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Medium.com article source for the tic tac toe game.
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QUESTION
I'm following this tutorial on using MVVM with Retrofit
https://medium.com/@ronkan26/viewmodel-using-retrofit-mvvm-architecture-f759a0291b49
where the user places MutableLiveData inside the Repository class:
...ANSWER
Answered 2021-Mar-23 at 18:00The solution you're looking for depends on how your app is designed. There are several things you can try out:
- Keep your app modularized - as @ADM mentioned split your repository into smaller
- Move live data out of repository - it is unnecessary to keep live data in a repository (in your case singleton) for the entire app lifecycle while there might be only few screens that need different data.
- That's being said - keep your live data in view models - this is the most standard way of doing. You can take a look at this article that explains Retrofit-ViewModel-LiveData repository pattern
- If you end up with complicated screen and many live data objects you can still map entities into screen data representation with events / states /commands (call it as you want) which are pretty well described here. This way you have single
LiveData
and you just have to map your entities.
Additionaly you could use coroutines with retrofit as coroutines are recomended way now for handling background operations and have Kotlin support if you wanted to give it a try.
Also these links might halpe you when exploring different architectures or solutions for handling your problem architecture-components-samples or architecture-samples (mostly using kotlin though).
QUESTION
I'm trying to execute the following tutorial to integrate an Angular 12 application with Keycloak: Keycloak Integration with Angular Frontend (I've checked other similar tutorials and the instructions are the same).
As described in the article, I've inserted the following lines in src\environments\environment.ts
:
ANSWER
Answered 2021-Jun-12 at 08:00the latest library guide does not contain any "credentials" in the configuration. try removing this piece at all, it shouldn't be there
QUESTION
This article mentions:
If your app includes a custom backend server, ID tokens can and should be used to communicate securely with it. Instead of sending requests with a user’s raw uid which can be easily spoofed by a malicious client, send the user's ID token which can be verified via a Firebase Admin SDK (or even a third-party JWT library if Firebase does not have an Admin SDK in your language of choice). To facilitate this, the modern client SDKs provide convenient methods for retrieving ID tokens for the currently logged-in user. The Admin SDK ensures the ID token is valid and returns the decoded token, which includes the uid of the user it belongs to as well as any custom claims added to it.
From learning on Youtube, the raw uid
always seems to be used.
Eg:
...ANSWER
Answered 2021-Jun-13 at 00:45The UID of a user is a unique, constant identifier for that user. So if the same user logs in multiple times, they'll get the same UID.
It makes no sense to use the ID token as the identifier for the user in the database, as an ID token will change every hour.
You should continue to use the UID to identify the user, and only use the ID token when you need to verify the user's identity.
QUESTION
I have got a Spring Boot project with two data sources, one DB2 and one Postgres. I configured that, but have a problem:
The auto-detection for the database type does not work on the DB2 (in any project) unless I specify the database dialect using spring.jpa.database-platform = org.hibernate.dialect.DB2390Dialect
.
But how do I specify that for only one of the database connections? Or how do I specify the other one independently?
Additional info to give you more info on my project structure: I seperated the databases roughly according to this tutorial, although I do not use the ChainedTransactionManager: https://medium.com/preplaced/distributed-transaction-management-for-multiple-databases-with-springboot-jpa-and-hibernate-cde4e1b298e4 I use the same basic project structure and almost unchanged configuration files.
...ANSWER
Answered 2021-Jun-12 at 23:21Ok, I found the answer myself and want to post it for the case that anyone else has the same question.
The answer lies in the config file for each database, i.e. the DB2Config.java file mentioned in the tutorial mentioned in the question.
While I'm at it, I'll inadvertedly also answer the question "how do I manipulate any of the spring.jpa properties for several databases independently".
In the example, the following method gets called:
QUESTION
I am trying to upgrade the NodeJS version my Raspberry Pi model 4 with Raspbian OS installed. I am an absolute beginner to the Raspiberry PI. I followed this article to upgrade the Node version, https://medium.com/@thedyslexiccoder/how-to-update-nodejs-npm-on-a-raspberry-pi-4-da75cad4148c. So I run the following commands in the terminal.
...ANSWER
Answered 2021-Jun-11 at 19:51Nodejs versions are in their own apt repositories, one per version.
You need to do something like this.
QUESTION
Sorry in advance if this seems like a repeat question.
The issue is well-documented: I have a View component. Within that View I have a TouchableOpacity that functions as a submit button. Within the ScrollView I have a TextInput. When the user focuses the TextInput, the keyboard opens. For UX purposes, I believe the user should be able to press the TouchableOpacity and the TouchableOpacity should register the press on the first attempt. This is not the behavior. The first press closes the keyboard, and then the user must press the TouchableOpacity again in order to submit the TextInput:
...ANSWER
Answered 2021-Jun-11 at 18:04As mentioned in the above edit, I'd been poking at this issue here and there for the better part of a month before I finally figured it out. Most of what I read implied that the keyboardShouldPersistTaps prop should go on the component that's the next level up from the TextInput - in my case, the ScrollView component. In my case, this was not true.
In my case, the keyboardShouldPersistTaps prop had to go not on the next higher level component, but rather the highest level component that the user interacts with. For me, this was a SectionList, within each TextInput was rendered.
QUESTION
I am trying to implement an Azure AD B2X in my PowerApps website. So that external users can sign up and create a new account but it doesn't have the "create one" option
Azure Active Directory Sign In without create one
I have been trying to follow this tutorial here by making sure the "Enable guest self-service sign up via user flows" is set to yes, but still I cannot see the "create one" option
I am sure there is wrong setup somewhere. Can someone please help me where else I should look ?
Thank you so much for your help.
Enable guest self-service sign up via user flows
Here is my website
...ANSWER
Answered 2021-Jun-10 at 09:38This is because that you didn't configure the app registration (client id is bd03a7aa-448a-482a-b5ea-f0bcdf056bb6
) under "Applications".
Please add it into the B2X user flow.
QUESTION
I was going through Linear and Logistic regression from ISLR and in both cases I found that one of the approaches adopted to increase the flexibility of the model was to use polynomial features - X and X^2 both as features and then apply the regression models as usual while considering X and X^2 as independent features (in sklearn, not the polynomial fit of statsmodel). Does that not increase the collinearity amongst the features though? How does it affect the model performance?
To summarize my thoughts regarding this -
First, X and X^2 have substantial correlation no doubt.
Second, I wrote a blog demonstrating that, at least in Linear regression, collinearity amongst features does not affect the model fit score though it makes the model less interpretable by increasing coefficient uncertainty.
So does the second point have anything to do with this, given that model performance is measured by the fit score.
...ANSWER
Answered 2021-Jun-10 at 04:30Multi-collinearity isn't always a hindrance. It depends from data to data. If your model isn't giving you the best results(high accuracy or low loss), you then remove the outliers or highly correlated features to improve it but is everything is hunky-dory, you don't bother about them.
Same goes with polynomial regression. Yes it adds multi-collinearity in your model by introducing x^2, x^3 features into your model.
To overcome that, you can use orthogonal polynomial regression
which introduces polynomials that are orthogonal to each other.
But it will still introduce higher degree polynomials which can become unstable at the boundaries of your data space.
To overcome this issue, you can use Regression Splines
in which it divides the distribution of the data into separate portions and fit linear or low degree polynomial functions on each of these portions. The points where the division occurs are called Knots
. Functions which we can use for modelling each piece/bin are known as Piecewise functions
. This function has a constraint , suppose, if it is introducing 3 degree of polynomials or cubic features and then the function should be second-order differentiable.
Such a piecewise polynomial of degree m with m-1 continuous derivatives is called a Spline
.
QUESTION
As per this Medium post, I'm trying to setup a local Next.js development server with HTTPS.
But when I run this command in Windows 10 Powershell:
...ANSWER
Answered 2021-Apr-15 at 11:40The command is for bash so obviously it can't run in PowerShell. There are many changes necessary
- PowerShell currently doesn't support process substitution (which is that
<(command)
part) so you must save the output into file - The escape character in PowerShell is
`
and not\
so you must replace all those escape characters to the correct one
So the result would be something like this
QUESTION
I am considering using the Elsa workflows for a project, but I couldn't find any examples or documentation on how to use it in client applications (xamarin.forms/blazor wasm). My idea idea is to basically define workflows that include also screen transitions in the client apps. Is this a relevant scenario for Elsa, or am not getting it? I understand that there is some REST API available, but no idea how to use it.
This great article explains how to use it in ASP.NET/backend scenarios https://sipkeschoorstra.medium.com/building-workflow-driven-net-core-applications-with-elsa-139523aa4c50
...ANSWER
Answered 2021-Jun-09 at 16:36That's a great use case for Elsa and is something I am planning to create a sample application + guide for. So far, there are guides and samples about executing long-running "back-end" processes using Elsa, but there is now reason one couldn't also use it to implement application navigation logic such as wizards consisting of steps implemented as individual screens for example.
So that's your answer: yes, it is a relevant scenario. But it is unfortunate that there are no concrete samples to point you to at the moment.
Barring any samples, here's how it might work in a client application:
- The client application has Elsa services configured.
- Whether you decide to store workflow within the app (as code or JSON) or on a remote Elsa Server instance doesn't matter - once you have a workflow in memory, you can execute it.
- Since your workflows will be driving UI, you have to think of how tightly-coupled the workflow will be with that UI. For example, a highly tight-coupled workflow might include activities that represent view (names) to present, including transition configuration if that is something to be configured, and outcomes based on what buttons were clicked. A highly loose-coupled workflow on the other hand might act more as a "conductor" or orchestrator of actions and events, where the workflow consists of nothing more than a bunch of primitives such as "SendCommand" and "Event Received", where a "SendCommand" simply raises some application event with a task name that your application then handles. The "Event Received" activity handles the other way around: your application fires instructions to Elsa, and Elsa drives the workflow. A task might be a "Navigate" instruction with the next view name provided as a parameter.
The "SendCommand" and "EventReceived" activities are very new and part of Elsa 2.1 preview packages. Right now they are directly coupled to webhook scenarios (where the commands are sent in the form of HTTP requests to an external application), but the goal is to have various strategies in place (HTTP out requests would just be one of them, another one might be a simple mediator pattern for in-process scenarios such as your client application one).
UPDATETo retrieve workflows designed in the designer into your client app, you need to get the workflow definition via the following API endpoint:
http(s)://your-elsa-server/v1/workflow-definitions/{workflow-definition-id}/Published
What you'll get back is a JSON representing the workflow definition, which you can now deserialize using IContentSerializer.Deserialize
, which will give you a WorkflowDefinition
. But to be able to actually run a workflow, you need a workflow blueprint. To turn the workflow definition into a blueprint, use `IWorkflowBlueprintMaterializer.CreateWorkflowBlueprintAsync(WorkflowDefinition).
Which will give you a blueprint that can then be executed using e.g. IStartsWorkflow.StartWorkflowAsync(IWorkflowBlueprint)
.
There are various other services that make it more convenient to construct and run workflows.
To make this as frictionless as possible for your client app, you could consider simply implementing IWorkflowProvider
, of which we currently have 3 out of the box:
- ProgrammaticWorkflowProvider: provides workflow blueprints based on the workflows coded with the fluent Workflow Builder API.
- DatabaseWorkflowProvider: provides blueprints based on those stored in the database (JSON models stored by the designer).
- StorageWorkflowProvider: provides blueprints based on JSON files stored on some hard drive or blob storage such as Azure Blob Storage.
What you might do, and in fact what I think we should provide out of the box now that you made me think of it, is create a fourth provider that uses the API endpoints to get workflows from.
Then your client app should not have to be bothered with invoking the Elsa API - the provider does it for you.
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