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  • juju deploy issues

    - by Eduard Lugo
    I'm trying to run juju deploy from my local repository, when I do I get this message. WARNING failed to load charm at "/home/eduard/charms/precise/hooks": open /home/eduard/charms/precise/hooks/metadata.yaml: no such file or directory WARNING failed to load charm at "/home/eduard/charms/precise/hooks": open /home/eduard/charms/precise/hooks/metadata.yaml: no such file or directory Added charm "local:precise/stack-48" to the environment. The charm is running normally but I like this ad Quu not continue appearing. I appreciate the help in advance

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  • So, "Are Design Patterns Missing Language Features"?

    - by Eduard Florinescu
    I saw the answer to this question: How does thinking on design patterns and OOP practices change in dynamic and weakly-typed languages? There it is a link to an article with an outspoken title: Are Design Patterns Missing Language Features. But where you can get snippets that seem very objective and factual and that can be verified from experience like: PaulGraham said "Peter Norvig found that 16 of the 23 patterns in Design Patterns were 'invisible or simpler' in Lisp." and a thing that confirms what I recently seen with people trying to simulate classes in javascript: Of course, nobody ever speaks of the "function" pattern, or the "class" pattern, or numerous other things that we take for granted because most languages provide them as built-in features. OTOH, programmers in a purely PrototypeOrientedLanguage? might well find it convenient to simulate classes with prototypes... I am taking into consideration also that design patterns are a communcation tool and because even with my limited experience participating in building applications I can see as an anti-pattern(ineffective and/or counterproductive) for example forcing a small PHP team to learn GoF patterns for small to medium intranet app, I am aware that scale, scope and purpose can determine what is effective and/or productive. I saw small commercial applications that mixed functional with OOP and still be maintainable, and I don't know if many would need for example in python to write a singleton but for me a simple module does the thing. patterns So are there studies or hands on experience shared that takes into consideration, all this, scale and scope of project, dynamics and size of the team, languages and technologies, so that you don't feel that a (difficult for some)design pattern is there just because there isn't a simpler way to do it or that it cannot be done by a language feature?

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  • Design patterns and multiple programming language

    - by Eduard Florinescu
    I am referring here to the design patterns found in the GOF book. First how I see it, there are a few peculiarities to design pattern and knowing multiple language knowledge, for example in Java you really need a singleton but in Python you can do without it you write a module, I saw somewhere a wiki trying to write all GOF patterns for JavaScript and the entries where empty, I guess because it might be a daunting task. If there is someone who is using design patterns and is programming in multiple programming languages supporting the OOP paradigm and can give me a hint on how should I approach design patterns that might help me in all languages I use(Java, JavaScript, Python, Ruby): Can I write good application without knowing exactly the GOF design patterns or I might need some of them which might be crucial and if yes which one, are they alternatives to GOF for specific languages, and should a programmer or a team make its own design patterns set?

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  • Did Oracle make public any plans to charge for JDK in the near future? [closed]

    - by Eduard Florinescu
    I recently read an article: Twelve Disaster Scenarios Which Could Damage the Technology Industry which mentioned among other the possible "disaster scenarios" also: Oracle starts charging for the JDK, giving the following as argument: Oracle could start requiring license fees for the JDK from everyone but desktop users who haven't uninstalled the Java plug-in for some reason. This would burn down half the Java server-side market, but allow Oracle to fully monetize its acquisitions and investments. [...] Oracle tends to destroy markets to create products it can fully monetize. Even if you're not a Java developer, this would have a ripple effect throughout the market. [...] I actually haven't figured out why Larry hasn't decided Java should go this route yet. Some version of this scenario is actually in my company's statement of risks. I know guessing for the future is impossible, and speculating about that would be endless so I will try to frame my question in an objective answarable way: Did Oracle or someone from Oracle under anonymity, make public, or hinted, leaked to the public such a possibility or the above is plain journalistic speculation? I am unable to find the answer myself with Google generating a lot of noise by searching JDK.

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  • If I define a property to prototype appears in the constructor of object, why?

    - by Eduard Florinescu
    I took the example from this question modified a bit: What is the point of the prototype method? function employee(name,jobtitle,born) { this.name=name; this.jobtitle=jobtitle; this.born=born; this.status="single" } employee.prototype.salary=10000000; var fred=new employee("Fred Flintstone","Caveman",1970); console.log(fred.salary); fred.salary=20000; console.log(fred.salary) And the output in console is this: What is the difference salary is in constructor but I still can access it with fred.salary, how can I see if is in constructor from code, status is still employee property how can I tell for example if name is the one of employee or has been touch by initialization? Why is salary in constructor, when name,jobtitle,born where "touched" by employee("Fred Flintstone","Caveman",1970); «constructor»?

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  • Design patterns and multiple programming languages

    - by Eduard Florinescu
    I am referring here to the design patterns found in the GOF book. First, how I see it, there are a few peculiarities to design pattern and knowing multiple languages, for example in Java you really need a singleton but in Python you can do without it you write a module, I saw somewhere a wiki trying to write all GOF patterns for JavaScript and all the entries were empty, I guess because it might be a daunting task to do that adaptation. If there is someone who is using design patterns and is programming multiple languages supporting the OOP paradigm and can give me a hint on how should I approach design patterns. An approach that might help me in all languages I use(Java, JavaScript, Python, Ruby): Can I write good application without knowing exactly the GOF design patterns or I might need just some of them which might be crucial and if yes which one, are there alternatives to GOF for specific languages, and should a programmer or a team make their own design patterns set?

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  • How can we protect the namespace of an object in Javascript?

    - by Eduard Florinescu
    Continuing from my previous question: Javascript simple code to understand prototype-based OOP basics Let's say we run into console this two separate objects(even if they are called child and parent there is no inheritance between them): var parent = { name: "parent", print: function(){ console.log("Hello, "+this.name); } }; var child = { name: "child", print: function(){ console.log("Hi, "+this.name); } }; parent.print() // This will print: Hello, parent child.print() // This will print: Hi, child temp =parent; parent = child; child = temp; parent.print() // This will now print: Hi, child child.print() // This will now print: Hello, parent Now suppose that parent is a library, as a HTML5 application in a browser this cannot do much harm because is practically running sandboxed, but now with the advent of the ChromeOS, FirefoxOS and other [Browser] OS they will also be linked to a native API, that would be a head out of the „sandbox”. Now if someone changes the namespace it would be harder for a code reviewer (either automated or not ) to spot an incorrect use if the namespaces changes. My question would be: Are there many ways in which the above situation can be done and what can be done to protect this namespaces? (Either in the javascript itself or by some static code analysis tool)

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  • Recent programming language for AI?

    - by Eduard Florinescu
    For a few decades the programming language of choice for AI was either Prolog or LISP, and a few more others that are not so well known. Most of them were designed before the 70's. Changes happens a lot on many other domains specific languages, but in the AI domain it hadn't surfaced so much as in the web specific languages or scripting etc. Are there recent programming languages that were intended to change the game in the AI and learn from the insufficiencies of former languages?

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  • Are there studies on what programming languages does to the brain? [closed]

    - by Eduard Florinescu
    Are there studies on what effects have programming languages on the brain or for that matter any other artificial languages in general, like mathematics ? Speaking from my personal experience I feel very different every time I speak Italian, I feel like a virtuoso on a quest but at the other end when I coded in machine code in debug.exe I felt like the main charcter inp(Movie). Why do I bring this up because I am suspecting that languages affect your mind and popular legends back this up too often: are full of mathematicians that crossed the Rubicon.

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  • Does Ubuntu Touch consume less than Android?

    - by Eduard Florinescu
    One of the problems of new OSs is power consumption. That is because power and performance requires a lot of tweaks and experience with the kernel, drivers and OS code-base on one hand, and a lot of extensive long-term test and quality assurance on the other hand. Given that Android is a rather old and established OS I saw that it has pretty good power consumption. Phoronix does this kind of comparissions but I was not able to find to much about Ubuntu Touch. Does Ubuntu Touch consume less than Android in general, do you have data on some platforms compared?

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  • Does Ubuntu Touch consume less power than Android?

    - by Eduard Florinescu
    One of the problems of new OSs is power consumption. That is because power and performance requires a lot of tweaks and experience with the kernel, drivers and OS code-base on one hand, and a lot of extensive long-term test and quality assurance on the other hand. Given that Android is a rather old and established OS I saw that it has pretty good power consumption. Phoronix does this kind of comparissions but I was not able to find much about Ubuntu Touch. Does Ubuntu Touch consume less than Android, do you have data on some platforms compared?

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  • What is a recent programming language of choice for the AI?

    - by Eduard Florinescu
    For a few decades the programming language of choice for AI was either Prolog or LISP, and a few more others that are not so well known. Most of them were designed before the 70's. Changes happens a lot on many other domains specific languages, but in the AI domain it hadn't surfaced so much as in the web specific languages or scripting etc. Are there recent programming languages that were intended to change the game in the AI and learn from the insufficiencies of former languages?

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  • Simultaneous AI in turn based games

    - by Eduard Strehlau
    I want to hack together a roguelike. Now I thought about entity and world representation and got to a quite big problem. If you want all the AI to act simultaneously you would normally(in cellular automa for examble) just copy the cell buffer and let all action of indiviual cells depend on the copy. Actions which are not valid anymore after some cell before the cell you are currently operating on changed the original enviourment(blocking the path) are just ignored or reapplied with the "current"(between turns) environment. After all cells have acted you copy the current map to the buffer again. Now for an environment with complex AI and big(datawise) entities the copying would take too long. So I thought you could put every action and entity makes into a que(make no changes to the environment) and execute the whole que after everyone took their move. Every interaction on this que are realy interacting entities, so if a entity tries to attack another entity it sends a message to it, the consequences of the attack would be visible next turn, either by just examining the entity or asking the entity for data. This would remove problems like what happens if an entity dies middle in the cue but got actions or is messaged later on(all messages would go to null, and the messages from the entity would either just be sent or deleted(haven't decided yet) But what would happen if a monster spawns a fireball which by itself tracks the player(in the same turn). Should I add the fireball to the enviourment beforehand, so make a change to the environment before executing the action list or just add the ball to the "need updated" list as a special case so it doesn't exist in the environment and still operates on it, spawing after evaluating the action list? Are there any solutions or papers on this subject which I can take a look at? EDIT: I don't need information on writing a roguelike I need information on turn based ai in respective to a complex enviourment.

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  • MySQL port forwarding

    - by Eduard Luca
    I am trying to help a colleague to connect to my MySQL server. However the situation is a bit special, and here's why (let's call him person A and me, person B): Person A has a PC, on which he has a virtual machine, which is in the same network as the actual PC he's running. However person A is also in the same network with person B (a different network). I want the site that lives on A's VM to be able to connect to the MySQL server on B's PC. For this I've thought a port forwarding would be appropriate: from ip-of-person-A:3306 to ip-of-person-B:3306. This way the site would connect to the IP of the PC it's living on (not the VM), which would forward to A's MySQL. I've seen several examples of port forwarding, but I don't think it's what I need, from what I've seen, it's kind of the opposite. So would something like this be achievable?

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  • apache mod_rewrite

    - by eduard-schnittlauch
    Hi, I want mod_rewrite to do this: http://server/* - redirect to http://server/app/* http://server/app/* should not be redirected http://server.domain/* - redirect to http://server/app/* http://server.domain/app* - redirect to http://server/app/* It has to work with mod_jk! Edit: this is the final solution ` force use of host 'server' RewriteCond %{HTTP_HOST} !^server$ RewriteRule ^(.*)$ server$1 [R,NE,L] ` prepend /app to URL if missing RewriteCond %{request_uri} !^/app.*? RewriteRule ^(.+?)$ app/$1 [R,NE,L] Thanks to you, fahadsadah and Insanity5902! I'm hesitant to flag either one of you as 'correct', as both have provided valuable input that made up the final solution.

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  • SSL on local sub-domain and sub-sub-domain

    - by Eduard Luca
    I have both local.domain.com and lmarket.local.domain.com pointing to my localhost from etc/hosts. The problem is that I am using XAMPP on Windows 7, and have 2 SSL VirtualHosts in my apache config, but no matter which one I access, I am taken to local.domain.com. On non-HTTPS requests all works fine, and the vhosts are basically the same. Here is the relevant part of my vhosts: <VirtualHost local.domain.com:443> DocumentRoot "C:/xampp/htdocs/local" ServerName local.domain.com ServerAdmin [email protected] ErrorLog "logs/error.log" <IfModule log_config_module> CustomLog "logs/access.log" combined </IfModule> SSLEngine on SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL SSLCertificateFile "conf/ssl.crt/server.crt" SSLCertificateKeyFile "conf/ssl.key/server.key" <FilesMatch "\.(cgi|shtml|pl|asp|php)$"> SSLOptions +StdEnvVars </FilesMatch> <Directory "C:/xampp/cgi-bin"> SSLOptions +StdEnvVars </Directory> BrowserMatch ".*MSIE.*" nokeepalive ssl-unclean-shutdown downgrade-1.0 force-response-1.0 CustomLog "logs/ssl_request.log" "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b" </VirtualHost> <VirtualHost lmarket.local.domain.com:443> DocumentRoot "C:/xampp/htdocs/lmarket.local" ServerName lmarket.local.domain.com ServerAdmin [email protected] ErrorLog "logs/error.log" <IfModule log_config_module> CustomLog "logs/access.log" combined </IfModule> SSLEngine on SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL SSLCertificateFile "conf/ssl.crt/server.crt" SSLCertificateKeyFile "conf/ssl.key/server.key" <FilesMatch "\.(cgi|shtml|pl|asp|php)$"> SSLOptions +StdEnvVars </FilesMatch> <Directory "C:/xampp/cgi-bin"> SSLOptions +StdEnvVars </Directory> BrowserMatch ".*MSIE.*" nokeepalive ssl-unclean-shutdown downgrade-1.0 force-response-1.0 CustomLog "logs/ssl_request.log" "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b" </VirtualHost> If I invert these blocks, then the opposite happens: local.domain.com goes to lmarket.local.domain.com. Any help would be appreciated.

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  • Apache, mod_proxy_ajp and IE

    - by eduard-schnittlauch
    Hi! I have an Apache 2.2 using mod_proxy_ajp as a reverse proxy for a Tomcat 6, running on RHEL5. On tomcat runs an application that does NTLM authentication. Using Firefox, everything works ok, but IE7 says "cannot display the web page". Without Apache, IE7 works fine. What is going on here? Unfortunately, I have very limited access rights and can't capture tcp traffic or anything like that. Thanks!

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  • Configuring Postfix with other SMTP provider

    - by Eduard Luca
    I want to use SendGrid as my email sending service, but want to also use Postfix's internal queue mechanism to manage the emails sent through Sendgrid. So basically what I want to do is to configure Postfix to send emails through Sendgrid's SMTP, and I will configure my app to send the emails using the local Postfix. My question is, how can I configure Postfix to use an external SMTP? Looked here but didn't see anything useful.

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  • Howto configure openSuSE firewall to route local traffic to local ports

    - by Eduard Wirch
    I have openSUSE 11.3 installed. I'm using the openSUSE firewall configuration mechanism (/etc/sysconfig/SuSEfirewall2). I have a http server application running on port 8080. I want the http service to be accessible using port 80. I created a redirect rule usign: FW_REDIRECT="0/0,0/0,tcp,80,8080" This works fine for every request coming from external. But it doesn't for local requests. (example: wget http://myserver/) Is there a way how I can tell the firewall to redirect local requests addressed for 80 to port 8080? (using the SUSE firewall configuration file)

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  • *Simple* way to block DDoS by number of requests

    - by Eduard Luca
    I have 3 Varnish 3.0.2 servers with Apache 2 as backends, which are being load balanced through a HAproxy separate server. I need to find a very simple program (I'm not much of a sysadmin), which blocks requests from an IP, if that IP has made more than X requests in Y seconds. Would something like this be achievable with a simple solution? Right now I have to block all requests manually with iptables.

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  • Configure Supervisor to manage init.d services

    - by Eduard Luca
    I installed uwsgi and created a bash script, which allows me to start/stop uwsgi in the following manner: service uwsgi [start|stop]. This bash script is located in /etc/init.d/uwsgi. Now, I want to (politely) ask Supervisor to use that script to manage the uwsgi process. All the tutorials indicate that this is not the way to do it, however I do want to be able to do both service uwsgi stop and supervisorctl stop uwsgi (not sure if I nailed the syntax of the latter) -- even though I am aware that the first one will not in fact stop my service because supervisor will restart it (that's exactly what I need). Note that I'm using uwsgi in emperor mode if that matters in any way.

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  • Howto configure openSuSE firewall to route local traffic to local ports

    - by Eduard Wirch
    I have openSUSE 11.3 installed. I'm using the openSUSE firewall configuration mechanism (/etc/sysconfig/SuSEfirewall2). I have a http server application running on port 8080. I want the http service to be accessible using port 80. I created a redirect rule usign: FW_REDIRECT="0/0,0/0,tcp,80,8080" This works fine for every request coming from external. But it doesn't for local requests. (example: wget http://myserver/) Is there a way how I can tell the firewall to redirect local requests addressed for 80 to port 8080? (using the SUSE firewall configuration file)

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  • Ubuntu 12.04 open port 80 inside WLAN

    - by Eduard
    I have an nginx server running on ubuntu 12.04 that serves http through port 80 and https through port 443. Everything works fine if I access it from the same computer via localhost, 127.0.0.1 or the local IP 192.168.0.11. If I try to access the server from another computer in the same VLAN it does not work for http; it works for https. I have changed my nginx configuration to also listen to port 8000 for http; I can then access http from the other computer in the same VLAN via "http://192.168.0.11:8000". I also have a web server running on port 80 on a windows machine and can access it from another device in the same VLAN, therefore the router is not blocking incoming http traffic. The nginx process is run by root. I have used tcpdump and I see that packets are arriving to Ubuntu: 192.168.0.16.49735 192.168.0.11.80 and that some response is being given 192.168.0.11.80 192.168.0.16.49735 (I do not know what the response is though). There is no request arriving at the nginx web server (I have checked the access log). I have iptables empty. I have unsuccessfully tried to find a solution for a long time to this, it has now become a matter of happiness or bitterness :).

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  • How to declare dependent style names with UiBinder

    - by Eduard Wirch
    I have a simple UiBinder widget containing a TextArea: <!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent"> <ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder" xmlns:g="urn:import:com.google.gwt.user.client.ui"> <g:TextArea visibleLines="3" /> </ui:UiBinder> I want to control the background color of this textarea for writeable and read only states. GWT uses the "-readonly" style name decorator to achieve this. So I try this: <!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent"> <ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder" xmlns:g="urn:import:com.google.gwt.user.client.ui"> <ui:style> .textBoxStyle { background-color:yellow; } .textBoxStyle-readonly { background-color:lightgray; } </ui:style> <g:TextArea styleName="{style.textBoxStyle}" visibleLines="3" /> </ui:UiBinder> Obviously this won't work because style names are obfuscated for CssResources resulting in something like this: .G1x26wpeN { background-color:yellow } .G1x26wpeO { background-color: lightgray; } The result HTML for writeable textarea looks like this: <textarea tabindex="0" class="G1x26wpeN" rows="3"/> The read only textarea looks like this: <textarea tabindex="0" class="G1x26wpeN G1x26wpeN-readonly" readonly="" rows="3"/> How do I declare the style so GWT will obfuscate the primary part but not the "-readonly" decdorator? I know that I can disable the obfuscation for the entire style name. But I'd like to keep the obfuscation while making use of the decorators.

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