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  • Adding multiplayer to an HTML5 game

    - by espais
    I am interested in making a game that I currently have a co-op experience, however I'm curious as to the best method of implementing this in HTML5. I have made games before using straight C sockets, and also with the Net library for SDL. What are some of my best options for doing this in a canvas-based environment? At present, all I can come up with are either AJAX/database solutions (with a high refresh rate), or somehow implementing a PHP server that would funnel the data through sockets. The overall gameplay would be a 2.5D platformer-ish type of game, so both clients would need to be continually updated with player positions, enemy positions, projectiles, environmental data, etc.

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  • Performance impact of not implementing relationships at the database level?

    - by JVerstry
    Let's imagine a data model with customers and invoices. There is a 1 to n relationship between a customer and its invoices. We uses an ORM (like Hibernate). One can explicitely implement the 1-n relationship (using JPA for example) or not. If not, then one must do a bit more work to fetch invoices. However, it is much easier to maintain, improve and develop the data model of applications where relationships between objects are not explicitely implemented in the database. My question is, has anyone noticed a significant performance impact when not implementing the relationships in the database?

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  • Coherence on Exalogic: 6x Speeds on Half the Hardware is Possible

    - by jeckels
    Recently, Oracle Coherence released its 12c version, focused on scalability and real-time data delivery. As part of the launch, we showcased Coherence's tight coupling with Exalogic Elastic Cloud. By leveraging the Inifiniband Fabric in Exalogic, Coherence can now operate at up to 6x the speed on as little as half the hardware on an Exalogic box. This breakthrough is helping customers save money on their hardware costs while improving performance of their data grid. Here's a free resource available for you to explore this technology relationship further.For even more information on Coherence, attend our upcoming free virtual developer day on November 5th to see how developers can leverage Coherence in their everyday tasks.

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  • As a Qt GUI programmer, how to improve (career & skill)?

    - by linjunhalida
    hello, I'm a python & Qt programmer, and my daily job is create small PC GUI programs ship with hardware devices. the problem is, My job is simple, read/write data to device by using serial port(pyserial), display and edit data(PyQt + PyQwt), that's all. although I'm a linux user, my program is running under windows XP, but thanks to PyQt, I can still develop under linux. And I'm always afraid of being replaced by the people cheaper and younger than me in the future. (I'm 26 now.. not too much time for playing..) So I need improve myself, and make me more competitive in the global market, and I like programming, and want coding till the end of my life. any roadmap suggestion?

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  • Does setting document.domain via script interfere with Google Analytics?

    - by Seth Petry-Johnson
    I have a site, www.example.com, that displays some secure content from forms.example.com in iframes. To enable cross-frame navigation, pages on both sites use JavaScript to set the document.domain to just "example.com". I am using Google Analytics on www.example.com, but the GA site is not showing any data. It indicates that the tracking code is found (the status icon is a green checkmark), but no data is reported. The GA profile lists the website as "www.example.com". Is this a supported scenario? Is my script interfering with the GA code in some way?

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  • How do I decide to which class a method should belong

    - by Eleeist
    I have TopicBusiness.class and PostBusiness.class. I have no problem with deciding into which class methods such as addPostToDatabase() or getAllPostsFromDatabase() should go. But what about getAllPostsFromTopic(TopicEntity topic) or getNumberOfPostsInTopic(TopicEntity topic)? Should the parameter be the deciding factor? So when the method takes TopicEntity as parameter it should belong to TopicBusiness.class? I am quite puzzled by this. EDIT: Some more info as requested. TopicBusiness.class and PostBusiness.class are classes holding all the business logic of the application concerning topics and posts respectively - that is fetching the data from database and/or performing some operations on them. TopicEntity is data (in this case representing single topic) fetched from database. getAllPostFromTopic(TopicEntity topic) gets all posts from database that belong to particular topic, while getNumberOfPostsInTopic(TopicEntity topic) performs database query and returns the number of posts that topic passed as parameter consists of.

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  • Which graphics library should I be using?

    - by DaveDev
    I have been developing and maintaining a WPF application, for which I've recently been tasked with adding a 3D representation of some of the data. I'm new to graphics programming in every kind of way so I'm curious whether I should stick with 3D graphics capabilities built into WPF or should I investigate other solutions, like OpenTK or SharpGL My objective is to represent the data so that it will eventually appear similar to: with nodes connected by lines. I need to rotate the image around each axis and each node will be a 3D model of the device it represents. So far, I've been able to experiment with the tutorial outlined here: Windows Presentation Foundation (WPF) 3D Tutorial and it was helpful as an introduction. But I can see that there are other ways to implement 3D graphics solutions and I wonder if they are more suitable for my needs, or should I stick with the in-built WPF solution? What are the pros and cons of each?

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  • How can I designed multi-threaded application for larger user base

    - by rokonoid
    Here's my scenario, I need to develop a scalable application. My user base may be over 100K, every user has 10 or more small tasks. Tasks check every minute with a third party application through web services, retrieving data which is written in the database, then the data is forwarded to it's original destination. So here's the processing of a small task: while(true){ Boolean isNewInformationAvailable = checkWhetherInformationIsAvailableOrNot(); If(isNewInformationAvailable ==true){ fetchTheData(); writeToDatabase(); findTheDestination(); deliverTheData(); isAvailable =false; } } Here is the question: as the application is large, how should I approach designing this. I'm going to use Java to write it. Should I use concurrency, and how would you manage the concurrency?

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  • Cloud consolidation handling multi databases

    - by llaszews
    I have spoken about virtualization and the different types of virtualization. Which includes OS zones, application server domains, database schemas, VLANS and other approaches. Another approach is to create a virtually federated database in the cloud. DBSpaces is a company that has a technology to created a virtually federated database in the cloud. DBSpaces is a Virtual Database technology that allows an organisation thru a single Virtual Database access multiple data sources (or database spaces) in real-time. Additionally dbSpaces can be configured to access an organisations data internally using a remote gateway so that their dbSpace is seamless across the Public and Private cloud.

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  • Set modified date = created date or null on record creation?

    - by User
    I've been following the convention of adding created and modified columns to most of my database tables. I also have been leaving the modified column as null on record creation and only setting a value on actual modification. The other alternative is to set the modified date to be equal to created date on record creation. I've been doing it the former way but I recent ran into one con which is seriously making me think of switching. I needed to set a database cache dependency to find out if any existing data has been changed or new data added. Instead of being able to do the following: SELECT MAX(modified) FROM customer I have to do this: SELECT GREATEST(MAX(created), MAX(modified)) FROM customer The negative being that it's a more complicated query and slower. Another thing is in file systems I believe they usually use the second convention of setting modified date = created date on creation. What are the pros and cons of the different methods? That is, what are the issues to consider?

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  • Microformats, Reviews and Duplicate Content

    - by Nicholas
    Let's say I have a site that sells widgets, and the URL structure is like so: /[type-of-widget]/[sub-type]/[widget-name]/ So, a URL for a widget might be: /screwdrivers/philips-screwdrivers/acme-big-screwdriver/ We show reviews on the widget page, and use the appropriate microformat data so Google knows it's a review, etc. Now, what if I want to show random reviews in the "sub-type" and "type-of-widget" landing pages? Will Google ding me for duplicate content, or is it smart enough to know (based on microformat data/etc.) that this is not duplicate content?

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  • Where can I learn to write my own database?

    - by Buttons840
    I'm interested in writing my own database - a triple-store. Are there any good resources to help with the challenges of such a project? Or more generally: How can I learn to write my own database? Some specific issues I'm unsure of: How is the data actually stored on the file-system? A flat-file seems easy enough, but a database is a lot more then a flat-file. What kinds of things are typically stored (or cached) in memory? How are indexes created and stored? How is ACID compliance achieved? Etc. This is a big topic, but knowing how to store large amounts of data in a reliable way is good to know. (My investigation into existing triple-stores was summarized back in 2008; not much has changed in 4 years it seems. This is why I want write my own.)

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  • Exadata - Following up on customer deployments

    - by Carlos M. Orozco -Oracle
    Over the last year or so I've been visiting customers who have had Exadata deployed and have been enjoying the benefits the platform has been providing. Benefits include greater performance, consolidating multiple databases, data compression and time to value improvements. Most often I hear my reports run faster. One hospitality company report times that used to take 3 hrs now run in 12 seconds. Another services company reported all their batch reports taking 11hrs now run in 38 mins. Also reported that their transactions post faster, and batch updates run faster. So what does that mean? For most of them it means that now they have a platform that can handle growth. Most are growing 15% organically, but I've also seen 40% growth thru acquisition. Exadata has been keeping up with the additional data demand by customers leveraging compression and the smart storage features.

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  • How to execute? [closed]

    - by Viswa
    Possible Duplicate: how to read the password from variable? I did the below code in my python script,but its not work. #! /usr/bin/python import os address = "rsync -avrz [email protected]:/opt/script/python/data/ /opt/script/python/data/" passwd ="my server password" os.system('%(address)s "echo %(passwd)s"' %locals()) it throws below error. If arg is a remote file/dir, prefix it with a colon (:). rsync error: syntax or usage error (code 1) at main.c(1236) [Receiver=3.0.7] If i run os.system('%(address)s' %locals()) means it work without any error but it ask password. I need that password should be read from my passwd variable. How to write python script to read server password from my variable.

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  • Oracle Solaris Cluster 4.1 Released

    - by Larry Wake
    Today we announced the release of Oracle Solaris Cluster 4.1 ( download ; existing customers can just update from the package repository ).New capabilities include:  Oracle Solaris 10 Zone Clusters: The easiest way to update and consolidate existing Solaris 10 application environments is with Oracle Solaris 10 Zones within Oracle Solaris 11 -- not only do you get higher system utilization, but you can immediately leverage new features such as network virtualization.With Oracle Solaris Cluster 4.1, you can now cluster these zones, for even higher availability. Expanded disaster recovery operations: Oracle Solaris Cluster 4.1 introduces managed switchover and disaster-recovery takeover of applications and data using ZFS Storage Appliance replication services in a multi-site, multi-cluster configuration. Faster application recovery with improved storage failure detection and resource dependency management. Labeled security support for providing both high availability and high security, leveraging Oracle Solaris 11 Trusted Extensions. Learn more: Oracle Solaris Cluster at the Oracle Technology Network Data Sheet  What's New in Oracle Solaris Cluster 4.1  FAQs

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  • Missed question in technical phone interview and the follow up letter

    - by Jacob
    I may have just bombed a C++ technical phone interview. The interviewer asked mostly about data structures and I was able to go into detail about each of the data structures he asked about. Score one for me I'm thinking. Wrong. Then he asks to join me on a collaboration website where he can see what I am typing. This was the same process as interview #1 which went well, not perfect, but well. So the question was: How do you reverse a linked list? he gave a function prototype similar to Node *reverse(Node *head) I struggled with this for about 10-15 minutes until the hour was up. I was able to get the general idea across but was not able to reverse the link list. My question is that after remembering the answer post interview do I mention this in the thank you letter, if I even should write one?

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  • Server costs and back loading for mobile devices

    - by user23844
    A company approached me to design an MMO for the mobile platform and I have the perfect idea for them. My question is how much would a server for a FTP game that has both a PVE element and PVP cost? Also do you think that it would be better or is it even possible to back load the data onto the phones (trying to come up with some interesting way to back up the data in case of emergency). I don't want the game to be totally online reliant (I want to appeal to not only phone users but also iPod touch users) and for there to be an offline mode. If you can't tell this is my first game besides simple projects I've done on the side. Any help would be greatly appreciated.

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  • Subscribe/Publish Model in Web-based Application (c#) - Best Practices for Event Handlers

    - by KingOfHypocrites
    I was recently exposed to a desktop application that uses an publish/subscribe model to handle commands, events, etc. I can't seem to find any good examples of using this in a web application, so I wonder if I am off base in trying to use this for web based development (on the server side)? I'm using asp.net c#. My main question in regards to the design is: When using a publish/subscribe model, is it better to have generic commands/events that pass no parameters and then have the subscribers look at static context objects that contain the data relevant to the event? Or is it better to create custom arguments for every event that contain data related to the event? The whole concept of a global container seems so convenient but at the same time seems to break encapsulation. Any thoughts or best practices from anyone who has implemented this type of model in a web based application? Even suggestions on this model out of the scope of my question are appreciated.

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  • WebLogic Partner Community Newsletter September 2012

    - by JuergenKress
    Dear WebLogic partner community member Happy Birthday to our WebLogic partner Community! We launched the community a year ago, it is growing fast with almost 1,000 members and with a significant impact in our business. The WebLogic partner revenue grew significant last fiscal year. I would like to thank you for your contribution. It is indeed a great opportunity for your WebLogic service revenue, like consulting, implementation or training. There will be thousands of opportunities at our joint customer base, like iAs to WebLogic migration, J2EE platform consolidation or private clouds. We will continue to highlight these opportunities in our newsletter and offer you campaign kits. Please feel free to let us know if you are interested. I would also recommend you to give us your feedback in our WebLogic Partner Community Survey 2012! Your feedback is very important for us. We continue to offer free WebLogic 12c Bootcamps across Europe. Please make sure you register asap for your local training! In addition to this we plan to offer Exalogic 2.01 Bootcamp. If you are interested to attend it then please add your details to our wiki. Our ExaLogic kit is updated with ExaLogic 2.01 ppt & training & Installation check-list & tips & Web tier roadmap. In case you want to learn more about ExaLogic, please visit Qualogy virtual demo center. We have not only released the latest version of Tuxedo 12c but Andrejus also made a Performance Audit Tool - Runtime Diagnosis for ADF Applications which is available now. We uploaded the latest WebLogic 12c and Glassfish ppt presentation for your customer meetings to the WebLogic Community Workspace (WebLogic Community membership required). Are you ready and prepared for Oracle Open World 2012? Make sure you read our tips and enjoy the conference! WebLogic Server 11gR1 Interactive Quick Reference is a wonderful online overview. Make sure you do not miss it! If you want to try WebLogic why not in the Oracle Cloud - Java Cloud Service. Our Java Guru Adam Bien published a new book Real World Java EE Patterns. If you use Java on your machine, Please make sure that you update your Java SE. Jürgen Kress Oracle WebLogic Partner Adoption EMEA To read the newsletter please visit http://tinyurl.com/WebLogicnewsSeptember2012 (OPN Account required) To become a member of the WebLogic Partner Community please register at http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Wiki Technorati Tags: WebLogic Community newsletter,newsletter,WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress

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