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  • My card reader doesn't show up at all, but previously did in 10.10

    - by Nathan J. Brauer
    I bought a pin-based-USB powered internal media card reader and it worked perfectly when I first installed Ubuntu 10.10 a month ago. I used it a few times since and today I booted up the computer and it's not working. Here's how it used to work: In nautilus->computer, 5 "drives" would display even when no card was inserted. One for each slot (SD, XD, CF/MS, etc). Opening one w/o a card would initiate a "Please insert card." dialog. Inserting a card would automatically open nautilus. Now: No drives display at all whether cards are inserted or not. lsusb lists the following (which seems to indicate that it's not being detected) Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 002: ID 046d:c52e Logitech, Inc. (my keyboard/mouse) Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode) Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub (A side note, all of my USB ports are 2.0 + 1 USB port which is 3.0, why does everything say 1.1/2.0?) I tried using ubuntu-bug but for USB devices it expects you to be able to remove and insert them while the computer is running -- obviously something you probably shouldn't be doing when you're dealing with devices plugged straight into the USB pins. Thanks in advance!

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  • Accessing a Web Service: Learning Resource needed

    - by abel
    I have been searching for resources to learn (Java) Web Services. Although I have found a lot of resources and tutorials on JWS, I am confused with the version numbers, the abbreviations and Metro. Plus the last update to Metro was in 2008. Is it a worthwile thing to learn? I wanted to learn how to access Web Services, since an upcoming project is about accessing one. I have some experience with OAuth on Twitter(using code available). Things I know about the project: I have to access a Web Service. Java is the preferred platform to use(Although I know I can use any). Axis can be used to access the Web Service(I have never used Axis) I have a meeting scheduled to learn more, but I sure don't want to look silly since I am no Java expert, have never created or accessed Web Services using Java. My Questions: 1.Can someone point me to a tutorial which will help me learn how to access a already running Web Service (Preferably SOAP(?), not REST. It's XML based) 2. Will you recommend using PHP or Python to do the work of accessing the web service? I am expecting a lot of nay saying, but I hope I get some answers too. I will clarify things if needed.

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  • Canon MG6100 series USB Printer not mounting

    - by user35201
    Printer MP6150 driver installed itself upon plugging in the printer. Printer is recognized (lsusb shows it) but does not mount. If the printer is recognized, the driver must be working (or?), but something is blocking the system from mounting the printer. Tried the usual things: power of printer, restart Ubuntu etc. Listed below result of lsusb and fstab: hans@kontor-linux:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 004: ID 04a9:174a Canon, Inc. Bus 002 Device 002: ID 1058:1001 Western Digital Technologies, Inc. External Hard Disk [Elements] Bus 004 Device 002: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser hans@kontor-linux:~$ sudo cat /etc/fstab [sudo] password for hans: # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda6 during installation UUID=eaf3b38d-1c81-4de9-98d4-3834d674ff6e / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=93a667d3-6132-45b5-ad51-1f8a46c5b437 none swap sw 0 0

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  • Canon MG6100 series USB printer receives job but doesn't physically print

    - by Old-linux-fan
    Printer MP6150 driver installed itself upon plugging in the printer. Printer is recognized (lsusb shows it) but does not mount. If the printer is recognized, the driver must be working (or?), but something is blocking the system from mounting the printer. Tried the usual things: power of printer, restart Ubuntu etc. Listed below result of lsusb and fstab: hans@kontor-linux:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 004: ID 04a9:174a Canon, Inc. Bus 002 Device 002: ID 1058:1001 Western Digital Technologies, Inc. External Hard Disk [Elements] Bus 004 Device 002: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser hans@kontor-linux:~$ sudo cat /etc/fstab [sudo] password for hans: # /etc/fstab: static file system information. # # Use 'blkid' to print the universally unique identifier for a # device; this may be used with UUID= as a more robust way to name devices # that works even if disks are added and removed. See fstab(5). # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # / was on /dev/sda6 during installation UUID=eaf3b38d-1c81-4de9-98d4-3834d674ff6e / ext4 errors=remount-ro 0 1 # swap was on /dev/sda5 during installation UUID=93a667d3-6132-45b5-ad51-1f8a46c5b437 none swap sw 0 0

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  • Understanding Service Compensation part of Industrial SOA series

    - by JuergenKress
    Some of the most important SOA design patterns that we have successfully applied in projects will be described in this article. These include the Compensation pattern and the UI mediator pattern, the Common Data Format pattern and the Data Access pattern. All of these patterns are included in Thomas Erl's book, "SOA Design Patterns", and are presented here in detail, together with our practical experiences. We begin our "best of" SOA pattern collection with the Compensation pattern. Compensation is required in error situations in an SOA, as multiple atomic service operations cannot generally be linked with classic transactions this would violate the principle of loose coupling. An error situation of this sort will occur, particularly if service operations are combined into processes or new services during orchestration or by applying the Composite pattern, and the transaction bracket has to be expanded as a result. We need mechanisms to undo the effects of individual services (the status changes in the overall system) and to ensure that a consistent system state is maintained at all times, so as to preserve system integrity. For the Compensation pattern, we would like to address the following questions: Why is compensation important in relation to SOA? How is the topic of compensation linked with the topic of transactions? What are the challenges with regard to compensation... Read the full article in the Service Technology Magazine or at OTN. Share your comments and feedback on the Industrial SOA series by using the hashtag #industrialsoa. Missed an article of the Industrial SOA series visit the overview at OTN. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Mix Forum Technorati Tags: Industrial SOA,SOA,SOA Service Compensation,Community,Oracle SOA,Oracle BPM,OPN,Jürgen Kress

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  • Install reliance Driver software in ubuntu 14.04

    - by A Umar Mukthar
    I'm Using Huawei ec 150 dongle. I need to install driver software It is quiet a big task for begineers in linux. So i took this matter over here. EDIT Output of lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 003: ID 12d1:140b Huawei Technologies Co., Ltd. EC1260 Wireless Data Modem HSD USB Card Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 003: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse Bus 002 Device 002: ID 046d:c31d Logitech, Inc. Media Keyboard K200 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

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  • SOA Cloud and Service Technology Symposium December 4-5th 2013 in Mexico

    - by JuergenKress
    Do you want to attend the SOA; Cloud and Service Technology Symposium December 4-5th 2013 in Mexico? Please feel free to use the promotional code “Q14CB324” for a 50% discount. Here are the Conference presentations from Partners and Oracle: "Cloud Service Brokers" Jürgen Kress, Oracle, Rolando Carrasco, S&P Solutions "Fast Data - Delivering High-Velocity and Volume Big Data Business Value in Real Time" Robin Smith, Oracle, Robert Greene, Oracle "Unlocking the Value of Big Data" Raul Goycoolea Seoane, Oracle "Modeling Business Process Architecture on BPMN 2.0 and Decomposing it to Service Inventory" Jorge Heredia, Itehl Consulting "BPM and Dynamic/Adaptive Case Management - Friends or Foes?" Manas Deb, Oracle "Building SOA and MDM Solutions to Enable Cloud Adoption" Luis Weir, HCL, John Dunn, HCL "Secure Applications in the Cloud: Security & Privacy Patterns and Mechanisms" Ricardo Puttini, University of Brasília, Anderson Nascimento, University of Brasília "SOA, Data Grids, Mobile and Clouds - Where Next for SOA?" Matt Brasier, C2B2 Consulting LTD "Achieving Greater Responsiveness with BPM" Andre Boaventura, Oracle Do you want to meet the Oracle team at the conference? Please send us a message on twitter @soacommunity. Do you want to network at the conference? Please use the #soacommunity. For details and registrations please visit the conference website. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Mix Forum Technorati Tags: SOA Symposium,Thmas Erl,Service Technolgy Symosium,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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  • JSON Support in Azure

    - by kaleidoscope
    Please find how we call JavaScript Object Notation in cloud applications. As we all know how client script is useful in web applications in terms of performance.           Same we can use JQuery in Asp.net using Cloud  computing which will  asynchronously pull any messages out of the table(cloud storage)  and display them in the     browser by invoking a method on a controller that returns JavaScript Object Notation (JSON) in a well-known shape. Syntax : Suppose we want to write a  JQuery function which return some notification while end user interact with our application so use following syntax : public JsonResult GetMessages() {      if (User.Identity.IsAuthenticated)      {     UserTextNotification[] userToasts =           toastRepository.GetNotifications(User.Identity.Name);          object[] data =          (from UserTextNotification toast in userToasts          select new { title = toast.Title ?? "Notification",          text = toast.MessageText }).ToArray();           return Json(data, JsonRequestBehavior.AllowGet);      }         else            return Json(null); } Above function is used to check authentication and display message if user is not exists in Table. Plateform :   ASP.NET 3.5  MVC 1   Under Visual Studio 2008  . Please find below link for more detail : http://msdn.microsoft.com/en-us/magazine/ee335721.aspx   Chandraprakash, S

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  • 80% off for SQL Azure!

    - by Hugo Kornelis
    I have spent the last three days at SQLBits X in London – a truly great experience! There were lots of quality sessions, but I also enjoyed meeting new people and catching up with old friends. One of these friends (and I hope he’s still a friend after I post this) is Buck Woody . Not only a great and humorous speaker, but also a very nice fellow – for those who don’t mind being teased every now and then. When we were chatting, he told me that he was planning to announce a special access code to allow...(read more)

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  • mic on cam don't work

    - by ezz9
    the cam works. I pull up PulseAudio I can see it pick me up for 1sec then stops. don't work on Skype I've tried every USB port same thing it worked on 10.04 fine. but now I'm on 12.04 and it don't work. it is a logitech B500 desktop:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 002: ID 046d:0807 Logitech, Inc. Webcam B500 Bus 003 Device 002: ID 03f0:6104 Hewlett-Packard DeskJet 5650c Bus 005 Device 002: ID 046d:c51b Logitech, Inc. V220 Cordless Optical Mouse for Notebooks I have changed some setting in flash Player Settings Manager, I don't think it would affect it after all the cam is still working it's the microphone that freezes up, but thought I would tell you this, info is good.

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  • SOA, Could & Service Technology Symposium VIP pass 50% discount

    - by JuergenKress
    A series of podcasts, brought to you by Arcitura Education, SOASchool.com and CloudSchool.com in co-operation with the International Service Technology Symposium Conference Series, and the Prentice Hall Service Technology Series from Thomas Erl. As Part II of this Special Podcast Series, individuals will be able to tune into six distinct audio podcasts with expert speakers for the upcoming 5th International SOA, Cloud + Service Technology Symposium in London, UK on September 24-25, 2012. SOA, Cloud and Service Technology Symposium 2012 For Conference Details please visit the registration page Oracle promotion discount please enter during the registration the code DJMXZ370 Oracle Specialized SOA & BPM Partners at the conference: Oracle Specialized partners have proven their skills by certifications and customer references. To find a local Specialized partner please visit http://solutions.oracle.com SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit  www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Technorati Tags: SOA Cloud,SOA Governance,SOA Symposium,Thomas Erl,SOA Community,Oracle SOA,Oracle BPM,BPM,Community,OPN,Jürgen Kress

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  • Publication d'une application LightSwitch dans Windows Azure, un article d'Avkash Chauhan, traduit par Deepin Prayag

    Citation: Visual Studio LightSwitch 2011 propose des « starter kits » et des options de déploiement flexibles qui vous aident à créer et à facilement publier des applications métier personnalisées à l'aspect professionnel et distingué, sans nécessité de code. Visual Studio LightSwitch propose une manière simple de développer des applications métier de type bureau ou Cloud. LightSwitch gère toute la plomberie pour vous, afin que vous puissiez vous concentrer sur la création de valeurs métier. Partie 2 :

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  • Service layer coupling

    - by Justin
    I am working on writing a service layer for an order system in php. It's the typical scenario, you have an Order that can have multiple Line Items. So lets say a request is received to store a line item with pictures and comments. I might receive a json request such as { 'type': 'Bike', 'color': 'Red', 'commentIds': [3193,3194] 'attachmentIds': [123,413] } My idea was to have a Service_LineItem_Bike class that knows how to take the json data and store an entity for a bike. My question is, the Service_LineItem class now needs to fetch comments and file attachments, and store the relationships. Service_LineItem seems like it should interact with a Service_Comment and a Service_FileUpload. Should instances of these two other services be instantiated and passed to the Service_LineItem constructor,or set by getters and setters? Dependency injection seems like the right solution, allowing a service access to a 'service fetching helper' seems wrong, and this should stay at the application level. I am using Doctrine 2 as a ORM, and I can technically write a dql query inside Service_LineItem to fetch the comments and file uploads necessary for the association, but this seems like it would have a tighter coupling, rather then leaving this up to the right service object.

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  • Windows Azure Platform for Enterprises

    Cloud computing has already proven worthy of attention from established enterprises and start-ups alike. Most businesses are looking at cloud computing with more than just idle curiosity. As of this writing, IT market research suggests that most enterprise IT managers have enough resources to adopt cloud computing in combination with on-premises IT capabilities.

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  • Windows Azure Platform for Enterprises

    Cloud computing has already proven worthy of attention from established enterprises and start-ups alike. Most businesses are looking at cloud computing with more than just idle curiosity. As of this writing, IT market research suggests that most enterprise IT managers have enough resources to adopt cloud computing in combination with on-premises IT capabilities.

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  • Easy to use JSON Web Service Hosts?

    - by Serguei Fedorov
    I saw this being used by someone in a college class once and cannot find anything that is analogous to it. I am not sure if this is the right place to ask about something like this, but hopefully I can get some direction. I want to write an app which uses web services that can obtain and push data back to the client apps. Right now I am gathering up the design and documentation of this app. Not having to code the web service myself would reduce development time by a lot; instead using an easy to setup web service that will be easy to setup and manage. Either XML based on JSON based is totally fine; though I would prefer JSON for its reduced overhead. Like I said I have seen this demonstrated before; you define the data structure to be stored and how it is treated. I cannot find the person who demonstrated this; hopefully maybe someone can suggest something? The service he used was free with a limited amount of requests allowed. EDIT: He was using an online service to do this not a script which is installed onto an existing web hosting account. Thank you!

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  • Stop Food Waste - OS Open Data & SQL Azure

    An attempt to use Ordanance Survey OS Open Data, SQL Server and SharePoint in the construction of a system for supermarkets to supply expiring food to nearby homeless shelters. What are your servers really trying to tell you? Find out with new SQL Monitor 3.0, an easy-to-use tool built for no-nonsense database professionals.For effortless insights into SQL Server, download a free trial today.

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  • Microsoft Issues Security Guidelines for Windows Azure

    New software development lifecycle outlines how to address security threats in the cloud....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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  • A Web Service to collect data from local servers every hour

    - by anilerduran
    I'm trying to find a way to collect data from different servers around the world. Here are the details: There is only one single PowerShell script on servers that encrypts data (simple csv file) and sends with preferred method (HTTP/HTTPS Post could be) There is no more control on that servers. Can't install any service, process etc. Just I can configure script to execute every hour. This script also will have encrypted username/password/license key for every server. Script will compress data and send to me with these information. So I need a service (I'm not sure if Web Service is the rigth solution) on the cloud that will help me to: Will get data that is sent from servers using a method. Will authenticate request to recognize sender using license key/username/password and most importantly, Will redirect/send this filecab to my SQL Server on the cloud (Azure). Also it should seperate data according to customer information in license key. So every data for every customer will be stored in dedicated DB/Tables on my SQL All the processes above should be completed automatically. No way for manual steps. Question: A Web Service (SOAP or Restful) is the rigth solution for that?

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  • D-Link DWA-125 Wireless network card not working after upgrade from 10.04 to 12.04

    - by dava2788
    I upgraded to Ubuntu 12.04 and now the wireless network card D-Link DWA-125 doesn't work. I have the drivers from the official website, But neither recognized during installation. iwconfig: lo no wireless extensions. vmnet8 no wireless extensions. ra0 Ralink STA Link Quality:0 Signal level:0 Noise level:0 Rx invalid nwid:0 invalid crypt:0 invalid misc:0 eth0 no wireless extensions. vmnet1 no wireless extensions. dava@Dava-Ubuntu:~$ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 006: ID 07d1:3c0d D-Link System DWA-125 Wireless N 150 Adapter(rev.A1) [Ralink RT3070] And the chipset: ralink 2870/3070 (rt3070)

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  • Is RTD Stateless or Stateful?

    - by [email protected]
    Yes.   A stateless service is one where each request is an independent transaction that can be processed by any of the servers in a cluster.  A stateful service is one where state is kept in a server's memory from transaction to transaction, thus necessitating the proper routing of requests to the right server. The main advantage of stateless systems is simplicity of design. The main advantage of stateful systems is performance. I'm often asked whether RTD is a stateless or stateful service, so I wanted to clarify this issue in depth so that RTD's architecture will be properly understood. The short answer is: "RTD can be configured as a stateless or stateful service." The performance difference between stateless and stateful systems can be very significant, and while in a call center implementation it may be reasonable to use a pure stateless configuration, a web implementation that produces thousands of requests per second is practically impossible with a stateless configuration. RTD's performance is orders of magnitude better than most competing systems. RTD was architected from the ground up to achieve this performance. Features like automatic and dynamic compression of prediction models, automatic translation of metadata to machine code, lack of interpreted languages, and separation of model building from decisioning contribute to achieving this performance level. Because  of this focus on performance we decided to have RTD's default configuration work in a stateful manner. By being stateful RTD requests are typically handled in a few milliseconds when repeated requests come to the same session. Now, those readers that have participated in implementations of RTD know that RTD's architecture is also focused on reducing Total Cost of Ownership (TCO) with features like automatic model building, automatic time windows, automatic maintenance of database tables, automatic evaluation of data mining models, automatic management of models partitioned by channel, geography, etcetera, and hot swapping of configurations. How do you reconcile the need for a low TCO and the need for performance? How do you get the performance of a stateful system with the simplicity of a stateless system? The answer is that you make the system behave like a stateless system to the exterior, but you let it automatically take advantage of situations where being stateful is better. For example, one of the advantages of stateless systems is that you can route a message to any server in a cluster, without worrying about sending it to the same server that was handling the session in previous messages. With an RTD stateful configuration you can still route the message to any server in the cluster, so from the point of view of the configuration of other systems, it is the same as a stateless service. The difference though comes in performance, because if the message arrives to the right server, RTD can serve it without any external access to the session's state, thus tremendously reducing processing time. In typical implementations it is not rare to have high percentages of messages routed directly to the right server, while those that are not, are easily handled by forwarding the messages to the right server. This architecture usually provides the best of both worlds with performance and simplicity of configuration.   Configuring RTD as a pure stateless service A pure stateless configuration requires session data to be persisted at the end of handling each and every message and reloading that data at the beginning of handling any new message. This is of course, the root of the inefficiency of these configurations. This is also the reason why many "stateless" implementations actually do keep state to take advantage of a request coming back to the same server. Nevertheless, if the implementation requires a pure stateless decision service, this is easy to configure in RTD. The way to do it is: Mark every Integration Point to Close the session at the end of processing the message In the Session entity persist the session data on closing the session In the session entity check if a persisted version exists and load it An excellent solution for persisting the session data is Oracle Coherence, which provides a high performance, distributed cache that minimizes the performance impact of persisting and reloading the session. Alternatively, the session can be persisted to a local database. An interesting feature of the RTD stateless configuration is that it can cope with serializing concurrent requests for the same session. For example, if a web page produces two requests to the decision service, these requests could come concurrently to the decision services and be handled by different servers. Most stateless implementation would have the two requests step onto each other when saving the state, or fail one of the messages. When properly configured, RTD will make one message wait for the other before processing.   A Word on Context Using the context of a customer interaction typically significantly increases lift. For example, offer success in a call center could double if the context of the call is taken into account. For this reason, it is important to utilize the contextual information in decision making. To make the contextual information available throughout a session it needs to be persisted. When there is a well defined owner for the information then there is no problem because in case of a session restart, the information can be easily retrieved. If there is no official owner of the information, then RTD can be configured to persist this information.   Once again, RTD provides flexibility to ensure high performance when it is adequate to allow for some loss of state in the rare cases of server failure. For example, in a heavy use web site that serves 1000 pages per second the navigation history may be stored in the in memory session. In such sites it is typical that there is no OLTP that stores all the navigation events, therefore if an RTD server were to fail, it would be possible for the navigation to that point to be lost (note that a new session would be immediately established in one of the other servers). In most cases the loss of this navigation information would be acceptable as it would happen rarely. If it is desired to save this information, RTD would persist it every time the visitor navigates to a new page. Note that this practice is preferred whether RTD is configured in a stateless or stateful manner.  

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