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• Is it possible to listen to relational database update?

  - by Morgan Cheng

  Is it possible to listen to relation database update? For example, my web app want to send data update to client through Comet technology. I can have the program to poll the database periodically, but that would not be performant and scalable. If app can hood to a "event handler" of database, then app can get notification every time given database table data is updated. This sounds more promising, but I didn't find any concrete example for it. This is listener pattern. Does common relational database support such feature?

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• Using Arch Linux computer as a server for Rack Apps

  - by wxl

  What would be the best way to go about using an Arch Linux computer as a Rack (as in Ruby Rack, not an actual rack server) server? Here's what I want to be able to do: Automatically deploy on a git push to the server. (I already have this worked out, on post-receive the server checks out the app to /home/git/app from /home/git/app.git.) Run a Rack server application to serve up this app, one that can be restarted on demand. Run a MongoDB server Be able to access the app by going to my-server.local/app or something similar. (It's really only going to be used on the local network, no port forwarding or outside use) Any ideas would be greatly appreciated. I apologize if this seems too "do it for me".

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• Corrupted network from ipad

  - by lisa

  All wireless clients were kicked off the network (3 PCs & 1 iPad). Only a PC with a wired connection was still able to connect. This morning I discovered that the network had been renamed and a new password had been assigned. Via Linksys Updater I gave a new password. Strangely, in my Windows Control Panel/Network connections our old password now exists as an unsecured network, that I cannot delete! When I attempt to connect using this bastard network, I get an Apple Push error. Linksys WRT610N PCs all using Windows 7 (wired & wireless) iPad 2

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• recommendation for configuration for a multi-core guestOS

  - by reidLinden

  Hi there, I've just received an upgraded Host machine, and am looking to push some of those advances to my workstations Guest OS(s). In particular, I used to have a single processor, with 2 cores, so my guestOS only had 1/1. Now, I've got a single processor with 8 cores, so I'm curious about what would be recommended for my GuestOS now? 1 processor/4 cores? 2 processors/2Cores? 4 processors/1 core? My instinct says to stick with the number of physical processors (or less), but, is that based on reality? I spent a good while looking for an answer to this, but perhaps my google-karma isn't in my favor today. Suggestions?

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• cluster of services and restarting on package upgrade

  - by Marcin Cylke

  I'm using puppet to manage a bunch of servers. Those servers run a simple service - exposed to the world via load balancer. That service's instances are independent in that they can run on their own, are are deployed on multiple servers to increase responsiveness. Now, when I push a new package to repo and puppet catches up with it appearing there it just updates this package on all services. This results in a short downtime of entire service. Is there a way of configuring puppet to do restart the services sequentially? Or using any other kind of strategy?

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• How to install remote software NOT on a domain?

  - by Nicros

  I have a situation where some software (that I wrote) is going to be deployed on 60 laptops for an event. The laptops are all running windows 7, but there is no domain controller, and they will all be connected to a 192.168.x.x network using wifi. Is there any convenient way to push the software (consisting of an msi file) can be pushed out to all the laptops and installed? I looked at WMIC, but I think that requires machines be joined to a domain, as does Group Policy. The other alternative is Powershell, but I have literally 4 hours to do this and will have no time to figure out the right script. It's not the end of the world if it has to be done manually (I can find volunteers) but it would be nicer if it could be automated somehow.

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• Auto-scaling EC2 Servers and Updating Code

  - by jstats

  We've come to the point where we need to set up autoscaling for our web server and I'm unsure how to go about the process of scaling servers and updating the the existing code without remaking a new AMI and changing the autoscale config to use it. I've read a bit about people bundling the new code and uploading it to s3 and having new servers grab the bundle on boot up but that doesn't seem all that pleasant either. Currently the web app's files live in a git repo, and when we update the code, we push it to github, ssh into the web app and run a hook to bring down the latest code. So I was thinking that another option could be to just run that hook on an hourly or daily cron task. Unfortunately that doesn't cover everything type of update (for example new blog posts' images and such which aren't included in the git repo) but it's something. Could anyone provide some advice on what a common solution is or anything as to why my proposed solution is a bad idea? Thanks all

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• How to use Delegate in C# for Dictionary<int, List<string>>

  - by Emanuel

  The code: private delegate void ThreadStatusCallback(ReceiveMessageAction action, Dictionary<int, List<string>> message); ... Dictionary<int, List<string>> messagesForNotification = new Dictionary<int, List<string>>(); ... Invoke(new ThreadStatusCallback(ReceivesMessagesStatus), ReceiveMessageAction.Notification , messagesForNotification ); ... private void ReceivesMessagesStatus(ReceiveMessageAction action, object value) { ... } How can I send the two variable of type ReceiveMessageAction respectively Dictionary<int, List<string>> to the ReceivesMessagesStatus method. Thanks.

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• How send html mail using linux command line

  - by Diesel Draft

  Hi, I need send mail with html format. I have only linux comand line and command "mail". Currently have used: echo "To: [email protected]" > /var/www/report.csv echo "Subject: Subject" >> /var/www/report.csv echo "Content-Type: text/html; charset=\"us-ascii\"" >> /var/www/report.csv echo "<html>" >> /var/www/report.csv mysql -u ***** -p***** -H -e "select * from users LIMIT 20" dev >> /var/www/report.csv echo "</html>" >> /var/www/report.csv mail -s "Built notification" [email protected] < /var/www/report.csv But in my mail-agent i get only plain/text.

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• What can impact the throughput rate at tcp or Os level?

  - by Jimm

  I am facing a problem, where running the same application on different servers, yields unexpected performance results. For example, running the application on a particular faster server (faster cpu, more memory), with no load, yields slower performance than running on a less powerful server on the same network. I am suspecting that either OS or TCP is causing the slowness on the faster server. I cannot use IPerf , unless i modify it, because the "performance" in my application is defined as Component A sends a message to Component B. Component B sends an ACK to component A and ONLY then Component A would send the next message. So it is different from what IPerf does, which to my knowledge, simply tries to push as many messages as possible. Is there a tool that can look at OS and TCP configuration and suggest the cause of slowness?

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• Facebook Open Graph without a browser

  - by Hellnar

  Hello, For a middleware system with internet (which works inside a set-top box) I want to develop a primitive Facebook interface where users can type their user-names and password, showing their latest notification, messages and other casual stuff on the TV screen by using the recent Facebook Graph API. This middleware program uses Java ME to run programs (such as this simple facebook app) and it can connect to internet however it doesn't have a real web browser. Without browser it can connect to any url to retrieve the JSON response however I am not sure how to achieve authentication without a real browser. Under this circumstances, is it possible Facebook authentication? If you think so, what approach would you suggest ? Thanks

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• i have project code in cocos and cocos2d and have problem in orientation

  - by Sukhi

  i have project code in cocos and cocos2d and have problem in orientation . my game is in landscape mode part of its code in cocos2d and another one is in cocos . cocos2d views orientations is working fine . i put this code in appdelegate.m file -(void)orientationChanged:(NSNotification *)notification { UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation]; if( orientation == UIInterfaceOrientationLandscapeLeft) { [[CCDirector sharedDirector] setDeviceOrientation: kCCDeviceOrientationLandscapeRight]; } else if( orientation == UIInterfaceOrientationLandscapeRight) { [[CCDirector sharedDirector] setDeviceOrientation: kCCDeviceOrientationLandscapeLeft]; } } but when i go to cocos code its view look good but as soon as i change the rotation LandscapeRight to LandscapeLeft my views goes in potrate mode i wrote following code in UIViewController (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Overriden to allow any orientation. BOOL orienationStatus=FALSE; if (interfaceOrientation ==UIInterfaceOrientationLandscapeLeft || interfaceOrientation==UIInterfaceOrientationLandscapeRight) { orienationStatus=TRUE; } return orienationStatus; } whats wrong in that i don't know .... help will be appreciated .....

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• iPhone - Launching selectors from a different class

  - by David Schiefer

  Hi, I'd like to reload a table view which is in another class called "WriteIt_MobileAppDelegate" from one of my other classes which is called "Properties". I've tried to do this via the NSNotificationCenter class - the log gets called but the table is never updated. Properties.h: [[NSNotificationCenter defaultCenter] postNotificationName:@"NameChanged" object:[WriteIt_MobileAppDelegate class] userInfo:nil]; WriteIt_MobileAppDelegate.m -(void)awakeFromNib { [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reloadItProperties:) name:@"NameChanged" object:self]; } - (void) reloadItProperties: (NSNotification *)notification { NSLog(@"Reloading Data"); //this gets called [self.navigationController popToRootViewControllerAnimated:YES]; [self.tblSimpleTable reloadData]; [self.tblSimpleTable reloadSectionIndexTitles]; // but the rest doesn't } What am I doing wrong here?

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• How to call another class's method from my app delegate

  - by Jared

  I have an application that utilizes UILocalNotifications to pop-up UIAlertViews. When the notification fires, the user chooses to go into the app, and this method is called from my app delegate: - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {...} Where I can handle it and where I also prompt another alertview for more information. So when the app launches, it is displaying view A, and then the alertview pops up and prompts for input. This alertview, however, is originating from my app delegate. I need to be able to reload view A when the user hits Yes/No on the alertview. How can I do that from within my app delegate? Any help is appreciated!!

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• No display but video card fans spins

  - by Marc

  Since I moved my computer there's no display when I plug my screen in the video card but works fine in the mother board. I tried reseting the cmos, but I still have the same problem. The fans are spining and there's a light from the card. I tried the DVI ports and the HDMI Here's my build. I have it for 2 months and everything was working fine. Do you think it's the video card? Asus p8z68-v pro gen3 Intel i7 2600k 120 GB OCZ Agility 3 16 GB RAM Blue Corsair DDR3 Asus GTX 570 H80 Corsair liquid cooling XFX PRO750W 80Plus bronze power supply EDIT That's why And I can't push more cause the card is on this Thank you everyone! I fixed it by pushing the mobo from the other side of the case and now it fits.

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• Why is the pavucontrol level indicator jumping while nothing plays?

  - by EnterTheLiquidToasterFamily

  The level indicator in the screenshot does jump around even if nothing is playing. The indicator also reasonably represents sound levels when music is playing. I dont have any mediaservers running or noisy browsertabs open. Also no mic connected. When I turn the volume to max in software and on the amp, there is no noise from the speakers at all. Played music is loud and not distorted. Hardware: Realtek ALC889 over optical audio connector to a generic amp. Software: Debian Wheezy with latest backport kernel 3.14 (same thing on wheezy 3.2 stock), wheezy pulseaudio, xfce session, a custom asound.conf that enables pulseaudio to push sound over optical port. /etc/asound.conf pcm.a52 { @args [CARD] @args.CARD { type string } type rate slave { pcm { type a52 bitrate 448 channels 6 card $CARD } rate 48000 #required somehow, otherwise nothing happens in PulseAudio } }

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• How to change mime type of email notifications sent by PeopleSoft?

  - by skanjo

  I work near some PeopleSoft guys and they asked how to change a link in an email notification sent by PeopleSoft so that it is friendly, basically they just wanted the use of an HTML anchor. After sitting down with them and looking through the code I found that the default mime type for all email notifications is text/plain and there does not seem to be any kind of an email API that is called which would allow setting the mime type of the body to text/html. Furthermore, there seems to be no general email configuration in PeopleSoft to, for example, set the default mime type for all emails. Do you know how to change the mime type of an email in PeopleSoft?

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• Automatically reboot Windows8 if no internet activity [migrated]

  - by Patrick

  I have a media server located in a very inconvenient part of my house. Occasionally I will have to reset my router or it will reset itself. The issue is the PC loses connectivity for some reason, and I am forced to walk outside, around the house, into the basement, over a bunch of toys and weights and boxes, to push a button to reboot it. I would love to have it check itself every 5-10 minutes and auto reboot if it is unable to ping a given address/IP. Any ideas how to accomplish this?

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• How to connect to the process

  - by Polaris

  I have WPF Application. My Application consist of 2 exe files: Notifier.exe and MainApp.exe. Notifier is system tray popup application which check the remote server in equal intervals and get the list of current documents of user. When user click on one of the documents in list in Notification popup I open MainApp.exe and show required document in new tab. But When user click on another document in list it open new MainApp.exe process. Question: How Can I connect specific (already opened) process in the operating system and create some object in it?

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• Apache user owns git project root, with git-http-backend setup, but still having permissions problems

  - by Luke

  I've setup git-http-backend on my vps server (CentOS), under one of its users. The apache user owns the git project root directory - /home/theuser/git/, as below: drwxrwxr-x 3 apache apache The apache user also owns everything inside that directory. But I'm still getting the following error in git when trying to push: error: unpack failed: unpack-objects abnormal exit The apache error log shows the following error: error: insufficient permission for adding an object to repository database ./objects I've tried every combination of user permissions and enabled read/write access, but not getting anywhere. Should the git user own this folder? Can someone explain exactly what user should own this folder, or what steps I might take to fix this problem?

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• How to make Outlook Calendar reminders stay on top in Windows 7

  - by thursdaysgeek

  I'm just starting to use Windows 7 and I want to know how to make my Outlook reminders pop up and show themselves. They keep opening discretely, quietly as just another Outlook entry on the taskbar. And I keep overlooking them, because they pop up behind everything else. How do I make them less easy to overlook? (Yeah, usually you don't want obnoxious apps that push themselves to the forefront. But there are a few places where I do want that, and Outlook calendar reminders are one of them.)

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• what's POST code 18 / can I run an ASRock P55 Pro + Core i3 530?

  - by Michael Borgwardt

  When I switch my newly built PC on, the fans start up, but I get nothing on the monitor, and the POST display on the motherboard runs quickly through various codes and then stops at code 18, which does not appear in the manual (the list there seems identical to this one). This lasts about 10 seconds, after which the machine shuts down. After a pause (also about 10 seconds) it starts up again, and this repeats until I cut the power. Interestingly, when I push the reset button, it stops at POST code 16 (which is also not listed in the manual). Does anyone have information about the meaning of those codes? Motherboard: ASRock P55 Pro CPU: Intel Core i3 530 Graphics Card: Sapphire HHD 5750 Does anyone have experience with that Motherboard/CPU combination? It says on the packaging and in the manual that it's only compatible with Core i5 and i7 (no mention of i3), but on the maker's product page, the i3 is listed as compatible as well.

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• is Boost Library's weighted median broken?

  - by user624188

  I confess that I am no expert in C++. I am looking for a fast way to compute weighted median, which Boost seemed to have. But it seems I am not able to make it work. #include <iostream> #include <boost/accumulators/accumulators.hpp> #include <boost/accumulators/statistics/stats.hpp> #include <boost/accumulators/statistics/median.hpp> #include <boost/accumulators/statistics/weighted_median.hpp> using namespace boost::accumulators; int main() { // Define an accumulator set accumulator_set<double, stats<tag::median > > acc1; accumulator_set<double, stats<tag::median >, float> acc2; // push in some data ... acc1(0.1); acc1(0.2); acc1(0.3); acc1(0.4); acc1(0.5); acc1(0.6); acc2(0.1, weight=0.); acc2(0.2, weight=0.); acc2(0.3, weight=0.); acc2(0.4, weight=1.); acc2(0.5, weight=1.); acc2(0.6, weight=1.); // Display the results ... std::cout << " Median: " << median(acc1) << std::endl; std::cout << "Weighted Median: " << median(acc2) << std::endl; return 0; } produces the following output, which is clearly wrong. Median: 0.3 Weighted Median: 0.3 Am I doing something wrong? Any help will be greatly appreciated. * however, the weighted sum works correctly * @glowcoder: The weighted sum works perfectly fine like this. #include <iostream> #include <boost/accumulators/accumulators.hpp> #include <boost/accumulators/statistics/stats.hpp> #include <boost/accumulators/statistics/sum.hpp> #include <boost/accumulators/statistics/weighted_sum.hpp> using namespace boost::accumulators; int main() { // Define an accumulator set accumulator_set<double, stats<tag::sum > > acc1; accumulator_set<double, stats<tag::sum >, float> acc2; // accumulator_set<double, stats<tag::median >, float> acc2; // push in some data ... acc1(0.1); acc1(0.2); acc1(0.3); acc1(0.4); acc1(0.5); acc1(0.6); acc2(0.1, weight=0.); acc2(0.2, weight=0.); acc2(0.3, weight=0.); acc2(0.4, weight=1.); acc2(0.5, weight=1.); acc2(0.6, weight=1.); // Display the results ... std::cout << " Median: " << sum(acc1) << std::endl; std::cout << "Weighted Median: " << sum(acc2) << std::endl; return 0; } and the result is Sum: 2.1 Weighted Sum: 1.5

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• How to use SOAP in asp.net mvc

  - by bastijn

  A 3rd party site sends its notifications after my web application has completed some action in order to notify me of its succes. Receiving a notification item requires a response back to the 3rd party server (URL) with the a containing the value "accepted". I have never user SOAP and with the basic info found I'm a bit lost for the case of asp.net mvc. Are there any good links showing the principle of receiving and sending SOAP responses? Tutorials / information may be presented in other languages such as java, asp.net (classic) or something. I need to get a general idea since googling on SOAP is not giving me anything for the past few hours. thanks in advance.

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• How to manage configuration software installations of non-domain Windows XP machines?

  - by Digi

  I have a large set of unattended Windows XP machines who are not connected to a domain or even to each other. I am struggling to find any tools out there that I can use to deal with them in one application. I am hoping to find software that I can perhaps install a client on each machine, then have it essentially proxy out configuration information and possibly commands (install, uninstall, stop service, etc) across the whole network. The closest I've come is Nagios and its client, but it cannot be used to push files through and run commands remotely. Any suggestions?

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