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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2025 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
package import SWBCore
package import SWBUtil
import Synchronization
package final class TaskStore {
package enum Error: Swift.Error {
case duplicateTaskIdentifier
}
private var tasks: [TaskIdentifier: (Task, Task.Storage.InternedStorage.Handles)]
private let stringArena = StringArena()
private let byteStringArena = ByteStringArena()
init() {
tasks = [:]
}
package func insertTask(_ task: Task) throws -> TaskIdentifier {
let id = task.identifier
guard !tasks.keys.contains(id) else {
throw Error.duplicateTaskIdentifier
}
tasks[id] = (task, task.internedStorage(byteStringArena: byteStringArena, stringArena: stringArena))
return id
}
func freeze() -> FrozenTaskStore {
let frozenStringArena = stringArena.freeze()
let frozenByteStringArena = byteStringArena.freeze()
let internedTasks = self.tasks.mapValues { taskAndStorage in
Task(task: taskAndStorage.0, internedStorageHandles: taskAndStorage.1, frozenByteStringArena: frozenByteStringArena, frozenStringArena: frozenStringArena)
}
return FrozenTaskStore(tasks: internedTasks, stringArena: frozenStringArena, byteStringArena: frozenByteStringArena)
}
}
// TaskStore is not Sendable
@available(*, unavailable) extension TaskStore: Sendable {}
package final class FrozenTaskStore: Sendable {
fileprivate init(tasks: [TaskIdentifier : Task], stringArena: FrozenStringArena, byteStringArena: FrozenByteStringArena) {
self.tasks = tasks
self.stringArena = stringArena
self.byteStringArena = byteStringArena
}
private let tasks: [TaskIdentifier: Task]
private let stringArena: FrozenStringArena
private let byteStringArena: FrozenByteStringArena
package var taskCount: Int {
tasks.count
}
package func forEachTask(_ perform: (Task) -> Void) {
for task in tasks.values {
perform(task)
}
}
package func task(for identifier: TaskIdentifier) -> Task? {
tasks[identifier]
}
package func taskAction(for identifier: TaskIdentifier) -> TaskAction? {
tasks[identifier]?.action
}
/// It is beneficial for the performance of the index queries to have a mapping of tasks in each target.
/// But since this is not broadly useful we only populate this lazily, on demand. This info is not serialized to the build description.
private let tasksByTargetCache: SWBMutex<[ConfiguredTarget?: [Task]]> = .init([:])
/// The tasks associated with a particular target.
package func tasksForTarget(_ target: ConfiguredTarget?) -> [Task] {
return tasksByTargetCache.withLock { tasksByTarget in
tasksByTarget.getOrInsert(target) { tasks.values.filter { $0.forTarget == target } }
}
}
}
extension FrozenTaskStore: Serializable {
package func serialize<T>(to serializer: T) where T : Serializer {
serializer.serialize(Array(tasks.values))
}
package convenience init(from deserializer: any SWBUtil.Deserializer) throws {
let taskArray: [Task] = try deserializer.deserialize()
let byteStringArena = ByteStringArena()
let stringArena = StringArena()
let tasks = Dictionary(uniqueKeysWithValues: taskArray.map { ($0.identifier, ($0, $0.internedStorage(byteStringArena: byteStringArena, stringArena: stringArena))) })
let frozenByteStringArena = byteStringArena.freeze()
let frozenStringArena = stringArena.freeze()
let internedTasks = tasks.mapValues { taskAndStorage in
Task(task: taskAndStorage.0, internedStorageHandles: taskAndStorage.1, frozenByteStringArena: frozenByteStringArena, frozenStringArena: frozenStringArena)
}
self.init(tasks: internedTasks, stringArena: frozenStringArena, byteStringArena: frozenByteStringArena)
}
}
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