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@ -1,5 +1,5 @@ |
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// |
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// BaseCollection.swift |
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// StoredCollection.swift |
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// LeStorage |
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// |
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// Created by Laurent Morvillier on 02/02/2024. |
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@ -8,26 +8,57 @@ |
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import Foundation |
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import Combine |
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public protocol CollectionHolder { |
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associatedtype Item: Storable |
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public protocol SomeCollection<Item>: Identifiable { |
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var items: [Item] { get } |
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func reset() |
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} |
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public protocol SomeCollection: CollectionHolder, Identifiable { |
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associatedtype Item: Storable |
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var resourceName: String { get } |
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var hasLoaded: Bool { get } |
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var inMemory: Bool { get } |
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var type: any Storable.Type { get } |
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func reset() |
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func referenceCount<S: Storable>(type: S.Type, id: String) -> Int |
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var items: [Item] { get } |
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func deleteAllItemsAndDependencies(actionOption: ActionOption) |
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func deleteDependencies(actionOption: ActionOption, _ isIncluded: (Item) -> Bool) |
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func findById(_ id: Item.ID) -> Item? |
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} |
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protocol CollectionDelegate<Item> { |
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associatedtype Item: Storable |
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func loadingForMemoryCollection() async |
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func itemMerged(_ pendingOperation: PendingOperation<Item>) |
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} |
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enum CollectionMethod { |
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case insert |
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case update |
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case delete |
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} |
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public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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public struct ActionResult<T> { |
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var instance: T |
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var method: CollectionMethod |
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var pending: Bool |
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} |
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public struct ActionOption: Codable { |
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var synchronize: Bool |
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var cascade: Bool |
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static let standard: ActionOption = ActionOption(synchronize: false, cascade: false) |
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static let cascade: ActionOption = ActionOption(synchronize: false, cascade: true) |
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static let syncedCascade: ActionOption = ActionOption(synchronize: true, cascade: true) |
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} |
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public class StoredCollection<T: Storable>: SomeCollection { |
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public typealias Item = T |
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/// Doesn't write the collection in a file |
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fileprivate(set) public var inMemory: Bool = false |
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@ -47,7 +78,7 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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/// Indicates whether the collection has changed, thus requiring a write operation |
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fileprivate var _triggerWrite: Bool = false { |
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didSet { |
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if self._triggerWrite == true { |
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if self._triggerWrite == true && self.inMemory == false { |
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self._scheduleWrite() |
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DispatchQueue.main.async { |
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@ -65,6 +96,8 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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/// Sets a max number of items inside the collection |
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fileprivate(set) var limit: Int? = nil |
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fileprivate var _delegate: (any CollectionDelegate<T>)? = nil |
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init(store: Store, inMemory: Bool = false) async { |
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self.store = store |
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if self.inMemory == false { |
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@ -72,13 +105,14 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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} |
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} |
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init(store: Store, indexed: Bool = false, inMemory: Bool = false, limit: Int? = nil, synchronousLoading: Bool = false) { |
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init(store: Store, indexed: Bool = false, inMemory: Bool = false, limit: Int? = nil, synchronousLoading: Bool = false, delegate: (any CollectionDelegate<T>)? = nil) { |
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if indexed { |
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self._indexes = [:] |
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} |
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self.inMemory = inMemory |
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self.store = store |
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self.limit = limit |
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self._delegate = delegate |
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if synchronousLoading { |
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Task { |
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@ -109,7 +143,7 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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// MARK: - Loading |
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/// Sets the collection as changed to trigger a write |
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func triggerWrite() { |
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fileprivate func requestWrite() { |
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self._triggerWrite = true |
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} |
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@ -118,6 +152,7 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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if !self.inMemory { |
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await self.loadFromFile() |
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} else { |
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await self._delegate?.loadingForMemoryCollection() |
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await MainActor.run { |
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self.setAsLoaded() |
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} |
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@ -169,6 +204,19 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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self._updateIndexIfNecessary() |
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} |
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@MainActor |
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func loadAndWrite(_ items: [T], clear: Bool = false) { |
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if clear { |
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self.setItems(items) |
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self.setAsLoaded() |
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} else { |
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self.setAsLoaded() |
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self.addOrUpdate(contentOfs: items) |
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} |
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self.requestWrite() |
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} |
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/// Updates the whole index with the items array |
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fileprivate func _updateIndexIfNecessary() { |
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if self._indexes != nil { |
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@ -180,76 +228,71 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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/// Adds or updates the provided instance inside the collection |
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/// Adds it if its id is not found, and otherwise updates it |
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public func addOrUpdate(instance: T) { |
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self.addOrUpdateItem(instance: instance) |
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@discardableResult public func addOrUpdate(instance: T) -> ActionResult<T> { |
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defer { |
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self.requestWrite() |
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} |
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return self._rawAddOrUpdate(instance: instance) |
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} |
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/// Adds or update an instance inside the collection and writes |
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func addOrUpdateItem(instance: T) { |
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/// Adds or update a sequence of elements |
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public func addOrUpdate(contentOfs sequence: any Sequence<T>, _ handler: ((ActionResult<T>) -> ())? = nil) { |
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defer { |
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self._triggerWrite = true |
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self.requestWrite() |
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} |
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for instance in sequence { |
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let result = self._rawAddOrUpdate(instance: instance) |
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handler?(result) |
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} |
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} |
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fileprivate func _rawAddOrUpdate(instance: T) -> ActionResult<T> { |
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if let index = self.items.firstIndex(where: { $0.id == instance.id }) { |
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self.updateItem(instance, index: index) |
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let updated = self.updateItem(instance, index: index, actionOption: .standard) |
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return ActionResult(instance: instance, method: .update, pending: !updated) |
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} else { |
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self.addItem(instance: instance) |
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let added = self.addItem(instance: instance) |
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return ActionResult(instance: instance, method: .insert, pending: !added) |
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} |
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} |
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/// A method the treat the collection as a single instance holder |
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func setSingletonNoSync(instance: T) { |
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defer { |
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self._triggerWrite = true |
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self.requestWrite() |
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} |
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self.items.removeAll() |
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self.addItem(instance: instance) |
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} |
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/// Deletes the instance in the collection and sets the collection as changed to trigger a write |
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public func delete(instance: T) { |
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public func delete(instance: T, actionOption: ActionOption) { |
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defer { |
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self._triggerWrite = true |
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} |
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self.deleteItem(instance) |
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self.deleteItem(instance, actionOption: actionOption) |
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} |
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/// Deletes all items of the sequence by id and sets the collection as changed to trigger a write |
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public func delete(contentOfs sequence: any RandomAccessCollection<T>) { |
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defer { |
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self._triggerWrite = true |
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public func delete(contentOfs sequence: any RandomAccessCollection<T>, _ handler: ((ActionResult<T>) -> ())? = nil) { |
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self.delete(contentOfs: sequence, actionOption: .cascade, handler: handler) |
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} |
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for instance in sequence { |
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self.deleteItem(instance) |
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} |
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} |
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func delete(contentOfs sequence: any RandomAccessCollection<T>, actionOption: ActionOption, handler: ((ActionResult<T>) -> ())? = nil) { |
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/// Adds or update a sequence of elements |
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public func addOrUpdate(contentOfs sequence: any Sequence<T>) { |
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self.addSequence(sequence) |
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// self._addOrUpdate(contentOfs: sequence) |
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} |
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/// Adds a sequence of objects inside the collection and performs a write |
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func addSequence(_ sequence: any Sequence<T>) { |
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defer { |
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self._triggerWrite = true |
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} |
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for instance in sequence { |
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if let index = self.items.firstIndex(where: { $0.id == instance.id }) { |
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self.updateItem(instance, index: index) |
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} else { // insert |
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self.addItem(instance: instance) |
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let deleted = self.deleteItem(instance, actionOption: actionOption) |
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handler?(ActionResult(instance: instance, method: .delete, pending: !deleted)) |
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} |
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} |
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} |
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/// This method sets the storeId for the given instance if the collection belongs to a store with an id |
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fileprivate func _affectStoreIdIfNecessary(instance: T) { |
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if let storeId = self.store.identifier { |
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@ -261,11 +304,16 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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} |
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} |
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func add(instance: T, actionOption: ActionOption) { |
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self.addItem(instance: instance, actionOption: actionOption) |
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self.requestWrite() |
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} |
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/// Adds an instance to the collection |
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@discardableResult func addItem(instance: T, shouldBeSynchronized: Bool = false) -> Bool { |
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@discardableResult fileprivate func addItem(instance: T, actionOption: ActionOption = .standard) -> Bool { |
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if !self.hasLoaded { |
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self.addPendingOperation(method: .addOrUpdate, instance: instance, shouldBeSynchronized: shouldBeSynchronized) |
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self.addPendingOperation(method: .add, instance: instance, actionOption: actionOption) |
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return false |
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} |
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@ -277,11 +325,16 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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return true |
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} |
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func update(_ instance: T, index: Int, actionOption: ActionOption) { |
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self.updateItem(instance, index: index, actionOption: actionOption) |
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self.requestWrite() |
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} |
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/// Updates an instance to the collection by index |
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@discardableResult func updateItem(_ instance: T, index: Int, shouldBeSynchronized: Bool = false) -> Bool { |
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@discardableResult fileprivate func updateItem(_ instance: T, index: Int, actionOption: ActionOption) -> Bool { |
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if !self.hasLoaded { |
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self.addPendingOperation(method: .addOrUpdate, instance: instance, shouldBeSynchronized: shouldBeSynchronized) |
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self.addPendingOperation(method: .update, instance: instance, actionOption: actionOption) |
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return false |
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} |
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@ -296,15 +349,15 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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} |
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/// Deletes an instance from the collection |
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@discardableResult func deleteItem(_ instance: T, shouldBeSynchronized: Bool = false) -> Bool { |
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@discardableResult fileprivate func deleteItem(_ instance: T, actionOption: ActionOption = .cascade) -> Bool { |
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if !self.hasLoaded { |
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self.addPendingOperation(method: .delete, instance: instance, shouldBeSynchronized: shouldBeSynchronized) |
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self.addPendingOperation(method: .delete, instance: instance, actionOption: actionOption) |
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return false |
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} |
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if shouldBeSynchronized { // when user initiated, we want to cascade delete, but when synchronized, we want the delete notifications to make the job and be sure everything works |
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instance.deleteDependencies(store: self.store, shouldBeSynchronized: shouldBeSynchronized) |
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if actionOption.cascade { // when user initiated, we want to cascade delete, but when synchronized, we want the delete notifications to make the job and be sure everything works |
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instance.deleteDependencies(store: self.store, actionOption: actionOption) |
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} |
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self.localDeleteOnly(instance: instance) |
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@ -312,10 +365,10 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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} |
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/// Deletes an instance from the collection |
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@discardableResult func deleteUnusedShared(_ instance: T, shouldBeSynchronized: Bool = false) -> Bool { |
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@discardableResult func deleteUnusedShared(_ instance: T, actionOption: ActionOption) -> Bool { |
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if !self.hasLoaded { |
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self.addPendingOperation(method: .deleteUnusedShared, instance: instance, shouldBeSynchronized: shouldBeSynchronized) |
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self.addPendingOperation(method: .deleteUnusedShared, instance: instance, actionOption: actionOption) |
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return false |
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} |
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@ -339,6 +392,13 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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} |
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} |
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func deleteByStringId(_ id: String, actionOption: ActionOption = .cascade) { |
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let realId = T.buildRealId(id: id) |
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if let instance = self.findById(realId) { |
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self.deleteItem(instance, actionOption: actionOption) |
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} |
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} |
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/// Returns the instance corresponding to the provided [id] |
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public func findById(_ id: T.ID) -> T? { |
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if let index = self._indexes, let instance = index[id] { |
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@ -361,17 +421,33 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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} |
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} |
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public func deleteAllItemsAndDependencies(actionOption: ActionOption) { |
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self._delete(contentOfs: self.items, actionOption: actionOption) |
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} |
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public func deleteDependencies(actionOption: ActionOption, _ isIncluded: (T) -> Bool) { |
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let items = self.items.filter(isIncluded) |
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self._delete(contentOfs: items, actionOption: actionOption) |
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} |
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fileprivate func _delete(contentOfs sequence: any RandomAccessCollection<T>, actionOption: ActionOption) { |
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for instance in sequence { |
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self.deleteItem(instance, actionOption: actionOption) |
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} |
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} |
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// MARK: - Pending operations |
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func addPendingOperation(method: StorageMethod, instance: T, shouldBeSynchronized: Bool) { |
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func addPendingOperation(method: StorageMethod, instance: T, actionOption: ActionOption) { |
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if self.pendingOperationManager == nil { |
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self.pendingOperationManager = PendingOperationManager<T>(store: self.store, inMemory: self.inMemory) |
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} |
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self._addPendingOperationIfPossible(method: method, instance: instance, shouldBeSynchronized: false) |
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self._addPendingOperationIfPossible(method: method, instance: instance, actionOption: actionOption) |
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} |
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fileprivate func _addPendingOperationIfPossible(method: StorageMethod, instance: T, shouldBeSynchronized: Bool) { |
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self.pendingOperationManager?.addPendingOperation(method: method, instance: instance, shouldBeSynchronized: shouldBeSynchronized) |
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fileprivate func _addPendingOperationIfPossible(method: StorageMethod, instance: T, actionOption: ActionOption) { |
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self.pendingOperationManager?.addPendingOperation(method: method, instance: instance, actionOption: actionOption) |
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} |
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fileprivate func _mergePendingOperations() { |
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@ -381,18 +457,16 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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Logger.log(">>> Merge pending: \(manager.items.count)") |
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for item in manager.items { |
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let data = item.data |
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switch (item.method, item.shouldBeSynchronized) { |
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case (.addOrUpdate, true): |
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switch item.method { |
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case .add, .update: |
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self.addOrUpdate(instance: data) |
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case (.addOrUpdate, false): |
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self.addOrUpdateItem(instance: data) |
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case (.delete, true): |
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self.delete(instance: data) |
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case (.delete, false): |
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self.deleteItem(data) |
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case (.deleteUnusedShared, _): |
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self.deleteUnusedShared(data) |
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case .delete: |
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self.deleteItem(data, actionOption: item.actionOption) |
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case .deleteUnusedShared: |
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self.deleteUnusedShared(data, actionOption: item.actionOption) |
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} |
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self._delegate?.itemMerged(item) |
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} |
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self.pendingOperationManager = nil |
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@ -402,10 +476,7 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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/// Schedules a write operation |
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fileprivate func _scheduleWrite() { |
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guard !self.inMemory else { return } |
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DispatchQueue(label: "lestorage.queue.write", qos: .utility).asyncAndWait { // sync to make sure we don't have writes performed at the same time |
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DispatchQueue(label: "lestorage.queue.write", qos: .utility).asyncAndWait { |
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self._write() |
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} |
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} |
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@ -431,7 +502,6 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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public func reset() { |
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self.items.removeAll() |
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self.store.removeFile(type: T.self) |
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triggerWrite() |
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} |
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public var type: any Storable.Type { return T.self } |
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@ -451,38 +521,23 @@ public class BaseCollection<T: Storable>: SomeCollection, CollectionHolder { |
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} |
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} |
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} |
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public class StoredCollection<T: Storable>: BaseCollection<T>, RandomAccessCollection { |
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// MARK: - for Synced Collection |
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|
/// Returns a dummy StoredCollection instance |
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|
public static func placeholder() -> StoredCollection<T> { |
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|
return StoredCollection<T>(store: Store(storeCenter: StoreCenter.main)) |
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} |
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|
// MARK: - RandomAccessCollection |
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|
public var startIndex: Int { return self.items.startIndex } |
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|
public var endIndex: Int { return self.items.endIndex } |
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|
public func index(after i: Int) -> Int { |
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|
return self.items.index(after: i) |
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|
} |
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|
open subscript(index: Int) -> T { |
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|
get { |
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|
return self.items[index] |
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|
} |
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|
set(newValue) { |
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|
|
self.items[index] = newValue |
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|
|
self._triggerWrite = true |
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|
@MainActor |
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|
|
func updateLocalInstance(_ serverInstance: T) { |
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|
|
if let localInstance = self.findById(serverInstance.id) { |
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|
|
localInstance.copy(from: serverInstance) |
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|
|
self.requestWrite() |
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|
} |
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|
} |
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|
|
} |
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|
|
extension SyncedCollection: RandomAccessCollection { |
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|
|
extension StoredCollection: RandomAccessCollection { |
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|
|
public static func placeholder() -> StoredCollection<T> { |
|
|
|
|
return StoredCollection<T>(store: Store(storeCenter: StoreCenter.main)) |
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
public var startIndex: Int { return self.items.startIndex } |
|
|
|
|
|
|
|
|
|
@ -501,4 +556,5 @@ extension SyncedCollection: RandomAccessCollection { |
|
|
|
|
self._triggerWrite = true |
|
|
|
|
} |
|
|
|
|
} |
|
|
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|
|
|
|
} |
