mirror of
https://github.com/JohnEstropia/CoreStore.git
synced 2026-01-12 04:10:36 +01:00
243 lines
9.2 KiB
Swift
243 lines
9.2 KiB
Swift
//
|
|
// SynchronousDataTransaction.swift
|
|
// CoreStore
|
|
//
|
|
// Copyright © 2018 John Rommel Estropia
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in all
|
|
// copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
// SOFTWARE.
|
|
//
|
|
|
|
import Foundation
|
|
import CoreData
|
|
|
|
|
|
// MARK: - SynchronousDataTransaction
|
|
|
|
/**
|
|
The `SynchronousDataTransaction` provides an interface for `DynamicObject` creates, updates, and deletes. A transaction object should typically be only used from within a transaction block initiated from `DataStack.beginSynchronous(_:)`, or from `CoreStore.beginSynchronous(_:)`.
|
|
*/
|
|
public final class SynchronousDataTransaction: BaseDataTransaction {
|
|
|
|
/**
|
|
Cancels a transaction by throwing `CoreStoreError.userCancelled`.
|
|
```
|
|
try transaction.cancel()
|
|
```
|
|
- Important: Always use plain `try` on a `cancel()` call. Never use `try?` or `try!`. Using `try?` will swallow the cancellation and the transaction will proceed to commit as normal. Using `try!` will crash the app as `cancel()` will *always* throw an error.
|
|
*/
|
|
public func cancel() throws -> Never {
|
|
|
|
throw CoreStoreError.userCancelled
|
|
}
|
|
|
|
|
|
// MARK: BaseDataTransaction
|
|
|
|
/**
|
|
Creates a new `NSManagedObject` or `CoreStoreObject` with the specified entity type.
|
|
|
|
- parameter into: the `Into` clause indicating the destination `NSManagedObject` or `CoreStoreObject` entity type and the destination configuration
|
|
- returns: a new `NSManagedObject` or `CoreStoreObject` instance of the specified entity type.
|
|
*/
|
|
public override func create<D>(_ into: Into<D>) -> D {
|
|
|
|
CoreStore.assert(
|
|
!self.isCommitted,
|
|
"Attempted to create an entity of type \(cs_typeName(into.entityClass)) from an already committed \(cs_typeName(self))."
|
|
)
|
|
|
|
return super.create(into)
|
|
}
|
|
|
|
/**
|
|
Returns an editable proxy of a specified `NSManagedObject` or `CoreStoreObject`.
|
|
|
|
- parameter object: the `NSManagedObject` or `CoreStoreObject` to be edited
|
|
- returns: an editable proxy for the specified `NSManagedObject` or `CoreStoreObject`.
|
|
*/
|
|
public override func edit<D: DynamicObject>(_ object: D?) -> D? {
|
|
|
|
CoreStore.assert(
|
|
!self.isCommitted,
|
|
"Attempted to update an entity of type \(cs_typeName(object)) from an already committed \(cs_typeName(self))."
|
|
)
|
|
|
|
return super.edit(object)
|
|
}
|
|
|
|
/**
|
|
Returns an editable proxy of the object with the specified `NSManagedObjectID`.
|
|
|
|
- parameter into: an `Into` clause specifying the entity type
|
|
- parameter objectID: the `NSManagedObjectID` for the object to be edited
|
|
- returns: an editable proxy for the specified `NSManagedObject` or `CoreStoreObject`.
|
|
*/
|
|
public override func edit<D>(_ into: Into<D>, _ objectID: NSManagedObjectID) -> D? {
|
|
|
|
CoreStore.assert(
|
|
!self.isCommitted,
|
|
"Attempted to update an entity of type \(cs_typeName(into.entityClass)) from an already committed \(cs_typeName(self))."
|
|
)
|
|
|
|
return super.edit(into, objectID)
|
|
}
|
|
|
|
/**
|
|
Deletes a specified `NSManagedObject` or `CoreStoreObject`.
|
|
|
|
- parameter object: the `NSManagedObject` or `CoreStoreObject` type to be deleted
|
|
*/
|
|
public override func delete<D: DynamicObject>(_ object: D?) {
|
|
|
|
CoreStore.assert(
|
|
!self.isCommitted,
|
|
"Attempted to delete an entity of type \(cs_typeName(object)) from an already committed \(cs_typeName(self))."
|
|
)
|
|
|
|
super.delete(object)
|
|
}
|
|
|
|
/**
|
|
Deletes the specified `DynamicObject`s.
|
|
|
|
- parameter object1: the `DynamicObject` to be deleted
|
|
- parameter object2: another `DynamicObject` to be deleted
|
|
- parameter objects: other `DynamicObject`s to be deleted
|
|
*/
|
|
public override func delete<D: DynamicObject>(_ object1: D?, _ object2: D?, _ objects: D?...) {
|
|
|
|
CoreStore.assert(
|
|
!self.isCommitted,
|
|
"Attempted to delete an entities from an already committed \(cs_typeName(self))."
|
|
)
|
|
|
|
super.delete(([object1, object2] + objects).compactMap { $0 })
|
|
}
|
|
|
|
/**
|
|
Deletes the specified `DynamicObject`s.
|
|
|
|
- parameter objects: the `DynamicObject`s to be deleted
|
|
*/
|
|
public override func delete<S: Sequence>(_ objects: S) where S.Iterator.Element: DynamicObject {
|
|
|
|
CoreStore.assert(
|
|
!self.isCommitted,
|
|
"Attempted to delete an entities from an already committed \(cs_typeName(self))."
|
|
)
|
|
|
|
super.delete(objects)
|
|
}
|
|
|
|
|
|
// MARK: Internal
|
|
|
|
internal init(mainContext: NSManagedObjectContext, queue: DispatchQueue) {
|
|
|
|
super.init(mainContext: mainContext, queue: queue, supportsUndo: false, bypassesQueueing: false)
|
|
}
|
|
|
|
internal func autoCommit(waitForMerge: Bool) -> (hasChanges: Bool, error: CoreStoreError?) {
|
|
|
|
self.isCommitted = true
|
|
let result = self.context.saveSynchronously(waitForMerge: waitForMerge)
|
|
self.result = result
|
|
defer {
|
|
|
|
self.context.reset()
|
|
}
|
|
return result
|
|
}
|
|
|
|
|
|
// MARK: Deprecated
|
|
|
|
@available(*, deprecated, message: "Use the new auto-commit method DataStack.perform(synchronous:waitForAllObservers:)")
|
|
public func commitAndWait() -> SaveResult {
|
|
|
|
CoreStore.assert(
|
|
self.transactionQueue.cs_isCurrentExecutionContext(),
|
|
"Attempted to commit a \(cs_typeName(self)) outside its designated queue."
|
|
)
|
|
CoreStore.assert(
|
|
!self.isCommitted,
|
|
"Attempted to commit a \(cs_typeName(self)) more than once."
|
|
)
|
|
switch self.autoCommit(waitForMerge: true) {
|
|
|
|
case (let hasChanges, nil): return SaveResult(hasChanges: hasChanges)
|
|
case (_, let error?): return SaveResult(error)
|
|
}
|
|
}
|
|
|
|
@available(*, deprecated, message: "Use the new auto-commit method DataStack.perform(synchronous:waitForAllObservers:)")
|
|
public func commit() -> SaveResult {
|
|
|
|
CoreStore.assert(
|
|
self.transactionQueue.cs_isCurrentExecutionContext(),
|
|
"Attempted to commit a \(cs_typeName(self)) outside its designated queue."
|
|
)
|
|
CoreStore.assert(
|
|
!self.isCommitted,
|
|
"Attempted to commit a \(cs_typeName(self)) more than once."
|
|
)
|
|
switch self.autoCommit(waitForMerge: false) {
|
|
|
|
case (let hasChanges, nil): return SaveResult(hasChanges: hasChanges)
|
|
case (_, let error?): return SaveResult(error)
|
|
}
|
|
}
|
|
|
|
@available(*, deprecated, message: "Secondary tasks spawned from AsynchronousDataTransactions and SynchronousDataTransactions are no longer supported. ")
|
|
@discardableResult
|
|
public func beginSynchronous(_ closure: @escaping (_ transaction: SynchronousDataTransaction) -> Void) -> SaveResult? {
|
|
|
|
CoreStore.assert(
|
|
self.transactionQueue.cs_isCurrentExecutionContext(),
|
|
"Attempted to begin a child transaction from a \(cs_typeName(self)) outside its designated queue."
|
|
)
|
|
CoreStore.assert(
|
|
!self.isCommitted,
|
|
"Attempted to begin a child transaction from an already committed \(cs_typeName(self))."
|
|
)
|
|
let childTransaction = SynchronousDataTransaction(
|
|
mainContext: self.context,
|
|
queue: self.childTransactionQueue
|
|
)
|
|
childTransaction.transactionQueue.cs_sync {
|
|
|
|
closure(childTransaction)
|
|
|
|
if !childTransaction.isCommitted && childTransaction.hasChanges {
|
|
|
|
CoreStore.log(
|
|
.warning,
|
|
message: "The closure for the \(cs_typeName(childTransaction)) completed without being committed. All changes made within the transaction were discarded."
|
|
)
|
|
}
|
|
}
|
|
switch childTransaction.result {
|
|
|
|
case .none: return nil
|
|
case .some(let hasChanges, nil): return SaveResult(hasChanges: hasChanges)
|
|
case .some(_, let error?): return SaveResult(error)
|
|
}
|
|
}
|
|
}
|