We've got a program that runs on our network (it's published to our app-server and run from there as well) and I'd like to show an Alert window (by DevExpress) to all users who are running the app, whenever a new item is entered. Obviously the code would go in the Save event but when I put it in there, it only works for me, meaning I'm the only user who sees the alert, no one else. The same can be said for other users...they only see the alert when they enter it, not when someone else enters it.
Any ideas as to how this can be accomplished?
You can use straight MSMQ to put on a message and have clients listen on that queue. You can also use NServiceBus (which does use MSMQ) that has a publish subscribe framework built in. This way your clients can subscribe to all clients or certain clients.
Since WinXP, Vista and Win7 have MSMQ it just maybe a matter of installation and configuration (which NServiceBus will do 'automatically' for you)
You could try with Comet if you want true push mechanism. Otherwise you could use periodical pull using setInterval and ajax calls. However, both techniques have some performance repercussions.
Related
I'm studying React Native right now, and I'm trying to figure out how to enable the reception of Push Notifications even when the app is closed, just as Facebook does.
I'm a web developer, so I'm not used to mobile apps' "Manifest" logic. Where should I start from?
Thank you!
It seems that since you are a web developer, mobile app is not yet familiar with you. Actually, setting up push notification will require a few more official steps (differently on iOS and Android), and after everything is set, the push notification will happen between Apple server (or Google server) and smartphone's OS (which is iOS or Android), so the push notifications will come to the phone no matter what (without knowing/caring your app is opened or closed ^^)
In the programming code of our app, we can do our logics when the notifications come based on 2 cases: users is using the app or app is not running (not running means users are not using your app, and it is either staying awake in the background or users have exited it completely - e.g. pressing Home button twice on iPhone, and swiping the app away)
Actually, If you want your app to stay awake in the background, you can add some settings to the "manifest"-like files (of course differently on iOS & Android). However, my experiences taught me that keeping the app awake will encourage the users to complain and delete our app (my previous app's user once complained about his iPhone's battery was consumed greatly because of my app ^^)
If you really want to keep your app awake, you can set it in the settings, then in the push notifications' data, you can include extra parameters, and finally in the function of receiving push-notifications in your app, you can do anything with those parameters!
In short, you may just need to config push-notification properly for your app, and Apple/Google will do the rest, either your app is running in background or totally closed, it will receive the notifications. Hope you can find a good solution based on my explanation. If there's still something unclear, feel free to post here some more details on your needs, thanks!
This is the library I'm using with my previous react-native project: (they also have tutorial there ^^)
https://github.com/zo0r/react-native-push-notification
ADDED EXPLANATION: (based on author's needs):
The goal is: the user will register/login in the app, and will subscribe to some future events.
=> whenever users open the app, data will be sent to Apple/Google server to get a token, and you will use this token together with user's subscribe data to send all to your own push-server (you can use PHP or node.js server or whatever)
When an event gets updated a notif. should be sent to all the users who are going to that event. So a notif. aimed to certain users only.
=> like the above answer, data will be sent every time users open app (or change settings, you can do it in your logic of the app, because data will be kept your own push-server, which means on that server, you can even see user list, and can aim to certain users - it depends on what data will be sent to the users from the smartphone, but users may refuse inputting too much information like name, age or email, but it's up to your service's need ^^)
By clicking on it, the app will open and a certain page of the app (pre-existing) will be shown.
=> by default, when an notif. is clicked, the app will be opened for sure, and here once again, you can add extra parameters to the notifications (which is the landing page you need, then in the function of you app, just go there - but it may get extra logics for this. Besides, when to push notification, and which data should be pushed etc. will be controlled by your own server)
It seems like the most complicated part will be the "sending to certain users" one!
=> I explained this already, but you're right, actually it's complicated, because you need to create your own server with lots of API and logics based on your needs, and it need a few more steps (complicated one because you need to register many things with Apple & Google, then adding their Certificates into your own server etc.)
Hopefully you will achieve it, I suggest you play around and truly understand how push-notifications work first (for both sides - your own server and your application) - Good luck, though ^^
I am developing an application and decided Nagios3 for performing monitoring stuff. But I am stuck at two points. I am using check_http plug-in for monitoring load on my service api. Now I want to perform below tasks.
I need to set a threshold in check_http for performing some task after crossing that threshold. I tried below command
'check_command check_nrpe_1arg!check_service_api'
but it only tells me the load, not any threshold is set. while below one doesn't work.
'check_command check_service_api!100!200'
I need to send simple text message on some port(my application).
I am new to Nagios, so please help me figuring out the solution except email notification stuff.
There is a check command that you can download called "notify_sms" that integrates with an API server hosted by a company called Esendex. They charge for their service but it works well.
I'm dabbling with using PubNub for various parts of my app. I'm using their AngularJS library for this.
Right now, I'm just testing it for doing "analytics". Basically, I want to track ever more a user makes in the app - buttons pressed, states navigated to, etc. So, I track actions and publish on a channel.
It all works great - when the user is online. However, when offline, I lose all this tracking. I was sort of hoping that PubNub client would automatically queue all the publish requests. It does not seem to do this.
So, I'm thinking I'll have a service to collect all publish requests and put them in a queue if the device is offline. Once the device is back online, I'll publish any queued requests.
Is this the best approach? Does anyone have a better suggestion? Does PubNub already have this ability and I'm just not finding it?
Yes, currently, this is the best way to achieve this.
There are different scenarios for queuing / retrying, for example -- depending on the content of the message (eg expiration/timeliness of the message), and depending on the reason (no internet, channel permissions) you may want to re-queue/retry some and not others, etc.
So if you can implement your own retry logic custom to your use case, thats ideal. We may provide more productized options on this moving forward...
geremy
I have built a controller that is uses the media view to stream videos to users. When someone accesses the controller from an iOS device, the user agent being sent is not matching and the session logs out.
I am using the iPad plugin for Flow Player and I have seen other posts about flash not sending the correct user agent strings, so instead of messing with that, I'd like to disable Session.checkAgent for that specific action. I have tried adding it to beforeFilter(), but the check clearly happens before that point.
Is there some other method I can override to implement this?
I haven't tested it, but if you know (part of) the URL, you can check the $_GET['url'] inside your app/Config/core.php and modify the session configuration based upon its value, For example, $_GET['url'] starts with '/videos/view'.
You need to do this inside the configuration file, otherwise the session is already started as you already discovered.
Note that $_GET['url'] is only used in older versions of CakePHP. For newer versions of CakePHP, you may need to user $_SERVER['REQUEST_URI'] or another $_SERVER environment variable.
I have one very weird question.
There are 2 Silverlight Client
1. Admin
2. User
Now, I want a scenario wherein the Admin Silverlight can initiate a function call on the User Silverlight.
Pretty much a newbie with SL so wonder if that would be possible.
I'd appreciate any help.
Thanks
I suppose the applications are not in the same browser / machine, and when you describe the usage pattern as admin and user, I take that there are probably more users than admins.
You might want to take a look at duplex bindings for WCF services - this is a web service binding that allows pushing notifications to clients from the server. When all clients establish such a channel, you can implement hub-and-spoke communication between clients.
This blog post gives a good receipt for getting started:
http://silverlightforbusiness.net/2009/06/23/pushing-data-from-the-server-to-silverlight-3-using-a-duplex-wcf-service/
If they are both in the same frame/browser, you could call JavaScript in the first using the HtmlPage API, which could interact with the second.
So:
Silverlight control -> injects JS into HtmlPage -> JS interacts with Silverlight control 2 (assuming this is possible, please correct me if wrong) -> Silverlight control responds.
If they are in separate windows or running "out of browser", I would expect it wouldn't work.
If the 2 instances are seperated (i.e., the admin is on one machine and the user is on another) there's no direct way to do it. However, you can rig it up with a publisher/subscriber style system.
Assumption: You have some sort of shared data store between the two, maybe a database or something.
Idea: You have the admin client write a request to this shared data store; an entry in a table, or a new file in a network share, or something. You have the user client app regularly scan this table/share for new entries, say every .5 seconds or so. When it sees the entry, it executes the requested operation, storing any return values back to the shared store. When the admin sees the return value, he knows the operation has been successfully executed.
There are a couple of options that I can think of.
You could implement some sort of remote procedure call via web services whereby one Silverlight app posts a request to call the method, and the other Silverlight regularly checks for method call requests.
If hosted on the same HTML page in a browser, you could use javascript to allow the two controls to interact.
However, direct communication between two Silverlight instances isn't supported, and while the suggestions may help to achieve something close to what you want, they don't provide a complete solution that will work in all scenarios.