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How to test whether an image is already in cache? [migrated]

- by Evik James

I am developing a web site that has a lot of large, high-quality images on the home page. On the home page, there is an image carousel that pulls ten high quality images from a database. The images can be 1 meg each. The carousel images aren't my problem (right now), but it has something to do with it. The problem I am trying to address right now is that I use a high quality background image that I want to continue using, it's about 180k. If I have the background in cache on the home page, I want to use it. If not, then I don't want to use it on the home page. I'll load it from a different page. When the user returns to the home page, and the background image is in cache, I want to use it. Can I test whether an image is already in cache and if so, dynamically load or NOT load based on that? You can see the home page here: http://flyingpiston2012-com.securec37.ezhostingserver.com/

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How to fundamentally approach creating a 'financial planner' application?

- by Anonymous -

I want to create a financial planning application (for personal use), for which the overall functionality will be this: User (me..) can create different 'scenarios'. Each scenario is configured with different incomings/outgoings. Scenarios can be 'explored' in a calendar format with projections taking into account tax, interest (on both debt and savings) and so on and so forth. My problem lies in how to fundamentally approach the project. I've considered: When creating incomings/outgoings for a script to apply them to each day in a 'days' table of a database, acting as a method of caching. This means that if I wanted to look at January 14th, 2074 there aren't thousands of cycles of calculations to run through and the result can just be pulled. Do each calculation dynamically, but again, I'm finding it hard to visuallize how I would handle different tax allowances (I'm based in the UK by the way), payrises and 'changes' to my incomings/outgoings. I've sat on this for a couple of days and am struggling to come up with an elegant approach to my problem. There may well be software out there that does what I'm looking to do (in fact I'm sure it is) but I would like to develop this myself for learning purposes, to be able to add it to my personal life 'toolset' and to allow me to expand on it in the future. Many thanks to all who have any input on my dilemna.

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Blog Rebranding

I have been spending more and more time on learning as much as I can on Agile Development and also have been fairly immersed in rolling out TFS 2010 in our environment. I feel like it is time to talk about some of my experiences. With that, I am rebranding my blog to focus on these topics. I am going to start with a bunch of blogs on the process I have gone through getting TFS 2010 configured for our development teams. Last week, Brian Harry was in our office and gave a great talk on the improved tools in TFS 2010 and how Microsoft uses the tools internally. I followed that up with a high-level overview of the improved out of the box process templates and the process to customize them. I am definitely very excited about the new features in 2010 and hopefully will keep up my motivation to blog about it. I am writing my first post right now about the process I went through to build a task progress report based on the user story progress report in the MSF for Agile Development template. Stay tunedDid you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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Mahout - Clustering - "naming" the cluster elements

- by Mark Bramnik

I'm doing some research and I'm playing with Apache Mahout 0.6 My purpose is to build a system which will name different categories of documents based on user input. The documents are not known in advance and I don't know also which categories do I have while collecting these documents. But I do know, that all the documents in the model should belong to one of the predefined categories. For example: Lets say I've collected a N documents, that belong to 3 different groups : Politics Madonna (pop-star) Science fiction I don't know what document belongs to what category, but I know that each one of my N documents belongs to one of those categories (e.g. there are no documents about, say basketball among these N docs) So, I came up with the following idea: Apply mahout clustering (for example k-mean with k=3 on these documents) This should divide the N documents to 3 groups. This should be kind of my model to learn with. I still don't know which document really belongs to which group, but at least the documents are clustered now by group Ask the user to find any document in the web that should be about 'Madonna' (I can't show to the user none of my N documents, its a restriction). Then I want to measure 'similarity' of this document and each one of 3 groups. I expect to see that the measurement for similarity between user_doc and documents in Madonna group in the model will be higher than the similarity between the user_doc and documents about politics. I've managed to produce the cluster of documents using 'Mahout in Action' book. But I don't understand how should I use Mahout to measure similarity between the 'ready' cluster group of document and one given document. I thought about rerunning the cluster with k=3 for N+1 documents with the same centroids (in terms of k-mean clustering) and see whether where the new document falls, but maybe there is any other way to do that? Is it possible to do with Mahout or my idea is conceptually wrong? (example in terms of Mahout API would be really good) Thanks a lot and sorry for a long question (couldn't describe it better) Any help is highly appreciated P.S. This is not a home-work project :)

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EXT4 external hard drive for use with multiple systems

- by EXTdumb

I recently bought a external hard drive to store some data on. I use Linux but I am not a power user. If I format the drive to EXT4, is it possible for the permissions to ever screw up and I lost access to my data? I will be plugging the drive into several different linux based computers at work and I frequently hop distros on my main home machine. I need to make sure I don't lose any data because I overlooked something. I am not familiar with EXT 3 or 4. So far I have done this : Formatted drive to EXT4 ran gksudo thunar and changed the permissions to my user account and all settings to read/write Wrote all the files I need to the drive I really appreciate any help.

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Throttling bandwidth on a per group basis

- by Robreylen

I am wondering if it is possible to create a bandwidth shaping/throttling script that shapes traffic based on user group. That is, if user1, user2, are in user group group1, they will have 1mb/s download and 1mb/s upload, whilst if user3 and user4 are in group2, they will have 256kb/s download and 256kb/s upload. I've read a bit about this and I found some iptables and TC implementations of a per user solution, but I have not seen anything for a user group. Hopefully it can be simply implemented in form of a custom iptables rules and script running with TC or the like. Here is a script I was looking into that does a system wide throttle: http://atmail.com/kb/2009/throttling-bandwidth/ I assume it is possible to do user group throttling since it is possible for throttling on a per user basis. Thanks for any info you can provide for this question.

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Oracle Weblogic 12c for New Projects–Webcast November 7th 2013

- by JuergenKress

Fast-growing organizations need to stay agile in the face of changing customer, business or market requirements. Oracle WebLogic Server 12c is the industry's best application server platform that allows you to quickly develop and deploy reliable, secure, scalable and manageable enterprise Java EE applications. WebLogic Server Java EE applications are based on standardized, modular components. WebLogic Server provides a complete set of services for those modules and handles many details of application behavior automatically, without requiring programming. New project applications are created by Java programmers, Web designers, and application assemblers. Programmers and designers create modules that implement the business and presentation logic for the application. Application assemblers assemble the modules into applications that are ready to deploy on WebLogic Server. Build and run high-performance enterprise applications and services with Oracle WebLogic Server 12c, available in three editions to meet the needs of traditional and cloud IT environments. Join us, in this webcast, as we will show you how WebLogic Server 12c helps you building and deploying enterprise Java EE applications with support for new features for lowering cost of operations, improving performance, enhancing scalability. Agenda Oracle WebLogic Server Introduction Application Development on WebLogic Using Java EE Overview of the Application Deployment Process Monitoring Application Performance Q&A November 07th, 2013 9am UTC/11am EET REGISTER NOW WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Wiki Technorati Tags: education,WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress

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Grid collision - finding the location of an entity in each box

- by Gregg1989

I am trying to implement grid-based collision in a 2d game with moving circles. The canvas is 400x400 pixels. Below you can see the code for my Grid class. What I want it to do is check inside which box the entities are located and then run a collision check if there are 2 or more entities in the same box. Right now I do not know how to find the position of an entity in a specific box. I know there are many tutorials online, but I haven't been able to find an answer to my question, because they are either written in C/C++ or use the 2d array approach. Code snippets and other help is greatly appreciated. Thanks. public class Grid { ArrayList<ArrayList<Entity>> boxes = new ArrayList<>(); double boxSize = 40; double boxesAmount = 10; ... ... public void checkBoxLocation(ArrayList<Entity> entities) { for (int i = 0; i < entities.size(); i++) { // Get top left coordinates of each entity double entityLeft = entities.get(i).getLayoutX() - entities.get(i).getRadius(); double entityTop = entities.get(i).getLayoutY() + entities.get(i).getRadius(); // Divide coordinate by box size to find the approximate location of the entity for (int j = 0; j < boxesAmount; j++) { //Select each box if ((entityLeft / boxSize <= j + 0.7) && (entityLeft / boxSize >= j)) { if ((entityTop / boxSize <= j + 0.7) && (entityTop / boxSize >= j)) { holdingBoxes.get(j).add(entities.get(i)); System.out.println("Entity " + entities.get(i) + " added to box " + j); } } } } } }

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Workaround for API limits [closed]

- by blunders

Problem: Planning on building out a client services company that requires access to APIs. Most APIs are limited based on user, IP, etc. - and even though the API calls would be on a per client basis, there's no way to get usage not tied to IPs. (Theoretical) Solution: Have each client install on their network a proxy/VPN that would allow my systems to connect and use their assigned usage. So, it's possible there's a better solution than the one I've thought of, but it's the only one I've been able to come up with.

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When adding second processor to SQL Server, will it automatically balance the load?

- by ddavis

We have a SQL Server 2008 R2 (10.5) on a dedicated box with a single 2.4Ghz processor, which regularly runs at 70-80% CPU. We are going to be adding a significant number of users to the application and therefore want to add a second processor to the box (scale up). Will SQL Server automatically use the second processor to balance threads, or is there additional configuration that will need to be done? In other words, will adding the second processor drop my CPU usage to 35-40% per CPU, automatically balancing the load? Based on what I read here, it seems that it will: http://msdn.microsoft.com/en-us/library/ms181007.aspx However, I've read elsewhere that CPU performance gains can be made by assigning database tables to different filegroups, but I'm not sure we want to get that complicated at this point.

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Small, simple LDAP server as an alternative to OpenLDAP

- by jstarek

I have taken a look at the installation and configuration instructions for the newer OpenLDAP releases and decided that it's too much work to set up for my small userbase. Basically, I only use LDAP to synchronize user accounts on a small number of machines (ok, this does not really require a directory server) and to give those users access to some web-based tools, avoiding the need to create user accounts in several places. Can you recommend a small, simple LDAP server for use on *nix systems? My only requirements are the ability to serve up PosixAccount and Group objects via LDAP.

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CentOS 6 init script doesn't work properly

- by user711643

I'm setting up my ruby production server based on CentOS 6. I need a process called god (which is a process monitoring tool) to start at boot. I'm using an init script that I found here. Just as stated in the guide I ran: chkconfig --add god and then chkconfig --level 345 god on After this if I run "service god start|restart" everything works. It loads the available configurations and brings up the related processes (if they are not running). Problem is it doesn't work at boot. If I reboot the system, then I do "ps -aux | grep god". At this point "god" is running but apparently it didn't load the configuration files. If i run again service god restart, it loads everything without problems. What am I doing wrong?

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Replicate a big, dense Windows volume over a WAN -- too big for DFS-R

- by Jesse

I've got a server with a LOT of small files -- many millions files, and over 1.5 TB of data. I need a decent backup strategy. Any filesystem-based backup takes too long -- just enumerating which files need to be copied takes a day. Acronis can do a disk image in 24 hours, but fails when it tries to do a differential backup the next day. DFS-R won't replicate a volume with this many files. I'm starting to look at Double Take, which seems to be able to do continuous replication. Are there other solutions that can do continuous replication at a block or sector level -- not file-by-file over a WAN?

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Changing location in Google Chrome when searching

- by Alex

I've recently moved to the Czech Republic from Scotland and I can't find a way to permanently stop Google from automatically defaulting back to google.cz all the time. I've checked to ensure that all my google accounts and cookie based settings (e.g. Advanced Search Options) are set to English but it's still clearly doing an IP address lookup and disregarding everything else. The default Search Engine for Google Chrome (and switches to google.cz automatically): {google:baseURL}search?{google:RLZ}{google:acceptedSuggestion}{google:originalQueryForSuggestion}sourceid=chrome&ie={inputEncoding}&q=%s I've tried hardcoding it to: http://www.google.com/search?{google:RLZ}{google:acceptedSuggestion}{google:originalQueryForSuggestion}sourceid=chrome&ie={inputEncoding}&q=%s this kind of works, but won't work for inline searching, i.e. I always have to press enter in order to get any results which is a bit annoying as I've gotten so used to AJAX style searching I can't have been the only one to get this issue? Any help is appreciated

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Developer with 4 years experience with Java/C++. How to move into web programming? [closed]

- by JerryC

Possible Duplicate: Tips for switching jobs and moving into web based programming? I graduated in 2006 with a computer science degree and got solid grades (3.5 overall 3.8 in my major) For the past 4.5 years I've been working as a Software Engineer doing primarily rich client development. Most of my experience is with Java, Swing and C++. I've done a lot of network programming and I have acquired some skill working & debugging in distributed environments. I would like to switch jobs and move into a role where I can get exposure to some new technologies and frameworks. I would like to move into a more web development role but I find my lack of web development experience is hurting me. 90% of the jobs I see advertised are looking for one of two skill sets: 1) Stereotypical server side Java web developer. Experience with Spring, Hibernate, J2EE, etc. 2) Stereotypical front end web developer. Experience with Javascript, jQuery, HTML5, GWT, CSS, etc I find most of these companies are looking really specifically for this experience and they are not willing to take on good programmers/ CS fundamental guys who lack experience with this stuff. I would love to get a job doing stuff like this, but have my skills become out of date and unmarketable? Any opinions on ways to sell myself to help get a new position?

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Nagios and rrd on a old server

- by Pier

I have an old server (P4 based) on which nagios (and all the other tools to monitor) is running. In the last few weeks we are seeing a strange behavior. In the /var/spool/pnp4nagios (where temporary files are stored before getting processed by pnp4nagios daemon) we have many files like perfdata.1274949941-PID-18839 and we get an error in npcd.log: [05-27-2010 11:17:46] NPCD: ThreadCounter 0/15 File is perfdata.1274951306-PID-27849 [05-27-2010 11:17:46] NPCD: File 'perfdata.1274951306-PID-27849' is an already in process PNP file. Leaving it untouched. Sometimes some graph are not drawn. The server is pretty loaded (around 5-6 normally) and i suspect that npcd goes in timeout and leave those files behind. What could I do (apart from change the server)? Few infos about the system: centos 5.5 nagios 3.2.1 pnp4nagios 0.6 (from sources) Thanks

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How can i compare Audio, what programming language should i use

- by Pimmetje

I have 2 audio files that are from almost the same source. But at some points there shifted a bit. Also the codecs does not match. I would like to make a program that takes a sample 2 - 4 seconds. And looks for it in the other file. (Most of the time it's not shifted more than 30 seconds). Than take the time and store it, Go ahead for a few seconds take a sample and find it again. This way i want to create a file where i can see on what points the file is shifted. For people who are more interested in what i want. I have a audio/video file speech and subtitles. But i have same speech from different sources with differs a bit in time. And i like to make a program that can correct the subtitle time for me. Enough about the problem I looked on the Internet for ways to compare audio files. Based on what i read comparing 2 audio files isn't that easy as i had hoped. Some talk about algorithms http://www.perlmonks.org/?node_id=169641 Some audio-library's portaudio.com aubio.org sourceforge.net/projects/ccaudio/ ambiera.com/irrklang/ The biggest problem i have is that i can't find something i can generate from the audio that i can use to compare with. I hope someone here can point me in the right direction.

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Automatic switching between monitor configurations

- by Michael Aquilina

I have a laptop and an external monitor and i was wondering if there was a simple approach to switching between multiple monitor configurations based on the detected available displays. For example: When i am at home and i plug in my external monitor i would like this to automatically become enabled and the laptop screen to become disabled. As soon as i pull out the display cable for the external monitor, i would like the laptop screen to automatically become enabled. I was expecting this to just "work" just like it does in windows - but it seems to be much harder than that. I am aware of the xrandr command to turn displays on and off but i cannot seem to find a way to get this to work the way i describe above. I had also found this post about switching between multiple monitor configurations and the results seem a bit inconclusive. However i was hoping that with xrandr there would be a simpler solution. For me, the fact that when i pull out my external monitor the screen just goes black and i get an error message is a big issue holding me back from making the complete switch to linux as i move around alot as a student. My OS of choice is currently Kubuntu 12.04 but i am willing to change to something else if it provides a better way of setting up the described setup.

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Can't connect nonlocally after 12.10 upgrade

- by user101815

I've just upgraded one of my systems from 12.04 to 12.10. Now I can't connect on that system beyond my local network. Connections within the local network seem to work fine, and I can make nonlocal connections from other machines (like the one I'm asking this question from). I suspect that some routing information has been messed up, but I don't know where to look for it. It's not a nameserver problem -- pinging outside sites by their IP addresses doesn't work either. I have another laptop next to this one, also running Kubuntu 12.10. On the one that can't connect, arp produces no output. On the other one, it produces 192.168.0.1 ether 00:23:69:fa:ce:ae C wlan0 On the working machine, the output of netstat starts with some tcp entries. On the nonworking one, those entries are absent. I asked this question on the Ubuntu forum but haven't gotten any answers there. One further complication: since the troublesome machine has no outside connection, it's extremely difficult to download anything to it. For what it's worth, "ping 8.8.8.8" produces "connect: Network is unreachable". Update: after a lot of fiddling, I have my external world back. I don't know what the key action was, but the first indication of progress was that "ping 8.8.8.8" worked. At that point I still didn't have a working nameserver, so external URLs didn't work. But I did this (based on an online post, of course): sudo dpkg-reconfigure resolvconf and answered Yes to all prompts. That did the trick!! Apparently my problem was unique, or close to it, since I couldn't find any online references to it: local net working, remote net not working, including explicit IP addresses. So I suppose that if no one else has this problem, no one cares about the solution!!

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Explorer fails to load with UAC enabled

- by user37679

While running an InstallShield based installer, my Windows 7 machine became unresponsive. After forcing a reboot, I can log in to the system, but explorer does not run. I can log in as a different user without issue and when I change UAC to its lowest setting, I can log in as the user that was performing the install. However, if I re-enable UAC, I am unable to get explorer to run again on login. I have checked the HKCU\Software\Microsoft\Windows\CurrentVersion\Run and RunOnce, but don't see anything that isn't configured to run on startup. I completed the installation of the software as the "good" user without issue.

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Copy only remaining rows after filter to new Excel Workbook

- by Joel Coehoorn

I have an Excel file with an external data connection set up. It pulls data in directly from a database, and gives us about 450 rows. The header row allows us to filter the data in the sheet, and we use this as a general purpose tool... I will use the filters to narrow down what I'm looking at based on criteria that change depending on the circumstance. Often, after filtering the data, I want to send just the filtered records to another person. I'd like to copy/paste just the remaining rows into a new Workbook to send via e-mail. Unfortunately, this doesn't work. When I paste the data, it still pastes all the data. The filtered rows are still in the workbook... they're just hidden. I want them gone from the new file completely. How can I do this?

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Accessing our Intranet from outside our Network - WITHOUT VPN

- by westexasman

We just upgraded our company intranet from an IIS based, ASP (poorly written) server/code base to a Windows Server 2008 r2 (Apache/MySQL/PHP) server. The old server allowed users to login to intranet.xxx.org using there AD user/pass which then lead them to the company Intranet from basically anywhere they had Internet access. We want to mimic that functionality (or change it to something more secure) with the new setup. This was seemingly setup for off-site employees running on a state network. The state network does not allow VPN, therefor, we needed a way to allow those employees access to the Intranet. So, how do we go about allowing users to login from the outside world and gain access to our Intranet?

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Is there a proven concept to website reverse certificate authentication?

- by Tom

We're looking at exposing some of our internal application data externally via a website. The actual details of the website aren't that interesting, it'll be built using ASP.NET/IIS etc, that might be relevant. With this, I'm essentially I'm looking for a mechanism to authenticate users viewing my website. This sounds trivial, a username/password is typically fine, but I want more. Now I've read plenty about SSL/x.509 to realise that the CA determines that we're alright, and that the user can trust us. But I want to trust the user, I want the user to be rejected if they don't have the correct credentials. I've seen a system for online banking whereby the bank issues a certificate which gets installed on the users' computer (it was actually smartcard based). If the website can't discover/utilise the key-pair then you are immediately rejected! This is brutal, but necessary. Is there a mechanism where I can do the following: Generate a certificate for a user Issue the certificate for them to install, it can be installed on 1 machine If their certificate is not accessible, they are denied all access A standard username/password scheme is then used after that SSL employed using their certificate once they're "in" This really must already exist, please point me in the right direction! Thanks for your help :)

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VPS stops responding every now and again

- by Or W

I have a Linode vps that I use to host some of my websites on. It's Ubuntu based and it's up to date in terms of all packages. I don't have any cron jobs scheduled or any automatic processes. I host a few (up to date) wordpress blogs there that have very little traffic altogether. Every day (at a different time) my server stops responding, I can't SSH to it, web access is getting timed out and it just dies until I reboot it through the Linode manager. On the linode dashboard I can see that the CPU is not very high (2-3%) Incoming/Outgoing traffic is on 0 and the IO count has a spike just before the server stops responding (SWAP IO is at 2k and IO Rate is at 5k). When I reboot the server everything is just fine. I'm trying to figure out a way to analyze what's going on at these random times where the server freezes up. How can I determine the problem?

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What is the best way to configure the number of workers in Apache?

- by rbm

My site receives a lot of traffic for 2 hours during the day (2000 hits per minute). The rest of the day receives less traffic(500e hits per minute). I have been experimenting with the MaxClients and MaxSpareServers values but I still get some downtime during peek hours. How can I calculate the best values for my configuration based on the amount of ram that I have ? Each process is like 36-40 M of Memory total used free shared buffers cached Mem: 3096 793 2302 0 0 0 -/+ buffers/cache: 793 2302 Swap: 0 0 0 Values that I am using now <IfModule prefork.c> StartServers 10 MinSpareServers 22 MaxSpareServers 60 ServerLimit 90 MaxClients 90 MaxRequestsPerChild 400 </IfModule>

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