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• Ant: project dependencies in a flat project layout with ivy

  - by MH

  Hello, I have two (Eclipse-) projects. Project A depends on project B, but the projects aren't nested i.e. project A is not a subproject of project B. Apache Ivy is responsible for the dependency management. When I run the compile task in Project A, is there any way to trigger the compile task (in project B) automatically (for example if the jar file of project B doesn't exist)? Thanks a million in advance.

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• Database schema for multiple category/product relationship

  - by sree01

  I want to design a database for an e-commerce application with category/subcategory management. Please suggest a database schema where we can create categories and subcategories and add products to those categories. Each product can have multiple categories and we can select products belong to multiple categories using a boolean database query Thanks

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• Beginning with SQL

  - by Natasha

  Hey ALL; I am enthusiastic to enter the world of Databases through SQL , but i don't know if there's pre-requisits of any significance , i only know c# and java . Besides what tools do i need? i have visual studio 2008 and sql server management studio what else do i need? is it necessary to download a server OS? Bare with me i'm just a beginner lol Thanks all Natasha

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• Shut down windows service based on load

  - by JP

  Hello, I was wondering if there are any free / open source solutions that will start and stop a windows service based on load? I have some pubsub subscriber services that do background work which is not critical. Ideally i would like tot be able to automate things so that these services could start if memory/cpu/disk i/o was under a certain threshold and stop gracefully if that threshold was met. Do you know of any solutions? Thanks JP

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• How to enable attachment using Apache File upload

  - by Stardust

  I am using Apache commons File upload API to Store the file from JSP to servlets in temp directory, but I don't know what should I do next to send the email as an attachment using javamail API. How can I retrieve those files which is written in temp directory using Apache Fileupload API to send them as attachment to mail Server. How will writing those files either to memory or disk will help me?

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• Reading Resource Files from my own APK in Android Native Environment

  - by Kyle

  I'm porting to Android. My existing project has a ton of resource files that I'm porting into my Android project. I have them all in /res/raw/, and I would like to access those resources in my native library with functions such as fopen() and such. Can this be done, or do I have to go through JNI for this as well? I would really prefer not to, for ease of porting and possible speed and memory reasons.

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• Easier way to start debugging a windows service in C#

  - by Matthias

  Is there a way to easier start stepping through code except to start the service through the Windows Service Controll Management and then attach the debugger to the thread? It's kind of cumbersome and I'm wondering if there is not a more straight-forward approach.

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• An affordable way to use multiple Delayed::Job queues

  - by NudeCanalTroll

  I have a Ruby on Rails app that needs process many background jobs simultaneously: anywhere from 5-6 at a time to up to 50-60 at a time depending on the time of day. Right now my app is running on Heroku, which charges $.05/hour per worker, regardless of how much CPU or memory the worker is using. This is costing me a boatload each month... up to $1200/mo. Are there any hosts that will allow me to do what I'm doing for significantly cheaper?

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• Event sourcing: Write event before or after updating the model

  - by Magnus

  I'm reasoning about event sourcing and often I arrive at a chicken and egg problem. Would be grateful for some hints on how to reason around this. If I execute all I/O-bound processing async (ie writing to the event log) then how do I handle, or sometimes even detect, failures? I'm using Akka Actors so processing is sequential for each event/message. I do not have any database at this time, instead I would persist all the events in an event log and then keep an aggregated state of all the events in a model stored in memory. Queries are all against this model, you can consider it to be a cache. Example Creating a new user: Validate that the user does not exist in model Persist event to journal Update model (in memory) If step 3 breaks I still have persisted my event so I can replay it at a later date. If step 2 breaks I can handle that as well gracefully. This is fine, but since step 2 is I/O-bound I figured that I should do I/O in a separate actor to free up the first actor for queries: Updating a user while allowing queries (A0 = Front end/GUI actor, A1 = Processor Actor, A2 = IO-actor, E = event bus). (A0-E-A1) Event is published to update user 'U1'. Validate that the user 'U1' exists in model (A1-A2) Persist event to journal (separate actor) (A0-E-A1-A0) Query for user 'U1' profile (A2-A1) Event is now persisted continue to update model (A0-E-A1-A0) Query for user 'U1' profile (now returns fresh data) This is appealing since queries can be processed while I/O-is churning along at it's own pace. But now I can cause myself all kinds of problems where I could have two incompatible commands (delete and then update) be persisted to the event log and crash on me when replayed up at a later date, since I do the validation before persisting the event and then update the model. My aim is to have a simple reasoning around my model (since Actor processes messages sequentially single threaded) but not be waiting for I/O-bound updates when Querying. I get the feeling I'm modeling a database which in itself is might be a problem. If things are unclear please write a comment.

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• atomic operation cost

  - by osgx

  Hello What is the cost of the atomic operation? How much cycles does it consume? Will it pause other processors on SMP or NUMA, or will it block memory accesses? Will it flush reorder buffer in out-of-order CPU? What effects will be on the cache? Thanks.

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• SharePoint Search Service is not working

  - by George2

  Hello everyone, I am using SharePoint Server 2007 with collaboration portal template on Windows Server 2008. When I use the following function from Central Administration from Application Management - search - Manage Search Service, I met with the following error message, any ideas what is wrong? The search service is currently offline. Visit the Services on Server page in SharePoint Central Administration to verify whether the service is enabled. This might also be because an indexer move is in progress. thanks in advance, George

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• Reusing controllers in different web sites with asp.net mvc

  - by Alfredo Fernández

  Hello, I'm creating a content management for a kind of Enterprises, lets say for example, pets shops. Thats my projects structure: PetShopModel PetShopControllers PetShopWeb1 PetShopWeb2 PetShopWeb3 The structure is that since each client would have different specifications. Its that a good choice? or there are better solutions? Thanks in advance and sorry about my english!

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• spymemcached (Java Memcached Client)

  - by Java Guy

  Is there a way to collect the memcached stats using this API (spymemcached)? I know there are tools like cacti to collect information on Memcached Server. But I would like to collect, say, memory usage by each item I have put into the server--the total no. of items in the same category, etc... more importantly, the bytes used by individual pieces.

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• iPhone SDK: How to record voices with ambient noise supression?

  - by Harkonian

  Can anyone point me in the right direction on how I would minimize ambient noise while recording someone speaking using the iPhone SDK Core Audio? I'm guessing a band-pass filter that eliminates any frequencies above and below the human vocal range might work. I have no idea how I would implement band filters on audio in the SDK though. The optimum solution would be one that eliminates the noise from the stream before it is written to memory/disk. Some sample code would be appreciated.

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• Why does a JRuby application on App Engine take so long to start?

  - by Major Tom

  I'm considering using JRuby on App Engine but have heard that Juby app on App Engine have a long startup lag. Why is this? Is it because the JRuby jar files are so large that a cold startup requires them to be loaded into memory before the app can start serving? That would be my guess but I'm not sure if that's a precise technical explanation.

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• Which DB? Linq to SQL classes

  - by gadirzade

  Hi. I wont to devolope multiple user supported accounting management aplication in c#.I wont to use linq to sql clases.LINQ to SQL only supports SQL Server/Compact however it is possible the SQLite people have written their own LINQ provider given the name of the assembly.I have to use Db that is FREE.Which DBMS do you prefer to me?

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• "A potentially dangerous Request.Form value was detected from the client" error using TINY MCE for

  - by Manoj Wadhwani

  When I put value in textbox then its throught this error. I am making Content Management System. A potentially dangerous Request.Form value was detected from the client (elm1="<p>ABC</p>"). when page go to server then it's through error. Please assist.

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• Faster integer division when denominator is known?

  - by aaa

  hi I am working on GPU device which has very high division integer latency, several hundred cycles. I am looking to optimize divisions. All divisions by denominator which is in a set { 1,3,6,10 }, however numerator is a runtime positive value, roughly 32000 or less. due to memory constraints, lookup table is not option. Can you think of alternatives? I have thought of computing float point inverses, and using those to multiply numerator. Thanks

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• deleting an object

  - by Nima

  Hi, First, when you want to free the memory assigned to an object in C++, which one is preferred? Explicitly calling deconstructor or using delete? Object* object = new Object(...); ... delete object; OR object->~Object(); Second, does the delete operator call the deconstructor implicitly? Thanks,

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• Are there any drawbacks to using helper :all in Rails

  - by Rob Jones

  In Rails 'helper :all' makes all your helpers 'available' to all your controllers. This is concise and convenient, but does it have any memory and/or performance implications compared to explicitly calling the helpers that each controller actually needs? It's unclear form the docs whether using it involves 'require'ing all those files, or whether autoload is being used. I can't tell from the source in the Rails framework docs. thanks

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• Any difference in performance/compatibility of different languages in PostgreSQL?

  - by Igor

  In nowadays the PostgreSQL offers plenty of procedural languages: pl/pgsql, pl/perl, etc Are there any difference in the speed/memory consumption in procedures written in different languages? Does anybody have done any test? Is it true that to use the native pl/pgsql is the most correct choice? How the procedure written in C++ and compiled into loadable module differs in all parameter w.r.t. the user function written with pl/* languages?

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• Is using the Class instance as a Map key a best practice?

  - by Pangea

  I have read somewhere that using the class instances as below is not a good idea as they might cause memory leaks. Can someone tell me if if that is a valid statement? Or are they any problems using it this way? Map<Class<?>,String> classToInstance=new HashMap(); classToInstanceMap.put(String.class,"Test obj");

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• choosing the right RAID level

  - by student

  Recently, we bought a "HP-DL380 G6 Server" with 6 146GB (SCSI)HDD for our colleague course management application and website with 10000 daily visitors. we want to choose the best RAID level. how can we choose the right RAID level ? what is the best RAID level for our application ?

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• Query Results Differ In SQL Mgmt and CFQuery

  - by E-Madd

  executing the following query in SQL management studio provides results, whereas it does not via cfquery... select distinct locationid, locationname, locationaliasname from vwLocationsWithAlias where 1 = 0 or (LocationName = N'the' or LocationAliasName = N'the') or (LocationName = N'the republic' or LocationAliasName = N'the republic') The results expected are returned from SQL Mgmt Studio, but nothing is returned from CFQuery. WTF!?

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• Rmagick on BitNami not working

  - by Steven

  I am running a rails app on BitNami rubystack, and try to upload picture using file_column i get this error, check below: LoadError (998: Invalid access to memory location. - C:/Program Files (x86)/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/rmagick-2.9.0-x86-mswin32/ ext/RMagick2.so): C:/Program Files (x86)/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/rmagick-2.9.0-x86-mswin32/ext/RMagick2.so C:/Program Files (x86)/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:156:in require' C:/Program Files (x86)/BitNami RubyStack/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.2/lib/active_support/dependencies.rb:521:innew_constants_in

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