, JobDelegate {
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@objc public static let shared = JobQueue()
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@objc public func add(_ job: Job, using transaction: Any) {
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job.id = UUID().uuidString
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Configuration.shared.storage.persist(job, using: transaction)
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job.delegate = self
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job.execute()
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}
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public func handleJobSucceeded(_ job: Job) {
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Configuration.shared.storage.withAsync({ transaction in
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Configuration.shared.storage.markJobAsSucceeded(job, using: transaction)
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}, completion: {
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// Do nothing
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})
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}
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public func handleJobFailed(_ job: Job, with error: Error) {
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job.failureCount += 1
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let storage = Configuration.shared.storage
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storage.withAsync({ transaction in
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storage.persist(job, using: transaction)
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}, completion: { // Intentionally capture self
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if job.failureCount == type(of: job).maxFailureCount {
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storage.withAsync({ transaction in
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storage.markJobAsFailed(job, using: transaction)
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}, completion: {
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// Do nothing
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})
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} else {
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let retryInterval = self.getRetryInterval(for: job)
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Timer.weakScheduledTimer(withTimeInterval: retryInterval, target: self, selector: #selector(self.retry(_:)), userInfo: job, repeats: false)
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}
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})
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}
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private func getRetryInterval(for job: Job) -> TimeInterval {
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// Arbitrary backoff factor...
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// try 1 delay: 0.00s
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// try 2 delay: 0.19s
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// ...
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// try 5 delay: 1.30s
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// ...
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// try 11 delay: 61.31s
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let backoffFactor = 1.9
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let maxBackoff: Double = 60 * 60 * 1000
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return 0.1 * min(maxBackoff, pow(backoffFactor, Double(job.failureCount)))
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}
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@objc private func retry(_ job: Any) {
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guard let job = job as? Job else { return }
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job.execute()
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}
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}
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