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  • How do I swap two objects in a GC language without triggering GC?

    - by TenFour04
    I have two array lists. that I want to swap each frame. My question is, does the variable 'temp' need to be a member variable to avoid triggering GC, assuming this method is called on dozens of objects each frame? I'm not creating a new object, just a new reference to an object. public void LateUpdate(){ ArrayList<int> temp = previousFrameCollisions; previousFrameCollisions = currentFrameCollisions; currentFrameCollisions = temp; currentFrameCollisions.clear(); } I've been told there's no reason to make a primitive into a member variable just to avoid GC, so my best guess is that this also applies to object references.

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  • How to remove a page from site without affecting google serp

    - by Savas Zorlu
    I have a travel website. Just for information purposes, I had put a weather page. Now I realize that this page is increasing my overall bounce rate; because people who are looking for the weather forecast are landing on that page and getting what they want and exiting. What is the safest method to get rid of that page? Would it hurt my google rank if I remove it completely? Or is there a better way to handle this situation? I realize that around 21 percent of my daily hits are on that page. I would have been happy if my aim was to provide weather data for the location; however, my site needs to focus on selling hotels. So I think I need to get rid of this weather page immediately. What do you think?

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  • How to create a scripted sequence

    - by igrad
    Like countless other video games, I'd like to have scripted sequences in my game. Character 1 says something, the player replies, then a rock falls, that sorta stuff. I could find a way to do it, but I would like to use a common method, assuming there is one. My current thought is to have a separate file for each level of the game that contains all the possible scripted actions for that level. When the corresponding trigger is activated, the function is called. I think early Call of Duty games (up to CoD4) used something similar, but I'm not entirely sure.

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  • A Better Way To Extract Date From DateTime Columns [SQL Server]

    - by Gopinath
    Quite a long ago I wrote about a SQL Server programming tip on how to extract date part from a DATETIME column. The post discusses about using of T SQL function convert() to get date part. One of the readers of the post, tipped me about a better way of extracting date part and here is the SQL query he sent to us SELECT DateAdd(day, DateDiff(day, 0, getdate()), 0); In clean way this query trims off time part from the DATETIME value. I rate this solution better than the one I wrote long ago as this one does not depend on any string operations. According the commenter, this method is faster compared to the other. What do you say? Thanks Yamo This article titled,A Better Way To Extract Date From DateTime Columns [SQL Server], was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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  • Getting collision detection in Pygames

    - by user36010
    I am writing a game in Pygame, I want to get collision detection. The aim is when a object hits another, the target object disappears. I want to avoid having classes and just have my code class less for now, in one script. This makes it difficult to get collision detection because the Rect method in Pygame is called on by an object(class). The logic I want to achieve is: object hits a target object target object disappears. is there an easy way to achieve this?(with minimal code possible)

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  • Scalability of multi-threading in game server

    - by Taylor Hill
    What is a reasonable number of threads for a simple 2D mmo in Java? Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is because I use a blocking method on the input stream, and a workaround seems unnecessarily complex if I were to try to get around it without adding threads. This is mostly for my own edification; I don't expect to have 5 million people playing it ever, or even 5, but I'm wondering what a good scalable solution is, and if this is reasonable for a small server (<30 connections).

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  • How to use iptables to forward all data from an IP to a Virtual Machine

    - by jro
    OK, in an attempt to get some response, a TL;DR version. I know that the following command: iptables -A PREROUTING -t nat -i eth0 --dport 80 --source 1.1.1.1 -j REDIRECT --to-port 8080 ... will redirect all traffic from port 80 to port 8080. The problem is that I have to do this for every port that is to be redirected. To be future-proof, I want all ports for an IP to be redirected to a different (internal) IP, so that if one might decide to enable SSH, they can directly connect without worrying about iptables. What is needed to reliable forward all traffic from an external IP, to an internal IP, and vice versa? Extended version I've scoured the internet for this, but I never got a solid answer. What I have is one physical server (HOST), with several virtual machines (VM) that need traffic redirected to them. Just getting it to work with a single machine is enough for now. The VM's run under VirtualBox, and are set to use a host-only adapter (vboxnet0). Everything seems to work, but it is greatly lagging. Both the host (CentOS 5.6) and the guest (Ubuntu 10.04) machine are running Linux. What I did was the following: Configure the VM to have a static IP in the network of the vboxnet0 adapter. Add an IP alias to the host, registering to the dedicated (outside) IP. Setup iptables to allow traffic to come through (via sysctl). Configure iptables to DNAT and SNAT data from a given IP address to the internal address. iptables commands: sudo iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT sudo iptables -A POSTROUTING -t nat -j MASQUERADE iptables -t nat -I PREROUTING -d $OUT_IP -I eth0 -j DNAT --to-destination $IN_IP iptables -t nat -I POSTROUTING -s $IN_IP -o eth0 -j SNAT --to-source $OUT_IP Now the site works, but is really, really slow. I'm hoping I missed something simple, but I'm out of ideas for now. Some background info: before this, the site was working with basic port forwarding. E.g. port 80 was mapped to port 8080 using iptables. In VirtualBox (having the network adapter configured as NAT), a port forwarding the other way around made things work beautifully. The problem was twofold: first, multiple ports needed to be forwarded (for admin interfaces, https, ssh, etc). Second, it only allowed one IP address to use port 80. To resolve things, multiple external IP addresses are used for different (sub)domains. Likewise, the "VirtualBox" network will contain the virtual machines: DNS Ext. IP Adapter VM "VirtalBox" IP ------------------------------------------------------------------ a.example.com 1.1.1.1 eth0:1 vm_guest_1 192.168.56.1 b.example.com 2.2.2.2 eth0:2 vm_guest_2 192.168.56.2 c.example.com 3.3.3.3 eth0:3 vm_guest_3 192.168.56.3 And so on. Put simply, the goal is to channel all traffic from a.example.com to vm_guest_1 (of put differently, from 1.1.1.1 to 192.168.56.1). And achieve this with an acceptable speed :).

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  • Results stored in a session - good idea?

    - by Nick
    To give a bit of background, lets say it's a generic results page, which is paginated so there are X results per page. Generally to do this, I have two queries on the page: to get the total number of results to get the results, limiting by the correct page's resultset However, recently I've been trying to cut down on the queries the site is making, and I thought one way to do this would be to only do the query if any parameters to the page have changed (except of course the page number)? This would then cache all the result id's in a session, which can be sliced when I need to return the correct resultset for that page. I was trying to look around the net to see if there are downsides of this method, but I've found very little information about it. Has anyone done this before? Is it a good idea?

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  • Exchange Server 2007 Send and Receive Connectors

    - by Mistiry
    I have gotten awesome advice from users on here for getting Exchange on Windows SBS 2008 set up. I think this is the final piece and I'm ready for roll-out! I need to set up Exchange so that it RECEIVES mail from our existing mail server as a Forward [aliases on the existing mail server to forward mail from [email protected] to [email protected]] (not using the POP3 Connector), and SENDS mail through that server as well (sends from [email protected] to [email protected] and then out to the world, showing in the headers as from [email protected] or at absolute least have the reply-to set as this). Alternatively, as long as the .net email address doesn't show in the From and replies are directed to the .com account, email can go from Exchange to the outside world without directing through the existing mail server. External Domain: domain.com Internal Domain: domain.local Internet Domain Name Set in SBS Console: domain.net When I go to http://remote.domain.net I get the Remote Web Workspace, and can login to both Sharepoint and OWA. I can send an email from OWA to a GMail account. I receive it from [email protected], which is an alias of [email protected]. I cannot, however, send an email from OWA to ANY domain.com email addresses. I am also not receiving any email to this Exchange account (except for NDRs). When I try sending an email to a domain.com account, here is the error (I had to replace all < and with { and }): Delivery has failed to these recipients or distribution lists: [email protected] The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator. Generating server: IFEXCHANGE.domain.local [email protected] #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ## Original message headers: Received: from IFEXCHANGE.domain.local ([fe80::4d34:abc5:f7fd:e51a]) by IFEXCHANGE.domain.local ([fe80::4d34:abc5:f7fd:e51a%10]) with mapi; Tue, 17 Aug 2010 14:14:14 -0400 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: binary From: John Doe {[email protected]} To: "[email protected]" {[email protected]} Date: Tue, 17 Aug 2010 14:14:12 -0400 Subject: asdf Thread-Topic: asdf Thread-Index: AQHLPjf+h6hA5MJ1JUu1WS4I4CiWeA== Message-ID: {E4E10393768D784D8760A51938BA456A029934BA30@IFEXCHANGE.domain.local} Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: {E4E10393768D784D8760A51938BA456A029934BA30@IFEXCHANGE.domain.local} MIME-Version: 1.0 I hope I explained the situation well enough for someone to be able to explain to me what I'm missing. If I could, I'd be putting a 10K bounty, but unfortunately I've got only 74 reputation (hey, I'm a newbie here!). I'm pretty sure the obvious "RecipNotFound" error is why its not working, my question is how to resolve this. The email account exists, it receives mail just fine, yet when I send it from the Exchange server it fails. EDIT In OC-Hub Transport, the Email Address Policies has 2 entries. "Windows SBS Email Address Policy" is set up to: Include All Recipient Types, no conditions, and SMTP %[email protected]. "Default Policy" set to: Include All Recipient Types, no conditions, and SMTP @domain.net. Three Authoritative Accepted domains domain.com domain.local (Default) domain.net Remote Domains tab has two entries. Default with domain * Windows SBS Company Web Domain with domain companyweb.

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  • How can I add a Google search box to my website? [migrated]

    - by wahle509
    I am trying to add a Google search box to my own website. I would like it to search Google itself, not my site. There was some code I had that use to work, but no longer does: <form method="get" action="https://www.google.com/search"> <input type="text" name="g" size="31" value=""> </form> When I try making a search, it just directs to the Google homepage. Well, actually it directs here: https://www.google.com/webhp Does anyone have a different solution? What am I doing wrong?

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  • Thread count in Java game

    - by Taylor Hill
    I'm just curious as to what a reasonable number of threads is for a simple 2D mmo in Java. Is it reasonable to have two threads per connection, one for the input stream and one for the output stream? The reason I ask is because I use a blocking method on the input stream, and a workaround seems unnecessarily complex if I were to try to get around it without adding threads. This is mostly for my own edification; I don't expect to have 5 million people playing it ever, or even 5, but I'm wondering what a good scalable solution is, and if this is reasonable for a small server (<30 connections).

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  • HTTP resource bundling/streaming practice

    - by icelava
    Our SPA (plain HTML and Javascript) makes use of huge volume of javascript and other resources that are downloaded via XHR. Given the sheer number of components and browser simultaneous request limits, we're thinking for ways to deliver our resources in a more efficient manner. A method we're considering is bundling several resources that logically form a coherent group into a single file; thus reducing down to only one XHR (per group). Furthermore to make it more responsive, we'd like to constantly inspect the partial responseText during the LOADING state, determining if a usable chunk (atomic resource) has already been downloaded, and make it available for deserialization/processing even before the XHR is DONE. (a stream-like experience) We're thinking surely somebody else would've considered roughly the same approach before, but haven't really come across any library/framework or container file format that is suitable for our scenario. Anybody else know of something similar?

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  • sprite group doesn't support indexing

    - by user3956
    I have a sprite group created with pygame.sprite.Group() (and add sprites to it with the add method) How would I retrieve the nth sprite in this group? Code like this does not work: mygroup = pygame.sprite.Group(mysprite01) print mygroup[n].rect It returns the error: group object does not support indexing. For the moment I'm using the following function: def getSpriteByPosition(position,group): for index,spr in enumerate(group): if (index == position): return spr return False Although working, it just doesn't seem right... Is there a cleaner way to do this? EDIT: I mention a "position" and index but it's not important actually, returning any single sprite from the group is enough

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  • Observer Pattern Implementation

    - by user17028
    To teach myself basic game programming, I am going to program a clone of Pong. I will use the Observer design pattern, with an interface between the input and the game engine. However, I'm not sure what the interface should do. One idea I had was for the input interface to tell the game engine that (e.g.) the screen was clicked, then to let the game engine decide what to do with that information (shoot a bullet, for example). Another idea I had was for the input interface, having caught the mouse click, to tell the game engine to shoot a bullet. Which method would be better for me to use?

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  • xUnit global setup / teardown [migrated]

    - by Codism
    I need to run some code before any test is executed and also some code after all tests are done. I thought there must be some attributes or marker interface to indicate the global initialization and termination code but couldn't find them. Alternatively, if I can invoke xUnit programmatically, I can also achieve what I want to do by the following code: ... Main(string[] args) { try { MyGlobalSetup(); RunAllTests(); // What goes into this method? } finally { MyGlobalTeardown(); } } Can anyone provide me some hint about how to declaratively or programmally run some global setup/teardown code? Thanks

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  • What is this called?

    - by robertlewis2001
    I'm hoping there's a book or something out there for me to get... If I have a class that has Collection as an instance variable, what is that method of coding called? A design pattern? If so, where can I find more information on it? As I've been working with this mentor, he's really helped me understand my programming weakness and that weakness is thinking in terms of collections or relationships between objects. It just seems so difficult for me right now and I need to read to become smarter. My mentor is a great guy, but he gets frustrated when I start asking lots of questions, so I'm starting to feel like I need to learn more on my own. public class Evaluation { private List<Criterion> criterion = null; public Evaluation() { criterion = new List<Criterion>(); } }

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  • Benefits of TOGAF or similar?

    - by Lunatik
    I can read the website blurb and be impressed by the alleged benefits, but I haven't worked anywhere or with anyone who followed the TOGAF (or any alternative) architecture framework. Our organisation has declared itself dedicated to moving from what is currently a fairly shambolic design & development model towards something approaching a modern structured process. Things like TOGAF have been mentioned as helping achieve a world-class enterprise development environment (!) but I'm convinced that no-one here really understands the real-world benefits that wholesale adoption might bring and, perhaps more importantly, the effort/pain required to achieve the same. Do you have experience in using TOGAF or similar to wrestle control in an organisation? Do you think that use of the framework brought any benefit? Edit: For clarification TOGAF is "The Open Group Architecture Framework", a detailed method and set of tools for developing an enterprise architecture. See: http://www.opengroup.org/architecture/togaf8-doc/arch/

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  • O'Reilly Deal of the day - 10/June/2012 - Introducing HTML5 Game Development

    - by TATWORTH
    Today's deal of the day from O'Reilly at http://shop.oreilly.com/product/0636920022633.do?code=DEAL is Introducing HTML5 Game Development"Making video games is hard work that requires technical skills, a lot of planning, and—most critically—a commitment to completing the project. With this hands-on guide, you’ll learn step-by-step how to create a real 2D game from start to finish. In the process, you’ll use Impact, the JavaScript game framework that works with HTML5’s Canvas element. Not only will you pick up important tips about game design, you’ll also learn how to publish Impact games to the Web, desktop, and mobile—including a method to package your game as a native iOS app. Packed with screen shots and sample code, this book is ideal for game developers of all levels."

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  • Tile transitions - external vs internal

    - by omgnoseat
    I've been looking at a couple of games and noticed that the transitions between tiles are handled somewhat different. I was wondering which methods are to be used in different situations and why. I'm currently using internal edges in a top-down game, and it's working out so far. But I don't want to run into problems later on, and have to redo the whole tileset. I noticed that platforming games mostly use the internal edges, and top-down games mostly use external and hybrid transitions. I can see how these tiles are used to create "depth" in top-down games, where the player apears to be standing in front of a wall for example. But it seems unlikely that such a small feature decides the entire method for tile transitions. You could always alter the bounding box to create the same effect.

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  • Dump an arbitrary object To Html String

    - by Michael Freidgeim
    For debugging purposes me and my collegue wanted to dump details of the arbitrary object, and created function that uses LINQPad Dump functionality (thanks to http://stackoverflow.com/a/6035014/52277 and original http://linqpad.uservoice.com/forums/18302-linqpad-feature-suggestions/suggestions/447166-make-dump-extension-method-available-in-visual-s discussion)    public static string DumpToHtmlString<T>(this T objectToSerialize)        {            string strHTML = "";            try            {                var writer = LINQPad.Util.CreateXhtmlWriter(true);                writer.Write(objectToSerialize);                strHTML = writer.ToString();            }            catch (Exception exc)            {                Debug.Assert(false, "Investigate why ?" + exc);            }            return strHTML;        }You will need to add the linqpad executable as a reference in your project.TO DO similar in plain text ,look at https://github.com/ServiceStack/ServiceStack.Text StringExtensions , e.g. JsonSerializer/CsvSerializer or http://objectdumper.codeplex.com/

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  • How can I programmatically block user input for a given time?

    - by black_puppydog
    As a person working in computer science working offline to avoid facebook and thelike is not always (meaning hardly ever) possible for me since I mostly have to be online to work. I have tried leechblock and similar things but the problem becomes that at some point I start making systems for myself to hack, which is kind of pointless if oyu have root. I would very much like to try out the method described here. (Short version: reboot your PC every time finish a task or get bored with it) Unlike for the author of this blog my work is mainly done not in screen sessions but in IDEs ans other not-so-fast-to-start-up stuff, meaning a full reboot including loading all my programs will take its time. So, the question is: How can I block all user input and preferrably blank the screen for a given amount of time? The idea would then be to have a keyboard shortcut to activate the script/program (which would probably also have to have root i guess?)

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  • Why can't my jsp page read chinese chars from mysql? [migrated]

    - by Canking
    The mysql chars is utf-8, and the jsp page is also set to utf-8. I use the method: DriverManager.getConnection("jdbc:mysql://localhost:3306/jsptest?"+"useUnicode=true&characterEncoding=UTF-8","root",""); But it can not be use. When I insert Chinese chars into mysql and select it out, that would be proper functioning. The question is when I select some Chinese chars that I write into mysql at first, it would be all the "?" at the Chinese char place! Please watch the picture:

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  • WPF Release History : Q1 2010 SP1 (version 2010.1.0422)

    Q1 2010 SP1 Changes: RadGrid Important Changes: The enumerator of RadGridView.Items now enumerates data items only (use RadGridView.Items.Groups to retrieve group items). What's New: Added support for BorderBrush and BorderThickness for GridViewRow. Editable field filter logical composition operator (And/Or). New overload of the GridViewDataContro.GetDistinctValues method that accepts the number of distinct values to return as a parameter. Group footer row now uses its Item as aggregate...Did 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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  • How do I create stand alone packages from ubuntu repository

    - by tachyons
    Is it possible to create a stand alone deb packages by merging dependancies without manual repacking.?? I've looked at this question but it doesn't really answer what I'm trying to achieve above. if possible how to do it? update 1 No tools available yet(?) So what about creating new deb package containing all packages which will copy dependencies to the cache and executing main package. Is it possible? update 2 Above method appears to be impossible because dpkg cant handle more than one operation at a time. Some scripts may can do it update 3 this tool is very helpful but it currently wont support oneric and above still waiting for more generic tool Thanks in advance

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  • OpenGL: Drawing to a texture

    - by Danran
    Well im just a bit stuck wondering how to draw an item to a texture. Specifically, i'm using; glDrawArrays(GL_LINE_STRIP, indices[0], indices.size()); Because what i'm drawing via the above function updates every-frame, i'm just totally not sure how to go about drawing what i have to a texture. Any help is greatly appreciated! Edit: Well unfortunately my graphics card doesn't support FrameBuffer Objects :/. So i've been trying to get the copy contents from backbuffer method working. Here's what i currently have; http://pastebin.com/dJpPt6Pd And sadly all i get is a white square. Its probably something stupid that i'm doing wrong. Just unsure what it could be?

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