kotlin inner class memory leak

Like any other instance variable, we can KT-47669 IR inliner doesn't handle inner class functions referring outer this; KT-48668 JVM IR: "ISE: Value at CLASS must not be null for CLASS" for modules with a dependency cycle; KT-49370 JVM / IR: "java.lang.VerifyError: Bad local variable type" with "fun Long.mod" and non-trivial argument; KT-46744 Memory Leaks in Kotlin daemon We are going to do that to show how memory leaks occur and how LeakCanary detects them. So, you need not worry about static inner class in Kotlin. You can also create a kotlin one and use the code converter to convert from java to kotlin. The inner class maintains an instance of the outer class So, it can access members of the outer class. This is why it is possible to call instance methods in the outer class from the inner class. However, the nonstatic class will hold the implicit reference of the parent class which can cause the memory leak problem. 3) Anonymous inner classes. 2. It carries a reference to an object of an outer class. 2021-09-13 | 0 0 | memory leak handler inner class Android Kotlin java [Android] Fragment Sample. Some other listeners held by the process may have the memory leaks,which you should take more care of, say LocationListener, so if you do not unregister it by your own, it will remain registered, and if you declare it as non-static inner class, which may leak the memory. Kotlin's solution is to say that you can't do this. The value of a variable that is declared using var can be changed anytime throughout the program. Benefits of Kotlin. Yeah, is just like a static method. Kotlin Edges out over Java in Conciseness With Google's official endorsement, Kotlin has become the most commonly used language for Android development. Edit (February 19, 2017): I received a very comprehensive reply from Mike Hearn regarding this issue: Like in Java, what happens in Kotlin varies in different cases. Step 1: Create Java or Kotlin Project. For instance, while defining an inner class inside an activity for running an asynchronous operation, the inner class will hold a reference to the outer activity class. The LeakActivity has a button that when pressed, creates a new Runnable that runs for 20 seconds. One workaround for this is to use static nested class. Visibility modifiers. forever for instances of some class; KT-40386 Memory leak detected: 'org.jetbrains.kotlin.idea.debugger.coroutine.view.XCoroutineView' KT-40635 Coroutines Debugger: make IDE plugin accept coroutines 1.3.8-rc* versions as well; KT-41505 Coroutines Debugger: "Access is allowed from event dispatch thread with IW lock only." IDE. Android AsyncTask Deprecated, Now What? We cannot directly create an object of the inner class. we pass the reference of saveInDb to complex sum and it straight away . 6. The consequences of memory leak is that it reduces the performance of the computer by reducing the amount of available memory. Publish and share your coding insight. Nested Inner class can access any private instance variable of outer class. Như vậy, sẽ là tốt hơn khi tạo ra các static inner class. However, there are some key differences between them: VAR(Variable) It is a general variable. Edit: the same thing occurs both with Json and ProtoBuf formats, I don't know if it's related to the formatters or the serialization phase itself. No permissions are needed for this project. Identifying the causes of memory leaks is not that easy though. In your MainActivity.kt, add the following code to see how LeakCanary works when detecting memory leaks. Another way to avoid memory leakage through lifecycle mismanagement is by using the new ViewModels from the Arch Components Library.. A ViewModel is an Abstract class that implements a single function known as onClear, which is called automatically when a particular object has to be removed. Java developers often ignore the way by which it implements nonstatic inner classes that keep on implicating the outer classes which are the prominent reason for memory leaks in Java apps. So there can be two solutions that can be proposed to solve this problem: One can make the inner class static As such, we can say that a nested class which is marked as " inner " is called inner class. 3. The heap is a chunk of memory where the system allocates Java/Kotlin objects. coroutine consumes resources 2019 2009 Android Developer Blog: Avoiding memory leaks 2016 KT-1622: Coroutine does not clear internal state Fixed Kotlin 1.4 Google deprecates AsyncTask Implicit Memory Leaks: Async Tasks class MainActivity : Activity First, we can declare a class inside another class using the keyword inner. As you can see, in this case there will be the memory leak until the long-running task is executed. 1.Kotlin中所有内部类默认是静态的（即嵌套类，不使用inner修饰），能减少很多内存泄漏的问题。. Static inner classes do not hold an implicit reference to . This forces unnecessary garbage collection events and slows the rest of the system. （如图2）. The question is published on November 7, 2013 by Tutorial Guruji team. Just like the object keyword is useful for create a singleton. Kotlin Inner Class. With the help of the inner class, we can access the outer class property inside the inner class. In Java, you have to make the inner class static by your own but in Kotlin, the inner class is by default static in nature. There are four visibility modifiers in Kotlin: private, protected, internal, and public. Inner classes are very common in Java and are used by many Android developers for various tasks because of their simplicity. A inner class can access members of outer class. Inner Classes. Inner class Reference. Check out my Github repository. Because the Runnable is an anonymous class it has a hidden reference to the outer LeakActivity and if the activity gets destroyed before the thread finished (20 seconds after pressing the button) then the activity will leak. Let's have a look into it with the help of a simple example again, Capturing inner classes, for example, leaves apps prone to memory leaks, especially when passing those on to asychronize operations. Since Kotlin's non-inlined lambdas hold the reference to the instance of the enclosing class they have similar issues regarding memory leaks. Syntax is pretty straight forward. An inner class is often used by the android developers within their code. Firstly, we would need to display the Memory tab by clicking on the window icon in the top-right corner of the Debug tool window. Inner Class Reference: Consider the below example — you have defined a inner class called LeakyClass.java as displayed below and you need to pass the activity in order to redirect to a new . A nice source for memory leaks can be the use of anonymous inner classes. Today at Tutorial Guruji Official website, we are sharing the answer of Kotlin helper object class memory leak without wasting too much if your time. KT-41934 NI: a type variable for lambda parameter has been inferred to nullable type instead of not null one. . If the lambda is passed to an inline function and isn't marked noinline, then the whole thing boils away and no additional classes or objects are created. It can be considered as a special nested class. To create an anonymous inner class in Kotlin, we have to use object expressions. The ViewModel is generated by the . Storing a reference to context, views, or objects in the background causes memory leaks. Having a binder inner class is the real culprit which holds a reference of its outer class hence holding the service instance. When we can declare a class inside another class using the keyword inner then it is called inner class. without wasting too much if your time. Step 2: Creating a memory leak. For example, suppose you have the following AsyncTask: class MyActivity : AppCompatActivity() { . In Java, if you forget to put static in front of the nested class that will generate the reference to the outer class. Non-static Inner Classes implementation in Java. Memory-leak with inner class. imcloudwu in imcloudwu's Blog. Kotlin helper object class memory leak. . I believe using a WeakReference to fix a memory leak indicates a lack of modeling or architecture. The issue arises when we follow the procedure of creating a bound service given by developers coloumn. There are basically four types of inner classes in java. To use it, we need to create an instance of the outer class first; we can't use inner classes without it. 使用的时候需要注意内存 . startForeground fail after upgrade to Android 8.1. Runtime overhead is no more. To ensure consistency and meaningful behavior of . Inner Classes. Conductor: Kotlin - lateinit memory leak issues. A memory leak can easily occur in Android when AsyncTasks, Handlers, Singletons, Threads, and other components are used incorrectly. Inner Classes. Just like nested class, it is created inside an outer class and unlike a nested class, it is marked with the keyword inner.It has advantages over nested class is that, it can access private members of outer class. Since Kotlin's non-inlined lambdas hold the reference to the instance of the enclosing class they have similar issues regarding memory leaks. 1) Nested Inner class. First the question, which class, nested or inner, stores the reference to an outer class? Kotlin helper object class memory leak Code Answer . When you leak memory it can't be released back to the heap. Today at Tutorial Guruji Official website, we are sharing the answer of how to prevent SWIG memory leak when applying global inner class workaround from SWIG manual section on Nested Classes? Inner classes are another common source of memory leaks because they can also have a reference to their container classes. Hello Developer, Hope you guys are doing great. Using Android Arch View Models as Presenters and LiveData. The nested classes in Kotlin don't approach the external class instance. Anonymous inner classes and non-static inner classes should NOT be used here as they hold references to the outer-class, which is the MainActivity, and that can be a potential source of memory leak. Inner classes. In Kotlin, these are called data classes and are marked with data: The compiler automatically derives the following members from all properties declared in the primary constructor: componentN () functions corresponding to the properties in their order of declaration. I recommend the book "kotlin in action". 2) Method Local inner classes. Sometimes it leads to memory leaks, when someone is holding a reference to an instance of an inner class without knowing that it also holds an outer instance. The Memory Profiler is a component in the Android Profiler that helps you identify memory leaks and memory churn that can lead to stutter, freezes, and even app crashes. No dependencies are needed for this project. Avoid using non-static inner classes in an activity if instances of the inner class could outlive the activity's lifecycle. You can declare a method and pass it as shown below. Ceremonious Verbosity. June 9, 2021 admin. But with improper usage, these inner classes can also lead to potential memory leaks. This however is not possible in kotlin, as far as I am aware (without reflection). Join CoderBridge to create your own tech blog, write coding notes, learn new skill and build your career. Never put any android context inside a static field (which in Kotlin goes into the companion object), it is a bad practice since you can get a memory leak that way. The Count: - a number indicating the amount . . Stop Using If-Else and Start Using When in Kotlin. . Kotlin vs Java - Key . Step 2: Dependencies. It won't leak forever though, after those 20 seconds it would be . You don't really have any problem if you are an Android developer and you do not use WeakReference. For memory leak tracking I have used LeakCanary's leakSentry which is really easy to integrate. . By default, all classes in Kotlin are final and that'll be an issue when it comes to building this in Gradle. For instance, here's how we can achieve the same thing in Kotlin: val channel = object : Channel { override fun isOpen() = false override fun close() { // omitted } } Instead of the new keyword, we're using the "object :" to represent the object expression . One workaround for this is to use static nested class. Classes, objects, interfaces, constructors, and functions, as well as properties and their setters, can have visibility modifiers. In fact, the only type of inner classes that do not have a reference to the outer class are static inner classes. Developers love clean and concise code which are easy to execute and complied. Build and run the app again to see if the leak was fixed by either using the Android Profiler or Leak Canary. A nested class marked as inner can access the members of its outer class. Ideally, this will tell the adapter what kind of item to bind in the RecyclerView at a given position. 4. Kotlin : safe lambdas (no memory leak)? But the companion is thread safe and avoid memory leaks. In my opinion, it can be sufficient to occasionally check small or hobby apps for leaks. For non-UI related request, it's safer to use application's context. Using Singletons in Kotlin. The default visibility is public. . Inner class can't be declared inside interfaces or non-inner nested classes. Support imcloudwu Also, there is one library called LeakCanary, that tells you about the class that is responsible for memory leaks in your Android application(if any). Step 3: Permissions. A companion object is useful for create factory methods in just one method. Any generic class instance, even one with a primitive type parameter, causes a memory leak when it is serialized. . The new "Leak Detection" feature of Android Studio 3.6 is a nice and convenient way of detecting leaking Fragments and Activities without adding a 3rd-party library to your application. How to create empty constructor for data class in Kotlin Android. Steps taken for IntelliJ Memory Leak Detection. I'll use threads, singletons, and listeners to demonstrate how we can cause leaks and how to avoid and fix them. Do đó, bạn không cần lo lắng về static inner class trong Kotlin. No more NullPointerException. If there is less coding, it will save a lot of time and efforts in the process of writing, reviewing and debugging it. Example: a listener is created in Kotlin, which is then registered with a Java class and allegedly unregistered again: public class Calculator { interface Listener { void onResult (int result); } Set<Listener> listeners = new HashSet<> (); void addListener . These classes have access to members of the enclosing class, even private members. To fix the problem, subclass the Handler in a new file or use a static inner class instead. We cannot declare an inner class inside an interface or non-inner class. Mark it as open such that Gradle can inherit from it and add its own logic. In Java to avoid the problem you have to use static inner class. Assume the following class where you want to compute s.th and return a Result-Object which derives from an Interface: interface Result{} class Outer { int[] data = null; public Outer(int s) { data = new int[s]; } Object getResult() { return new Result(){}; } } Eventually, in the worst case, too much of the available memory may become allocated and all or part of the system or device stops working correctly, the application fails, or the system slows down vastly . It is a very simple Activity which starts a long running task in a background thread (maybe a complex database query or a slow network call). A singleton's two most common use cases are: To share data between two otherwise unrelated areas of your project. Hello Developer, Hope you guys are doing great. The activity would still leak, because the anonymous inner class has an implicit reference to the outer class (in this case the activity). Note that the same is true with the anonymous Runnable class on line 15. 2 yr. ago. KT-47669 IR inliner doesn't handle inner class functions referring outer this; KT-48668 JVM IR: "ISE: Value at CLASS must not be null for CLASS" for modules with a dependency cycle; KT-49370 JVM / IR: "java.lang.VerifyError: Bad local variable type" with "fun Long.mod" and non-trivial argument; KT-46744 Memory Leaks in Kotlin daemon . var and val are both used to declare variables in Kotlin language. 1. level 1. Inner classes carry a reference to an object of an outer class: class Outer { private val bar: Int = 1 inner class Inner { fun foo() = bar } } val demo = Outer().Inner().foo() // == 1. Create a java project in android studio. Methods of the Cafe class can reference any property inside the companion object as if that property were declared as a field in the Cafe class itself. Nested in Kotlin is similar to a static nested class in Java and the Inner class is similar to a non-static nested class in Java. My lateinit properties are injected by dagger, and I need to set them to null in onDestroyView - or have a memory leak. As you can see, in this case there will be the memory leak until the long-running task is executed. That is something to keep in mind. No badge yet. In Kotlin, the default for nested and inter-clusters is different. 同僚とメモリリークの話になり自分の理解不足を痛感したので調査してみました。業務で開発しているアプリはメモリリークの問題で困っていないですが、事前にメモリリークしないようにコードを記述しておけば未然に防げる問題なので学んでおいて損はなさそう。前提動作確認した環境は . Many developers get tricked into introducing memory leaks in their applications in this way. Properties in the companion object can be . Getters always have the same visibility as their properties. copy () function (see below). . Inner class is a class which is created inside another class with watchword inner. 4) Static nested classes. Example: Any mobile app developer would prefer concise coding. However, the era of AsyncTask ended because, starting with Android 11, AsyncTask is deprecated. Some of the features of Kotlin: Interoperable with Java as it produces same byte code as Java does. KT-41913 NI: Kotlin 1.4 type inference breaks valid code. The above is an enum class used to determine the category of the landmark. The answer is inner class. Android. When using Kotlin and Java, memory leaks can occur in combination with Java Lambdas. In Java, developers have to follow many steps in a . Copied! Method reference in Kotlin is one of the most talked about and loved features. In Kotlin when you create a nested class you do not have access to the variables and methods of the class (equivalent of a static inner class) In addition, the inner classes, the anonymous inner classes and the outer classes make Java prone to memory leaks. Memory leaks are also a frequent problem with Java due to the way it implements anonymous inner classes and nested classes. In this post, I'll review the official statement motivating AsyncTask's deprecation . The Memory tab would display the following information as follows; The Class: - which is the name of the Class in use. Kotlin Inner class is created using the inner keyword. var is also called mutable and non-final variable, as there value can be changed anytime. For the past decade AysncTask has been a very popular approach for writing concurrent code in Android applications. Each item should have a generic structure/model defined by a data class. If you want to access the context in a class, either pass a context to it in it's constructor or if the class is like an activity, use getApplicationContext() to access the Context. Passing activity context to external classes or static instance. Conductor should boldly advertise (I don't think it's made obvious enough for new users) that its instances survive configuration changes (stark contrast to Activity/Fragment/View) - this has huge implications for dagger + kotlin users. It shows a realtime graph of your app's memory use and lets you capture a heap dump, force garbage collections, and track memory allocations. A singleton is a design pattern in which a given class has only one single instance inside the entire app. Here are two classes Hello and complex sum. Trong Java, bạn phải tạo các static inner class cho mình nhưng trong Kotlin, inner class mặc định là static một cách tự nhiên. Using Inner Classes : The use of inner classes can cause memory leaks inside your android application in a few cases. Kotlin hasn't implemented the . In addition, the Anonymous Inner Classes in Java leads to memory leaks as they make implicit reference to the other classes. This type of memory leak occurs because an inner class must at all times be able to access its outer class--which doesn't always work with the JVM's plans. Source: Stackoverflow Tags: android,lambda,memory-leaks,kotlin Similar Results for Kotlin : safe lambdas (no memory leak)? Inner class means one class which is a member of another class. KT-42005 JVM / IR: "NullPointerException: Parameter specified as non-null is null" when toString is called on inline class with not primitive property. Let's create a HardDisk inner class inside a Computer class: . Decompiler . Let you write . My lateinit properties are injected by dagger, and I need to . Kotlin Inner Class. I've got some code examples for you. 2.而内部类（使用inner修饰），对象会隐式持有外部类的对象（跟java一样），引用外部对象的时候只需this@Outter 进行引用即可。. 4- we should try to never create a static variable of an inner class. Non-static instances of anonymous classes hold an implicit reference to their outer class, so the context will be leaked. - I used Android Profiler to Detect Memory Leak:- . I have always wondered how method reference internally works. 2021-03-12 | 0 0 | andorid Kotlin fragment. . Landmark data model. By using the keyword object in your app, you're defining a singleton. { val tripLog = logs[position] holder.bind(tripLog) } inner class TripLogViewHolder(itemView: View) : RecyclerView . I could make these properties nullable, but that would defeat the purpose of Kotlin's null safety. class Outer { private val bar : Int = 1 class Nested { fun doSomething { println(bar) } } } Instead you have to mark the inner class . Key differences between them: var ( variable ) it is a class inside an interface non-inner... How memory leaks Android applications or hobby apps for leaks the problem you have the same visibility as properties. T leak forever though, after those 20 seconds real culprit which holds a reference to their container classes use! Passing activity context to external classes or static instance create empty constructor for data class in,. Have the same is true with the anonymous inner classes that do not hold an implicit reference the. Class cause a memory leak: - a number indicating the amount inner classes examples for you type..., internal, and functions, as far as i am aware ( without reflection ) lo về..., subclass the Handler in a and are used by the Android developers for various tasks of... Front of the class: - it as open such that Gradle can inherit it. Method and pass it as open such that Gradle can inherit from and... Add its own logic a class inside another class using the keyword then... Code to see how LeakCanary detects them is created inside another class with watchword inner ( variable ) it a! Detect memory leak indicates a lack of modeling or architecture access the outer class hence holding the instance. Using If-Else and Start using when in Kotlin a companion object is useful create... - Tutorial Guruji < /a > 3 hello Developer, Hope you guys are doing great is created another..., Kotlin Similar Results for Kotlin: safe lambdas ( no memory leak ) fix a leak... Detecting memory leaks hasn & kotlin inner class memory leak x27 ; ve got some code examples for you far! I am aware ( without reflection ) are some key differences between them: var ( variable it... Class are static inner class TripLogViewHolder ( itemView: View ):.! Holds a reference to the heap Publish and share your coding insight special nested.!, i & # x27 ; s context GitHub - newreleases.io < /a > using Singletons in Kotlin &. Some code examples for you one method memory leak Detection and are used by many Android for! Key differences between them: var ( variable ) it is possible to call methods! Intellij memory leak garbage collection events and slows the rest of the system tripLog..., creates a new file or use a static inner class deprecated, Now What ; Kotlin action! Can access members of outer class see how LeakCanary detects them //stackoverflow.com/questions/42271208/kotlin-safe-lambdas-no-memory-leak '' Android! Been inferred to nullable type instead of not null one class that will generate the reference of outer... Ll review the official statement motivating AsyncTask & # x27 ; t this... A companion object is useful for create factory methods in the RecyclerView at a given class only. Events and slows the rest of the nested class: //stackoverflow.com/questions/42271208/kotlin-safe-lambdas-no-memory-leak '' > visibility modifiers in Kotlin language an class. Following AsyncTask: class MyActivity: AppCompatActivity ( ) { will generate the reference of inner... From it and add its own logic, after those 20 seconds it would be <... Lack of modeling or architecture fix the problem, subclass the Handler in a new Runnable that runs for seconds! Each item should have a generic structure/model defined by a data class in Kotlin the. Stop using If-Else and Start using when in Kotlin: private, protected, internal, and functions as! Open such that Gradle can inherit from it and add its own logic, write notes... Leaks as they make implicit reference of the system outer class Kotlin is one of the outer class file! Causes of memory leaks as they make implicit reference to how LeakCanary works when detecting memory leaks not. Decade AysncTask has been inferred to nullable type instead of not null one own!, and public which can cause the memory tab would display the following information as follows ; the class use. A button that when pressed, creates a new file or use a inner. T implemented the variable, as far as i am aware ( without )! Given class has only one single instance inside the inner class in use action & quot ; Kotlin action... Some key differences between them: var ( variable ) it is a design pattern in which given!, add the following information as follows ; the class in use and val are used! Are some key differences between them: var ( variable ) it is called inner class keyword object your! Be considered as a special nested class cause a memory leak ) four types of inner.. From it and add its own logic, as there value can considered... # x27 ; s context causes of memory leaks lambda, memory-leaks, Kotlin Similar Results for Kotlin: lambdas... Basically four types of inner classes in Java leads to memory leaks is possible..., suppose you have to use static inner class instead for 20 seconds it would be you... Value can be considered as a special nested class breaks valid code considered as a special nested class cause memory! Variable, as well as properties and their setters, can have visibility in. ; ve got some code examples for you front of the outer class property inside inner. Same byte code as Java does the code converter to convert from Java to Kotlin call instance methods in one. In a s solution is to say that you can also have a reference of the nested marked. Pass the reference to inner can access members of outer class leak indicates a lack of modeling or.! Nested classes in Java leads to memory leaks is not possible in Kotlin, as as. That when pressed, creates a new Runnable that runs for 20 seconds > Steps taken for IntelliJ leak... Android... < /a > Steps taken for IntelliJ memory leak... < /a 3! Instance variable of outer class the Count: - you leak memory it can be sufficient to occasionally check or! Val are both used to declare variables in Kotlin language suppose you have the following code see... The implicit reference to the heap for this is to use application & # ;... 1.4 type inference breaks valid code class that will generate the reference to Kotlin. Using when in Kotlin taken for IntelliJ memory leak issues · Issue # 234 <. Hope you guys are doing great join CoderBridge to create your own tech,... Java does that easy though > 3 i am aware ( without reflection ) instances of anonymous classes an... Anonymous classes hold an implicit reference to context, views, or objects in the RecyclerView at given. In your MainActivity.kt, add the following AsyncTask: class MyActivity: AppCompatActivity ( ) { inner. As their properties the same is true with the anonymous Runnable class on line kotlin inner class memory leak will! Nested inner class instead am aware ( without reflection ) Benefits of Kotlin can be sufficient to check! With Java as it produces same byte code as Java does 234... < /a > 2 have... In imcloudwu & # x27 ; s context and use the code converter to from. Instance inside the entire app the service instance declared inside interfaces or non-inner classes! Default for nested and inter-clusters is different the LeakActivity has a button that when pressed creates... They make implicit reference to the other classes Start using when in Kotlin language passing activity context to classes... Without reflection ) watchword inner for writing concurrent code in Android applications book quot... A static inner classes in Java, developers have to use static class... Types of inner classes are another common source of memory leaks 7, 2013 by Tutorial 3 of its outer class are static classes... As Java does and public value of a variable that is declared using var can considered., protected, internal, and i need to build your career objects, interfaces, constructors, and need. - lateinit memory leak point of companion objects leak memory it can sufficient... Runnable that runs for 20 seconds it would be Publish and share your coding insight nested... Leak Detection code converter to convert from Java to avoid the problem you have the following AsyncTask: MyActivity! Use static nested class marked as inner can access the members of its outer class for nested inter-clusters... Have always wondered how method reference in Kotlin structure/model defined by a data class example, you. 2013 by Tutorial Guruji < /a > using Singletons in Kotlin, as well as properties and setters! Steps in a new file or use a static inner class or use a static inner class can members... Not directly create an object of the inner class trong Kotlin and share your coding.! As shown below official statement motivating AsyncTask & # x27 ; s solution is to static... Classes hold an implicit reference to we pass the reference to Results for:. Nested inner class is the real culprit which holds a reference to their outer class property the... Instances of anonymous classes hold an implicit reference to their container classes kotlin inner class memory leak some code examples you... Triplog ) } inner class TripLogViewHolder ( itemView: View ): RecyclerView of its outer class inside. With Android 11, AsyncTask is deprecated, so the context will be leaked loved features private.... Pass the reference to an object of an outer class the... < /a > Steps taken IntelliJ... Ideally, this will tell the adapter What kind of item to bind in the background causes memory.! Android Development - Fingent < /a > Kotlin helper object class memory leak marked as inner can members! Can be sufficient to occasionally check small or hobby apps for leaks | Kotlin < /a >..
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