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  • Push-Based Events in a Services Oriented Architecture

    - by Colin Morelli
    I have come to a point, in building a services oriented architecture (on top of Thrift), that I need to expose events and allow listeners. My initial thought was, "create an EventService" to handle publishing and subscribing to events. That EventService can use whatever implementation it desires to actually distribute the events. My client automatically round-robins service requests to available service hosts which are determined using Zookeeper-based service discovery. So, I'd probably use JMS inside of EventService mainly for the purpose of persisting messages (in the event that a service host for EventService goes down before it can distribute the message to all of the available listeners). When I started considering this, I began looking into the differences between Queues and Topics. Topics unfortunately won't work for me, because (at least for now), all listeners must receive the message (even if they were down at the time the event was pushed, or hadn't made a subscription yet because they haven't completed startup (during deployment, for example) - messages should be queued until the service is available). However, I don't want EventService to be responsible for handling all of the events. I don't think it should have the code to react to events inside of it. Each of the services should do what it needs with a given event. This would indicate that each service would need a JMS connection, which questions the value of having EventService at all (as the services could individually publish and subscribe to JMS directly). However, it also couples all of the services to JMS (when I'd rather that there be a single service that's responsible for determining how to distribute events). What I had thought was to publish an event to EventService, which pulls a configuration of listeners from some configuration source (database, flat file, irrelevant for now). It replicates the message and pushes each one back into a queue with information specific to that listener (so, if there are 3 listeners, 1 event would become 3 events in JMS). Then, another thread in EventService (which is replicated, running on multiple hots) would be pulling from the queue, attempting to make the service call to the "listener", and returning the message to the queue (if the service is down), or discarding the message (if the listener completed successfully). tl;dr If I have an EventService that is responsible for receiving events and delegating service calls to "event listeners," (which are really just endpoints on other services), how should it know how to craft the service call? Should I create a generic "Event" object that is shared among all services? Then, the EventService can just construct this object and pass it to the service call. Or is there a better answer to this problem entirely?

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  • Consuming ASMX and WCF Services using jQuery

    - by bipinjoshi
    In the previous part I demonstrated how jQuery animations can add some jazz to your web forms. Now let's see one of the most important feature of jQuery that you will probably use in all data driven websites - accessing server data. In the previous articles you used jQuery methods such as $.get() to make a GET request to the server. More powerful feature, however, is to make AJAX calls to ASP.NET Web Services, Page Methods and WCF services. The $.ajax() method of jQuery allows you to access these services. In fact $.get() method you used earlier internally makes use of $.ajax() method but restricts itself only to GET requests. The $.ajax() method provides more control on how the services are called.http://www.bipinjoshi.net/articles/479571df-7786-4c50-8db6-a798f195471a.aspx

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  • Platinum Services – The Highest Level of Service in the Industry

    - by cwarticki
    Oracle Platinum Services provides remote fault monitoring with faster response times and patch deployment services to qualified Oracle Premier Support customers – at no additional cost. We know that disruptions in IT systems availability can seriously impact business performance. That’s why we engineer our hardware and software to work together. Oracle engineered systems are pre-integrated to reduce the cost and complexity of IT infrastructures while increasing productivity and performance. And now, customers who choose the extreme performance of Oracle engineered systems have the power to access the added support they need – Oracle Platinum Services – to further optimize for high availability at no additional cost.  In addition to receiving the complete support essentials with Oracle Premier Support, qualifying Oracle Platinum Services customers also receive: •     24/7 Oracle remote fault monitoring •    Industry-leading response and restore times o   5-Minute Fault Notification o   15-Minute Restoration or Escalation to Development o   30-Minute Joint Debugging with Development •    Update and patch deployment Visit us online to learn more about how to get Oracle Platinum Services

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  • Features of Professional SEO Services

    The importance of Search Engine Optimization has given way to professional SEO services. The way they conduct optimization techniques to improve the websites' rankings are exemplary. Most of the companies that are involved into SEO services relate themselves as an effective alternative to improve the rankings in a professional manner. The current situation is that every reputed company are seeking SEO services in order to enhance their rankings on a further note.

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  • C# class architecture for REST services

    - by user15370
    Hi. I am integrating with a set of REST services exposed by our partner. The unit of integration is at the project level meaning that for each project created on our partners side of the fence they will expose a unique set of REST services. To be more clear, assume there are two projects - project1 and project2. The REST services available to access the project data would then be: /project1/search/getstuff?etc... /project1/analysis/getstuff?etc... /project1/cluster/getstuff?etc... /project2/search/getstuff?etc... /project2/analysis/getstuff?etc... /project2/cluster/getstuff?etc... My task is to wrap these services in a C# class to be used by our app developer. I want to make it simple for the app developer and am thinking of providing something like the following class. class ProjectClient { SearchClient _searchclient; AnalysisClient _analysisclient; ClusterClient _clusterclient; string Project {get; set;} ProjectClient(string _project) { Project = _project; } } SearchClient, AnalysisClient and ClusterClient are my classes to support the respective services shown above. The problem with this approach is that ProjectClient will need to provide public methods for each of the API's exposed by SearchClient, etc... public void SearchGetStuff() { _searchclient.getStuff(); } Any suggestions how I can architect this better?

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  • How can I put together services bettwen differents servers?

    - by poz2k4444
    For a schoolar project, I have to run differents services in a lab enviroment where I'll have 6 computers working as servers, what services can I put together, and what cannot be, in order to prevent security risks, and considereiting that if one service goes down, affects less possible the function of the server farm, the services are: MySql Http for intranet Https DHCP IPP SMTP LDAP VPN SSH NTP DNS NFS I'll use linux

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  • The Benefits of Using Ongoing Search Engine Optimization Services

    Many new clients of search engine optimization companies are unsure if they should opt for one-time search engine optimization services or ongoing services. One-time SEO services are appropriate for new websites for several reasons. Once you do the initial optimization of a new website, you have to wait a while in order to receive data that will help you determine the direction in which you need to optimize the site. A period of six months or so will give you enough data to determine what will and won't work for the site.

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  • What to Expect From Search Engine Optimization Services

    There are several search engine optimization services available on the internet who will gladly offer their services to those businesses wanting to update or even set up a website. However one needs to make sure that the SEO Company is reputable and have the capability of enhancing your services or products offered.

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  • IIS Media Services 4 Changing the Game

    The more I see of IIS Media Services 4 the more I observe the fundamental shift away from specialised and expense media servers to core services that run on top of any windows web server. In this case change is good as it provides options to the growing number of people that want to create and broadcast video online. Key Announcement #1: IIS Media Services will support a version of PlayReady DRM to enable protected HTTP streaming. The PlayReady DRM IIS Media Services solution will deploy on a single...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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  • Welcome Relief

    - by michael.seback
    Government organizations are experiencing unprecedented demand for social services. The current economy continues to put immense stress on social service organizations. Increased need for food assistance, employment security, housing aid and other critical services is keeping agencies busier than ever. ... The Kansas Department of Labor (KDOL) uses Oracle's social services solution in its employment security program. KDOL has used Siebel Customer Relationship Management (CRM) for nearly a decade, and recently purchased Oracle Policy Automation to improve its services even further. KDOL implemented Siebel CRM in 2002, and has expanded its use of it over the years. The agency started with Siebel CRM in the call center and later moved it into case management. Siebel CRM has been a strong foundation for KDOL in the face of rising demand for unemployment benefits, numerous labor-related law changes, and an evolving IT environment. ... The result has been better service for constituents. "It's really enabled our staff to be more effective in serving clients," said Hubka. That's a trend the department plans to continue. "We're 100 percent down the path of Siebel, in terms of what we're doing in the future," Hubka added. "Their vision is very much in line with what we're planning on doing ourselves." ... Community Services is the leading agency responsible for the safety and well-being of children and young people within Australia's New South Wales (NSW) Government. Already a longtime Oracle Case Management user, Community Services recently implemented Oracle Policy Automation to ensure accurate, consistent decisions in the management of child safety. "Oracle Policy Automation has helped to provide a vehicle for the consistent application of the Government's 'Keep Them Safe' child protection action plan," said Kerry Holling, CIO for Community Services. "We believe this approach is a world-first in the structured decisionmaking space for child protection and we believe our department is setting an example that other child protection agencies will replicate." ... Read the full case study here.

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  • SQL SERVER – Determine if SSRS 2012 is Installed on your SQL Server

    - by Pinal Dave
    This example is from the Beginning SSRS by Kathi Kellenberger. Supporting files are available with a free download from the www.Joes2Pros.com web site. Determine if SSRS 2012 is Installed on your SQL Server You may already have SSRS, or you may need to install it. Before doing any installation it makes sense to know where you are now. If you happened to install SQL Server with all features, you have the tools you need. There are two tools you need: SQL Server Data Tools and Reporting Services installed in Native Mode. To find out if SQL Server Data Tools (SSDT) is installed, click the Start button, go to All Programs, and expand SQL Server 2012. Look for SQL Server Data Tools   Now, let’s check to see if SQL Server Reporting Services is installed. Click the Start > All Programs > SQL Server 2012 > Configuration Tools > SQL > Server Configuration Manager   Once Configuration Manager is running, select SQL Server Services. Look for SQL Server Reporting Services in the list of services installed. If you have both SQL Server Reporting Services service and SQL Server Developer tools installed, you will not have to install them again. You may have SQL Server installed, but are missing the Data Tools or the SSRS service or both. In tomorrow blog post we will go over how to install based on where you are now.   Tomorrow’s Post Tomorrow’s blog post will show how to install and configure SSRS. If you want to learn SSRS in easy to simple words – I strongly recommend you to get Beginning SSRS book from Joes 2 Pros. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL Tagged: Reporting Services, SSRS

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  • OSGI Declarative Services (DS): What is a good way of using service component instances

    - by Christoph
    I am just getting started with OSGI and Declarative Services (DS) using Equinox and Eclipse PDE. I have 2 Bundles, A and B. Bundle A exposes a component which is consumed by Bundle B. Both bundles also expose this service to the OSGI Service registry again. Everything works fine so far and Equinox is wireing the components together, which means the Bundle A and Bundle B are instanciated by Equinox (by calling the default constructor) and then the wireing happens using the bind / unbind methods. Now, as Equinox is creating the instances of those components / services I would like to know what is the best way of getting this instance? So assume there is third class class which is NOT instantiated by OSGI: Class WantsToUseComponentB{ public void doSomethingWithComponentB(){ // how do I get componentB??? Something like this maybe? ComponentB component = (ComponentB)someComponentRegistry.getComponent(ComponentB.class.getName()); } I see the following options right now: 1. Use a ServiceTracker in the Activator to get the Service of ComponentBundleA.class.getName() (I have tried that already and it works, but it seems to much overhead to me) and make it available via a static factory methods public class Activator{ private static ServiceTracker componentBServiceTracker; public void start(BundleContext context){ componentBServiceTracker = new ServiceTracker(context, ComponentB.class.getName(),null); } public static ComponentB getComponentB(){ return (ComponentB)componentBServiceTracker.getService(); }; } 2. Create some kind of Registry where each component registers as soon as the activate() method is called. public ComponentB{ public void bind(ComponentA componentA){ someRegistry.registerComponent(this); } or public ComponentB{ public void activate(ComponentContext context){ someRegistry.registerComponent(this); } } } 3. Use an existing registry inside osgi / equinox which has those instances? I mean OSGI is already creating instances and wires them together, so it has the objects already somewhere. But where? How can I get them? Conclusion Where does the class WantsToUseComponentB (which is NOT a Component and NOT instantiated by OSGI) get an instance of ComponentB from? Are there any patterns or best practises? As I said I managed to use a ServiceTracker in the Activator, but I thought that would be possible without it. What I am looking for is actually something like the BeanContainer of Springframework, where I can just say something like Container.getBean(ComponentA.BEAN_NAME). But I don't want to use Spring DS. I hope that was clear enough. Otherwise I can also post some source code to explain in more detail. Thanks Christoph UPDATED: Answer to Neil's comment: Thanks for clarifying this question against the original version, but I think you still need to state why the third class cannot be created via something like DS. Hmm don't know. Maybe there is a way but I would need to refactor my whole framework to be based on DS, so that there are no "new MyThirdClass(arg1, arg2)" statements anymore. Don't really know how to do that, but I read something about ComponentFactories in DS. So instead of doing a MyThirdClass object = new MyThirdClass(arg1, arg2); I might do a ComponentFactory myThirdClassFactory = myThirdClassServiceTracker.getService(); // returns a if (myThirdClassFactory != null){ MyThirdClass object = objectFactory.newInstance(); object.setArg1("arg1"); object.setArg2("arg2"); } else{ // here I can assume that some service of ComponentA or B went away so MyThirdClass Componenent cannot be created as there are missing dependencies? } At the time of writing I don't know exactly how to use the ComponentFactories but this is supposed to be some kind of pseudo code :) Thanks Christoph

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  • Demystified - BI in SharePoint 2010

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). Frequently, my clients ask me if there is a good guide on deciphering the seemingly daunting choice of products from Microsoft when it comes to business intelligence offerings in a SharePoint 2010 world. These are all described in detail in my book, but here is a one (well maybe two) page executive overview. Microsoft Excel: Yes, Microsoft Excel! Your favorite and most commonly used in the world database. No it isn’t a database in technical pure definitions, but this is the most commonly used ‘database’ in the world. You will find many business users craft up very compelling excel sheets with tonnes of logic inside them. Good for: Quick Ad-Hoc reports. Excel 64 bit allows the possibility of very large datasheets (Also see 32 bit vs 64 bit Office, and PowerPivot Add-In below). Audience: End business user can build such solutions. Related technologies: PowerPivot, Excel Services Microsoft Excel with PowerPivot Add-In: The powerpivot add-in is an extension to Excel that adds support for large-scale data. Think of this as Excel with the ability to deal with very large amounts of data. It has an in-memory data store as an option for Analysis services. Good for: Ad-hoc reporting and logic with very large amounts of data. Audience: End business user can build such solutions. Related technologies: Excel, and Excel Services Excel Services: Excel Services is a Microsoft SharePoint Server 2010 shared service that brings the power of Excel to SharePoint Server by providing server-side calculation and browser-based rendering of Excel workbooks. Thus, excel sheets can be created by end users, and published to SharePoint server – which are then rendered right through the browser in read-only or parameterized-read-only modes. They can also be accessed by other software via SOAP or REST based APIs. Good for: Sharing excel sheets with a larger number of people, while maintaining control/version control etc. Sharing logic embedded in excel sheets with other software across the organization via REST/SOAP interfaces Audience: End business users can build such solutions once your tech staff has setup excel services on a SharePoint server instance. Programmers can write software consuming functionality/complex formulae contained in your sheets. Related technologies: PerformancePoint Services, Excel, and PowerPivot. Visio Services: Visio Services is a shared service on the Microsoft SharePoint Server 2010 platform that allows users to share and view Visio diagrams that may or may not have data connected to them. Connected data can update these diagrams allowing a visual/graphical view into the data. The diagrams are viewable through the browser. They are rendered in silverlight, but will automatically down-convert to .png formats. Good for: Showing data as diagrams, live updating. Comes with a developer story. Audience: End business users can build such solutions once your tech staff has setup visio services on a SharePoint server instance. Developers can enhance the visualizations Related Technologies: Visio Services can be used to render workflow visualizations in SP2010 Reporting Services: SQL Server reporting services can integrate with SharePoint, allowing you to store reports and data sources in SharePoint document libraries, and render these reports and associated functionality such as subscriptions through a SharePoint site. In SharePoint 2010, you can also write reports against SharePoint lists (access services uses this technique). Good for: Showing complex reports running in a industry standard data store, such as SQL server. Audience: This is definitely developer land. Don’t expect end users to craft up reports, unless a report model has previously been published. Related Technologies: PerformancePoint Services PerformancePoint Services: PerformancePoint Services in SharePoint 2010 is now fully integrated with SharePoint, and comes with features that can either be used in the BI center site definition, or on their own as activated features in existing site collections. PerformancePoint services allows you to build reports and dashboards that target a variety of back-end datasources including: SQL Server reporting services, SQL Server analysis services, SharePoint lists, excel services, simple tables, etc. Using these you have the ability to create dashboards, scorecards/kpis, and simple reports. You can also create reports targeting hierarchical multidimensional data sources. The visual decomposition tree is a new report type that lets you quickly breakdown multi-dimensional data. Good for: Mostly everything :), except your wallet – it’s not free! But this is the most comprehensive offering. If you have SharePoint server, forget everything and go with performance point. Audience: Developers need to setup the back-end sources, manageability story. DBAs need to setup datawarehouses with cubes. Moderately sophisticated business users, or developers can craft up reports using dashboard designer which is a click-once App that deploys with PerformancePoint Related Technologies: Excel services, reporting services, etc.   Other relevant technologies to know about: Business Connectivity Services: Allows for consumption of external data in SharePoint as columns or external lists. This can be paired with one or more of the above BI offerings allowing insight into such data. Access Services: Allows the representation/publishing of an access database as a SharePoint 2010 site, leveraging many SharePoint features. Reporting services is used by Access services. Secure Store Service: The SP2010 Secure store service is a replacement for the SP2007 single sign on feature. This acts as a credential policeman providing credentials to various applications running with SharePoint. BCS, PerformancePoint Services, Excel Services, and many other apps use the SSS (Secure Store Service) for credential control. Comment on the article ....

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  • Enum in WCF RIA Services Object

    - by Blake Blackwell
    Is it possible to have an enum with WCF RIA Services? When I check the generated code for my custom POCO class I don't see the enum property generated. Here is an example of what I'm trying to do: public class Legend { public enum ViewStateType { OnExpanded = 1, OnContracted = 2, OffExpanded = 3, OffContracted = 4 } [Key] public Guid LegendId { get; set; } [EnumDataType(typeof(ViewStateType))] public ViewStateType ViewState { get; set; } } I tried with and without the EnumDataType attribute.

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  • Fluent NHibernate Automapping with RIA services

    - by VexXtreme
    Hi guys I've encountered a slight problem recently, or rather a lack of understanding of how NHibernate automapping works with RIA data services. Namely, I don't understand how to use Association and Include attributes. For instance, I've created two tables in my database and corresponding classes (that NHibernate correctly fills). The problem is, RIA doesn't generate properties (collections) bound by foreign key to other tables, on the client side, although I've defined them in my classes in my domain model... it generates just properties that belong to their own class, on the client side. I assume that these attributes aren't necessary since NHibernate automapper is supposed to fill those collections on it's own... I'm quite confused as to how this works. And I don't understand why RIA simply skips properties such as public virtual IList<Medication> Medications{ get; set; } during autogeneration. Any input is appreciated Thanks

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  • Random "Not Found" error with Silverlight accessing ASP.NET Web Services

    - by user245822
    I'm developing an application with Silverlight 3 and ASP.NET Web Services, which uses Linq to SQL to get data from my SQL Server database. Randomly when the user causes an action to get information from any of my web service methods, Silverlight throws the exception "The remote server returned an error: NotFound.", of type "CommunicationException", with the InnerException status of "System.Net.WebExceptionStatus.UnknownError". Almost 10% of requests gets this error. If the user tries to get the same information again, normally the request has no erros and the user gets the data. When debugging in Visual Studio only Silverlight stops on the exception, and I see no reason for the web service not being found.

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  • WCF RIA Services build error

    - by soren.enemaerke
    Hi I'm getting a strange error when building my WCF RIA Services Silverlight project in VS2008. In the output I have this message: C:\Program Files\MSBuild\Microsoft\Silverlight\v3.0\Microsoft.Ria.Client.targets(261,5): error : Failed to write the generated contents of 'C:\projects\[Path_To_Silverlight_Project]\Generated_Code\Analytics.Web.g.cs' to Visual Studio. ...and Visual Studio opens a dialog while building with the following: An editor or project is attempting to save a file that is modified in memory. Saving files during a build is dangerous and may result in incorrect build outputs in the future. Continue with save? The other members on my team seems to be doing just fine, but I can't get past this point (I can if I click 'Continue' which then generate the file just fine but I'm reluclant to do so). There must be some setup or similar that I'm missing here... PS: I'm currently on WinXP and WCF RIA Service beta

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  • Scheduled task with windows services and system.timer.timer

    - by nccsbim071
    Hi i want implement a windows services scheduled task. I already created windows service. In a service i have implemented a timer.The timer is initialized at class interval. The timers interval is set in the start method of service and also it is enabled in the start method of the service. After timers elapsed event is fire i have done some actions. My problem is that, i am in a dilemma. Lets say the action i have done in Elapsed event, lets say take one hour and the timers interval is set to half an hour. so there are chances that even if the previous call to elapsed event has not ended new call to elapsed event will occur. my question will there be any conflict or is it ok or shall i use threads. please give some advice

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  • Security and authentication in web services

    - by King
    Lets say we have a website that uses a web service for all of its functionality (i.e. retrieving and updating data from/to db), how does the web service authenticate requests? As I understand it, in a traditional java "website" a user provides a username & password, and upon validation a jsessionid is assigned to the user (client browser). Every time the client browser asks the website for something, the site checks for the jsessionid ensuring that the user is registered and authenticated. Is there a web services equivalent of this? If yes, what?

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