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added fake progress for lightweight migrations

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This commit is contained in:
John Rommel Estropia
2017-11-13 02:44:26 +09:00
parent 49c4b770eb
commit 66dd5b6f27
1 changed files with 32 additions and 1 deletions
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33
Sources/DataStack+Migration.swift
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@@ -688,8 +688,35 @@ public extension DataStack {
do {
let timerQueue = DispatchQueue(
label: "DataStack.lightweightMigration.timerQueue",
qos: .utility,
attributes: []
)
let estimatedTime: TimeInterval = 60 * 3 // 3 mins
let interval: TimeInterval = 1
let fakeTotalUnitCount: Float = 0.9 * Float(progress.totalUnitCount)
var fakeProgress: Float = 0
var recursiveCheck: () -> Void = {}
recursiveCheck = {
guard fakeProgress < 1 else {
return
}
progress.completedUnitCount = Int64(fakeTotalUnitCount * fakeProgress)
fakeProgress += Float(interval / estimatedTime)
timerQueue.asyncAfter(
deadline: .now() + interval,
execute: recursiveCheck
)
}
timerQueue.async(execute: recursiveCheck)
_ = try withExtendedLifetime(NSPersistentStoreCoordinator(managedObjectModel: destinationModel)) { (coordinator: NSPersistentStoreCoordinator) in
try coordinator.addPersistentStoreSynchronously(
type(of: storage).storeType,
configuration: storage.configuration,
@@ -699,6 +726,10 @@ public extension DataStack {
)
)
}
timerQueue.sync {
fakeProgress = 1
}
_ = try? storage.cs_finalizeStorageAndWait(soureModelHint: destinationModel)
progress.completedUnitCount = progress.totalUnitCount
return