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• How to handle shoot instructions, in a multiplayer TD

  - by Martin Elvar Jensen

  I'm currently working on a Multiplayer Tower Defense game, using ImpactJS & Node. I seek some clarification about how to handle projectiles from towers, let me explain. So the server is running the master game, and the clients just follow the instruction from the server. Lets say there is about 20 towers on the stage, all needs instructions for which creeps to shoot at. Now lets say each towers fires twice in a second, that's 40 shots each second, (worst case scenario) which is 40 request per second to each client, would't this casue alot of stress to the server, saying that we have 50 games running the same time. So what i am really asking, is this method inefficient, and is there a smarter way to handle all these instructions. Thank you.

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• Protect js code from being stolen

  - by Kaidul Islam Sazal

  I have developed an web app with jquery,html-css markup which would be an premium web app. So I have to ensure the security of the code from being stolen.But as all these are client side,so there is no 100% secure way to protect them.But I want to make them harder to steal.For this I did : I have disabled the right click button of mouse I have minified and obfuscated the code. I have used js code to add external js file and obfuscated the code so that none can understand the name of the external js file I have created a index.html file in the js folder so that none can get access the js folder Do you think all these are enough to make stealing harder? Or any suggestion/advice for me?

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• Authentication for users on a Single Page App?

  - by John H

  I have developed a single page app prototype that is using Backbone on the front end and going to consume from a thin RESTful API on the server for it's data. Coming from heavy server side application development (php and python), I have really enjoyed the new different design approach with a thick client side MVC but am confused on how best to restrict the app to authenticated users who log in. I prefer to have the app itself behind a login and would also like to implement other types of logins eventually (openid, fb connect, etc) in addition to the site's native login. I am unclear how this is done and have been searching - but unsuccessful in finding information that made it clear to me. In the big picture, what is the current best practice for registering users and requiring them to login to use your single page app? Once a user is logged in, how are the api requests authenticated? Can I store a session but how do I detect for this session in the API calls? Any answers to this would be much appreciated!

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• Message Buffers in cloud

  - by kaleidoscope

  Message Buffer is WCF queue in the cloud (although currently it does not provide all features of WCF queue). With on-premise WCF, you can take advantage of MSMQ, so that a message is sent to MSMQ by one endpoint, and another endpoint can get the message in a later time. The message is usually a SOAP message so that you can generate a client proxy and invoke the service operations just as invoking a normal WCF operation. Message Buffer is similar, but it also provides a REST API for you to work with the messages. Use it when you need a reliable WCF service. Message buffers can be consumed by non-azure components, "Message  buffers are accessible to applications using HTTP and do not require the Windows Azure platform AppFabric SDK"              How to: Configure an AppFabric Service Bus Message Buffer :    please find below link for more details: http://msdn.microsoft.com/en-us/library/ee794877.aspx http://msdn.microsoft.com/en-us/library/ee794877.aspx   Chandraprakash, S

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• The MySQL service is in the status "starting" on windows

  - by andres descalzo

  I have several months working to "MySQL-5-1-47" on windows 2003. When I restarted, the service "MySQL" stay in this state "starting". The only way to raise the service was running the program directly: C:\Program Files\MySQL\MySQL Server 5.1\bin\mysqld This is the MySQL error log 100906 16:07:29 [Note] Event Scheduler: Purging the queue. 0 events 100906 16:07:32 InnoDB: Starting shutdown... 100906 16:07:37 [Note] Plugin 'FEDERATED' is disabled. 100906 16:07:38 InnoDB: Shutdown completed; log sequence number 0 44233 100906 16:07:38 [Note] mysqld: Shutdown complete 100906 16:07:39 InnoDB: Started; log sequence number 0 44233 100906 16:17:21 [Note] Plugin 'FEDERATED' is disabled. 100906 16:17:22 InnoDB: Started; log sequence number 0 44233 100906 16:22:01 [Note] Plugin 'FEDERATED' is disabled. 100906 16:22:02 InnoDB: Started; log sequence number 0 44233 100906 16:22:02 [Note] Event Scheduler: Loaded 0 events 100906 16:22:02 [Note] C:\Program Files\MySQL\MySQL Server 5.1\bin\mysqld.exe: ready for connections. Version: '5.1.47-community' socket: '' port: 3306 MySQL Community Server (GPL) The last lines are after loading the program from the shell Thank.

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• Ensure we're found in Facebook search for both full & abbreviated company names?

  - by hawbsl

  We have a client with a facebook page, let's say his company is called Bob Roberts Super Widgets. And if you search in Facebook for Bob Roberts Super Widgets then up he pops. But the shorthand he's commonly known by is BR Super Widgets and indeed the website we've created for him is br-super-widgets.com. In Facebook, searching for BR Super Widgets doesn't show up our Mr Bob. We don't have a lot of Facebook expertise, so asking for help here. Does anyone know how to ensure you're found in Facebook search for both short and long company names? Have found this this similar question in the Facebook forum but the poor old questioner never got a response.

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• Free Java Workshops at Mobile World Congress

  - by Jacob Lehrbaum

  Are you attending Mobile World Congress in Barcelona next week? If so, you might want to register for Oracle's free workshop series taking place in the App Planet. We will be hosting a series of 25 workshops in our booth covering a range of topics that include: Benefits of Deploying Phones with Oracle Java Wireless Client Oracle's Embedded Java solutions for Machine-to-Machine applications Building better User Interfaces with the Lightweight User Interface Toolkit Resources to help you leverage Operator Network APIs in your Applications The Java Verified Program: new trusted status and other recent initiatives Building better mobile enterprise applications with Oracle's ADF Mobile technology How to build a profitable mobile applications business with Java ME Guest speakers from Orange, Telefonica and from leading ISVs REGISTER NOW for one or more workshops in the Oracle Java Booth 7C18 located in the App Planet. Oh, and did we mention there might be giveaways? Note: you may need to "sign out" if you have an account on Oracle.com in order to see the registration page

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• What are events SQL profiler eventclass numbers 65527,65528,65533,65534

  - by simonsabin

  I’ve been trying to use RML to process some files and couldn’t figure out why the numbers where all so much smaller than they should be. I then found a line in the RML output “Found [TRACE_STOP] event indicating the end of the trace files” This causes RML to stop processing further data, oh. In my case I had stopped the trace to add some error events because the client was experiencing errors. How do I get RML to process all the other data I wondered. This lead me to the eventclasses in the trace...(read more)

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• In a SSL web application, what would be the vulnerabilities of using session based authentication?

  - by Thomas C. G. de Vilhena

  I'm not sure the term even exists, so let me explain what I mean by "session based authentication" through some pseudo-code: void PerformLogin(string userName, string password) { if(AreValidCredentials(userName, password)) { Session.Set("IsAuthenticated", true); } else { Message.Show("Invalid credentials!"); } } So the above method simply verifies the provided credentials are valid and then sets a session flag to indicate that the session user is authenticated. Under plain HTTP that is obviously unsafe, because anyone could hijack the session cookie/querystring and breach security. However, under HTTPS the session cookie/querystring is protected because client-server communication is encrypted, so I believe this authentication approach would be safe, wouldn't it? I'm asking this because I want to know how authentication tickets can improve web applications security. Thanks in advance!

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• How to get working cups command line tools on Server 14.04

  - by Nick

  It looks like some of the commands like lpr and lprm have broken versions that don't work with cups. These commands worked properly on 10.04. lpr for cups has an -o option, but no lpr is intalled when cups is installed, and the lpr installed with apt-get install lpr does not have the -o option and does not appear to be the cups version of lpr. man lpr shows BSD General Commands Manual at the top, where man lpr on the Ubuntu 10.04 server said Apple, inc in the same spot. which leads me to believe the "wrong" lpr is in the "lpr" package or package names got moved around. There is also a lprng package, but trying to install it wants to remove cups and cups-client. lprm also returns lprm: PrinterName: unknown printer when PrinterName is in fact a valid printer installed with cups and does appear in lpstat -t. How do I get the proper cups versions of lpr working on Server 14.04?

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• Video monetising and simple shop, platform?

  - by fieldman

  I have this client that wants a single-product website. The product is a training-video that they want to deliver virtually and optionally physically. I usually do all the front-end design and back-end development but the budget is close to $0 to start with. So I'm looking for a platform like shopify or something where a shop/cart can be set up quickly and simply with minimal up-front cost - but which can accomodate some kind of paywall (DRM too?) for the online video with an option to purchase for an aditional cost the physical DVD. Am I approaching the wrong way all together? Or do you know of any platform that will accomodate the specs?

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• Transparent proxying in MacOS X 10.6 Snow Leopard (and maybe FreeBSD)

  - by apenwarr

  I'm trying to create a transparent proxy on my MacOS machine in order to port the sshuttle ssh-based transproxy VPN from Linux. I think I almost have it working, but sadly, almost is not 100%. Short version is this. In one window, start something that listens on port 12300: $ while :; do nc -l 12300; done Now enable proxying: # sysctl -w net.inet.ip.forwarding=1 # sysctl -w net.inet.ip.fw.enable=1 # ipfw add 1000 fwd 127.0.0.1,12300 log tcp from any to any And now test it out: $ telnet localhost 9999 # any port number will do # this works; type stuff and you'll see it in the nc window $ telnet google.com 80 # any host/port will do # this *doesn't* work! After the latter experiment, I see lines like this in netstat: $ netstat -tn | grep ^tcp4 tcp4 0 0 66.249.91.104.80 192.168.1.130.61072 SYN_RCVD tcp4 0 0 192.168.1.130.61072 66.249.91.104.80 SYN_SENT The second socket belongs to my telnet program; the first is more suspicious. SYN_RCVD implies that my SYN packet was correctly captured by the firewall and taken in by the kernel, but apparently the SYNACK was never sent back to telnet, because it's still in SYN_SENT. On the other hand, if I kill the nc server, I get this: $ telnet google.com 80 Trying 66.249.81.104... telnet: connect to address 66.249.81.104: Connection refused telnet: Unable to connect to remote host ...which is as expected: my proxy server isn't running, so ipfw redirects my connection to port 12300, which has nobody listening on it, ie. connection refused. My uname says this: $ uname -a Darwin mean.local 10.2.0 Darwin Kernel Version 10.2.0: Tue Nov 3 10:37:10 PST 2009; root:xnu-1486.2.11~1/RELEASE_I386 i386 Does anybody see any different results? (I'm especially interested in Snow Leopard vs Leopard results, as there seem to be some internet rumours that transproxy is broken in Snow Leopard version) Any advice for how to fix?

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• RESTful Java on Steroids (Parleys, Podcast, ...)

  - by alexismp

  As reported previously here, the JAX-RS 2.0 (JSR 339) expert group is making good progress. If you're interested in what the future holds for RESTful Java web services, you can now watch Marek's Devoxx presentation or listen to him in the latest Java Spotlight Podcast (#74). Marek discusses the new client API, filters/handlers, BeanValidation integration, Hypermedia support (HATEOAS), server-side async processing and more. With JSR 339's Early Draft Review 2 currently out, another draft review is planned for April, the public review should be available in June while the final draft is currently scheduled for the end of the summer. In short, expect completion sometime before the end of 2012.

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• Version hash to solve Event Sourcing problems

  - by SystematicFrank

  The basic examples I have seen about Event Sourcing do not deal with out of order events, clock offsets in different systems and late events from system partitions. I am wondering if more polished Event Sourcing implementations rely on a version stamp of modified objects? For example, assuming that the system is rendering the entity Client with version id ABCD1234. If the user modifies the entity, the system will create an event with the modified fields AND the version id reference to which version it applies. Later the event responder would detect out of order events and merge them.

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• Not-So-Well-Known features of Ubuntu

  - by Khaja Minhajuddin

  Ubuntu always surprises me by making things easier in unexpected ways. But, it isn't always obvious, For instance When I was looking for a tool to RDP into windows, I found that Ubuntu already has an pre-installed app called Terminal Server Client which has this functionality. I am sure there are many such hidden things which are not known to the average user. This thread could be used to expose these little gems. EDIT: Maybe the choice of my words was wrong, Are there any things which you found were not very obvious?

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• How to have a maintainable and manageable Javascript code base

  - by dade

  I am starting a new job soon as a frontend developer. The App I would be working on is 100% Javascript on the client side. all the server returns is an index page that loads all the Javascript files needed by the app. Now here is the problem: The whole of the application is built around having functions wrapped to different namespaces. And from what I see, a simple function like rendering the HTML of a page can be accomplished by having a call to 2 or more functions across different namespace... My initial thought was "this does not feel like the perfect solution" and I can just envisage a lot of issues with maintaining the code and extending it down the line. Now I would soon start working on taking the project forward and would like to have suggestions on good case practices when it comes to writing and managing a relatively large amount of javascript code.

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• Software Architecture - From design to sucessful implementation

  - by user20358

  As the subject goes; once a software architect puts down the high level design and approach to a software that is to be developed from scratch, how does the team ensure that it is implemented successfully? To my mind the following things will need to be done Proper understanding of requirements Setting down coding practices and guidelines Regular code reviews to ensure the guidelines are being adhered to Revisiting the requirements phase and making necessary changes to design based on client inputs if there are any changes to requirements Proper documentation of what is being done in code Proper documentation of requirements and changes to them Last but not the least, implementing the design via object oriented code where appropriate Did I miss anything? Would love to hear any mistakes that you have learned from in your project experiences. What went wrong, what could have been done better. Thanks for taking the time..

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• Azure Table Storage Creation using Nov 2009 CTP

  - by kaleidoscope

  The new SDK introduces a new class - · The CloudTableClient : This new class enables us to create tables and test for the existence of tables. We need not need use this class for querying table storage, it's   more of an administrative class for dealing with table storage itself.   · Once we have got the account key and the account name from ConfigurationSetting, we can create an instance of the storage credentials and table client classes:   StorageCredentialsAccountAndKey creds = new StorageCredentialsAccountAndKey(accountName, accountKey);     CloudTableClient tableStorage = new CloudTableClient(tableBaseUri, creds);     CustomerContext ctx = new CustomerContext(tableBaseUri, creds);     //where tableBaseUri is the TableStorageEndpoint obtained from ConfigurationSetting Using the table storage class, we can now create a new table (if it doesn't already exist):     if (tableStorage.CreateTableIfNotExist("Customers"))     {        CustomerRow cust = new CustomerRow("AccountsReceivable", "kevin");         cust.FirstName = "Kevin";        cust.LastName = "Hoffman";        ctx.AddObject("Customers", cust);        ctx.SaveChanges();     } For a complete article on this topic please follow this link: http://dotnetaddict.dotnetdevelopersjournal.com/azure_nov09_tablestorage.htm Tinu, O

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• Is it good practice to analyse who introduced each bug?

  - by Michal Czardybon

  I used to analyse performance of programmers in my team by looking at the issues they have closed. Many of the issues are of course bugs. And here another important performance aspect comes - who introduced the bugs. I am wondering, if creating a custom field in the issue tracking system "Blamed" for reporting the person who generated the problem, is a good practice. One one hand it seems ok to me to promote personal responsibility for quality and this could reduce the additional work we have due to careless programming. On the other hand this is negative, things are sometimes vague and sometimes there is a reason such us "this thing had to be done very quickly due to a client's...". What to you think?

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• C++ : Lack of Standardization at the Binary Level

  - by Nawaz

  Why ISO/ANSI didn't standardize C++ at the binary level? There are many portability issues with C++, which is only because of lack of it's standardization at the binary level. Don Box writes, (quoting from his book Essential COM, chapter COM As A Better C++) C++ and Portability Once the decision is made to distribute a C++ class as a DLL, one is faced with one of the fundamental weaknesses of C++, that is, lack of standardization at the binary level. Although the ISO/ANSI C++ Draft Working Paper attempts to codify which programs will compile and what the semantic effects of running them will be, it makes no attempt to standardize the binary runtime model of C++. The first time this problem will become evident is when a client tries to link against the FastString DLL's import library from a C++ developement environment other than the one used to build the FastString DLL. Are there more benefits Or loss of this lack of binary standardization?

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• Per connection bandwidth limit

  - by Kyr

  Apparently, our server box running Windows Server 2008 R2 has a per connection bandwidth limit of 0.2 MB/s. Meaning, while one TCP connection can pull at max 0.2 MB/s, 60 parallel connections can pull 12 MB/s. We first noticed this when trying to checkout large SVN repository from this server. I used a simple Java application to test this, transferring data from server to workstation using variable number of threads (one connection per thread). Server part of the application simply writes 1 MB memory buffer to socket 100 times, so there is no disk involvement. Each connection topped at 0.2 MB/s. Same per connection limit was for only one as was for 60 parallel connections. The problem is that I have no idea from where this limit comes from. I have very little experience administrating Windows Server, so I was mostly trying to find something by googling. I have checked the following: Local Computer Policy QoS Packet Scheduler Limit reservable bandwidth: it's Not configured; Group Policy Management Console: we have two GOPs, but neiher has any Policy-based QoS defined; There isn't any bandwidth limiter program installed, as far as I can tell. We're using standard Windows Firewall. I can update this question with any additional information if needed.

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• What to do when issue-tracker is down?

  - by Pablo

  It has happened in our team that our issue-tracker is down. Happens about once a week now (yes, wow), and there's not really much we can do to get it back up, since it's hosted by our client in a different timezone. It sometimes takes several hours for it to be operative again. In the meanwhile, we can't really tell which issues we were working on, and in case we do, we cannot update those issues, as in moving them through the workflow, logging used hours, checking the issue's description, leaving comments, and so on. So the question is: how can we, as a team, work in the meanwhile so that when the issue-tracker is up again, we have the least possible hassle updating it with what we've been working?

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• Bugzilla Install question - I'm stuck

  - by Nabeel

  I run Bugzilla's checksetup.pl (migrating an older version), and it always returns: Reading ./localconfig... Checking for DBD-mysql (v4.00) ok: found v4.005 Had to create DBD::mysql::dr::imp_data_size unexpectedly at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBI.pm line 1229, <DATA> line 225. Use of uninitialized value in subroutine entry at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBI.pm line 1229, <DATA> line 225. Had to create DBD::mysql::db::imp_data_size unexpectedly at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBI.pm line 1259, <DATA> line 225. Use of uninitialized value in subroutine entry at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBI.pm line 1259, <DATA> line 225. There was an error connecting to MySQL: Undefined subroutine &DBD::mysql::db::_login called at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBD/mysql.pm line 142, <DATA> line 225. MySQL Version: [root@bugzilla-core TMP]# mysql --version mysql Ver 14.12 Distrib 5.0.60sp1, for redhat-linux-gnu (x86_64) using readline 5.1 And mysql_config: [root@bugzilla-core TMP]# mysql_config Usage: /data01/mysql-5.0.60/bin/mysql_config [OPTIONS] Options: --cflags [-I/data01/mysql-5.0.60/include -g] --include [-I/data01/mysql-5.0.60/include] --libs [-rdynamic -L/data01/mysql-5.0.60/lib -lmysqlclient -lz -lcrypt -lnsl -lm -lmygcc] --libs_r [-rdynamic -L/data01/mysql-5.0.60/lib -lmysqlclient_r -lz -lpthread -lcrypt -lnsl -lm -lpthread -lmygcc] --socket [/tmp/mysql.sock] --port [0] --version [5.0.60sp1] --libmysqld-libs [-rdynamic -L/data01/mysql-5.0.60/lib -lmysqld -lz -lpthread -lcrypt -lnsl -lm -lpthread -lrt -lmygcc] Now, I've tried the latest version of DBD-mysql (4.0.14). I'm completely lost and stumped. I'm not sure where to go from here. Scouring the 'webs haven't returned anything fruitful. Any ideas?

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• Sample size and statistical significance in Google Analytics

  - by colmcq

  I have been asked to compile a report into dropout rates during checkout for a global webstore I have used a sample size over one month as my sample because: google analytics slows to a crawl over larger sample sizes and makes much of the analysis agonisingly small I believe it to be statistically significant and a representative sample My client has asked me why I didn't use yearly figures and wants proof that one month of data is 'statistically significant'. Am I right in thinking that I need to compare the standard deviation of my monthly sample to the yearly sample and ensure that the deviation is under a certain %age? Question: how do I prove one month of Google Analytics data is representative to one year worth of data? Stats: 90k unique views/month ~1.1m per year.

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• Is this processor burned?

  - by Jhonnytunes

  I've recently exchange the processors in two PCChips boards. Both boards are LGA775. Board A is P17G(Pentium 4 HyperThreading 3GHz) and board B is P49G(Pentium Dual Core 3GHz). I use board A to watch videos, and some of them are 3GB size and this is why I exchanged the CPU. I installed Dual Core in board A and it worked out of the box, now 3GB videos use 5% of CPU instead of 50%. When I installed the pentium in the board B, I forgot to connect the 4pin power and, when i powered on the PC, the CPU fan stay off. Then, I connected all right this time, and now the board doesnt show video. I think the CPU is not working but im not sure about that. The PC turns on and the HD spins, the CPU fan spins, network socket blinking, but not video and case power led is neither blinking. I tried with other PSU and everything was the same. I figure out that CPU have that paste above. IDK really what's happening, I hope I dont have to buy another CPU. Is it Burned?

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