Renaming project because of cocoapods name clash with HardcoreData :(

CoreStore/Saving and Processing/AsynchronousDataTransaction.swift

@@ -0,0 +1,180 @@
+//
+//  AsynchronousDataTransaction.swift
+//  CoreStore
+//
+//  Copyright (c) 2015 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
+import GCDKit
+
+
+// MARK: - AsynchronousDataTransaction
+
+/**
+The `AsynchronousDataTransaction` provides an interface for `NSManagedObject` creates, updates, and deletes. A transaction object should typically be only used from within a transaction block initiated from `DataStack.beginAsynchronous(_:)`, or from `CoreStore.beginAsynchronous(_:)`.
+*/
+public final class AsynchronousDataTransaction: BaseDataTransaction {
+    
+    // MARK: Public
+    
+    /**
+    Saves the transaction changes asynchronously. This method should not be used after the `commit()` method was already called once.
+    
+    :param: completion the block executed after the save completes. Success or failure is reported by the `SaveResult` argument of the block.
+    */
+    public func commit(completion: (result: SaveResult) -> Void) {
+        
+        CoreStore.assert(self.transactionQueue.isCurrentExecutionContext(), "Attempted to commit a \(typeName(self)) outside its designated queue.")
+        CoreStore.assert(!self.isCommitted, "Attempted to commit a \(typeName(self)) more than once.")
+        
+        self.isCommitted = true
+        let semaphore = GCDSemaphore(0)
+        self.context.saveAsynchronouslyWithCompletion { (result) -> Void in
+            
+            self.result = result
+            completion(result: result)
+            semaphore.signal()
+        }
+        semaphore.wait()
+    }
+    
+    /**
+    Saves the transaction changes and waits for completion synchronously. This method should not be used after the `commit()` method was already called once.
+    */
+    public func commit() {
+        
+        CoreStore.assert(self.transactionQueue.isCurrentExecutionContext(), "Attempted to commit a \(typeName(self)) outside its designated queue.")
+        CoreStore.assert(!self.isCommitted, "Attempted to commit a \(typeName(self)) more than once.")
+        
+        self.isCommitted = true
+        self.result = self.context.saveSynchronously()
+    }
+    
+    /**
+    Begins a child transaction synchronously where NSManagedObject creates, updates, and deletes can be made. This method should not be used after the `commit()` method was already called once.
+    
+    :param: closure the block where creates, updates, and deletes can be made to the transaction. Transaction blocks are executed serially in a background queue, and all changes are made from a concurrent `NSManagedObjectContext`.
+    :returns: a `SaveResult` value indicating success or failure, or `nil` if the transaction was not comitted synchronously
+    */
+    public func beginSynchronous(closure: (transaction: SynchronousDataTransaction) -> Void) -> SaveResult? {
+        
+        CoreStore.assert(self.transactionQueue.isCurrentExecutionContext(), "Attempted to begin a child transaction from a \(typeName(self)) outside its designated queue.")
+        CoreStore.assert(!self.isCommitted, "Attempted to begin a child transaction from an already committed \(typeName(self)).")
+        
+        return SynchronousDataTransaction(
+            mainContext: self.context,
+            queue: self.childTransactionQueue,
+            closure: closure).performAndWait()
+    }
+    
+    
+    // MARK: BaseDataTransaction
+    
+    /**
+    Creates a new `NSManagedObject` with the specified entity type.
+    
+    :param: into the `Into` clause indicating the destination `NSManagedObject` entity type and the destination configuration
+    :returns: a new `NSManagedObject` instance of the specified entity type.
+    */
+    public override func create<T: NSManagedObject>(into: Into<T>) -> T {
+        
+        CoreStore.assert(!self.isCommitted, "Attempted to create an entity of type <\(T.self)> from an already committed \(typeName(self)).")
+        
+        return super.create(into)
+    }
+    
+    /**
+    Returns an editable proxy of a specified `NSManagedObject`. This method should not be used after the `commit()` method was already called once.
+    
+    :param: object the `NSManagedObject` type to be edited
+    :returns: an editable proxy for the specified `NSManagedObject`.
+    */
+    public override func fetch<T: NSManagedObject>(object: T?) -> T? {
+        
+        CoreStore.assert(!self.isCommitted, "Attempted to update an entity of type \(typeName(object)) from an already committed \(typeName(self)).")
+        
+        return super.fetch(object)
+    }
+    
+    /**
+    Deletes a specified `NSManagedObject`. This method should not be used after the `commit()` method was already called once.
+    
+    :param: object the `NSManagedObject` type to be deleted
+    */
+    public override func delete(object: NSManagedObject?) {
+        
+        CoreStore.assert(!self.isCommitted, "Attempted to delete an entity of type \(typeName(object)) from an already committed \(typeName(self)).")
+        
+        super.delete(object)
+    }
+    
+    /**
+    Rolls back the transaction by resetting the `NSManagedObjectContext`. After calling this method, all `NSManagedObjects` fetched within the transaction will become invalid. This method should not be used after the `commit()` method was already called once.
+    */
+    public override func rollback() {
+        
+        CoreStore.assert(!self.isCommitted, "Attempted to rollback an already committed \(typeName(self)).")
+        
+        super.rollback()
+    }
+    
+    
+    // MARK: Internal
+    
+    internal init(mainContext: NSManagedObjectContext, queue: GCDQueue, closure: (transaction: AsynchronousDataTransaction) -> Void) {
+        
+        self.closure = closure
+        
+        super.init(mainContext: mainContext, queue: queue)
+    }
+    
+    internal func perform() {
+        
+        self.transactionQueue.async {
+            
+            self.closure(transaction: self)
+            if !self.isCommitted && self.hasChanges {
+                
+                CoreStore.log(.Warning, message: "The closure for the \(typeName(self)) completed without being committed. All changes made within the transaction were discarded.")
+            }
+        }
+    }
+    
+    internal func performAndWait() -> SaveResult? {
+        
+        self.transactionQueue.sync {
+            
+            self.closure(transaction: self)
+            if !self.isCommitted && self.hasChanges {
+                
+                CoreStore.log(.Warning, message: "The closure for the \(typeName(self)) completed without being committed. All changes made within the transaction were discarded.")
+            }
+        }
+        return self.result
+    }
+    
+    
+    // MARK: Private
+    
+    private let closure: (transaction: AsynchronousDataTransaction) -> Void
+}

CoreStore/Saving and Processing/BaseDataTransaction.swift

@@ -0,0 +1,237 @@
+//
+//  BaseDataTransaction.swift
+//  CoreStore
+//
+//  Copyright (c) 2014 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
+import GCDKit
+
+
+// MARK: - Into
+
+/**
+A `Into` clause contains the destination entity and destination persistent store for a `create(...)` method. A common usage is to just indicate the entity:
+
+    let person = transaction.create(Into(MyPersonEntity))
+
+For cases where multiple `NSPersistentStore`'s contain the same entity, the destination configuration's name needs to be specified as well:
+
+    let person = transaction.create(Into<MyPersonEntity>("Configuration1"))
+
+This helps the `NSManagedObjectContext` to determine which
+*/
+public struct Into<T: NSManagedObject> {
+    
+    // MARK: Public
+    
+    /**
+    Initializes an `Into` clause.
+    Sample Usage:
+    
+        let person = transaction.create(Into<MyPersonEntity>())
+    */
+    public init(){
+        
+        self.configuration = nil
+        self.inferStoreIfPossible = true
+    }
+    
+    /**
+    Initializes an `Into` clause with the specified entity type.
+    Sample Usage:
+    
+        let person = transaction.create(Into(MyPersonEntity))
+    
+    :param: entity the `NSManagedObject` type to be created
+    */
+    public init(_ entity: T.Type) {
+        
+        self.configuration = nil
+        self.inferStoreIfPossible = true
+    }
+    
+    /**
+    Initializes an `Into` clause with the specified configuration.
+    Sample Usage:
+    
+        let person = transaction.create(Into<MyPersonEntity>("Configuration1"))
+    
+    :param: configuration the `NSPersistentStore` configuration name to associate the object to. This parameter is required if multiple configurations contain the created `NSManagedObject`'s entity type. Set to `nil` to use the default configuration.
+    */
+    public init(_ configuration: String?) {
+        
+        self.configuration = configuration
+        self.inferStoreIfPossible = false
+    }
+    
+    /**
+    Initializes an `Into` clause with the specified entity type and configuration.
+    Sample Usage:
+    
+        let person = transaction.create(Into(MyPersonEntity.self, "Configuration1"))
+    
+    :param: entity the `NSManagedObject` type to be created
+    :param: configuration the `NSPersistentStore` configuration name to associate the object to. This parameter is required if multiple configurations contain the created `NSManagedObject`'s entity type. Set to `nil` to use the default configuration.
+    */
+    public init(_ entity: T.Type, _ configuration: String?) {
+        
+        self.configuration = configuration
+        self.inferStoreIfPossible = false
+    }
+    
+    
+    // MARK: Internal
+    
+    internal let configuration: String?
+    internal let inferStoreIfPossible: Bool
+}
+
+
+// MARK: - BaseDataTransaction
+
+/**
+The `BaseDataTransaction` is an abstract interface for `NSManagedObject` creates, updates, and deletes. All `BaseDataTransaction` subclasses manage a private `NSManagedObjectContext` which are direct children of the `NSPersistentStoreCoordinator`'s root `NSManagedObjectContext`. This means that all updates are saved first to the persistent store, and then propagated up to the read-only `NSManagedObjectContext`.
+*/
+public /*abstract*/ class BaseDataTransaction {
+    
+    // MARK: Object management
+    
+    /**
+    Indicates if the transaction has pending changes
+    */
+    public var hasChanges: Bool {
+        
+        return self.context.hasChanges
+    }
+    
+    /**
+    Creates a new `NSManagedObject` with the specified entity type.
+    
+    :param: into the `Into` clause indicating the destination `NSManagedObject` entity type and the destination configuration
+    :returns: a new `NSManagedObject` instance of the specified entity type.
+    */
+    public func create<T: NSManagedObject>(into: Into<T>) -> T {
+        
+        CoreStore.assert(self.transactionQueue.isCurrentExecutionContext(), "Attempted to create an entity of type <\(T.self)> outside its designated queue.")
+        
+        let context = self.context
+        let object = T.createInContext(context)
+        
+        if into.inferStoreIfPossible {
+            
+            switch context.parentStack!.persistentStoreForEntityClass(T.self, configuration: nil, inferStoreIfPossible: true) {
+                
+            case (.Some(let persistentStore), _):
+                context.assignObject(object, toPersistentStore: persistentStore)
+                
+            case (.None, true):
+                CoreStore.assert(false, "Attempted to create an entity of type \(typeName(object)) with ambiguous destination persistent store, but the configuration name was not specified.")
+                
+            default:
+                CoreStore.assert(false, "Attempted to create an entity of type \(typeName(object)), but a destination persistent store containing the entity type could not be found.")
+            }
+        }
+        else {
+            
+            switch context.parentStack!.persistentStoreForEntityClass(T.self, configuration: into.configuration, inferStoreIfPossible: false) {
+                
+            case (.Some(let persistentStore), _):
+                context.assignObject(object, toPersistentStore: persistentStore)
+                
+            default:
+                if let configuration = into.configuration {
+                    
+                    CoreStore.assert(false, "Attempted to create an entity of type \(typeName(object)) into the configuration \"\(configuration)\", which it doesn't belong to.")
+                }
+                else {
+                    
+                    CoreStore.assert(false, "Attempted to create an entity of type \(typeName(object)) into the default configuration, which it doesn't belong to.")
+                }
+            }
+        }
+        
+        return object
+    }
+    
+    /**
+    Returns an editable proxy of a specified `NSManagedObject`.
+    
+    :param: object the `NSManagedObject` type to be edited
+    :returns: an editable proxy for the specified `NSManagedObject`.
+    */
+    public func fetch<T: NSManagedObject>(object: T?) -> T? {
+        
+        CoreStore.assert(self.transactionQueue.isCurrentExecutionContext(), "Attempted to update an entity of type \(typeName(object)) outside its designated queue.")
+        
+        return object?.inContext(self.context)
+    }
+    
+    /**
+    Deletes a specified `NSManagedObject`.
+    
+    :param: object the `NSManagedObject` type to be deleted
+    */
+    public func delete(object: NSManagedObject?) {
+        
+        CoreStore.assert(self.transactionQueue.isCurrentExecutionContext(), "Attempted to delete an entity of type \(typeName(object)) outside its designated queue.")
+        
+        object?.inContext(self.context)?.deleteFromContext()
+    }
+    
+    // MARK: Saving changes
+    
+    /**
+    Rolls back the transaction by resetting the `NSManagedObjectContext`. After calling this method, all `NSManagedObjects` fetched within the transaction will become invalid.
+    */
+    public func rollback() {
+        
+        CoreStore.assert(self.transactionQueue.isCurrentExecutionContext(), "Attempted to rollback a \(typeName(self)) outside its designated queue.")
+        
+        self.context.reset()
+    }
+    
+    
+    // MARK: Internal
+    
+    internal let context: NSManagedObjectContext
+    internal let transactionQueue: GCDQueue
+    internal let childTransactionQueue: GCDQueue = .createSerial("com.corestore.datastack.childtransactionqueue")
+    
+    internal var isCommitted = false
+    internal var result: SaveResult?
+    
+    internal init(mainContext: NSManagedObjectContext, queue: GCDQueue) {
+        
+        self.transactionQueue = queue
+        
+        let context = mainContext.temporaryContextInTransactionWithConcurrencyType(
+            queue == .Main
+                ? .MainQueueConcurrencyType
+                : .PrivateQueueConcurrencyType
+        )
+        self.context = context
+        
+        context.parentTransaction = self
+    }
+}

CoreStore/Saving and Processing/CoreStore+Transaction.swift

@@ -0,0 +1,65 @@
+//
+//  CoreStore+Transaction.swift
+//  CoreStore
+//
+//  Copyright (c) 2015 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
+
+
+// MARK: - CoreStore
+
+public extension CoreStore {
+    
+    // MARK: Public
+    
+    /**
+    Using the `defaultStack`, begins a transaction asynchronously where `NSManagedObject` creates, updates, and deletes can be made.
+    
+    :param: closure the block where creates, updates, and deletes can be made to the transaction. Transaction blocks are executed serially in a background queue, and all changes are made from a concurrent `NSManagedObjectContext`.
+    */
+    public static func beginAsynchronous(closure: (transaction: AsynchronousDataTransaction) -> Void) {
+        
+        self.defaultStack.beginAsynchronous(closure)
+    }
+    
+    /**
+    Using the `defaultStack`, begins a transaction asynchronously where `NSManagedObject` creates, updates, and deletes can be made.
+    
+    :param: closure the block where creates, updates, and deletes can be made to the transaction. Transaction blocks are executed serially in a background queue, and all changes are made from a concurrent `NSManagedObjectContext`.
+    :returns: a `SaveResult` value indicating success or failure, or `nil` if the transaction was not comitted synchronously
+    */
+    public static func beginSynchronous(closure: (transaction: SynchronousDataTransaction) -> Void) -> SaveResult? {
+        
+        return self.defaultStack.beginSynchronous(closure)
+    }
+    
+    /**
+    Using the `defaultStack`, begins a non-contiguous transaction where `NSManagedObject` creates, updates, and deletes can be made. This is useful for making temporary changes, such as partially filled forms. A detached transaction object should typically be only used from the main queue.
+    
+    :returns: a `DetachedDataTransaction` instance where creates, updates, and deletes can be made.
+    */
+    public static func beginDetached() -> DetachedDataTransaction {
+        
+        return self.defaultStack.beginDetached()
+    }
+}

CoreStore/Saving and Processing/DataStack+Transaction.swift

@@ -0,0 +1,81 @@
+//
+//  DataStack+Transaction.swift
+//  CoreStore
+//
+//  Copyright (c) 2015 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
+import GCDKit
+
+
+// MARK: - DataStack
+
+public extension DataStack {
+    
+    // MARK: Public
+    
+    /**
+    Begins a transaction asynchronously where `NSManagedObject` creates, updates, and deletes can be made.
+    
+    :param: closure the block where creates, updates, and deletes can be made to the transaction. Transaction blocks are executed serially in a background queue, and all changes are made from a concurrent `NSManagedObjectContext`.
+    */
+    public func beginAsynchronous(closure: (transaction: AsynchronousDataTransaction) -> Void) {
+        
+        CoreStore.assert(NSThread.isMainThread(), "Attempted to begin a transaction from a \(typeName(self)) outside the main thread.")
+        
+        AsynchronousDataTransaction(
+            mainContext: self.rootSavingContext,
+            queue: self.childTransactionQueue,
+            closure: closure).perform()
+    }
+    
+    /**
+    Begins a transaction synchronously where `NSManagedObject` creates, updates, and deletes can be made.
+    
+    :param: closure the block where creates, updates, and deletes can be made to the transaction. Transaction blocks are executed serially in a background queue, and all changes are made from a concurrent `NSManagedObjectContext`.
+    :returns: a `SaveResult` value indicating success or failure, or `nil` if the transaction was not comitted synchronously
+    */
+    public func beginSynchronous(closure: (transaction: SynchronousDataTransaction) -> Void) -> SaveResult? {
+        
+        CoreStore.assert(NSThread.isMainThread(), "Attempted to begin a transaction from a \(typeName(self)) outside the main thread.")
+        
+        return SynchronousDataTransaction(
+            mainContext: self.rootSavingContext,
+            queue: self.childTransactionQueue,
+            closure: closure).performAndWait()
+    }
+    
+    /**
+    Begins a non-contiguous transaction where `NSManagedObject` creates, updates, and deletes can be made. This is useful for making temporary changes, such as partially filled forms. A detached transaction object should typically be only used from the main queue.
+    
+    :returns: a `DetachedDataTransaction` instance where creates, updates, and deletes can be made.
+    */
+    public func beginDetached() -> DetachedDataTransaction {
+        
+        CoreStore.assert(NSThread.isMainThread(), "Attempted to begin a transaction from a \(typeName(self)) outside the main thread.")
+        
+        return DetachedDataTransaction(
+            mainContext: self.rootSavingContext,
+            queue: .Main)
+    }
+}

CoreStore/Saving and Processing/DetachedDataTransaction.swift

@@ -0,0 +1,55 @@
+//
+//  DetachedDataTransaction.swift
+//  CoreStore
+//
+//  Copyright (c) 2015 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 GCDKit
+
+
+// MARK: - DetachedDataTransaction
+
+/**
+The `DetachedDataTransaction` provides an interface for non-contiguous `NSManagedObject` creates, updates, and deletes. This is useful for making temporary changes, such as partially filled forms. A detached transaction object should typically be only used from the main queue.
+*/
+public final class DetachedDataTransaction: BaseDataTransaction {
+    
+    // MARK: Public
+    
+    /**
+    Saves the transaction changes asynchronously. For a `DetachedDataTransaction`, multiple commits are allowed, although it is the developer's responsibility to ensure a reasonable leeway to prevent blocking the main thread.
+    
+    :param: completion the block executed after the save completes. Success or failure is reported by the `SaveResult` argument of the block.
+    */
+    public func commit(completion: (result: SaveResult) -> Void) {
+        
+        CoreStore.assert(self.transactionQueue.isCurrentExecutionContext(), "Attempted to commit a \(typeName(self)) outside its designated queue.")
+        
+        self.context.saveAsynchronouslyWithCompletion { (result) -> Void in
+            
+            self.result = result
+            completion(result: result)
+        }
+    }
+}
+

CoreStore/Saving and Processing/SaveResult.swift

@@ -0,0 +1,112 @@
+//
+//  SaveResult.swift
+//  CoreStore
+//
+//  Copyright (c) 2014 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
+
+
+// MARK: - SaveResult
+
+/**
+The `SaveResult` indicates the result of a `commit(...)` for a transaction.
+The `SaveResult` can be treated as a boolean:
+
+    CoreStore.beginAsynchronous { transaction in
+        // ...
+        let result = transaction.commit()
+        if result {
+            // succeeded
+        }
+        else {
+            // failed
+        }
+    }
+
+or as an `enum`, where the resulting associated object can also be inspected:
+
+    CoreStore.beginAsynchronous { transaction in
+        // ...
+        let result = transaction.commit()
+        switch result {
+        case .Success(let hasChanges):
+            // hasChanges indicates if there were changes or not
+        case .Failure(let error):
+            // error is the NSError instance for the failure
+        }
+    }
+```
+*/
+public enum SaveResult {
+    
+    // MARK: Public
+    
+    /**
+    `SaveResult.Success` indicates that the `commit()` for the transaction succeeded, either because the save succeeded or because there were no changes to save. The associated value `hasChanges` indicates if there were saved changes or not.
+    */
+    case Success(hasChanges: Bool)
+    
+    /**
+    `SaveResult.Failure` indicates that the `commit()` for the transaction failed. The associated object for this value is the related `NSError` instance.
+    */
+    case Failure(NSError)
+    
+    
+    // MARK: Internal
+    
+    internal init(hasChanges: Bool) {
+        
+        self = .Success(hasChanges: hasChanges)
+    }
+    
+    internal init(_ error: NSError) {
+        
+        self = .Failure(error)
+    }
+    
+    internal init(_ errorCode: CoreStoreErrorCode) {
+        
+        self.init(errorCode, userInfo: nil)
+    }
+    
+    internal init(_ errorCode: CoreStoreErrorCode, userInfo: [NSObject: AnyObject]?) {
+        
+        self.init(NSError(
+            coreStoreErrorCode: errorCode,
+            userInfo: userInfo))
+    }
+}
+
+
+// MARK: - SaveResult: BooleanType
+
+extension SaveResult: BooleanType {
+    
+    public var boolValue: Bool {
+        
+        switch self {
+        case .Success: return true
+        case .Failure: return false
+        }
+    }
+}

CoreStore/Saving and Processing/SynchronousDataTransaction.swift

@@ -0,0 +1,147 @@
+//
+//  SynchronousDataTransaction.swift
+//  CoreStore
+//
+//  Copyright (c) 2015 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
+import GCDKit
+
+
+// MARK: - SynchronousDataTransaction
+
+/**
+The `SynchronousDataTransaction` provides an interface for `NSManagedObject` 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 {
+    
+    // MARK: Public
+    
+    /**
+    Saves the transaction changes and waits for completion synchronously. This method should not be used after the `commit()` method was already called once.
+    */
+    public func commit() {
+        
+        CoreStore.assert(self.transactionQueue.isCurrentExecutionContext(), "Attempted to commit a \(typeName(self)) outside its designated queue.")
+        CoreStore.assert(!self.isCommitted, "Attempted to commit a \(typeName(self)) more than once.")
+        
+        self.isCommitted = true
+        self.result = self.context.saveSynchronously()
+    }
+    
+    /**
+    Begins a child transaction synchronously where `NSManagedObject` creates, updates, and deletes can be made. This method should not be used after the `commit()` method was already called once.
+    
+    :param: closure the block where creates, updates, and deletes can be made to the transaction. Transaction blocks are executed serially in a background queue, and all changes are made from a concurrent `NSManagedObjectContext`.
+    :returns: a `SaveResult` value indicating success or failure, or `nil` if the transaction was not comitted synchronously
+    */
+    public func beginSynchronous(closure: (transaction: SynchronousDataTransaction) -> Void) -> SaveResult? {
+        
+        CoreStore.assert(self.transactionQueue.isCurrentExecutionContext(), "Attempted to begin a child transaction from a \(typeName(self)) outside its designated queue.")
+        CoreStore.assert(!self.isCommitted, "Attempted to begin a child transaction from an already committed \(typeName(self)).")
+        
+        return SynchronousDataTransaction(
+            mainContext: self.context,
+            queue: self.childTransactionQueue,
+            closure: closure).performAndWait()
+    }
+    
+    
+    // MARK: BaseDataTransaction
+    
+    /**
+    Creates a new `NSManagedObject` with the specified entity type.
+    
+    :param: into the `Into` clause indicating the destination `NSManagedObject` entity type and the destination configuration
+    :returns: a new `NSManagedObject` instance of the specified entity type.
+    */
+    public override func create<T: NSManagedObject>(into: Into<T>) -> T {
+        
+        CoreStore.assert(!self.isCommitted, "Attempted to create an entity of type <\(T.self)> from an already committed \(typeName(self)).")
+        
+        return super.create(into)
+    }
+    
+    /**
+    Returns an editable proxy of a specified `NSManagedObject`. This method should not be used after the `commit()` method was already called once.
+    
+    :param: object the `NSManagedObject` type to be edited
+    :returns: an editable proxy for the specified `NSManagedObject`.
+    */
+    public override func fetch<T: NSManagedObject>(object: T?) -> T? {
+        
+        CoreStore.assert(!self.isCommitted, "Attempted to update an entity of type \(typeName(object)) from an already committed \(typeName(self)).")
+        
+        return super.fetch(object)
+    }
+    
+    /**
+    Deletes a specified `NSManagedObject`. This method should not be used after the `commit()` method was already called once.
+    
+    :param: object the `NSManagedObject` type to be deleted
+    */
+    public override func delete(object: NSManagedObject?) {
+        
+        CoreStore.assert(!self.isCommitted, "Attempted to delete an entity of type \(typeName(object)) from an already committed \(typeName(self)).")
+        
+        super.delete(object)
+    }
+    
+    /**
+    Rolls back the transaction by resetting the `NSManagedObjectContext`. After calling this method, all `NSManagedObjects` fetched within the transaction will become invalid. This method should not be used after the `commit()` method was already called once.
+    */
+    public override func rollback() {
+        
+        CoreStore.assert(!self.isCommitted, "Attempted to rollback an already committed \(typeName(self)).")
+        
+        super.rollback()
+    }
+    
+    
+    // MARK: Internal
+    
+    internal func performAndWait() -> SaveResult? {
+        
+        self.transactionQueue.sync {
+            
+            self.closure(transaction: self)
+            if !self.isCommitted && self.hasChanges {
+                
+                CoreStore.log(.Warning, message: "The closure for the \(typeName(self)) completed without being committed. All changes made within the transaction were discarded.")
+            }
+        }
+        return self.result
+    }
+    
+    internal init(mainContext: NSManagedObjectContext, queue: GCDQueue, closure: (transaction: SynchronousDataTransaction) -> Void) {
+        
+        self.closure = closure
+        
+        super.init(mainContext: mainContext, queue: queue)
+    }
+    
+    
+    // MARK: Private
+    
+    private let closure: (transaction: SynchronousDataTransaction) -> Void
+}