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Copy custom us state

hi and welcome to this new video where i will show you why when you implement a custom state store you have to use the copy of unsafe row to start let's see the reason or for for this video so the state store api definition where as you can see in the put method the scala dock recommends to use the copy of the unsafe row because it can be reused and generally also because as a row by definition is a mutable object so to show you why you should do that if you think about storing the unsafe row inside your stay store implementation i will use this sample snippet at the beginning i will def i'm defining here two different lists buffers and in the first one i will store the unsafe rows objects that are not copied in the second list i will store the bytes of of these of these unseveral objects in form of a string just to show you that if you don't want to store the answer row in the state store you don't have to worry about the calling the copy method so what will happen here is that at the beginning i will create a first unsafe row that will store the number one two three and i will call the point two method of the answer flow class later i will try create the second by answer row here i mean the value so i will try to create a second value that will be stored in the same unsafe row and since ncfro is a mutable object this new value will overwrite the previous one and generally i will just run this code and show you what is the content of both lists and as you can see the fierce list the fierce list which stores the bytes so this these two numbers contains two different values whereas the second element the second list which stores the unsafe row which is not copied contains the same elements as you can see just here and in this specific case it's the last element added to the list so let's see now what happens if we use the recommended copy from the stage store documentation and as you can see it worked as expected because now you can find in the in both lists the same values and generally is the main reason of using the copy if you want to store it in your state store definition it was barterskinned informatica for god.com thanks for watching