stateflow to mutablestateflow

StateFlow được nâng lên stable API kể từ phiên bản Kotlin Coroutines 1.4.0. Haziran 28, 2021. At its core, the API for SavedStateFlow is very simple as it’s supposed to be similar to a MutableStateFlow. If you add a new collector in the … StateFlowの記事はたくさんありましたが、LiveDataすら知らない自分には難しいものが多かったので初心者向けとしてStateFlowとViewModelが動くサンプルを作りました。 ... MutableStateFlowは値の変更ができるStateFlowで、UIの変更を変数に反映する双方向的 … StateFlow. Android Development, Kotlin / March 5, 2022. Firstly, we need a form layout. StateFlow. If you need a Flow somewhere you can use snapshotFlow {} to get one. It returns an implementation of MutableStateFlow with the given From a design standpoint however, it restricts modification of the StateFlow value outside of your containing class. import kotlinx.coroutines.flow.StateFlow Unresolved reference: StateFlow. Cold Stream vs Hot Stream. Like SharedFlow can replace BroadcastChannel completely, StateFlow can replace ConflatedBroadcastChannel completely. You can set your mutableStateFlow.value many times, but unless !oldValue.equals (newValue), then a new value won’t be emitted. class DownloadingModel {private val _state = MutableStateFlow(DownloadStatus.NOT_REQUESTED) val state: StateFlow get() = _state This problem is discussed a lot. private val defaultButtonTintColor = "#1B1717". StateFlow is designed to completely replace ConflatedBroadcastChannel. I have a Fragment, that represents a screen in a single activity app, and a ViewModel for this fragment. Hi, I have a questionWe can create LiveData or StateFlow in a similar way as below. For example a StateFlow can be exposed from the YourViewModel so that the View can listen for UI state updates and inherently make the screen state survive configuration changes. Press question mark to learn the rest of the keyboard shortcuts emit (UIState. 比如我们设置一个按钮每次点击都会重新设置Livedata或StateFlow的value值（值不变，比如设置value=4），StateFlow只会收到一次回调，但是Livedata可以无限收到回调。下面两小节分别用代 … * Returns a [StateFlow] that access data associated with the given key. This is generally seen as a replacement for LiveData on Android but also, importantly, something that can be used in shared Kotlin Multiplatform code. val _liveData = MutableLiveData(0) val _stateFlow = MutableStateFlow(0) But In LiveData, we can ensure the data is saved and restored by using. StateFlow es un flujo observable contenedor de estados que emite actualizaciones de estado actuales y nuevas a sus recopiladores. The current state value can also be read through its value property. Sometimes we have some value where it starts from MutableState. Then we can, do the API call in fetchUser function. StateFlow A StateFlow is a Flow that can hold a value, its state. StateFlow and Channels. cold flows, hot channels) Hi, today I come to you with a quick tip on how to update your StateFlows safely in Kotlin. StateFlow conflation is based on equality like distinctUntilChanged operator, unlike conflation in ConflatedBroadcastChannel that is based on reference identity. The stateIn is the key method used in this example, it creates a StateFlow starting from a regular Flow and connects it to the viewModelScope. The MutableStateFlow interface is not stable for inheritance in 3rd party libraries, as new methods … A mutable value holder where reads to the value property during the execution of a Composable function, the current RecomposeScope will be subscribed to changes of that value. /**. Here v1 and v2 are defined as MutableStateFlow instead of MustableState, using combine a Flow that emits a new Pair every time one of the values changes can be created. * @param scope The scope used to synchronize the [StateFlow] and [SavedStateHandle] * @param key The identifier for the value. Di Android, StateFlow sangat cocok untuk class yang perlu mempertahankan status yang dapat diubah dan diamati. And I added two backgroundTint color for form states. The API for StateFlow is almost identical to LiveData. You can access StateFlow’s current state by .value property, just like in LiveData. Holds list of expanded card ids in _expandedCardIdsList, and exposes them to observers via expandedCardIdsList field. StateFlow and MutableStateFlow are not available in Kotlin multiplatform common code:. the strategy that controls when sharing is started and stopped. I am now implementing MutableStateFlow to store the cache value in Android MVVM architecture . The general pattern for state hoisting in Jetpack Compose is to replace the state variable with two parameters: value: T: the current value to display. StateFlow is a state-holder observable flow that emits the current and new state updates to its collectors. StateFlow is a state-holder observable flow that emits the current and new state updates to its collectors. *. That’s why we define ViewModelStateFlow that will wrap “real” StateFlow: sealed class ViewModelStateFlow(stateFlow: StateFlow) : StateFlow by stateFlow. How we use LiveData At Fabernovel, all our new Android application are written in Kotlin. on my MutableList above but can’t achieve that. Error) stateFlow. value 속성을 통해서도 현재 상태 값을 읽을 수 있습니다. I am learning about MutableStateFlow and MutableSharedFlow. Recently a new version of Kotlin Coroutines library was released with a few new extensions functions to help you with StateFlow updates. The question is published on December 3, 2020 by Tutorial Guruji team. Have a look: Here the MutableStateFlow is the private meaning that can only be updated fromviewModel. StateFlow 는 현재 상태와 새로운 상태 업데이트를 수집기에 내보내는 관찰 가능한 상태 홀더 흐름입니다. StateFlow has a clear separation into a read-only StateFlow interface and a MutableStateFlow. ; This runs when the lifecycle is at least in the STARTED state. Therefore, I … LiveData is readable and writeable only on UI thread ( postValue moves the write to UI thread), but Flow is Kotlin Coroutine stuff ( not Flowable in this case, not Rx). They have said that in a future version of Kotlin, there will probably be a better syntax for exposing a read-only version of a … Di Android, StateFlow sangat cocok untuk class yang perlu mempertahankan status yang dapat diubah dan diamati. I could start a coroutine that checks every n ms if the list has changed and update the value, but this would be very bad code. StateFlow interface is a read-only view that gives access to the current value and implements a Flow to collect updates to the values. So we cannot do val mutableStateFlow = ... val stateFlow = mutableStateFlow.map { ... }.asStateFlow () Because there is no asStateFlow () for a simple Flow. MutableStateFlow not working with MutableList . It’s like channels but the most important difference a flow represens a cold stream of values. StateFlow. Snapshot state is generally easier to work with via the property delegates and works transitively across the call stack without having to assemble an operator chain. A helper function to let you expose a MutableStateFlow from a SavedStateHandle. Also change mutableStateOf to MutableStateFlow. android code Inside catch block, we will update the state to error and in collect, we will update the state value to success and pass the successful response to it. StateFlow. value 속성을 통해서도 현재 상태 값을 읽을 수 있습니다. Value setter in MutableStateFlow is public and there is nothing we can do about it. Flows are constructed on top of coroutines and can return multiple values. SavedStateFlow API. MutabaleStateFlow interface adds value-modification operation. StateFlow always has a value that can be read at any time using value property. Para actualizar el estado y enviarlo al flujo, asigna un nuevo valor a la propiedad value de la clase MutableStateFlow. Hey I am learning flow in kotlin. StateFlow dan SharedFlow adalah Flow API yang memungkinkan alur memunculkan pembaruan status dan nilai secara optimal ke beberapa konsumen. MutabaleStateFlow interface cung cấp khả năng sửa đổi giá trị. StateFlow dan SharedFlow adalah Flow API yang memungkinkan alur memunculkan pembaruan status dan nilai secara optimal ke beberapa konsumen. The shareIn function creates a SharedFlow and sends elements from its Flow.Since we need to start a coroutine to collect elements on flow, shareIn expects a coroutine scope as the first argument. initialValue. StateFlow is a SharedFlow with a couple other things: When creating a StateFlow you have to provide its initialState. This value is also used when the state flow is reset using the SharingStarted.WhileSubscribed strategy with the replayExpirationMillis parameter. Using StateFlow to Deliver Results to the UI. SavedStateHandle+StateFlow.kt. Please note, it has to be called from a coroutine or suspend function. StateFlow StateFlow is a state-holder observable flow that emits the current and new state updates to its collectors. Error}}} Tests Passed. In the next steps, you'll utilize StateFlow to deliver the updated results to the UI and improve the structure of the app. Questions tagged kotlin-stateflow. Exit fullscreen mode. val stateFlow = MutableStateFlow < UIState >(UIState. Like List and MutableList, StateFlow comes with a MutableStateFlow. Assume that the fragment has 2 views, each view is collecting data from a StateFlow related to it. Well, here you have it, but 100% kotlin, and not a workaround anymore. It’s more proper to use a property: private val mutableState = MutableStateFlow (HomeMainFragmentState.Init) val state: StateFlow get () = mutableState. It can be exposed to the outside world as either StateFlow if fast non-reactive access to the value is needed, or as Flow if only reactive view of updates to the value is needed. Hey I am learning flow in kotlin. Create a Saveable Mutable State Flow. You have a MutableStateFlow that "drives" the StateFlow (similar to how a MutableLiveData "drives" a LiveData). A flow, for example, can be used to receive real-time updates from a database. private val onFormValidButtonTintColor = "#4F774F". If you are more interested in … The major difference is that LiveData only comes with observe and observeForever out of the box, and MediatorLiveData is a means of composing multiple LiveData in various ways. class MyViewModel(private val repository: Repository) : ViewModel() { private val userNameFlow = MutableStateFlow("") // 1. March 5, 2022. MutableStateFlow always takes always a default value, so here it would be the loading state. Use of SharedFlow in Android kotlin . There is a value property that can be mutated and a method that can expose it as a StateFlow. Now we create stateFlow variables for form elements. Then, the flow actually emits its first delayed value. Provides list of cards using getFakeData() function.We need a coroutine here, to emit the testList into … We’ve declared an instance of StateFlow i.e. This class serves 5 purposes: Holds list of cards using MutableStateFlow in _cards field, and exposes a StateFlow to observers via cards field. StateFlow is simpler and more efficient than ConflatedBroadcastChannel. 上記でも書いたとおり、StateFlowとMutableStateFlowでクラスが分かれていることが書かれています。外部に公開する際に、必要な型で公開すれば良いので、これは便利そ … Hello Developer, Hope you guys are doing great. StateFlow es un flujo observable contenedor de estados que emite actualizaciones de estado actuales y nuevas a sus recopiladores. Make sure to update your StateFlow safely in Kotlin! suspendFunc (it) }.stateIn(. This is because the state flow is a hot flow, and hot flows never complete. However, you are not limited to onValueChange. ViewModel uses multiple repositories for loading a set of data from multiple API calls and emit this data to the fragment via multiple StateFlow.. Hi everyone, in this article we will implement a form validation with Kotlin Flow and StateFlow. When collecting a StateFlow this is not handled automatically.. To address this issue you can either … 異なる点としては、StateFlowでは初期値が必須になります。 El valor de estado actual también se puede leer a través de su propiedad value. Basically, what I would like to call it, is simply a “Single Event StateFlow”. Today at Tutorial Guruji Official website, we are sharing the answer of Trying to expose SavedStateHandle.getLiveData() as MutableStateFlow, but the UI thread freezes without wasting too much if your time. Raw. public inline fun MutableStateFlow.update (function: (T) -> T) { while (true) { val prevValue = value val nextValue = function (prevValue) if (compareAndSet (prevValue, nextValue)) { return } } } As we can see, a function is passed as a param and it’s applied to the current StateFlow ’s value. A MutableStateFlow(x) constructor function is provided. That's why the flow starts with. ... tetapkan nilai baru ke properti value dari class MutableStateFlow. Explore the latest questions and answers asked by our top developers. From a technical standpoint, this is a redundant step and doesn't make a difference. Here v1 and v2 are defined as MutableStateFlow instead of MustableState, using combine a Flow that emits a new Pair every time one of the values changes can be created. StateFlow gồm hai biến thể: StateFlow và MutableStateFlow: StateFlow interface chỉ cung cấp quyền truy cập giá trị. The current state value can also be read through its value property. Explore the latest questions and answers asked by our top developers. test {expectItem shouldBe UIState. StateFlow được nâng lên stable API kể từ phiên bản Kotlin Coroutines 1.4.0. A flow is a type in coroutines that can emit multiple values sequentially, as opposed to suspend functions, which only return a single value. One of them was the introduction of SharedFlow. Example: @Test fun testStateFlow () = runBlockingTest { val flow = MutableStateFlow ("") flow.collect { Assert.assertEquals ("", it) } } This part of code will have a result like java.lang.IllegalStateException: This job has not completed yet, as StateFlow and MutableStateFlow can't be completed. Provides list of cards using getFakeData() function. @Test fun `When getStateFlow is called, it should emit values correctly` = runBlocking { val stateFlow = mainViewModel.getStateFlow() assertEquals(listOf(10), stateFlow.toList()) } If you run this test, you will notice that it keeps running forever. The key lines that provide the binding are android:text=”@{viewModel.names}” and android:text=”@={viewModel.addedName}”. StateFlow has a clear separation into a read-only StateFlow interface and a MutableStateFlow. LiveDataにはStateFlow、MutableLiveDataにはMutableStateFlowが対応します。 - private val mutableData = MutableLiveData("") - val data: LiveData = mutableData + private val mutableData = MutableStateFlow("") + val data: StateFlow = mutableData. MutabaleStateFlow interface cung cấp khả năng sửa đổi giá trị. the initial value of the state flow. The one for the next second. And bind text listeners. The first step is to create the layout file that will have StateFlow field bound to TextView with OneWayBinding and another instance of StateFlow bound to TextInputEditText with TwoWayBinding.. To update state and send it to the flow, assign a new value to the value property of the MutableStateFlow class. private val _uiState = MutableStateFlow(HomeUiState())val uiState: StateFlow = _uiState.asStateFlow()_uiState.value = _uiState.value.copy(bannerList = Result.Success(it)) 需要更新 State 时，借助 data class 的 copy 方法可以快捷地拷贝构造一个新实例。 Immutable 还体现在集合类的类型上。 There are a couple reasons for this. A mutable StateFlow that provides a setter for value.An instance of MutableStateFlow with the given initial value can be created using MutableStateFlow(value) constructor function.. See the StateFlow documentation for details on state flows.. Not stable for inheritance. Hello Developer, Hope you guys are doing great. I am learning about MutableStateFlow and MutableSharedFlow. StateFlow. (totalSeconds - 1 downTo 0).asFlow() Enter fullscreen mode. Implement Instant Search Using Kotlin Flow Operators. StateFlow is a SharedFlow with a couple other things: When creating a StateFlow you have to provide its initialState. This is just a simple case of encapsulation (and is unrelated to data binding/Android). Kotlin Flows, is a type that can emit multiple values sequentially. If you want a current state of the StateFlow without terminating the flow and without getting the state from the suspend function, use StateFlow.value. Here is code usage example: This class is public and is meant to be used in all places. Recently a new version of Kotlin Coroutines library was released with a few new extensions functions to help you with StateFlow updates. Holds list of “revealed” card ids in _revealedCardIdsList, and exposes them to observers via revealedCardIdsList field. LiveData automatically unregisters the consumer when the view goes to the STOPPED state. Google’s Adam Powell replied: imo use [Mutable]State for things consumed by your UI. Holds list of cards using MutableStateFlow in _cards field, and exposes a StateFlow to observers via cards field. val stateFlowTrigger = someMutableStateFlow. Next, let’s check out our DogRepository, which contains our search query as a MutableStateFlow. private val email = MutableStateFlow("") private val password = MutableStateFlow("") Remember single event LiveData workaround? The stateIn is the key method used in this example, it creates a StateFlow starting from a regular Flow and connects it to the viewModelScope. Para actualizar el estado y enviarlo al flujo, asigna un nuevo valor a la propiedad value de la clase MutableStateFlow. Use of SharedFlow in Android kotlin . I'm using StateFlow under the hood, but still exposing LiveData in my API. You can access StateFlow’s current state by .value property, just like in LiveData. It can be called on the StateFlow as it inherits the function from Flow class. I tried to learn MutableStateFlow in real world example. MutableStateFlow has a setter property for value. Create A SafeMutableLiveData That Is Non-Nullable. StateFlow and Sharedflow... the end of LiveData? / March 5, 2022 then, the API for StateFlow < T.! Class yang perlu mempertahankan status yang dapat diubah dan diamati state value can also be read at time. A read-only field ) to get one, 2021 using the SharingStarted.WhileSubscribed strategy the... And snippets this issue: the droidcon 2022 Special Edition Socks for Charity are available. The replayExpirationMillis parameter change state from Compose to StateFlow estados que emite actualizaciones estado... Provides list of “ revealed ” card ids in _revealedCardIdsList, and exposes them to via! Mutablestateflow Didn ’ T emit of StateFlow i.e para actualizar el estado y enviarlo al flujo, un... Drives '' a LiveData ) typical use-cases of keeping track of state where you only want emit! > val StateFlow = MutableStateFlow < UIState > ( UIState or suspend function Android, from LiveData to StateFlow that... Is public, meaning it can be used in all places completely, StateFlow sangat cocok untuk yang. Dapat diubah dan diamati ( ) function and hot flows never complete initial value,... Update the app to use StateFlow, open MainViewModel.kt and change state from Compose to StateFlow - Fabernovel /a... Is at least in the started state can expose it as a related. Baru ke properti value dari class MutableStateFlow comes with a few new extensions functions to you... Meaning it can be mutated and a MutableStateFlow StateFlow và MutableStateFlow: <. Value that can be accessed from the view goes to the fragment has 2 views, each view collecting! Both mutable and immutable types to control what is exposed and channels real-time... By... < /a > MutableStateFlow always takes always a default stateflow to mutablestateflow, so here it would be loading... Emits the current state and send it to the value property is to! Redundant step and does n't make a difference ; note that ( 2 ) might be an issue nuevas. The end of LiveData? like list and MutableList, StateFlow comes with a few new functions. Returns an implementation of MutableStateFlow with the given initial value using the SharingStarted.WhileSubscribed strategy the! //Fabernovel.Github.Io/2020-12-07/Android-From-Livedata-To-Flows '' > state flow is reset using the SharingStarted.WhileSubscribed strategy with the given initial value this flow a... Change state from Compose to StateFlow - Fabernovel < /a > SavedStateFlow API downTo 0 ).asFlow ( ) fullscreen! Kotlin flows, hot channels ) < a href= '' https: //blog.ganen.moe/posts/2021-06-12-flow-and-beyond/ '' > MutableState or StateFlow s... Update your StateFlow safely in Kotlin above but can ’ T emit > step to avoid properties. Hai biến thể: StateFlow và MutableStateFlow: StateFlow < T > interface chỉ cung quyền. Can emit multiple values sequentially property that can be read through its value property the... Binding/Android ) achieve that = runBlockingTest { StateFlow from the view goes to the value is. Is based on equality like distinctUntilChanged operator, unlike stateflow to mutablestateflow in ConflatedBroadcastChannel that is based on reference identity reset the. Y nuevas a sus recopiladores to avoid backing properties for StateFlow is designed to better typical... With LiveData, StateFlow always has a value that can expose it as a StateFlow to observers via revealedCardIdsList.! To use StateFlow, open MainViewModel.kt and change state from Compose to StateFlow share code, notes, and a.: //medium.com/scalereal/stateflow-end-of-livedata-a473094229b3 '' > StateFlow observe at one time your Stateflows safely in Kotlin types to control what is.. Share code, notes, and exposes them to observers via expandedCardIdsList field to completely replace ConflatedBroadcastChannel completely Stateflows in! Today I come to you with a MutableStateFlow ( x ) constructor function is stateflow to mutablestateflow! I would like to call it, is simply a “ Single Event StateFlow ” type that can it. Like channels but the most important difference a flow somewhere you can use snapshotFlow { } get... N'T make a difference ( UIState here the MutableStateFlow class subscribed RecomposeScopes will be scheduled with! La clase MutableStateFlow be read through its value property of the MutableStateFlow class March 5, 2022 //jetc.dev/slack/2021-05-15-mutablestate-stateflow.html '' state! Properti value dari class MutableStateFlow Didn ’ T emit SavedStateFlow API with this issue: droidcon... Downto 0 ).asFlow ( ) Enter fullscreen mode StateFlow interface and a MutableStateFlow ( ) function a great to! One time meant to be used in all places a “ Single Event StateFlow.. Valor a la propiedad value recomposition of any subscribed RecomposeScopes will be scheduled > Haziran 28 2021! Success ) @ Test fun ` should emit default value, so here would... First delayed value using Compose: MutableStateFlows or... < /a > StateFlow y <... } to get one and a method that can expose it as a StateFlow related to it we will a... Like list and MutableList, StateFlow sangat cocok untuk class yang perlu mempertahankan status yang dapat diubah dan diamati es. There is a change 上記でも書いたとおり、stateflowとmutablestateflowでクラスが分かれていることが書かれています。外部に公開する際に、必要な型で公開すれば良いので、これは便利そ … < a href= '' https: //medium.com/scalereal/stateflow-end-of-livedata-a473094229b3 '' make! Mempertahankan status yang dapat diubah dan diamati and exposes them to observers via expandedCardIdsList field > state flow T. Which we ’ re exposing for activity ( it ’ s current by! //Developer.Android.Com/Kotlin/Flow/Stateflow-And-Sharedflow? hl=es-419 '' > StateFlow has a clear separation into a read-only field ) a default value =! ) @ Test fun ` should emit default value ` = runBlockingTest { StateFlow and not workaround... Mutablestateflow < UIState > ( UIState as it ’ s current state and send to! Restricts modification of the MutableStateFlow is the private meaning that can be accessed from the view goes the. Distinctuntilchanged operator, unlike conflation in ConflatedBroadcastChannel that is based on reference identity state changes in time from. Sometimes we have some value where it starts from MutableState identical to LiveData in _revealedCardIdsList and! Latest Questions and answers asked by our top developers top developers ganen blog ) @ Test fun should... Data from multiple API calls and emit this data to the stateflow to mutablestateflow is also used when the state .! Is unrelated to data binding/Android ) our new Android application are written in Kotlin on equality distinctUntilChanged... Value property of the MutableStateFlow class y nuevas a sus recopiladores channels ) < a href= https... Views, each view is collecting data from multiple API calls and emit this data to the thread, a. Es un flujo observable contenedor de estados que emite actualizaciones de estado actual también se puede leer a de... Do the API for SavedStateFlow is very simple as it ’ s like channels but the important., what I would like to call it, is a type that can expose it a... Can be read through its value property supposed to be similar to a MutableStateFlow ( x ) constructor function provided... Special Edition Socks for Charity are now available a href= '' https: //developer.android.com/kotlin/flow/stateflow-and-sharedflow? hl=ko '' > StateFlow /a... On how to update state and send it to the flow, and snippets expandedCardIdsList field collectors will the! Channels ) < a href= '' https: //fabernovel.github.io/2020-12-07/android-from-livedata-to-flows '' > StateFlow, end of LiveData? we! Use-Cases of keeping track of state changes in time have it, simply! It to the fragment via multiple StateFlow a technical standpoint, this is just simple... Has 2 views, each view is collecting data from a StateFlow related to.. Can not be closed like ConflatedBroadcastChannel and can return multiple values only updated! Special Edition Socks for Charity are now available > interface cung cấp khả năng sửa đổi trị. Well, here you have a MutableStateFlow avoid backing properties for StateFlow is suitable for current... To data binding/Android ): //proandroiddev.com/make-sure-to-update-your-stateflow-safely-in-kotlin-9ad023db12ba '' > make sure to update the app to use StateFlow, open and. Mutablestateflow that `` drives '' a LiveData ) library was released with a few new extensions to. Stateflow updates, each view is collecting data from a technical standpoint, is! Expose it as a StateFlow technical standpoint, this is a change estado... Outside of your containing class we ’ ve declared an instance of StateFlow i.e Didn ’ emit! = MutableStateFlow < UIState > ( UIState a quick tip on how to update state! Y nuevas a sus recopiladores Edition Socks for Charity are now available simple as it ’ s supposed to used. El estado y enviarlo al flujo, asigna un nuevo valor a propiedad! Is based on equality like distinctUntilChanged operator, unlike conflation in ConflatedBroadcastChannel that is based on reference identity,! Stateflow < T > interface cung cấp quyền truy cập giá trị when! On December 3, 2020 by Tutorial Guruji team better cover typical use-cases of keeping of! Real-Time updates from a technical standpoint, this is because the state flow is a type that can be. Views, each view is collecting data from a StateFlow ’ T achieve.! Need a flow represens a cold stream of values you can use snapshotFlow { } to one. Kotlin, and not a workaround anymore showing current state value can also be read through its value.!, each view is collecting data from multiple API calls and emit this to. Observers via expandedCardIdsList field 2022 Special Edition Socks for Charity are now available.asFlow ( Enter! Nuevo valor a la propiedad value de la clase MutableStateFlow current state and send it the... Emits its first delayed value actual también se puede leer a través de su propiedad.! Ve declared an instance of StateFlow i.e for form states few new extensions functions to help you with StateFlow..
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