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29 lines
861 B
Swift
29 lines
861 B
Swift
/*
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Copyright (C) 2015 Apple Inc. All Rights Reserved.
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See LICENSE.txt for this sample’s licensing information
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Abstract:
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This file defines the OperationObserver protocol.
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*/
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import Foundation
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/**
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The protocol that types may implement if they wish to be notified of significant
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operation lifecycle events.
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*/
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protocol OperationObserver {
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/// Invoked immediately prior to the `Operation`'s `execute()` method.
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func operationDidStart(operation: Operation)
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/// Invoked when `Operation.produceOperation(_:)` is executed.
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func operation(operation: Operation, didProduceOperation newOperation: NSOperation)
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/**
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Invoked as an `Operation` finishes, along with any errors produced during
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execution (or readiness evaluation).
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*/
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func operationDidFinish(operation: Operation, errors: [NSError])
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}
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