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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import Foundation
/// Keeps track of whether an item (a target or file to index) is up-to-date.
actor UpToDateTracker<Item: Hashable> {
private enum Status {
/// The item is up-to-date.
case upToDate
/// The target or file has been marked out-of-date at the given date.
///
/// Keeping track of the date is necessary so that we don't mark a target as up-to-date if we have the following
/// ordering of events:
/// - Preparation started
/// - Target marked out of date
/// - Preparation finished
case outOfDate(Date)
}
private var status: [Item: Status] = [:]
/// Mark the target or file as up-to-date from a preparation/update-indexstore operation started at
/// `updateOperationStartDate`.
///
/// See comment on `Status.outOfDate` why `updateOperationStartDate` needs to be passed.
func markUpToDate(_ items: [Item], updateOperationStartDate: Date) {
for item in items {
switch status[item] {
case .upToDate:
break
case .outOfDate(let markedOutOfDate):
if markedOutOfDate < updateOperationStartDate {
status[item] = .upToDate
}
case nil:
status[item] = .upToDate
}
}
}
func markOutOfDate(_ items: some Collection<Item>) {
let date = Date()
for item in items {
status[item] = .outOfDate(date)
}
}
func markAllKnownOutOfDate() {
markOutOfDate(status.keys)
}
func isUpToDate(_ item: Item) -> Bool {
if case .upToDate = status[item] {
return true
}
return false
}
}
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