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Code Issues 95 Packages Projects Releases 10 Wiki Activity

prototype for CoreStoreObject property observers (a.k.a. KVO)

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This commit is contained in:
John Estropia
2018-12-14 18:20:42 +09:00
parent 8409a13289
commit 10cd18dbf0
5 changed files with 613 additions and 0 deletions
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10
CoreStore.xcodeproj/project.pbxproj
View File

@@ -659,6 +659,10 @@
B5E84F371AFF85470064E85B /* NSManagedObjectContext+Transaction.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84F331AFF85470064E85B /* NSManagedObjectContext+Transaction.swift */; };
B5E84F391AFF85470064E85B /* NSManagedObjectContext+Querying.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84F351AFF85470064E85B /* NSManagedObjectContext+Querying.swift */; };
B5E84F411AFF8CCD0064E85B /* TypeErasedClauses.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E84F401AFF8CCD0064E85B /* TypeErasedClauses.swift */; };
B5E8A72021C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */; };
B5E8A72121C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */; };
B5E8A72221C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */; };
B5E8A72321C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */; };
B5ECDBDF1CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5ECDBDE1CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift */; };
B5ECDBE11CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5ECDBDE1CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift */; };
B5ECDBE21CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift in Sources */ = {isa = PBXBuildFile; fileRef = B5ECDBDE1CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift */; };
@@ -950,6 +954,7 @@
B5E84F331AFF85470064E85B /* NSManagedObjectContext+Transaction.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSManagedObjectContext+Transaction.swift"; sourceTree = "<group>"; };
B5E84F351AFF85470064E85B /* NSManagedObjectContext+Querying.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "NSManagedObjectContext+Querying.swift"; sourceTree = "<group>"; };
B5E84F401AFF8CCD0064E85B /* TypeErasedClauses.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TypeErasedClauses.swift; sourceTree = "<group>"; };
B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "CoreStoreObject+Observing.swift"; sourceTree = "<group>"; };
B5ECDBDE1CA6BB2B00C7F112 /* CSBaseDataTransaction+Querying.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "CSBaseDataTransaction+Querying.swift"; sourceTree = "<group>"; };
B5ECDBE41CA6BEA300C7F112 /* CSClauseTypes.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSClauseTypes.swift; sourceTree = "<group>"; };
B5ECDBEB1CA6BF2000C7F112 /* CSFrom.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CSFrom.swift; sourceTree = "<group>"; };
@@ -1493,6 +1498,7 @@
B56007131B3F6C2800A9A8F9 /* SectionBy.swift */,
B5E84F1A1AFF84860064E85B /* DataStack+Observing.swift */,
B5E84F1B1AFF84860064E85B /* CoreStore+Observing.swift */,
B5E8A71F21C1015300EF006A /* CoreStoreObject+Observing.swift */,
B5C976E21C6C9F6A00B1AF90 /* UnsafeDataTransaction+Observing.swift */,
B5E84F1C1AFF84860064E85B /* ObjectMonitor.swift */,
B5E84F1F1AFF84860064E85B /* ObjectObserver.swift */,
@@ -2008,6 +2014,7 @@
B5A991EC1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
B5FE4DA71C84FB4400FA6A91 /* InMemoryStore.swift in Sources */,
B52F743D1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
B5E8A72021C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
B56923FF1EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
B5215CAE1FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
B5ECDBEC1CA6BF2000C7F112 /* CSFrom.swift in Sources */,
@@ -2204,6 +2211,7 @@
B5A991ED1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
B5ECDBEE1CA6BF2000C7F112 /* CSFrom.swift in Sources */,
B52F743E1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
B5E8A72121C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
B56924001EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
B5215CAF1FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
82BA18D61C4BBD7100A0916E /* NSManagedObjectContext+Transaction.swift in Sources */,
@@ -2400,6 +2408,7 @@
B5A991EF1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
B5220E201D130813009BC71E /* CSObjectMonitor.swift in Sources */,
B52F74401E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
B5E8A72321C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
B56924021EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
B5215CB11FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
B5220E171D1306DF009BC71E /* UnsafeDataTransaction+Observing.swift in Sources */,
@@ -2596,6 +2605,7 @@
B5A991EE1E9DC2CE0091A2E3 /* VersionLock.swift in Sources */,
B5ECDBEF1CA6BF2000C7F112 /* CSFrom.swift in Sources */,
B52F743F1E9B8724005F3DAC /* DynamicSchema.swift in Sources */,
B5E8A72221C1015300EF006A /* CoreStoreObject+Observing.swift in Sources */,
B56924011EB82976007C4DC9 /* CSUnsafeDataModelSchema.swift in Sources */,
B5215CB01FA4812500139E3A /* SectionMonitorBuilder.swift in Sources */,
B56321B41BD6521C006C9394 /* NSManagedObjectContext+Transaction.swift in Sources */,

5
CoreStore.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings Normal file
View File

@@ -0,0 +1,5 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict/>
</plist>

55
CoreStoreDemo/CoreStoreDemo/Images.xcassets/AppIcon.appiconset/Contents.json
View File

@@ -1,5 +1,15 @@
{
"images" : [
{
"idiom" : "iphone",
"size" : "20x20",
"scale" : "2x"
},
{
"idiom" : "iphone",
"size" : "20x20",
"scale" : "3x"
},
{
"idiom" : "iphone",
"size" : "29x29",
@@ -32,6 +42,36 @@
"filename" : "Icon-60@3x-1.png",
"scale" : "3x"
},
{
"idiom" : "ipad",
"size" : "20x20",
"scale" : "1x"
},
{
"idiom" : "ipad",
"size" : "20x20",
"scale" : "2x"
},
{
"idiom" : "ipad",
"size" : "29x29",
"scale" : "1x"
},
{
"idiom" : "ipad",
"size" : "29x29",
"scale" : "2x"
},
{
"idiom" : "ipad",
"size" : "40x40",
"scale" : "1x"
},
{
"idiom" : "ipad",
"size" : "40x40",
"scale" : "2x"
},
{
"size" : "76x76",
"idiom" : "ipad",
@@ -44,6 +84,21 @@
"filename" : "Icon-76@2x.png",
"scale" : "2x"
},
{
"idiom" : "ipad",
"size" : "83.5x83.5",
"scale" : "2x"
},
{
"idiom" : "ios-marketing",
"size" : "1024x1024",
"scale" : "1x"
},
{
"idiom" : "car",
"size" : "60x60",
"scale" : "2x"
},
{
"size" : "60x60",
"idiom" : "car",

36
CoreStoreTests/DynamicModelTests.swift
View File

@@ -143,6 +143,9 @@ class DynamicModelTests: BaseTestDataTestCase {
let updateDone = self.expectation(description: "update-done")
let fetchDone = self.expectation(description: "fetch-done")
let willSetPriorObserverDone = self.expectation(description: "willSet-observe-prior-done")
let willSetNotPriorObserverDone = self.expectation(description: "willSet-observe-notPrior-done")
let didSetObserverDone = self.expectation(description: "didSet-observe-done")
stack.perform(
asynchronous: { (transaction) in
@@ -160,9 +163,42 @@ class DynamicModelTests: BaseTestDataTestCase {
XCTAssertEqual(dog.species.value, "Swift")
XCTAssertEqual(dog.nickname.value, nil)
XCTAssertEqual(dog.age.value, 1)
let didSetObserver = dog.species.observe(options: [.new, .old]) { (object, change) in
XCTAssertEqual(object, dog)
XCTAssertEqual(change.kind, .setting)
XCTAssertEqual(change.newValue, "Dog")
XCTAssertEqual(change.oldValue, "Swift")
XCTAssertFalse(change.isPrior)
XCTAssertEqual(object.species.value, "Dog")
didSetObserverDone.fulfill()
}
let willSetObserver = dog.species.observe(options: [.new, .old, .prior]) { (object, change) in
XCTAssertEqual(object, dog)
XCTAssertEqual(change.kind, .setting)
XCTAssertEqual(change.oldValue, "Swift")
if change.isPrior {
XCTAssertNil(change.newValue)
XCTAssertEqual(object.species.value, "Swift")
willSetPriorObserverDone.fulfill()
}
else {
XCTAssertEqual(change.newValue, "Dog")
XCTAssertEqual(object.species.value, "Dog")
willSetNotPriorObserverDone.fulfill()
}
}
dog.species .= "Dog"
XCTAssertEqual(dog.species.value, "Dog")
didSetObserver.invalidate()
willSetObserver.invalidate()
dog.nickname .= "Spot"
XCTAssertEqual(dog.nickname.value, "Spot")

507
Sources/CoreStoreObject+Observing.swift Normal file
View File

@@ -0,0 +1,507 @@
//
// CoreStoreObject+Observing.swift
// CoreStore
//
// Created by John Estropia on 2018/12/12.
// Copyright © 2018 John Rommel Estropia. All rights reserved.
//
import Foundation
import CoreData
// MARK: CoreStoreObjectKeyValueObservation
/**
Observation token for `CoreStoreObject` properties. Make sure to retain this instance to keep observing notifications.
`invalidate()` will be called automatically when an `CoreStoreObjectKeyValueObservation` is deinited.
*/
public protocol CoreStoreObjectKeyValueObservation: class {
/**
`invalidate()` will be called automatically when an `CoreStoreObjectKeyValueObservation` is deinited.
*/
func invalidate()
}
// MARK: - ValueContainer.Required
extension ValueContainer.Required {
public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectValueDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
return self.observe(with: options, changeHandler: changeHandler)
}
}
// MARK: - ValueContainer.Optional
extension ValueContainer.Optional {
public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectValueDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
return self.observe(with: options, changeHandler: changeHandler)
}
}
// MARK: - TransformableContainer.Required
extension TransformableContainer.Required {
public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectTransformableDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
return self.observe(with: options, changeHandler: changeHandler)
}
}
// MARK: - TransformableContainer.Optional
extension TransformableContainer.Optional {
public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectTransformableDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
return self.observe(with: options, changeHandler: changeHandler)
}
}
// MARK: - RelationshipContainer.ToOne
extension RelationshipContainer.ToOne {
public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectObjectDiff<D>) -> Void) -> CoreStoreObjectKeyValueObservation {
let result = _CoreStoreObjectKeyValueObservation(
object: self.rawObject!,
keyPath: self.keyPath,
callback: { (object, kind, newValue, oldValue, _, isPrior) in
let notification = CoreStoreObjectObjectDiff<D>(
kind: kind,
newNativeValue: newValue as! CoreStoreManagedObject?,
oldNativeValue: oldValue as! CoreStoreManagedObject?,
isPrior: isPrior
)
changeHandler(
O.cs_fromRaw(object: object),
notification
)
}
)
result.start(options)
return result
}
}
// MARK: - RelationshipContainer.ToManyUnordered
extension RelationshipContainer.ToManyUnordered {
public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectUnorderedDiff<D>) -> Void) -> CoreStoreObjectKeyValueObservation {
let result = _CoreStoreObjectKeyValueObservation(
object: self.rawObject!,
keyPath: self.keyPath,
callback: { (object, kind, newValue, oldValue, _, isPrior) in
let notification = CoreStoreObjectUnorderedDiff<D>(
kind: kind,
newNativeValue: newValue as! NSOrderedSet?,
oldNativeValue: oldValue as! NSOrderedSet?,
isPrior: isPrior
)
changeHandler(
O.cs_fromRaw(object: object),
notification
)
}
)
result.start(options)
return result
}
}
// MARK: - RelationshipContainer.ToManyOrdered
extension RelationshipContainer.ToManyOrdered {
public func observe(options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectOrderedDiff<D>) -> Void) -> CoreStoreObjectKeyValueObservation {
let result = _CoreStoreObjectKeyValueObservation(
object: self.rawObject!,
keyPath: self.keyPath,
callback: { (object, kind, newValue, oldValue, indexes, isPrior) in
let notification = CoreStoreObjectOrderedDiff<D>(
kind: kind,
newNativeValue: newValue as! NSArray?,
oldNativeValue: oldValue as! NSArray?,
indexes: indexes ?? IndexSet(),
isPrior: isPrior
)
changeHandler(
O.cs_fromRaw(object: object),
notification
)
}
)
result.start(options)
return result
}
}
// MARK: - CoreStoreObjectValueDiff
public final class CoreStoreObjectValueDiff<V: ImportableAttributeType> {
/**
Indicates the kind of change. See the comments for `NSObject.observeValue(forKeyPath:of:change:context:)` for more information.
*/
public let kind: NSKeyValueChange
/**
`newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
*/
public private(set) lazy var newValue: V? = self.newNativeValue.flatMap(V.cs_fromQueryableNativeType)
/**
`newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
*/
public private(set) lazy var oldValue: V? = self.oldNativeValue.flatMap(V.cs_fromQueryableNativeType)
/**
'isPrior' will be `true` if this change observation is being sent before the change happens, due to `.prior` being passed to `observe()`
*/
public let isPrior: Bool
// MARK: FilePrivate
fileprivate init(kind: NSKeyValueChange, newNativeValue: V.QueryableNativeType?, oldNativeValue: V.QueryableNativeType?, isPrior: Bool) {
self.kind = kind
self.newNativeValue = newNativeValue
self.oldNativeValue = oldNativeValue
self.isPrior = isPrior
}
// MARK: Private
private let newNativeValue: V.QueryableNativeType?
private let oldNativeValue: V.QueryableNativeType?
}
// MARK: - CoreStoreObjectValueDiff
public final class CoreStoreObjectTransformableDiff<V: NSCoding & NSCopying> {
/**
Indicates the kind of change. See the comments for `NSObject.observeValue(forKeyPath:of:change:context:)` for more information.
*/
public let kind: NSKeyValueChange
/**
`newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
*/
public let newValue: V?
/**
`newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
*/
public let oldValue: V?
/**
'isPrior' will be `true` if this change observation is being sent before the change happens, due to `.prior` being passed to `observe()`
*/
public let isPrior: Bool
// MARK: FilePrivate
fileprivate init(kind: NSKeyValueChange, newValue: V?, oldValue: V?, isPrior: Bool) {
self.kind = kind
self.newValue = newValue
self.oldValue = oldValue
self.isPrior = isPrior
}
}
// MARK: - CoreStoreObjectObjectDiff
public final class CoreStoreObjectObjectDiff<D: CoreStoreObject> {
/**
Indicates the kind of change. See the comments for `NSObject.observeValue(forKeyPath:of:change:context:)` for more information.
*/
public let kind: NSKeyValueChange
/**
`newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
*/
public private(set) lazy var newValue: D? = self.newNativeValue.flatMap(D.cs_fromRaw(object:))
/**
`newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
*/
public private(set) lazy var oldValue: D? = self.oldNativeValue.flatMap(D.cs_fromRaw(object:))
/**
'isPrior' will be `true` if this change observation is being sent before the change happens, due to `.prior` being passed to `observe()`
*/
public let isPrior: Bool
// MARK: FilePrivate
fileprivate init(kind: NSKeyValueChange, newNativeValue: CoreStoreManagedObject?, oldNativeValue: CoreStoreManagedObject?, isPrior: Bool) {
self.kind = kind
self.newNativeValue = newNativeValue
self.oldNativeValue = oldNativeValue
self.isPrior = isPrior
}
// MARK: Private
private let newNativeValue: CoreStoreManagedObject?
private let oldNativeValue: CoreStoreManagedObject?
}
// MARK: - CoreStoreObjectUnorderedDiff
public final class CoreStoreObjectUnorderedDiff<D: CoreStoreObject> {
/**
Indicates the kind of change. See the comments for `NSObject.observeValue(forKeyPath:of:change:context:)` for more information.
*/
public let kind: NSKeyValueChange
/**
`newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
*/
public private(set) lazy var newValue: Set<D> = Set(self.newNativeValue.map({ D.cs_fromRaw(object: $0 as! NSManagedObject) }))
/**
`newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
*/
public private(set) lazy var oldValue: Set<D> = Set(self.oldNativeValue.map({ D.cs_fromRaw(object: $0 as! NSManagedObject) }))
/**
'isPrior' will be `true` if this change observation is being sent before the change happens, due to `.prior` being passed to `observe()`
*/
public let isPrior: Bool
// MARK: FilePrivate
fileprivate init(kind: NSKeyValueChange, newNativeValue: NSOrderedSet?, oldNativeValue: NSOrderedSet?, isPrior: Bool) {
self.kind = kind
self.newNativeValue = newNativeValue ?? []
self.oldNativeValue = oldNativeValue ?? []
self.isPrior = isPrior
}
// MARK: Private
private let newNativeValue: NSOrderedSet
private let oldNativeValue: NSOrderedSet
}
// MARK: - CoreStoreObjectOrderedDiff
public final class CoreStoreObjectOrderedDiff<D: CoreStoreObject> {
/**
Indicates the kind of change. See the comments for `NSObject.observeValue(forKeyPath:of:change:context:)` for more information.
*/
public let kind: NSKeyValueChange
/**
`newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
*/
public private(set) lazy var newValue: [D] = self.newNativeValue.map({ D.cs_fromRaw(object: $0 as! NSManagedObject) })
/**
`newValue` and `oldValue` will only be non-nil if `.new`/`.old` is passed to `observe()`. In general, get the most up to date value by accessing it directly on the observed object instead.
*/
public private(set) lazy var oldValue: [D] = self.oldNativeValue.map({ D.cs_fromRaw(object: $0 as! NSManagedObject) })
/**
`indexes` will be `nil` unless the observed KeyPath refers to an ordered to-many property
*/
public let indexes: IndexSet
/**
'isPrior' will be `true` if this change observation is being sent before the change happens, due to `.prior` being passed to `observe()`
*/
public let isPrior: Bool
// MARK: FilePrivate
fileprivate init(kind: NSKeyValueChange, newNativeValue: NSArray?, oldNativeValue: NSArray?, indexes: IndexSet, isPrior: Bool) {
self.kind = kind
self.newNativeValue = newNativeValue ?? []
self.oldNativeValue = oldNativeValue ?? []
self.indexes = indexes
self.isPrior = isPrior
}
// MARK: Private
private let newNativeValue: NSArray
private let oldNativeValue: NSArray
}
// MARK: - AttributeProtocol
extension AttributeProtocol {
// MARK: FilePrivate
fileprivate func observe<O: CoreStoreObject, V: ImportableAttributeType>(with options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectValueDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
let result = _CoreStoreObjectKeyValueObservation(
object: self.rawObject!,
keyPath: self.keyPath,
callback: { (object, kind, newValue, oldValue, _, isPrior) in
let notification = CoreStoreObjectValueDiff<V>(
kind: kind,
newNativeValue: newValue as! V.QueryableNativeType?,
oldNativeValue: oldValue as! V.QueryableNativeType?,
isPrior: isPrior
)
changeHandler(
O.cs_fromRaw(object: object),
notification
)
}
)
result.start(options)
return result
}
fileprivate func observe<O: CoreStoreObject, V: NSCoding & NSCopying>(with options: NSKeyValueObservingOptions = [], changeHandler: @escaping (O, CoreStoreObjectTransformableDiff<V>) -> Void) -> CoreStoreObjectKeyValueObservation {
let result = _CoreStoreObjectKeyValueObservation(
object: self.rawObject!,
keyPath: self.keyPath,
callback: { (object, kind, newValue, oldValue, _, isPrior) in
let notification = CoreStoreObjectTransformableDiff<V>(
kind: kind,
newValue: newValue as! V?,
oldValue: oldValue as! V?,
isPrior: isPrior
)
changeHandler(
O.cs_fromRaw(object: object),
notification
)
}
)
result.start(options)
return result
}
}
// MARK: - _CoreStoreObjectKeyValueObservation
// Mirrored implementation from https://github.com/apple/swift/blob/6e7051eb1e38e743a514555d09256d12d3fec750/stdlib/public/Darwin/Foundation/NSObject.swift#L141
fileprivate final class _CoreStoreObjectKeyValueObservation: NSObject, CoreStoreObjectKeyValueObservation {
// MARK: FilePrivate
fileprivate init(object: CoreStoreManagedObject, keyPath: KeyPathString, callback: @escaping (_ object: CoreStoreManagedObject, _ kind: NSKeyValueChange, _ newValue: Any?, _ oldValue: Any?, _ indexes: IndexSet?, _ isPrior: Bool) -> Void) {
let _ = _CoreStoreObjectKeyValueObservation.swizzler
self.keyPath = keyPath
self.object = object
self.callback = callback
}
fileprivate func start(_ options: NSKeyValueObservingOptions) {
self.object?.addObserver(self, forKeyPath: self.keyPath, options: options, context: nil)
}
deinit {
self.object?.removeObserver(self, forKeyPath: self.keyPath, context: nil)
}
// MARK: DynamicObjectKeyValueObservation
public func invalidate() {
self.object?.removeObserver(self, forKeyPath: self.keyPath, context: nil)
self.object = nil
}
// MARK: Private
// workaround for <rdar://problem/31640524> Erroneous (?) error when using bridging in the Foundation overlay
@nonobjc static var swizzler: Any? = cs_lazy {
let bridgeClass: AnyClass = _CoreStoreObjectKeyValueObservation.self
let rootObserveImpl = class_getInstanceMethod(
bridgeClass,
#selector(_CoreStoreObjectKeyValueObservation.observeValue(forKeyPath:of:change:context:))
)!
let swapObserveImpl = class_getInstanceMethod(
bridgeClass,
#selector(_CoreStoreObjectKeyValueObservation._cs_swizzle_me_observeValue(forKeyPath:of:change:context:))
)!
method_exchangeImplementations(rootObserveImpl, swapObserveImpl)
return nil
}
@nonobjc private weak var object: CoreStoreManagedObject?
@nonobjc private let callback: (_ object: CoreStoreManagedObject, _ kind: NSKeyValueChange, _ newValue: Any?, _ oldValue: Any?, _ indexes: IndexSet?, _ isPrior: Bool) -> Void
@nonobjc private let keyPath: KeyPathString
@objc private dynamic func _cs_swizzle_me_observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSString: Any]?, context: UnsafeMutableRawPointer?) {
guard
let object = object as? CoreStoreManagedObject,
object == self.object,
let change = change
else {
return
}
let rawKind: UInt = change[NSKeyValueChangeKey.kindKey.rawValue as NSString] as! UInt
self.callback(
object,
NSKeyValueChange(rawValue: rawKind)!,
change[NSKeyValueChangeKey.newKey.rawValue as NSString],
change[NSKeyValueChangeKey.oldKey.rawValue as NSString],
change[NSKeyValueChangeKey.indexesKey.rawValue as NSString] as! IndexSet?,
change[NSKeyValueChangeKey.notificationIsPriorKey.rawValue as NSString] as! Bool? ?? false
)
}
}