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  • Oracle Database I/O Performance Tuning Using Benchmark Factory

    The real test of how heavily an Oracle database will tax its underlying I/O subsystem and related infrastructure is to actually tax that infrastructure using representative database application workloads. Jim Czuprynski tells you how to choose appropriate database schema(s) for realistic testing, how to create example TPC-E and TPC-H database schemas and how to perform initial loading of these schemas using Quest Benchmark Factory.

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  • MeeGo, the new netbook Linux, arrives

    <b>Cyber Cynic:</b> "Take one part Intel's Moblin, mix with Nokia's Maemo, bake for three months in the Linux Foundation oven, and you get MeeGo. Linux Foundation executive director, Jim Zemlin has called this new embedded Linux, the open-source uber-platform for the next generation of computing devices:"

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  • Microphone not working in Windows Virtual PC (on Windows 7)

    - by Clay Nichols
    I"m using Windows Virtual PC on Windows 7 (host) running Windows XP (as the Guest O/S) I'm trying to get the Microphone working. When I Enable Integration Features: Microphone does not work When I run the Sound Recorder, the record button is disabled. If I look at Sound settings, there are no options for the Mic (it's all disabled "grayed out"). Speakers work Copy & Paste works When I Disable Integration Features: Microphone and speakers work Copy and Paste does not (as expected) Drag'n Drop copying does not work in either situation. What I've Tried Verified that the Windows XP Mode Virtual PC guest also has the same symptoms (Mic doesn't work) and audio out (speakers) do work. I"m going to try (but have little hope) to: -Uninstall and Reinstall the Integration addin for Virtual PC

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  • Open Source Scheduling Software?

    - by Kaiser Advisor
    Hi Everyone, I'm looking for scheduling software to schedule 25 people over 8 work sites. Most are FT and can work up to 40 hours a week, but some are part-time and can only work certain days of the week and up to a certain number of hours a week. There are 3 classes of employees: Managers, Supervisors, and Workers. They should be shuffled so that they spend approximately equal time at each of the 8 work sites and with all classes of employees; i.e., Joe the worker should spend about 1 out of 8 days on each work site, and work with managers, supervisors, and other workers equally. I tried to do this in excel with the solver, but the shuffling requirement makes it way too complicated, so I'm stuck trying to do big parts of this manually with the solver helping out with just the hour provisioning piece. Is there any open source software that could help me? Much appreciated! KA

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  • Mapping UrlEncoded POST Values in ASP.NET Web API

    - by Rick Strahl
    If there's one thing that's a bit unexpected in ASP.NET Web API, it's the limited support for mapping url encoded POST data values to simple parameters of ApiController methods. When I first looked at this I thought I was doing something wrong, because it seems mighty odd that you can bind query string values to parameters by name, but can't bind POST values to parameters in the same way. To demonstrate here's a simple example. If you have a Web API method like this:[HttpGet] public HttpResponseMessage Authenticate(string username, string password) { …} and then hit with a URL like this: http://localhost:88/samples/authenticate?Username=ricks&Password=sekrit it works just fine. The query string values are mapped to the username and password parameters of our API method. But if you now change the method to work with [HttpPost] instead like this:[HttpPost] public HttpResponseMessage Authenticate(string username, string password) { …} and hit it with a POST HTTP Request like this: POST http://localhost:88/samples/authenticate HTTP/1.1 Host: localhost:88 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Content-type: application/x-www-form-urlencoded Content-Length: 30 Username=ricks&Password=sekrit you'll find that while the request works, it doesn't actually receive the two string parameters. The username and password parameters are null and so the method is definitely going to fail. When I mentioned this over Twitter a few days ago I got a lot of responses back of why I'd want to do this in the first place - after all HTML Form submissions are the domain of MVC and not WebAPI which is a valid point. However, the more common use case is using POST Variables with AJAX calls. The following is quite common for passing simple values:$.post(url,{ Username: "Rick", Password: "sekrit" },function(result) {…}); but alas that doesn't work. How ASP.NET Web API handles Content Bodies Web API supports parsing content data in a variety of ways, but it does not deal with multiple posted content values. In effect you can only post a single content value to a Web API Action method. That one parameter can be very complex and you can bind it in a variety of ways, but ultimately you're tied to a single POST content value in your parameter definition. While it's possible to support multiple parameters on a POST/PUT operation, only one parameter can be mapped to the actual content - the rest have to be mapped to route values or the query string. Web API treats the whole request body as one big chunk of data that is sent to a Media Type Formatter that's responsible for de-serializing the content into whatever value the method requires. The restriction comes from async nature of Web API where the request data is read only once inside of the formatter that retrieves and deserializes it. Because it's read once, checking for content (like individual POST variables) first is not possible. However, Web API does provide a couple of ways to access the form POST data: Model Binding - object property mapping to bind POST values FormDataCollection - collection of POST keys/values ModelBinding POST Values - Binding POST data to Object Properties The recommended way to handle POST values in Web API is to use Model Binding, which maps individual urlencoded POST values to properties of a model object provided as the parameter. Model binding requires a single object as input to be bound to the POST data, with each POST key that matches a property name (including nested properties like Address.Street) being mapped and updated including automatic type conversion of simple types. This is a very nice feature - and a familiar one from MVC - that makes it very easy to have model objects mapped directly from inbound data. The obvious drawback with Model Binding is that you need a model for it to work: You have to provide a strongly typed object that can receive the data and this object has to map the inbound data. To rewrite the example above to use ModelBinding I have to create a class maps the properties that I need as parameters:public class LoginData { public string Username { get; set; } public string Password { get; set; } } and then accept the data like this in the API method:[HttpPost] public HttpResponseMessage Authenticate(LoginData login) { string username = login.Username; string password = login.Password; … } This works fine mapping the POST values to the properties of the login object. As a side benefit of this method definition, the method now also allows posting of JSON or XML to the same endpoint. If I change my request to send JSON like this: POST http://localhost:88/samples/authenticate HTTP/1.1 Host: localhost:88 Accept: application/jsonContent-type: application/json Content-Length: 40 {"Username":"ricks","Password":"sekrit"} it works as well and transparently, courtesy of the nice Content Negotiation features of Web API. There's nothing wrong with using Model binding and in fact it's a common practice to use (view) model object for inputs coming back from the client and mapping them into these models. But it can be  kind of a hassle if you have AJAX applications with a ton of backend hits, especially if many methods are very atomic and focused and don't effectively require a model or view. Not always do you have to pass structured data, but sometimes there are just a couple of simple response values that need to be sent back. If all you need is to pass a couple operational parameters, creating a view model object just for parameter purposes seems like overkill. Maybe you can use the query string instead (if that makes sense), but if you can't then you can often end up with a plethora of 'message objects' that serve no further  purpose than to make Model Binding work. Note that you can accept multiple parameters with ModelBinding so the following would still work:[HttpPost] public HttpResponseMessage Authenticate(LoginData login, string loginDomain) but only the object will be bound to POST data. As long as loginDomain comes from the querystring or route data this will work. Collecting POST values with FormDataCollection Another more dynamic approach to handle POST values is to collect POST data into a FormDataCollection. FormDataCollection is a very basic key/value collection (like FormCollection in MVC and Request.Form in ASP.NET in general) and then read the values out individually by querying each. [HttpPost] public HttpResponseMessage Authenticate(FormDataCollection form) { var username = form.Get("Username"); var password = form.Get("Password"); …} The downside to this approach is that it's not strongly typed, you have to handle type conversions on non-string parameters, and it gets a bit more complicated to test such as setup as you have to seed a FormDataCollection with data. On the other hand it's flexible and easy to use and especially with string parameters is easy to deal with. It's also dynamic, so if the client sends you a variety of combinations of values on which you make operating decisions, this is much easier to work with than a strongly typed object that would have to account for all possible values up front. The downside is that the code looks old school and isn't as self-documenting as a parameter list or object parameter would be. Nevertheless it's totally functionality and a viable choice for collecting POST values. What about [FromBody]? Web API also has a [FromBody] attribute that can be assigned to parameters. If you have multiple parameters on a Web API method signature you can use [FromBody] to specify which one will be parsed from the POST content. Unfortunately it's not terribly useful as it only returns content in raw format and requires a totally non-standard format ("=content") to specify your content. For more info in how FromBody works and several related issues to how POST data is mapped, you can check out Mike Stalls post: How WebAPI does Parameter Binding Not really sure where the Web API team thought [FromBody] would really be a good fit other than a down and dirty way to send a full string buffer. Extending Web API to make multiple POST Vars work? Don't think so Clearly there's no native support for multiple POST variables being mapped to parameters, which is a bit of a bummer. I know in my own work on one project my customer actually found this to be a real sticking point in their AJAX backend work, and we ended up not using Web API and using MVC JSON features instead. That's kind of sad because Web API is supposed to be the proper solution for AJAX backends. With all of ASP.NET Web API's extensibility you'd think there would be some way to build this functionality on our own, but after spending a bit of time digging and asking some of the experts from the team and Web API community I didn't hear anything that even suggests that this is possible. From what I could find I'd say it's not possible primarily because Web API's Routing engine does not account for the POST variable mapping. This means [HttpPost] methods with url encoded POST buffers are not mapped to the parameters of the endpoint, and so the routes would never even trigger a request that could be intercepted. Once the routing doesn't work there's not much that can be done. If somebody has an idea how this could be accomplished I would love to hear about it. Do we really need multi-value POST mapping? I think that that POST value mapping is a feature that one would expect of any API tool to have. If you look at common APIs out there like Flicker and Google Maps etc. they all work with POST data. POST data is very prominent much more so than JSON inputs and so supporting as many options that enable would seem to be crucial. All that aside, Web API does provide very nice features with Model Binding that allows you to capture many POST variables easily enough, and logistically this will let you build whatever you need with POST data of all shapes as long as you map objects. But having to have an object for every operation that receives a data input is going to take its toll in heavy AJAX applications, with a lot of types created that do nothing more than act as parameter containers. I also think that POST variable mapping is an expected behavior and Web APIs non-support will likely result in many, many questions like this one: How do I bind a simple POST value in ASP.NET WebAPI RC? with no clear answer to this question. I hope for V.next of WebAPI Microsoft will consider this a feature that's worth adding. Related Articles Passing multiple POST parameters to Web API Controller Methods Mike Stall's post: How Web API does Parameter Binding Where does ASP.NET Web API Fit?© Rick Strahl, West Wind Technologies, 2005-2012Posted in Web Api   Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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  • Working with Legacy code #1 : Draw up a plan.

    - by andrewstopford
    Blackfield applications are a minefield, reaking of smells and awash with technical debt. The codebase is a living hell. Your first plan of attack is a plan. Your boss (be that you, your manager, your client or whoever) needs to understand what you are trying to achieve and in what time. Your team needs to know what the plan of attack will be and where. Start with the greatest pain points, what are the biggest areas of technical debt, what takes the most time to work with\change and where are the areas with the higest number of defects. Work out what classes\functions are mud balls and where all the hard dependencies are. In working out the pain points you will begin to understand structure (or lack of) and where the fundmentals are. If know one in the team knows an area then profile it, understand what lengths the code is going to.  When your done drawing up the list then work out what the common problems are, is the code hard tied to the database, file system or some other hard dependency. Is the code repeating it's self in structure\form over and over etc. From the list work out what are the areas with the biggest number of problems and make those your starting point. Now you have a plan of what needs to change and where then you can work out how it fits into your development plan. Manage your plan, put it into a defect tracker, work item tracker or use notepad or excel etc. Mark off the items on your plan as and when you have attacked them, if you find more items then get them on your plan, keep the movement going and slowly the codebase will become better and better.

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  • ODI 11g – Scripting Repository Creation

    - by David Allan
    Here’s a quick post on how to create both master and work repositories in one simple dialog, its using the groovy capabilities in ODI 11g and the groovy swing builder components. So if you want more/less take the groovy script and change, its easy stuff. The groovy script odi_create_repos.groovy is here, just open it in ODI before connecting and you will be able to create both master and work repositories with ease – or check the groovy out and script your own automation – you can construct the master, work and runtime repositories, so if you are embedding ODI as your DI engine this may be very useful. When you click ‘Create Repository’ you will see the following in the log as the master repository starts to be created; ====================================================== Repository Creation Started.... ====================================================== Master Repository Creation Started.... Then the completion message followed by the work repository creation and final completion message. Master Repository Creation Completed. Work Repository Creation Started. Work Repository Creation Completed. ====================================================== Repository Creation Completed Successfully ====================================================== Script exited. If any error is hit, the script just exits and prints any error to the log. For example if I enter no passwords, I will get this error; ====================================================== Repository Creation Started.... ====================================================== Master Repository Creation Started.... ====================================================== Repository Creation Complete in Error ====================================================== oracle.odi.setup.RepositorySetupException: oracle.odi.core.security.PasswordPolicyNotMatchedException: ODI-10189: Password policy MinPasswordLength is not matched. ====================================================== Script exited. This is another example of using the ODI 11g SDK showing how to automate the construction of your data integration environment. The main interfaces and classes used here are IMasterRepositorySetup / MasterRepositorySetupImpl and IWorkRepositorySetup / WorkRepositorySetupImpl.

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  • ODI 11g – Scripting Repository Creation

    - by David Allan
    Here’s a quick post on how to create both master and work repositories in one simple dialog, its using the groovy capabilities in ODI 11g and the groovy swing builder components. So if you want more/less take the groovy script and change, its easy stuff. The groovy script odi_create_repos.groovy is here, just open it in ODI before connecting and you will be able to create both master and work repositories with ease – or check the groovy out and script your own automation – you can construct the master, work and runtime repositories, so if you are embedding ODI as your DI engine this may be very useful. When you click ‘Create Repository’ you will see the following in the log as the master repository starts to be created; ====================================================== Repository Creation Started.... ====================================================== Master Repository Creation Started.... Then the completion message followed by the work repository creation and final completion message. Master Repository Creation Completed. Work Repository Creation Started. Work Repository Creation Completed. ====================================================== Repository Creation Completed Successfully ====================================================== Script exited. If any error is hit, the script just exits and prints any error to the log. For example if I enter no passwords, I will get this error; ====================================================== Repository Creation Started.... ====================================================== Master Repository Creation Started.... ====================================================== Repository Creation Complete in Error ====================================================== oracle.odi.setup.RepositorySetupException: oracle.odi.core.security.PasswordPolicyNotMatchedException: ODI-10189: Password policy MinPasswordLength is not matched. ====================================================== Script exited. This is another example of using the ODI 11g SDK showing how to automate the construction of your data integration environment. The main interfaces and classes used here are IMasterRepositorySetup / MasterRepositorySetupImpl and IWorkRepositorySetup / WorkRepositorySetupImpl.

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  • Bridging The Gap Between Developers And Testers With VS 2010

    - by Vincent Grondin
    On January 29th Etienne Tremblay and I presented infront of roughly 120 people in Ottawa a 7 hours "sketch" on how VS 2010 and TFS 2010 can help both devs and testers in their respective work.  The presentation focused on how a testers' work can positively influence a developers' work and vice versa.  The format was quite unusual as I said it's a "sketch" where Etienne and I "ignore" the audience and we do as if we were at work and the audience is sort of "spying" on us.  In all I'm quite pleased with the content we presented and the format sure was alot of fun to render and I think the audience liked it too...  The good news for you people reading this post is that it got RECORDED and it's now available for download in quick 25 to 35 minutes format on the dev teach web site:  http://www.devteach.com/ALM-TFS2010-Bridgingthegap.aspx   There where 2 cameras, one filming us and one capturing the screen for our demos.  We switch from one to another in an intersting flow and Jean-René Roy made sure he kept all our goofs and didn't edit those funny "oups moments" where we screw-up in the scenario...  Mostly educative but hilarious at times !!! I encourage you all to download and watch the 13 episodes...  Follow a day at work for a tester and a developper using VS 2010 and TFS 2010 to improve their chemistry !  Thanks to Jean-René Roy for all the work he's put into this event and to Microsoft and Pyxis for sponsoring the event.

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  • #altnetseattle &ndash; Collaboration, Why is it so hard!

    - by GeekAgilistMercenary
    The session convened and we began a discussion about why collaboration is so hard. To work together in software better us engineers have to overcome traditional software approaches (silos of work) and the human element of tending to go off in a corner to work through an issue. It was agreed upon that software engineers are jack asses of jack assery. Breaking down the stoic & silent types by presenting a continuous enthusiasm until the stoic and silent types break down and open up to the group.  Knowing it is ok to ask the dumb question or work through basic things once in a while. Non-work interactions are pivotal to work related collaboration. Collaboration is mostly autonomous of process (i.e. Agile or Waterfall) Latency time should be minimal in the feedback loop for software development. Collaboration is enhanced by Agile Ideals, and things like Scrum or Lean Process. Agile is not a process, Lean and Scrum are process.  Agile is an ideal. Lean, Agile, Scrum, Waterfall, Six Sigma, CMMI, oh dear. . . Great session.  Off to the next session and more brain crunching. . . weeeeeeee!

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  • How to disable "N" Wireless Mode RTL8192 (Thinkpad Edge 15 Core i5) in natty

    - by Gustavo Rubio
    I've seen many owners of thinkpad edges which are supossed to be linux-friendly having problems with wireless adapter. I've found several links inside askubuntu and in ubuntuforums which have a lot of work-arounds for those problems, mine seems to be wierd though. I use my laptop on both my office and at home. At home I have a router which is A/B/G and here at home the wireless connection works just fine, using a WEP key. But in work I have a B/G/N wireless router and it doesn't work, my guess is that this adapter works with N modes but somehow this is buggy in the bundled driver in natty. I've tried to disable the "N" mode in the router but that didn't work. Later I went to realtek website, downloaded their driver and compiled myself, kinda seems to work most of the time but sometimes some websites keep trying to load or load just parts of it and images start to look like their links are broken and so on, much like what you get when you were loading a page and suddenly the connection is lost. This problem, as I said, is only using the realtek driver from their website. Dmesg gives me this a lot of these: [ 5869.049454] rtl8192se_update_ratr_table: ratr_index=0 ratr_table=0x00000ff5 [ 5879.240563] DHCP pkt src port:68, dest port:67!! So I thougth I might as well switch back to the original driver which seems to work just fine on A/B/G wireless networks but not on N networks so if anybody knows how to disable that mode from within the driver please let us know :) Thanks in advance! PS: I do found a link to a similar question and it was answered but let me remind you I'm NOT using the intel version of wireless for my thinkpad but the realtek (RTL8192SvB)

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  • Oracle at Information Security and Risk Management Conference (ISACA Conferences)

    - by Tanu Sood
    The North America Information Security and Risk Management (ISRM) Conference hosted by ISACA will be held this year from November 14 - 16 in Las Vegas, Nevada and Oracle is a platinum sponsor. The ISRM / IT GRC event is not only designed to meet the exact needs of information security, governance, compliance and risk management professionals like you, but also gives you the tools you need to solve the issues you currently face. The event builds on and includes the key elements of information security, governance, compliance and risk management practices, and offers a fresh perspective on current and future trends. As a Platinum Sponsor Oracle will not only have an opportunity to demonstrate but talk through our strategic roadmap and support to ensure all organizations understand our key role within the industry to ensure corporate data and information remains safe. Join us at the Lunch and Learn to learn more about the latest advances in Oracle Identity Management. Lunch and Learn Session: Trends in Identity Management Speaker: Mike Neuenschwander, Senior Product Development Director, Oracle Identity Management As enterprises embrace mobile and social applications, security and audit have moved into the foreground. The way we work and connect with our customers is changing dramatically and this means, re-thinking how we secure the interaction and enable the experience. Work is an activity not a place - mobile access enables employees to work from any device anywhere and anytime. Organizations are utilizing "flash teams" - instead of a dedicated group to solve problems, organizations utilize more cross-functional teams. Work is now social - email collaboration will be replaced by dynamic social media style interaction. In this session, we will examine these three secular trends and discuss how organizations can secure the work experience and adapt audit controls to address the "new work order". We also recommend you bookmark the following session: T1 Session 301: Gone in 60 Seconds: Mitigating Database Security Risk Friday, November 16, 8:30 am – 9:30 am And, do be sure to stop by our booth, # 100 & #102, to not only network with our Product Development Team, but also get an onsite demonstration of Oracle Security Solutions. See you there? ISRM /  IT GRC November 14 – 16, 2012 Mirage Casino-Hotel 3400 Las Vegas Boulevard South Las Vegas, NV, 89109

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  • What relationship do software Scrum or Lean have to industrial engineering concepts like theory of constraints?

    - by DeveloperDon
    In Scrum, work is delivered to customers through a series of sprints in which project work is time boxed to a fixed number of days or weeks, usually 30 days. In lean software development, the goal is to deliver as soon as possible, permitting early feedback for the next iteration. Both techniques stress the importance of workflow in which software work product does not accumulate in development awaiting release at some future date. Both permit new or refined requirements and feedback from QA and customers to be acted on with as little delay as possible based on priority. A few years ago I heard a lecture where the speaker talked briefly about a family of concepts from industrial engineering called theory of constraints. In the factory, they use an operations model based on three components: drum, buffer, and rope. The drum synchronizes work product as it flows through the system. Buffers that protect the system by holding output from one stage as it waits to be consumed by the next. The rope pulls product from one work station to the next. Historically, are these ideas part of the heritage of Scrum and Lean, or are they on a separate track? It we wanted to think about Scrum and Lean in terms of drum-buffer-rope, what are the parts? Drum = {daily scrum meeting, monthly release)? Buffer = {burn down list, source control system)? Rope = { daily meeting, constant integration server, monthly releases}? Industrial engineers define work flow in terms of different kinds of factories. I-Factories: straight pipeline. One input, one output. A-Factories: many inputs and one output. V-Factories: one input, many output products. T-Plants: many inputs, many outputs. If it applies, what kind of factory is most like Scrum or Lean and why?

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  • SharePoint 2010 in the cloud a.k.a. SharePoint Online

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). There are 3 ways to run SharePoint On premises, you buy the servers, and you run the servers. Hosted servers, where you don’t run the servers, but you let a hosting company run dedicated servers. Multi-tenant, like SharePoint online – this is what I am talking about in this blog post. Also known as SaaS (Software as a Service). The advantages of a cloud solution are undeniable. Availability, (SharePoint line offers a 99.9% uptime SLA) Reliability. Cost. Due to economies of scale, and no need to hire specialized dedicated staff. Scalability. Security. Flexibility – grow or shrink as you need to. If you are seriously considering SharePoint 2010 in the cloud, there are some things you need to know about SharePoint online. What will work - OOTB Customization, collaboration features etc. will work SharePoint Designer 2010 is supported, so no code workflows will work Visual Studio sandbox solutions, client object model will work. What won’t work - SharePoint 2010 online cloud environment supports only sandbox solutions. BCS, business connectivity services is not supported in SharePoint online. What you can do however is to host your services in Azure, and call them using Silverlight. Custom timer jobs will not work. Long story short, get used to Sandbox solutions – and the new way of programming. Sandbox solutions are pretty damn good. Most of the complaints I have heard around sandbox solutions being too restrictive, are uninformed mechanisms of doing things mired in the ways of 2002. .. or you could just live in 2002 too. Comment on the article ....

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  • An Oracle's Interns Story by Samarth Varshney

    - by user769227
    I have written a short write-up about my experience at Oracle and am attaching some pics along:  I joined Oracle on 5th January 2011 as part of my internship program in BITS Pilani Goa Campus. In the short period of six months, I had the most beautiful and interesting time of my life. It was fun to work in Oracle, thanks to the whole team. I had an excellent manager, simple and sophisticated, who gave me the utmost enthusiasm to work. I gained a lot of knowledge during my internship, thanks to my colleagues. They were very helpful and motivated us (interns) in every possible way. In the initial stages of work, in which you know almost nothing, they helped me gain knowledge at a rapid speed. Thanks to the vast database of study material at the Oracle site, that I could start on with my project in a very short time.  For me, the time flew like anything and made the 6 months look like a few days. It was probably due to the team, that the work was so much fun. We had our deadlines but had full freedom as to how to work and when to work. I don't remember a single instance, in which I was working and not listening to songs. I mean it will always be a time to remember. I hope to join this company and make this time last forever.  Samarth 

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  • Interfaces on an abstract class

    - by insta
    My coworker and I have different opinions on the relationship between base classes and interfaces. I'm of the belief that a class should not implement an interface unless that class can be used when an implementation of the interface is required. In other words, I like to see code like this: interface IFooWorker { void Work(); } abstract class BaseWorker { ... base class behaviors ... public abstract void Work() { } protected string CleanData(string data) { ... } } class DbWorker : BaseWorker, IFooWorker { public void Work() { Repository.AddCleanData(base.CleanData(UI.GetDirtyData())); } } The DbWorker is what gets the IFooWorker interface, because it is an instantiatable implementation of the interface. It completely fulfills the contract. My coworker prefers the nearly identical: interface IFooWorker { void Work(); } abstract class BaseWorker : IFooWorker { ... base class behaviors ... public abstract void Work() { } protected string CleanData(string data) { ... } } class DbWorker : BaseWorker { public void Work() { Repository.AddCleanData(base.CleanData(UI.GetDirtyData())); } } Where the base class gets the interface, and by virtue of this all inheritors of the base class are of that interface as well. This bugs me but I can't come up with concrete reasons why, outside of "the base class cannot stand on its own as an implementation of the interface". What are the pros & cons of his method vs. mine, and why should one be used over another?

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  • License compatibility question

    - by Ivaylo Slavov
    I have a question regarding software licenses. I plan to put a license to a framework that I have written. My intention is that the license should be open, in order to maintain a community. Also I want to control when a new version is released and which changes will be included. The license should allow the framework to be used with commercial products, therefore respecting their own license. I have done some quick research and I decided to double license my work under the Apache License 2.0 (ASL) and Eclipse Public License (EPL). My point is that the EPL will provide me the ability to control the release cycle as well as the contributions to the project and the Apache license will take care for any patents a 3rd party might want to use in a derived work. Also both are open licenses. My question is related to the GLP and LGPL licenses. If I have the above licenses to my framework, will it be possible and legal, for someone to create a derived work of my framework, that is also a derived work of, or links a library that is under the LGPL license? Thanks in advance. EDIT: To be clear I will explain how I expect things to work. The framework will define some common API for certain functionalities as well as a Wrapper class that will invoke an implementation of that API. The Wrapper will be part of the framework, but it will internally call the actual implementation. This implementation should be in a separate library, and such libraries I would like to be developed and maintained by community. Surely the community will have to access the framework but I want to limit changes to the framework by the community but I want to provide freedom for any API implementation (a derived work of the framework). The framework will enable flexible configuration mechanisms that will tell which implementation of an API will be used.

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  • VS2008 C# error ".ctor' not supported by language

    - by Jim Jones
    C# code: class Program { static void Main(string[] args) { TFWrapper tf; String lexDir = "......."; String lic = "........"; String key = "........."; ArrayList cats = new ArrayList(); Boolean useConj = false; String lang = "english"; String encoding = "auto"; tf = new TFWrapper(lexDir, lic, key, useConj, lang, encoding); } } Managed C++ method being called: TFWrapper::TFWrapper(String^ mlexDir, String^ mlic, String^ mkey, ArrayList catList, Boolean^ m_useConj, String^ m_lang, String^ m_encoding); Getting '.ctor' is not supported by the language error on the last line of C#

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  • bind a WPF datagrid to a datatable

    - by Jim Thomas
    I have used the marvelous example posted at: http://www.codeproject.com/KB/WPF/WPFDataGridExamples.aspx to bind a WPF datagrid to a datatable. The source code below compiles fine; it even runs and displays the contents of the InfoWork datatable in the wpf datagrid. Hooray! But the WPF page with the datagrid will not display in the designer. I get an incomprehensible error instead on my design page which is shown at the end of this posting. I assume the designer is having some difficulty instantiating the dataview for display in the grid. How can I fix that? XAML Code: xmlns:local="clr-namespace:InfoSeeker" <Window.Resources> <ObjectDataProvider x:Key="InfoWorkData" ObjectType="{x:Type local:InfoWorkData}" /> <ObjectDataProvider x:Key="InfoWork" ObjectInstance="{StaticResource InfoWorkData}" MethodName="GetInfoWork" /> </Window.Resources> <my:DataGrid DataContext="{Binding Source={StaticResource InfoWork}}" AutoGenerateColumns="True" ItemsSource="{Binding}" Name="dataGrid1" xmlns:my="http://schemas.microsoft.com/wpf/2008/toolkit" /> C# Code: namespace InfoSeeker { public class InfoWorkData { private InfoTableAdapters.InfoWorkTableAdapter infoAdapter; private Info infoDS; public InfoWorkData() { infoDS = new Info(); infoAdapter = new InfoTableAdapters.InfoWorkTableAdapter(); infoAdapter.Fill(infoDS.InfoWork); } public DataView GetInfoWork() { return infoDS.InfoWork.DefaultView; } } } Error shown in place of the designer page which has the grid on it: An unhandled exception has occurred: Type 'MS.Internal.Permissions.UserInitiatedNavigationPermission' in Assembly 'PresentationFramework, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' is not marked as serializable. at System.Runtime.Serialization.FormatterServices.InternalGetSerializableMembers(RuntimeType type) at System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context) at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo() at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter) ...At:Ms.Internal.Designer.DesignerPane.LoadDesignerView()

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  • Using parameters in reports for VIsual Studio 2008

    - by Jim Thomas
    This is my first attempt to create a Visual Studio 2008 report using parameters. I have created the dataset and the report. If I run it with a hard-coded filter on a column the report runs fine. When I change the filter to '?' I keep getting this error: No overload for method 'Fill' takes '1' argument Obviously I am missing some way to connect the parameter on the dataset to a report parameter. I have defined a report parameter using the Report/Report Parameter screen. But how does that report parameter get tied to the dataset table parameter? Is there a special naming convention for the parameter? I have Googled this a half dozen times and read the msdn documentation but the examples all seem to use a different approach (like creating a SQL query rather then a table based dataset) or entering the parameter name as "=Parameters!name.value" but I can't figure out where to do that. One msdn example suggestted I needed to create some C# code using a SetParameters() method to make the connection. Is that how it is done? If anyone can recommend a good walk-through I'd appreciate it. Edit: After more reading it appears I don't need report parameters at all. I am simply trying to add a parameter to the database query. So I would create a text box on the form, get the user's input, then apply that parameter programmatically to the fill() argument list. The report parameter on the other hand is an ad-hoc value generally entered by a user that you want to appear on the report. But there is no relationship between report parameters and query/dataset parameters. Is that correct?

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  • LinkedIn API returns 'Unauthorized' response (PHP OAuth)

    - by Jim Greenleaf
    I've been struggling with this one for a few days now. I've got a test app set up to connect to LinkedIn via OAuth. I want to be able to update a user's status, but at the moment I'm unable to interact with LinkedIn's API at all. I am able to successfully get a requestToken, then an accessToken, but when I issue a request to the API, I see an 'unauthorized' error that looks something like this: object(OAuthException)#2 (8) { ["message:protected"]=> string(73) "Invalid auth/bad request (got a 401, expected HTTP/1.1 20X or a redirect)" ["string:private"]=> string(0) "" ["code:protected"]=> int(401) ["file:protected"]=> string(47) "/home/pmfeorg/public_html/dev/test/linkedin.php" ["line:protected"]=> int(48) ["trace:private"]=> array(1) { [0]=> array(6) { ["file"]=> string(47) "/home/pmfeorg/public_html/dev/test/linkedin.php" ["line"]=> int(48) ["function"]=> string(5) "fetch" ["class"]=> string(5) "OAuth" ["type"]=> string(2) "->" ["args"]=> array(2) { [0]=> string(35) "http://api.linkedin.com/v1/people/~" [1]=> string(3) "GET" } } } ["lastResponse"]=> string(358) " 401 1276375790558 0000 [unauthorized]. OAU:Bhgk3fB4cs9t4oatSdv538tD2X68-1OTCBg-KKL3pFBnGgOEhJZhFOf1n9KtHMMy|48032b2d-bc8c-4744-bb84-4eab53578c11|*01|*01:1276375790:xmc3lWhXJvLSUZh4dxMtrf55VVQ= " ["debugInfo"]=> array(5) { ["sbs"]=> string(329) "GET&http%3A%2F%2Fapi.linkedin.com%2Fv1%2Fpeople%2F~&oauth_consumer_key%3DBhgk3fB4cs9t4oatSdv538tD2X68-1OTCBg-KKL3pFBnGgOEhJZhFOf1n9KtHMMy%26oauth_nonce%3D7068001084c13f2ee6a2117.22312548%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1276375790%26oauth_token%3D48032b2d-bc8c-4744-bb84-4eab53578c11%26oauth_version%3D1.0" ["headers_sent"]=> string(401) "GET /v1/people/~?GET&oauth_consumer_key=Bhgk3fB4cs9t4oatSdv538tD2X68-1OTCBg-KKL3pFBnGgOEhJZhFOf1n9KtHMMy&oauth_signature_method=HMAC-SHA1&oauth_nonce=7068001084c13f2ee6a2117.22312548&oauth_timestamp=1276375790&oauth_version=1.0&oauth_token=48032b2d-bc8c-4744-bb84-4eab53578c11&oauth_signature=xmc3lWhXJvLSUZh4dxMtrf55VVQ%3D HTTP/1.1 User-Agent: PECL-OAuth/1.0-dev Host: api.linkedin.com Accept: */*" ["headers_recv"]=> string(148) "HTTP/1.1 401 Unauthorized Server: Apache-Coyote/1.1 Date: Sat, 12 Jun 2010 20:49:50 GMT Content-Type: text/xml;charset=UTF-8 Content-Length: 358" ["body_recv"]=> string(358) " 401 1276375790558 0000 [unauthorized]. OAU:Bhgk3fB4cs9t4oatSdv538tD2X68-1OTCBg-KKL3pFBnGgOEhJZhFOf1n9KtHMMy|48032b2d-bc8c-4744-bb84-4eab53578c11|*01|*01:1276375790:xmc3lWhXJvLSUZh4dxMtrf55VVQ= " ["info"]=> string(216) "About to connect() to api.linkedin.com port 80 (#0) Trying 64.74.98.83... connected Connected to api.linkedin.com (64.74.98.83) port 80 (#0) Connection #0 to host api.linkedin.com left intact Closing connection #0 " } } My code looks like this (based on the FireEagle example from php.net): $req_url = 'https://api.linkedin.com/uas/oauth/requestToken'; $authurl = 'https://www.linkedin.com/uas/oauth/authenticate'; $acc_url = 'https://api.linkedin.com/uas/oauth/accessToken'; $api_url = 'http://api.linkedin.com/v1/people/~'; $callback = 'http://www.pmfe.org/dev/test/linkedin.php'; $conskey = 'Bhgk3fB4cs9t4oatSdv538tD2X68-1OTCBg-KKL3pFBnGgOEhJZhFOf1n9KtHMMy'; $conssec = '####################SECRET KEY#####################'; session_start(); try { $oauth = new OAuth($conskey,$conssec,OAUTH_SIG_METHOD_HMACSHA1,OAUTH_AUTH_TYPE_URI); $oauth->enableDebug(); if(!isset($_GET['oauth_token'])) { $request_token_info = $oauth->getRequestToken($req_url); $_SESSION['secret'] = $request_token_info['oauth_token_secret']; header('Location: '.$authurl.'?oauth_token='.$request_token_info['oauth_token']); exit; } else { $oauth->setToken($_GET['oauth_token'],$_SESSION['secret']); $access_token_info = $oauth->getAccessToken($acc_url); $_SESSION['token'] = $access_token_info['oauth_token']; $_SESSION['secret'] = $access_token_info['oauth_token_secret']; } $oauth->setToken($_SESSION['token'],$_SESSION['secret']); $oauth->fetch($api_url, OAUTH_HTTP_METHOD_GET); $response = $oauth->getLastResponse(); } catch(OAuthException $E) { var_dump($E); } I've successfully set up a connection to Twitter and one to Facebook using OAuth, but LinkedIn keeps eluding me. If anyone could offer some advice or point me in the right direction, I will be extremely appreciative!

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  • Location of Java dump heap file?

    - by Jim Ferrans
    Well this is embarrassing ... I'm starting to play with the Eclipse Memory Analyzer to look for Java memory leaks on a Windows box. Step 1 is to obtain a heap dump file. To do this< I start my Java (javaw.exe) process from within Eclipse and connect to it with jconsole. Then on the jconsole MBeans tab I click the dumpHeap button. The first time I did this, I saw a pop-up saying it had created the heap dump file, but not giving its name or location. Now whenever I do a dumpHeap again while connected to a different javaw.exe process, jconsole says: Problem invoking dumpHeap : java.io.IOException: File exists and of course doesn't give its name or path. Where could it be? I've searched my C: drive (using cygwin command line tools) for files containing "hprof" or "java_pid" or "heapdump" and didn't find anything plausible. I've even used the Windows search to look for all files in my Eclipse workspace that have changed in the last day. I'm using the Sun Java 1.6 JVM, and don't have -XX:HeapDumpPath set.

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