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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 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 Dispatch
import IndexStoreDB
import LanguageServerProtocolExtensions
import SKLogging
import SwiftExtensions
/// `IndexDelegate` for the SourceKit workspace.
actor SourceKitIndexDelegate: IndexDelegate {
/// Registered `MainFilesDelegate`s to notify when main files change.
var mainFilesChangedCallbacks: [@Sendable () async -> Void] = []
/// The count of pending unit events. Whenever this transitions to 0, it represents a time where
/// the index finished processing known events. Of course, that may have already changed by the
/// time we are notified.
let pendingUnitCount = AtomicInt32(initialValue: 0)
package init() {}
nonisolated package func processingAddedPending(_ count: Int) {
pendingUnitCount.value += Int32(count)
}
nonisolated package func processingCompleted(_ count: Int) {
pendingUnitCount.value -= Int32(count)
if pendingUnitCount.value == 0 {
Task {
await indexChanged()
}
}
if pendingUnitCount.value < 0 {
// Technically this is not data race safe because `pendingUnitCount` might change between the check and us setting
// it to 0. But then, this should never happen anyway, so it's fine.
logger.fault("pendingUnitCount dropped below zero: \(self.pendingUnitCount.value)")
pendingUnitCount.value = 0
Task {
await indexChanged()
}
}
}
private func indexChanged() async {
logger.debug("IndexStoreDB changed")
for callback in mainFilesChangedCallbacks {
await callback()
}
}
/// Register a delegate to receive notifications when main files change.
package func addMainFileChangedCallback(_ callback: @escaping @Sendable () async -> Void) {
mainFilesChangedCallbacks.append(callback)
}
}
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