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• How to create a communication layer in android

  - by Palo

  I want to create a communication layer in android. The layer will communicate with server asynchronously. Multiple activities should be able to call methods of the communication layer. The layer will get messages from the server (it is not important for the scope of this question how) and should be able to tell activities to do some work based on these messages. How should I implement this? Should I do this using android Service? The main questions that I need to answer are: How can activities access the layer? How can the layer access activities? How can i make the communication layer live for the lifetime of the application?

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• Backup broken PostgreSQL 8.4 without pg_dump

  - by Daniil

  So. I have a problem. PostgreSQL 8.4 won't start or restart without any output given. But it worked for 3 monthes until hosting provider doesn't rebooted server. Now it is completly broken. It wan't start and doesn't give any output or log. pg_dump: [archiver (db)] connection to database "postgres" failed: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"? Now I want to backup (or just start pgsql socket) my database to reinstall postgesql. How?

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• How many layers is too many?

  - by Nathan

  As I have been learning about software development the last 2 years the more I learn, it seems the more gray areas I am running into. One gray area I have issues with right now is trying to decide how many layers an application should have. For example, in a WPF MVVM application what fashion of layering is ok? Is the following too separated? When I mention layering I mean creating a new class library for each layer. Presentation (View) View Model Business Layer Data Access Model Layer Utility Layer Or for a non MVVM application is this too separated? Presenation Business Data Access Model Layer Utility Layer Is acceptable to run layers together and just create folders for each layer? Any coloring of this gray area would be appreciated.

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• Can / how to install openSUSE as a GUI-less home server with only wifi?

  - by Dougal

  Hello there, I'm following an article to set up openSUSE as a commandline server (http://www.howtoforge.com/perfect-server-opensuse-11.1). It seems to only work for wired internet connections. Is there any way to install openSUSE as a commandline server in my home network but using a wifi internet connection? Preferably from the get-go and not simply installing with LAN cable internet and then installing some wifi things later. Or, perhaps, to rephrase the question "How can I get the openSUSE install / post-install procedure to recognize my wifi internet connection?" Kind regards, Dougal

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• Tmp issues with java service on windows 2008 service

  - by Mans

  Hello! I am having a rather nasty problem with windows 2008 server. We have a java application that is running as a service using the local services user. The problem is this user does not have access to read/write to the specified java tmp directory (specified by the system). This means that every time the application tries to create a tmp file an IOException is thrown. Is there any way to make a java application that need access to the tmp directory run as a service without: Creating a new user specifically for the purspose Specifying a new tmp directory (which you will have to clean up yourself)

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• Freezable DataContext

  - by grid-wpf-architect

  Hi, I have a customControl like ListView and I need to bind the sub property of my Custom Control to the visual tree element like below, <StackPanel> <TextBlock Text="Test" x:Name="txtBlock" /> <local:MyControl> <local:MyControl.Items> <local:MyControlItem Value ="{Binding ElementName=txtBlock, Path=Text}" /> </local:MyControl.Items> </local:MyControl> </StackPanel> I can access the object using Freezable object as the resource, but i want to inherit Freezable in my MyControlItem and access the Visual Tree.

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• Best way to split LAN computers on two WANs (not load balancing)

  - by lpfavreau

  What is the best way to split the computers of a LAN (about 50 computers) to go on two WANs, depending on the computers' IP address or computers' configuration (gateway). I'm not looking for load-balancing, I need to be able to route which computer uses which Internet connection. A solution would be to rewire the old office to split the two distinct groups that need to use two different Internet connections but I'm not sure it's worth it at the moment. I have a pfSense router configured with the LAN (DHCP), WAN1 and WAN2. I also have the IP addresses (and ability to configure) the next router on WAN1 and the one on WAN2. What would you suggest? Routing based on IP addresses ranges? Different gateways? VLANs would be difficult for the same reason as to why rewire is a bit complicated. Thanks!

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• Why do I have two different DNS suffix lists?

  - by Rob Kennedy

  My Windows XP laptop has two different DNS suffix lists. The first is the one I see by selecting the Properties dialog of any of my network connections, selecting Internet Protocol Properties Advanced DNS tab, and looking at the list under the "Append these DNS suffixes (in order)" option. The second list is the one shown under "DNS Suffix Search List" when I run ipconfig /all. As far as I can tell, only the second list ever gets used to resolve unqualified host names. Why are there two different lists? How do I configure the second list? Or how can I make my computer use the first list?

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• Brand New Monitor Won't Get Input From Computer

  - by HollerTrain

  I have an old Dell 2350. I found a HD a few months ago and plugged it in and it booted up. So I just purchased a monitor and plugged it in, and put the HD inside and connected the two connections (Bus, and a four pronged connector) and no signal is being sent to monitor. is this a monitor issue or the HD is just dead? HD is spinning. CPU is turned on :) Yet no signal.. any thoughts?

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• Production Instance : CLOSE_WAIT Connection Issue

  - by rajnikant

  I am using 10EC2 Instances behind 1 ELB. And ELB configured 80 to 8080 and 443 to 8080 port. And all 10EC2 instances having installed with Apache Tomcat, total request on ELB around 8000 to 10000 in 1 minute. I am facing problem for CLOSE_WAIT connection on 10 EC2 Instance, having Apache Tomcat. EC2 Instance Type : m1.xlarge When we restart the Apache Tomcat, all CLOSE_WAIT connections are lost, but its not proper way to work on Production Instances. Please help me out.

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• Reporting available RDP sessions

  - by Sergei

  Hi All Default Windows 2003 Server has two RDP sessions available.If all of them are taken by someone else you will only be notified about it after providing your credentials. This seems like a waste of time especially in our environment where we share a lot of development server. Could a message be given as soon as you open the connection window if the connections are taken up? We can use qwinsta based script to check sessions before logon but it's still takes time. Is there a feature to do what I am asking for?

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• static index.html file nginx

  - by Guntis

  We are using nginx with php-fpm. We plan to make first page static (generate html file). if we have 100 concurrent connections, how we can handle file regeneration? basically we need generate new file index_new.html, then delete index.html, and then move index_new.html to index.html. What happens when index.html file was deleted? User gets 404 error? Or nginx handles file from OS cache? One idea is to tell nginx, that 404 error is index_new.html and then not to move index_new to index, but copy. But i don't like idea about 404 error. Thanks.

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• E4X in ActionScript

  - by Brian Genisio

  Hey all, Looking at the E4X implementation in ActionScript, it occurs to me that they had to figure out how to do three things that I am not sure can be done within ActionScript regularly: Properties/Getters prefixed with @: var myAttribute = xmlPerson.@name; Nameless functions for filtering: xmlData.person.(/* predicate */) lambda syntax for predicates: xmlData.person.(@name == "Brian") So here is my question: Are these just one-off capabilities (much like Vector.<>) they put in just for E4X, therefore keeping out of reach for us? Or do we, as ActionScript developers, have access to these features? More specifically, I'd love to get access to the expression tree of that lambda predicate for my own code (not tied to the XML classes in any way). I figured out that this is called the "filter operator"... but I am not sure how to harness it. Not sure I can... since ActionScript does not allow for operator overloading :(

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• Building an application that includes a DB, and need recommendations

  - by Rubys

  I'm going to build a little system for personal use, and I want it to save data to a database. The language is going to be C#, and so I'd like to use this opportunity to get my head around LINQ to SQL. I have some DB experience and I know my SQL, but it was all in school using Access, which is giving me trouble, and so I'd like to use another DB, something that is small in size, easy to install, and should work with LINQ to SQL. The problem is: I don't know any except Access, and am looking for recommendations. To sum it up: I need a lightweight, easy to install, linq-to-sql supporting database for a small system on a home computer, any recommendations?

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• Computer cables explained

  - by Robert English

  I've noticed lately that places to learn about both power supply cables and also peripherals and fans aren't that easy to find. There's very little information available that gives detailed explanations of what cables are used inside a computer. What I found was very dated and often lacked detailed explanations. For someone planning out their first build it would be great way for this to be explained all in one place, like here! Important things to know about cables and connections in a computer? What are their names? Where do they connect to and why? What typical Voltages do they output? Changing Voltages for Overclocking? Please refernce PSU cables(Full modular, Modular and Non-Modular,24-pin, 20+4-pin etc), SATA(I, II, III), Molex etc. EDIT: Forgot to mention any information about PSU rails would also be appreciated :)

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• Secure database connection. DAL .net architecture best practice

  - by Andrew Florko

  We have several applications that are installed in several departments that interact with database via Intranet. Users tend to use weak passwords or store login/password written on a shits of paper where everybody can see them. I'm worried about login/password leakage & want to minimize consequences. Minimizing database-server attack surface by hiding database-server from Intranet access would be a great idea also. I'm thinking about intermediary data access service method-based security. It seems more flexible than table-based or connection-based database-server one. This approach also allows to hide database-server from public Intranet. What kind of .net technologies and best practices would you suggest? Thank in you in advance!

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• require_owner code to limit controller actions not recognizing current user as owner

  - by bgadoci

  I am trying to restrict access to certain actions using a before_filter which seems easy enough. Somehow the ApplicationController is not recognizing that the current_user is the owner of the user edit action. When I take the filter off the controller correctly routes the current_user to their edit view information. Here is the code. Link to call edit action from user controller (views/questions/index.html.erb): <%= link_to "Edit Profile", edit_user_path(:current) %> ApplicationController (I am only posting the code that I think is affecting this but can post the whole thing if needed). class ApplicationController < ActionController::Base def require_owner obj = instance_variable_get("@#{controller_name.singularize.camelize.underscore}") # LineItem becomes @line_item return true if current_user_is_owner?(obj) render_error_message("You must be the #{controller_name.singularize.camelize} owner to access this page", root_url) return false end end and the before_filter class UsersController < ApplicationController before_filter :require_owner, :only => [:edit, :update, :destroy] #... end I simply get the rendering of the error message from the ApplicationController#require_owner action.

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• Amazon ELB and use of address / server names across multiple servers

  - by Stpn

  I am setting up Nginx servers behind the ELB. I set up so that api.app.com points to an ELB. I wonder which addresses I should use for remote connections, Nginx settings etc.. 1) For example, in Nginx: Should I do server { listen 80; #What is the right line here: # server_name <WWW.NAME.COM> OR <ec2-.....compute-1.amazonaws.com> OR <MLB-....amazonaws.com>?; passenger_enabled on; ..... } 2) I connect servers behind ELB to remote Postgres database. In Postgres settings should I open the ELB address (MLB-...amazonws.com) or to individual EC2 IPs?

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• Trapping events within list box item templates in WPF

  - by AC

  I've got listbox that employs an item template. Within each item in the list, as defined in the template there is a button. When the user clicks the button I change a value in the data source that defines the sort order of the list. Changing the datasource is not a problem as this is working just fine within my application template. However my next step is to reload the listbox with the new sorted data source. I've tried doing this from the tempalte but it apparently doesn't have access (or I can't figure out how to get access) to the parent elements so I can reset the .ItemSource property with a newly sorted data source. Seems like this is possible but the solution is eluding me :(

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• How can I use Amazon's API in PHP to search for books?

  - by TerranRich

  I'm working on a Facebook app for book sharing, reviewing, and recommendations. I've scoured the web, searched Google using every search phrase I could think of, but I could not find any tutorials on how to access the Amazon.com API for book information. I signed up for an AWS account, but even the tutorials on their website didn't help me one bit. They're all geared toward using cloud computing for file storage and processing, but that's not what I want. I just want to access their API to search info on books. Kind of like how http://openlibrary.org/ does it, where it's a simple URL call to get information on a book (but their databases aren't nearly as populated as Amazon's). Why is it so damned hard to find the information I need on Amazon's AWS site? If anybody could help, I would greatly appreciate it.

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• Tools for analyzing performance of SQL Server/Express?

  - by Adam Crossland

  The application that I have customized and continue to support for my client is seeing dramatic performance problems in the field. Simple queries on rather small datasets take over a minute when I would expect them to complete with sub-second times. My current theory is that SQL Server Express 2005 is too limited for the rather non-trivial demands being made of it, but I am not sure how to get about gathering data that I can use to either prove my point or allow me to move on to finding another cause. Can anyone point me toward some tools that would allow me to analyze the load on this database? Information such as simultaneous connections, execution times of individual queries, memory usage, heck just any profiling data at all would be a help. Many thanks.

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• Is there anything that can be done to make X forwarding over LAN less painful?

  - by Earlz

  I have two *nix machines that I like to remotely do graphical things sometimes with. One of those machines is my Arch Linux media server, and another is my OpenBSD router/general server. My current task was installing a Windows XP over virtual box on my media server. I preferred to do the installation from my main workstation so that I could continue to watch TV from my media server on it's "actual" display. I soon noticed that X forwarding is quite painful though, even over low-latency LAN connections. Are there any settings I can tweak to make it a bit less painfully slow, jittery, and laggy? My LAN is rather small, 100Mbit, and ping times to the other box average at about 0.15ms. Also, I know Virtualbox has a VNC mode it can use instead of doing X forwarding, but this particular task was just an example

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• Is there a software package that safely allows SSH via web on simple web host?

  - by spoulson

  I want to be able to use a secured web page on my shared web host to make SSH connections out to any destination. A shared web host is cheap and easy to maintain, and usually allows ssh to the web server. There are times I'd like to ssh into my web server, but don't have direct ssh connectivity. I'm aware of consoleFISH, Ajaxterm, and Anyterm. The problem is consoleFISH is a man-in-the-middle by design, and Ajaxterm/Anyterm require running a daemon process on the hosting server. Web hosts can usually support cron jobs, but not continuously running daemon processes. Additional Apache modules are usually out, too, as they require reconfiguration of the server and affects all other customers. Are there any software packages out there I can run on my shared web hosting account that provide a true ssh experience with these limitations?

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• Setting up WAMP to run on a LAN

  - by Steve

  I've installed WAMP on a Windows 7 PC, and it is running fine locally, as localhost. I want PCs on the LAN to be able to view the local server. When they load my PC's IP address in their browser, they receive a "You don't have permission to access / on this server" error. I followed this guide, but the issue remains. To recap: I've added an inbound exception to Windows Firewall for port 80 for Private and Domain connections. I've edited Apache's httpd.conf to include: Listen 80 Listen 192.168.0.5:80 < Directory "c:/wamp/www/wordpress/" allow from all < /Directory I've edited httpd-vhosts.conf to include: < VirtualHost 192.168.0.5:80 DocumentRoot "C:/wamp/www/wordpress" < /VirtualHost Any ideas?

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• how change nginx temp & log folder or disable logging completely

  - by Ehsan Khodarahmi

  I'm running nginx 1.3.5 under windows seven, I need to execute nginx directly from a read-only media (CD or DVD), but when I want to run it, it fails with this error: nginx: [alert] could not open error log file: CreateFile() "logs/error.log" fail ed (5: Access is denied) 2012/08/28 13:52:46 [emerg] 5604#2864: CreateDirectory() "J:\nginx-1.3.5/temp/client_body_temp" failed (5: Access is denied) where J is my CD-ROM drive letter. I've changed nginx.conf to disable logging completely, but seems anyway it still tries to build a file named 'error.log' in '/logs' folder & some extra temporary contents in '/temp' folder at the startup, so I want to change 'logs' & 'temp' directory path to windows temp folder (%temp%), but I dont have any idea that how can I do it. Also I want to know why nginx still creates 'logs/error.log' after disableing error logging ?

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