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• Member variable pointers to COM objects

  - by drelihan

  Hi Folks, Is there any problem with keeping member variable pointer refernces to COM objects and reussing the reference through out the class in C++. Is anybody aware of a reason why you would want to call .CreateInstance every time you wanted a to use the COM object i.e. you were getting a fresh instance each time. I cannot see any reason who you would want to do this, Thanks, (No is an acceptable answer!!!)

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• VMWare Workstation Linux Host performance tuning

  - by Hoghweed

  I need to improve my linux hosted vmware workstation for using multiple virtual machines at the same time. I feel very stupid I lost a great blog post link which I found last month (and I'm not able to find it again..) so I try to ask here if anyone can help me: This is my host (laptop): 16GB DDR3 Ram HDD Hybrid 750GB 7200 (8GB SSD Cache) Mint 15 x64 Kernel 3.9.7 swappiness set to 10 The above are the important things about the host. So, My need is the ability to run 2 or 3 VMs at the same time. The lack of performance is about the disk, The last time from that blog post I lost, I setup /tmp to be mounted ad a memory partition and in my previous installation that was good, now I'm not able to find a good solution to tweak the things. I think with 16GB o RAM there will be no problems to run multiple VMs, but whe they start to swap or use the /tmp things going bad (guest cursor going too fast after a freeze, guest freeze and so on) Anyone can help me to fit a good host tweak and configuration to get better performance? Thanks in advance

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• Defining the context of a word - Python

  - by RadiantHex

  Hi folks, I think this is an interesting question, at least for me. I have a list of words, let's say: photo, free, search, image, css3, css, tutorials, webdesign, tutorial, google, china, censorship, politics, internet and I have a list of contexts: Programming World news Technology Web Design I need to try and match words with the appropriate context/contexts if possible. Maybe discovering word relationships in some way. Any ideas? Help would be much appreciated!

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• Flex DownloadProgressBar preloader override

  - by Shawn Simon

  I'm watching this video, which is pretty good http://www.gotoandlearn.com/play?id=108 It shows how to inherit from DownloadProgressBar to create a customer preloader for your flex app. The DownloadProgressBar class has an overridable getter for the property 'preloader.' Isn't this poor design? What does a property called preloader have anything to do with a class for a DownloadProgressBar?

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• Javafx - Clipview to a Group?

  - by Chris-NTA

  Can I apply clipview to a vertical expanding Group? Time to time I'm appending text to a group and want to use scrollbar to navigate in that group. The scrollbar part is working when I assign it to the group itself but want to limit the size of the group by using clipview. Anyone having experience in this?

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• Is there any way to monitor the number of CAS stackwalks that are occurring?

  - by Anonymous

  I'm working with a time sensitive desktop application that uses p/invoke extensively, and I want to make sure that the code is not wasting a lot of time on CAS stackwalks. I have used the SuppressUnmanagedCodeSecurity attribute where I think it is necessary, but I might have missed a few places. Does anyone know if there is a way to monitor the number of CAS stackwalks that are occurring, and better yet pinpoint the source of the security demands?

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• JBoss Seam - order event listeners

  - by Walter White

  Hi all, I would like to order my event listeners. Is it possible to do this in JBoss Seam 2.x? I am thinking as a workaround, which is quite simple, I will just daisy chain my events: fire event A. do something on event A. a. fire event B do something on event B. Any comments with this design? Is this a good / bad practice? Thanks, Walter

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• Why does deploying a .NET Compact Framework assembly cause .NET Desktop Framework assemblies to be d

  - by Matthew Belk

  I am trying to get one of my developers set up to work on a fairly large .NETCF project. When we try to simply deploy the solution and all of its projects to a target device, deploying one of the projects triggers several assemblies from the desktop framework to be copied from the GAC to the device. What on earth could cause this? The assemblies from the "big" framework are ones like System.DirectoryServices, System.Design, and a bunch of others.

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• Dynamic content with jQuery ui, unique tab active state

  - by kielie

  Hi guys, I would like to create a jQuery menu with dynamic content using the jQuery ui. My question is, I have images for tabs, and each one is different, so each one's roll over is different, how could I design it to display each unique tab's active state when that specific tab is clicked? Thanx in advance!

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• difference between Convert.ToInt32 and (int)

  - by balalakshmi

  the following syntax throws an compile time error like Cannot convert type 'string' to 'int' string name=(Session["name1"].ToString()); int i = (int)name; whereas the code below compiles and executes successfully string name=(Session["name1"].ToString()); int i = Convert.ToInt32(name); I would like to know 1) why the compile time error occurs in first code 2) what's the difference between the 2 code snippets

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• Unit testing Jade

  - by Strawberry

  Hi, What techniques and design strategies have people used to aid in unit testing Jade applications? In particular, how do people typically go about testing Behaviours - which are tightly coupled to the Agent instance and the Jade environment? I'm aware of the JadeMX project, but this appears to be geared more towards system testing - in particular the message exchange between collaborating agents. Thanks.

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• Scalable Ticketing / Festival Website

  - by Luke Lowrey

  I've noticed major music festivals (at least in Australia) and other events that experience a peak in traffic when tickets go on sale have huge problems keeping their websites running well. I've seen a few different techniques used to try combat this such as short sessions and virtual queues but they dont seem to have much effect. If you were to design a website to sell a lot of tickets in a short amount of time how would you handle scalability? What technologies and programming techniques would you use?

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• Correct way of using/testing event service in Eclipse E4 RCP

  - by Thorsten Beck

  Allow me to pose two coupled questions that might boil down to one about good application design ;-) What is the best practice for using event based communication in an e4 RCP application? How can I write simple unit tests (using JUnit) for classes that send/receive events using dependency injection and IEventBroker ? Let’s be more concrete: say I am developing an Eclipse e4 RCP application consisting of several plugins that need to communicate. For communication I want to use the event service provided by org.eclipse.e4.core.services.events.IEventBroker so my plugins stay loosely coupled. I use dependency injection to inject the event broker to a class that dispatches events: @Inject static IEventBroker broker; private void sendEvent() { broker.post(MyEventConstants.SOME_EVENT, payload) } On the receiver side, I have a method like: @Inject @Optional private void receiveEvent(@UIEventTopic(MyEventConstants.SOME_EVENT) Object payload) Now the questions: In order for IEventBroker to be successfully injected, my class needs access to the current IEclipseContext. Most of my classes using the event service are not referenced by the e4 application model, so I have to manually inject the context on instantiation using e.g. ContextInjectionFactory.inject(myEventSendingObject, context); This approach works but I find myself passing around a lot of context to wherever I use the event service. Is this really the correct approach to event based communication across an E4 application? how can I easily write JUnit tests for a class that uses the event service (either as a sender or receiver)? Obviously, none of the above annotations work in isolation since there is no context available. I understand everyone’s convinced that dependency injection simplifies testability. But does this also apply to injecting services like the IEventBroker? This article describes creation of your own IEclipseContext to include the process of DI in tests. Not sure if this could resolve my 2nd issue but I also hesitate running all my tests as JUnit Plug-in tests as it appears impractible to fire up the PDE for each unit test. Maybe I just misunderstand the approach. This article speaks about “simply mocking IEventBroker”. Yes, that would be great! Unfortunately, I couldn’t find any information on how this can be achieved. All this makes me wonder whether I am still on a "good path" or if this is already a case of bad design? And if so, how would you go about redesigning? Move all event related actions to dedicated event sender/receiver classes or a dedicated plugin?

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• How to calculate next Friday at 3am?

  - by Mark

  How can you calculate the following Friday at 3am as a datetime object? Clarification: i.e., the calculated date should always be greater than 7 days away, and less than or equal to 14. Going with a slightly modified version of Mark's solution: def next_weekday(dt=datetime.datetime.now(), time_of_day=datetime.time(hour=3), day_of_week=4): dt += datetime.timedelta(days=7) if dt.time() < time_of_day: dt = dt.combine(dt.date(), time_of_day) else: dt = dt.combine(dt.date(), time_of_day) + datetime.timedelta(days=1) return dt + datetime.timedelta((day_of_week - dt.weekday()) % 7)

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• tap interfaces always disabled in linux bridge

  - by Dani Camps

  I have a physical interface eth0, and I want to create two virtual interfaces and bridge them with eth0. For this purpose I do: #Create the virtual interfaces tunctl -t tap0 tunctl -t tap1 ifconfig tap0 up ifconfig tap1 up #Create the bridge brctl addbr br0 brctl stp br0 off brctl addif br0 eth0 brctl addif br0 tap0 brctl addif br0 tap1 #Turning up the bridge ifconfig br0 up However my problem if that the tap interfaces always appear disabled in the bridge, and no traffic flows to them. $brctl show br0 bridge name bridge id STP enabled interfaces br0 8000.080027cabeba no eth2 tap0 tap1 $brctl showstp br0 br0 bridge id 8000.080027cabeba designated root 8000.080027cabeba root port 0 path cost 0 max age 20.00 bridge max age 20.00 hello time 2.00 bridge hello time 2.00 forward delay 15.00 bridge forward delay 15.00 ageing time 300.01 hello timer 0.00 tcn timer 0.00 topology change timer 0.00 gc timer 298.42 flags eth2 (1) port id 8001 state forwarding designated root 8000.080027cabeba path cost 4 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8001 forward delay timer 12.97 designated cost 0 hold timer 1.24 flags tap0 (2) port id 8002 state disabled designated root 8000.080027cabeba path cost 100 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8002 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags tap1 (3) port id 8003 state disabled designated root 8000.080027cabeba path cost 100 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8003 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags Is there any way to set the tap interfaces in forwarding state? I do not understand why they are not because STP is disabled. Cheers Daniel

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• How do you embed XHTML into APT file when using Maven to generate a site?

  - by Clinton

  I am using maven to generate a website for a Java project, which uses APT "Almost Plain Text" as a wiki like markup. Maven takes this and turns it into XHTML. I already have a custom template/skin that I am using for the site, but the index page will have a couple of extra custom design elements that are beyond the capabilities of APT. So how can you add xhtml to the apt file so that it gets correctly embedded in the final output? Thanks.

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• Performance associated with storing millions of files on NTFS

  - by Tim Brigham

  Does anyone have a method / formula, etc that I could use - hopefully based on both current and projected numbers of files - to project the 'right' length of the split and the number of nested folders? Please note that although similar it isn't quite the same as Storing a million images in the filesystem. I'm looking for a way to help make the theories outlined more generic. Assumptions I have 'some' initial number of files. This number would be arbitrary but large. Say 500k to 10m+. I have considered the underlying physical hardware disk IO requirements that would be necessary to support such an endeavor. Put another way As time progresses this store will grow. I want to have the best balance of current performance and as my needs increase. Say I double or triple my storage. I need to be able to address both current needs and projected future growth. I need to both plan ahead and not sacrifice too much of current performance. What I've come up with I'm already thinking about using a hash split every so many characters to split things out across multiple directories and keeping the trees even, very similar as outlined in the comments in the question above. It also avoids duplicate files, which would be critical over time. I'm sure that the initial folder structure would be different based on what I've outlined, and depending on the initial scale. As far as I can figure there isn't a one size fits all solution here. It would be horrendously time intensive to work something out experimentally.

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• Rails upload to s3 performance issue

  - by Denis

  Hello, I'm building an app to store files on my s3 account. I use Rails 3.0.0beta A lot of files can be uploaded at the same time, and the cost (from a performance point of view) of an upload is quite heavy, my app will be busy handling uploads all the time! Maybe a solution is to upload directly to s3, but I still need a submit to my app, at least to store the file's name. I'm wondering what is the best solution?

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• login control not workin after some times in asp.net

  - by manish sharma

  hello i am manish my problem is i have created a website with login control in ASP.net it works properly first few time after some time it generates an error "your login attemt was not successfully plaese try again" this type of message i got when i tried to login after some times. can anyone solve this problem. i am using sqlserver2008.

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• android :displaying multiple activities on same screen

  - by Puneet kaur

  hi, is it possible to show two activies on same screen at a time. and each activity is showing data which changes with time .. Thanks

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• How to diagnose website performance/app pool recycling with Windows 2008/IIS7

  - by ilasno

  Ok, so there are various symptoms here (clients and and our own employees complaining of intermittent slowdowns, getting 'kicked out' to login page or just having a save request not properly save the submitted data). The environment: Windows Server 2008 (Datacenter), Service Pack 2, 64-bit, 2x2.8 GHz processors, 7.5 GB RAM MS SQL Server 2008 (running on the same machine) IIS 7 There are ~10 websites running on the server, each in their own application pool - most of these pools are running in Integrated mode, 2 are in Classic, all are on .NET 2.0 and all run as ApplicationPoolIdentity. I'm trying to analyze, diagnose, and troubleshoot and am struggling with where to get more info about what could be happening. Here are some steps i have already taken: Set each application pool to recycle once per day, and removed any other automatic recycling Set a Virtual Memory Limit for each to 1024000KB (1GB) Enabled ALL 'Generate Recycle Event Log Entry' entries (Config Changes, Isapi Reported Unhealthy, Manual Recycle, Private Memory Limit Exceeded, Regular Time Interval, Request Limit Exceeded, Specific Time, Virtual Memory Limit Exceeded) I have seen the app pool processes recycle (in Task Manager) - a new one will start up, and then the first one dies off - and this has happened without the memory or time going over the settings. This is a fairly new server, and most of these came from Windows Server 2003/IIS6. Any 'next steps' for setting up information gathering, logging, diagnosing, etc. would be much appreciated! j

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• Run length encoding

  - by Phoenix

  What is the best we can do with run length encoding. http://en.wikipedia.org/wiki/Run-length_encoding Page suggests the time complexity is O(m*n) where m is the number of time the number repeats .. Is the a more efficient algorithm to do RLE ??

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• Should BASIC continue to be recommended for non-programmers and beginners?

  - by Casey

  I just came across a new BASIC implementation for Google Android application called Simple. You can read about it here: http://google-opensource.blogspot.com/2009/07/programming-made-simple.html Clearly, a lot of time and effort has been recently put into enabling this functionality for Android. Should the software industry continue to encourage non-programmers into learning BASIC, or are modern languages like C#, Python, Ruby more appropriate at this time?

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• Unit Testing: DateTime.Now

  - by Pedro

  I have some unit tests that expects the 'current time' to be different than DateTime.Now and I don't want to change the computer's time, obviously. What's the best strategy to achieve this? Thanks

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• WPF/MVVM: Delegating a domain Model collection to a ViewModel

  - by msfanboy

  A domain model collection (normally a List or IEnumerable) is delegated to a ViewModel. Thats means my CustomerViewModel has a order collection of type List or IEnumerable. No change in the list is recognized by the bound control. But with ObservableCollection it is. This is a problem in the MVVM design pattern. How do you cope with it?

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