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I am building a mobile app using Flutter. All user's data is stored online in a MySQL database, so the app needs an internet connection for almost every user interaction (there is a backend REST API).
Users have to be able to create some lists of tasks, update and delete every task and list, and so on. But from the user's perspective, the need for an internet connection for every simple operation like adding or deleting a task is a bad experience. I need a way to support these operations even without connection with the backend and to apply these changes later when it is possible. But what is the best practice to handle this case?
How to keep the app behaving like normal even without an internet connection and sync all changes that the user has done with the backend when the internet is available again?
For example, if the user creates a new list the app expects to receive the new list's object (with id) from the backend. Later this id is used for every backend call about this list like adding a task in it.
What you can do is use a state management approaches like
Providers, Bloc etc and have a local state of your database or the needed list inside them and apply all the changes on them when offline and implement all these on to the server when connected to internet.
Read here about flutter state Management
also you can check when the device is connected to internet with this connectivity and data_connection_checker packages
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I am trying to simulate a call center with chatting and in this scenario, a customer service representative can serve multiple customer chats at the same time, depending on their capabilities
I started nby creating an Employee agent and build on this, but I could not simulate a scenario in which one “Employee agent” can serve several client “chat” agents at the same time based on their total capacity, as in a real chat call center ...
Please advise how I can configure the logic so that several agents can capture / delay one resource. Or create a block in which the employee agent will bypass each chat and check if he can release it.
Thanks in advance
This is a more advanced question and not that easy to answer in detail without building a lot of logic and functionality.
Overall I can suggest the following design, but depending on your level of expertise in AnyLogic (And Java) this might not be the best design and I am curious to see if anyone will venture any other options. But as for a moderate user (and use case), this design will be sufficient
Since there is no way to do what you asked with a standard resource pool I would suggest to setup a resource pool inside a new agent type and then either as a population or graphically (as per my design) you can send chats to these agents. Since each agent has a resource pools inside of them you can define the number of chats an agent can handle in the parameters of the agent which defines the resources in the resource pool
You can then have a function that takes a chat from the queue and gives it to the first available agent that has capacity.
And you call this function whenever something arrives in the queue as well as when something leaves a chat agent and also when a agent gets a new chat as multiple chats might arrive at the same time and we only send the first one.
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I hope you're well, I need some orientation since I'm new to using the Cloud Messaging service of the Firebase suite.
Here I have 2 applications, myapp_client and myapp_admin. What happens is the following, with myapp_admin I publish information that I insert in the Firestore database and with myapp_client I read this information inserted in the Firestore database.
What I want is that once the myapp_admin application publishes this information then it sends a notification to the users of the myapp_client application who can then open it.
I've done some research and I haven't found a good documentation (even the official one) that would explain how to send notifications programmatically from the dart/flutter code without using Cloud functions (This is possible)?
Can you please guide me? I'm not asking you to give me solutions but to guide me to find the solutions I need to implement such an operation.
THANKS
What you are describing will certainly require you to listen for new snapshots from a collection of notifications in Firestore in a background process of myapp_client, and then trigger a local notification when new data is received by using a plugin like flutter_local_notifications. Here is a helpful article explaining how code execution in the background can be done in Flutter.
If you want the myapp_client app to receive the data published by myapp_admin as push notifications even when your app is in the background without executing code in the background, the only viable and tested solution that works really well with Flutter AFAIK, is using Cloud functions.
The description by Nikolai using the local notification package together with client subscriptions is a fine solution.
Out of curiosity, why do you want to avoid cloud functions?
Using CF is a quite straightforward way to do it.
admin write information to firestore
cloud function triggers with the onWrite function on collection/doc that match where your admin wrote the data.
cloud function use FCM to send push notification to a topic that your clients subscribe to, or to individual devices.
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My situation is that I am building an app (in swift) that pulls data from an API & displays them in a tableview (say for example up to 500 cells). The problem occurs with the API. It is limited to 200 calls/day and 6k/month, and one request is equal to 100 pieces of data, so to display 500 cells it would cost 5 call credits.
I am stuck on how to efficiently use this API. Currently, each time the user refreshes the tableview it will cost 5 credits. Therefore after this has been done 40 times, the API cap has been reached for the day.
The only solution I have though of is to have some script in js/ruby/python that pulls the data every x minutes or x hours and saves this to Firebase databse or firebase Cloud storage and then in my app I can pull the data from Firebase?
My other idea was to run the script on a server and pull the data from there.
Is there any other simpler alternatives that I am missing?
To prevent over consuming why not you run the API and save the results to your own DB; create a custom API specific for your app to pull from your personal storage and this way you can control the interval and frequency of how often you pull on the premium API.
You can setup a job to auto update your personal DB with the premium data every x amount of time, update new entries and add new ones as you see fit while on the client side they will pull the same premium data you’ve pulled; imo that would be how I would go about because without control you’ll find yourself facing a major scaling issue.
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In Meteor, what is the most efficient way to check the database to see if something exists while the user is typing?
For example, I'm trying to check if the username exists in database while the user is typing his/her desired name to register an account.
I could create a keydown event to check every time when there's a key stroke, or I could use setInterval, but I feel like that's an overkill.
Is there a built in method in Meteor to do something like this?
I did't see anything like that, so you'll have to built it yourself.
Security
Showing which usernames are taken while typing makes it very easy to retrieve a list of existing users. This could be okay if the user list is available to public anyway (for example in a forum), but in most applications you should avoid that.
Waiting until user stops typing
Users probably type faster than the service is able to check the database. Therefore checking on every key stroke would cause a lot of unnecessary service calls. You should at least implement a delay or wait until the field looses focus.
Forseeing next character
You should try to minimize service calls. For example if someone types "Mic", besides checking the exact name, you could add that "Mick" and "Mic1" are already taken too. Further optimization would be to predict more than one character based on common names, but that probably will never be needed.
Reusing Autocomplete Code
You could reuse some code of a autocomplete component, for example when to trigger a service call. But most of the code you can't reuse, because the user interface is very different.
You might find this smart package useful.
https://github.com/mizzao/meteor-autocomplete
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I want to implement a simple in-house table that tracks user page views on my website. Without targeting some specific hypothesis, what is useful data to store? Eventually I'll use it to build graphs or decision trees to better learn about our user base. This is static (no javascript).
Things I can think of:
URL accessed
HTTP refer[r]er
HTTP Accept Language
Browser-agent
Session id
User id (if logged in)
Time visited
It depends on how public your site is. If your site requires authentication you can have more controlled statistics because you can trace the user (visitors) history. In the case the user does not require authentication you are limited to the information provided by the SERVER VARIABLES: HTTP_USER_AGENT; REMOTE_USER; REMOTE_ADDR; REMOTE_HOST; REMOTE_PORT; HTTP_COOKIE; HTTP_USER_AGENT.
I have implemented something like this for some non-public site each time the user logs on to the site, the information I'm storing looks like:
User Key
Remote host IP
Date Logon
Last Request Datetime
Total time connected (minutes)
Last Request Minutes
Event/Action performed
Sounds like a good start,
I'd be inclined to store visitor IP address, and derived from that via a geo ip lookup the location of the visitor.
Also you could consider reverse dns'ing the IP to get an idea of the isp you're user is on, you might never use it but then again it could be useful if you have a report of downstream caching causing problems.