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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| // | ||
| // EntityObserver.swift | ||
| // AlecrimCoreData | ||
| // | ||
| // Created by Vanderlei Martinelli on 07/06/18. | ||
| // Copyright © 2018 Alecrim. All rights reserved. | ||
| // | ||
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| import Foundation | ||
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| // MARK: - | ||
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| /// A fetch request controller wrapper for one entity only. Can be used as observer for an entity detail presentation, for example. | ||
| public final class EntityObserver<EntityType: ManagedObject> { | ||
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| private let frc: FetchRequestController<EntityType> | ||
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| fileprivate init(entity: EntityType, propertyName: String, updateHandler didChangeContentClosure: @escaping () -> Void, context: ManagedObjectContext) { | ||
| self.frc = Query<EntityType>(in: context) | ||
| .batchSize(0) | ||
| .filtered(using: Predicate(format: "SELF == %@", argumentArray: [entity])) | ||
| .sorted(by: SortDescriptor(key: propertyName, ascending: true)) | ||
| .toFetchRequestController() | ||
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| self.frc.didChangeContent(closure: didChangeContentClosure) | ||
| } | ||
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| deinit { | ||
| self.frc.removeAllBindings() | ||
| } | ||
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| } | ||
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| // MARK: - | ||
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| extension PersistentContainerType { | ||
| public func observer<EntityType: ManagedObject>(for entity: EntityType, updateHandler: @escaping () -> Void) -> EntityObserver<EntityType> { | ||
| // using any property here is fine, but there must be at least one property | ||
| guard let propertyName = entity.entity.properties.first(where: { $0.isTransient == false })?.name else { | ||
| fatalError("No property found.") | ||
| } | ||
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| return EntityObserver(entity: entity, propertyName: propertyName, updateHandler: updateHandler, context: self.viewContext) | ||
| } | ||
| } |
133 changes: 133 additions & 0 deletions
133
Source/AlecrimCoreData/Convenience/ManagedObjectContextType.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| // | ||
| // ManagedObjectContextType.swift | ||
| // AlecrimCoreData | ||
| // | ||
| // Created by Vanderlei Martinelli on 07/06/18. | ||
| // Copyright © 2018 Alecrim. All rights reserved. | ||
| // | ||
|
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| import Foundation | ||
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| // MARK: - | ||
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| extension ManagedObjectContext: ManagedObjectContextType {} | ||
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| // MARK: - | ||
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| public protocol ManagedObjectContextType { | ||
| func perform(_ block: @escaping () -> Void) | ||
| func performAndWait(_ block: () -> Void) | ||
| } | ||
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| // MARK: - | ||
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| extension ManagedObjectContextType { | ||
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| public func async<Value>(execute closure: @escaping (Self) throws -> Value, completion: @escaping ((Value?, Error?) -> Void)) { | ||
| let context = self | ||
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| context.perform { | ||
| do { | ||
| let value = try closure(context) | ||
| completion(value, nil) | ||
| } | ||
| catch { | ||
| completion(nil, error) | ||
| } | ||
| } | ||
| } | ||
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| public func async<Value>(execute closure: @escaping (Self) -> Value, completion: ((Value) -> Void)? = nil) { | ||
| let context = self | ||
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| context.perform { | ||
| let value = closure(context) | ||
| completion?(value) | ||
| } | ||
| } | ||
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| @discardableResult | ||
| public func sync<Value>(execute closure: (Self) throws -> Value) throws -> Value { | ||
| var value: Value? | ||
| var outError: Error? | ||
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| let context = self | ||
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| context.performAndWait { | ||
| do { | ||
| value = try closure(context) | ||
| } | ||
| catch { | ||
| outError = error | ||
| } | ||
| } | ||
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| if let outError = outError { | ||
| throw outError | ||
| } | ||
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| return value! | ||
| } | ||
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| @discardableResult | ||
| public func sync<Value>(execute closure: (Self) -> Value) -> Value { | ||
| var value: Value? | ||
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| let context = self | ||
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| context.performAndWait { | ||
| value = closure(context) | ||
| } | ||
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| return value! | ||
| } | ||
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| } | ||
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| // MARK: - | ||
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| extension PersistentContainer { | ||
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| public func async<Value>(execute closure: @escaping (ManagedObjectContext) throws -> Value, completion: @escaping ((Value?, Error?) -> Void)) { | ||
| return self.backgroundContext.async(execute: closure, completion: completion) | ||
| } | ||
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| public func async<Value>(execute closure: @escaping (ManagedObjectContext) -> Value, completion: ((Value) -> Void)? = nil) { | ||
| return self.backgroundContext.async(execute: closure, completion: completion) | ||
| } | ||
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| @discardableResult | ||
| public func sync<Value>(execute closure: (ManagedObjectContext) throws -> Value) throws -> Value { | ||
| return try self.backgroundContext.sync(execute: closure) | ||
| } | ||
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| @discardableResult | ||
| public func sync<Value>(execute closure: (ManagedObjectContext) -> Value) -> Value { | ||
| return self.backgroundContext.sync(execute: closure) | ||
| } | ||
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| } | ||
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| // MARK: - | ||
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| extension CustomPersistentContainer { | ||
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| public func async<Value>(execute closure: @escaping (Context) throws -> Value, completion: @escaping ((Value?, Error?) -> Void)) { | ||
| return self.backgroundContext.async(execute: closure, completion: completion) | ||
| } | ||
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| public func async<Value>(execute closure: @escaping (Context) -> Value, completion: ((Value) -> Void)? = nil) { | ||
| return self.backgroundContext.async(execute: closure, completion: completion) | ||
| } | ||
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| @discardableResult | ||
| public func sync<Value>(execute closure: (Context) throws -> Value) throws -> Value { | ||
| return try self.backgroundContext.sync(execute: closure) | ||
| } | ||
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| @discardableResult | ||
| public func sync<Value>(execute closure: (Context) -> Value) -> Value { | ||
| return self.backgroundContext.sync(execute: closure) | ||
| } | ||
|
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| } |
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