62 lines
1.3 KiB
Swift
62 lines
1.3 KiB
Swift
//
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// FeedlyCompoundOperation.swift
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// Account
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//
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// Created by Kiel Gillard on 10/10/19.
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// Copyright © 2019 Ranchero Software, LLC. All rights reserved.
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//
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import Foundation
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/// An operation with a queue of its own.
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final class FeedlyCompoundOperation: FeedlyOperation {
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private let operationQueue = OperationQueue()
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private var finishOperation: BlockOperation?
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init(operations: [Operation]) {
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assert(!operations.isEmpty)
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operationQueue.isSuspended = true
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finishOperation = nil
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super.init()
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let finish = BlockOperation {
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self.didFinish()
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}
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finishOperation = finish
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for operation in operations {
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finish.addDependency(operation)
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}
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var initialOperations = operations
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initialOperations.append(finish)
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operationQueue.addOperations(initialOperations, waitUntilFinished: false)
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}
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convenience init(operationsBlock: () -> ([Operation])) {
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let operations = operationsBlock()
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self.init(operations: operations)
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}
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override func main() {
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guard !isCancelled else {
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didFinish()
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return
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}
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operationQueue.isSuspended = false
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}
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func addAnotherOperation(_ operation: Operation) {
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guard !isCancelled else { return }
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finishOperation?.addDependency(operation)
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operationQueue.addOperation(operation)
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}
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override func cancel() {
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operationQueue.cancelAllOperations()
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super.cancel()
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}
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}
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