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• Parsing Json Feeds with google Gson

  - by mnml

  I would like to know how to parse a json feed by items, eg. url / title / description for each item. I have had a look to the doc / api but, it didn't help me. This is what I got so far import com.google.gson.Gson; import com.google.gson.JsonObject; public class ImportSources extends Job { public void doJob() throws IOException { String json = stringOfUrl("http://feed.test/all.json"); JsonObject jobj = new Gson().fromJson(json, JsonObject.class); Logger.info(jobj.get("responseData").toString()); } public static String stringOfUrl(String addr) throws IOException { ByteArrayOutputStream output = new ByteArrayOutputStream(); URL url = new URL(addr); IOUtils.copy(url.openStream(), output); return output.toString(); } }

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• How to avoid using duplicate savepoint names in nested transactions in nested stored procs?

  - by Gary McGill

  I have a pattern that I almost always follow, where if I need to wrap up an operation in a transaction, I do this: BEGIN TRANSACTION SAVE TRANSACTION TX -- Stuff IF @error <> 0 ROLLBACK TRANSACTION TX COMMIT TRANSACTION That's served me well enough in the past, but after years of using this pattern (and copy-pasting the above code), I've suddenly discovered a flaw which comes as a complete shock. Quite often, I'll have a stored procedure calling other stored procedures, all of which use this same pattern. What I've discovered (to my cost) is that because I'm using the same savepoint name everywhere, I can get into a situation where my outer transaction is partially committed - precisely the opposite of the atomicity that I'm trying to achieve. I've put together an example that exhibits the problem. This is a single batch (no nested stored procs), and so it looks a little odd in that you probably wouldn't use the same savepoint name twice in the same batch, but my real-world scenario would be too confusing to post. CREATE TABLE Test (test INTEGER NOT NULL) BEGIN TRAN SAVE TRAN TX BEGIN TRAN SAVE TRAN TX INSERT INTO Test(test) VALUES (1) COMMIT TRAN TX BEGIN TRAN SAVE TRAN TX INSERT INTO Test(test) VALUES (2) COMMIT TRAN TX DELETE FROM Test ROLLBACK TRAN TX COMMIT TRAN TX SELECT * FROM Test DROP TABLE Test When I execute this, it lists one record, with value "1". In other words, even though I rolled back my outer transaction, a record was added to the table. What's happening is that the ROLLBACK TRANSACTION TX at the outer level is rolling back as far as the last SAVE TRANSACTION TX at the inner level. Now that I write this all out, I can see the logic behind it: the server is looking back through the log file, treating it as a linear stream of transactions; it doesn't understand the nesting/hierarchy implied by either the nesting of the transactions (or, in my real-world scenario, by the calls to other stored procedures). So, clearly, I need to start using unique savepoint names instead of blindly using "TX" everywhere. But - and this is where I finally get to the point - is there a way to do this in a copy-pastable way so that I can still use the same code everywhere? Can I auto-generate the savepoint name on the fly somehow? Is there a convention or best-practice for doing this sort of thing? It's not exactly hard to come up with a unique name every time you start a transaction (could base it off the SP name, or somesuch), but I do worry that eventually there would be a conflict - and you wouldn't know about it because rather than causing an error it just silently destroys your data... :-(

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• Using SqlBulkCopy in a multithread scenario with ThreadPool issue

  - by Ruben F.

  Hi. I'm facing a dilemma (!). In a first scenario, i implemented a solution that replicates data from one data base to another using SQLBulkCopy synchronously and i had no problem at all. Now, using ThreadPool, i implemented the same in a assynchronously scenario, a thread per table, and all works fine, but past some time (usualy 1hour because the operations of copy takes about the same time), the operations sended to the ThreadPool stop being executed. There are one diferent SQLBulkCopy using one diferent SQLConnection per thread. I already see the number of free threads, and they are all free at the begining of the invocation...I have one AutoResetEvent to wait that the threads finish their job before launching again, and a Semaphore FIFO that hold the counter of active threads. There are some issue that I have forgotten or that I should avaliate when using SqlBulkCopy? I apreciate some help, because my ideas are over;) Thanks

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• Pdssql.dll cannot be found

  - by Kolten

  I am attempting to open a Crystal Reports 8.5 document, and when I try to set the database to the Production data server, i get the error "Pdssql.dll cannot be found". Googling, this is a common problem, but none of the fixes I tried seem to work. This is a new computer. I do have SQL Server 2008 client tools installed, but I believe previously I had Sql Server 2005 client tools. I attempted to install the SQL Server 2005 client tools, but that didn't go through due to me having 2008 installed. I require 2008 to do my job now. Everything I search for says this is a 16bit driver, and I need to install the 2005 client tools. Unfortunately this cannot be done due to me having 2008. is there some sort of work-around I can do? Thanks

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• Is there a format or service for resume/CV data?

  - by Ben Dauphinee

  I have noticed through the process of signing up for various freelance and job seeking or professional network sites that they all want your resume/CV data. And I am really getting tired of copy/pasting this data, especially since I have a website. Is there a standard format or service somewhere that I do not know about for this data? If not, does anyone want to help me build something like this out? I'm thinking a service similar to OpenID that allows you to maintain a central resume to have your data pulled from. No more filling in the same data over and over, and having to maintain the copies on any of the plethora of websites that have that data. Takers?

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• Tricks to avoid losing motivation?

  - by AareP

  Motivation is a tricky thing to upkeep. Once I thought that ambitious projects will keep programmer motivated, and too simple tasks will hinder his motivation. Now I have plenty of experience with small and large projects, desktop/web/database programming, c++/c#/java/php languages, oop/non-oop paradigms, day-job/free-time programming.. but I still can't answer the question of motivation. Which programming tasks I like, and which don't? It seems to depend on too many variables. One thing remains constant though. It's that starting everything from scratch is always more motivating than extending some existing system. Unfortunately it's hard to use this trick in productive programming. :) So my question is, what tricks programmer can use to stay motivated? For example should we use pen and paper as much as possible, in order not to get fed up with monitor and keyboard?

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• Background processing in rails

  - by hashpipe

  Hi, This might seem like a FAQ on stackoverflow, but my requirements are a little different. While I have previously used BackgroundRB and DJ for running background processes in ruby, my requirement this time is to run some heavy analytics and mathematical computations on a huge set of data, and I need to do this only about the first 15 days of the month. Going by this, I am tempted to use cron and run a ruby script to accomplish this goal. What I would like to know / understand is: 1 - Is using cron a good idea (cause I'm not a system admin, and so while I have basic idea of cron, I'm not overly confident of doing it perfectly) 2 - Can we somehow modify DJ to run only on the first 15 days of the month (with / without using cron), and then just stop and exit once all the jobs in the queue for the day are over (don't want it to ping the DB every time for a new job...whatever the jobs will be in the queue when DJ starts, that will be all). I'm not sure if I have put the question in the right manner, but any help in this direction will be much appreciated. Thanks

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• Storing hierarchical (parent/child) data in Python/Django: MPTT alternative?

  - by Parand

  I'm looking for a good way to store and use hierarchical (parent/child) data in Django. I've been using django-mptt, but it seems entirely incompatible with my brain - I end up with non-obvious bugs in non-obvious places, mostly when moving things around in the tree: I end up with inconsistent state, where a node and its parent will disagree on their relationship. My needs are simple: Given a node: find its root find its ancestors find its descendants With a tree: easily move nodes (ie. change parent) My trees will be smallish (at most 10k nodes over 20 levels, generally much much smaller, say 10 nodes with 1 or 2 levels). I have to think there has to be an easier way to do trees in python/django. Are there other approaches that do a better job of maintaining consistency?

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• WinForms prints to default printer even if it's not available/connected

  - by Valentein

  How can I determine if printer is connected? Typically this application prints to the default printer but in some cases that printer may not be available. If so I don't want the job sent to it's queue but rather printed to another available printer. I understand the PinterSettings.InstalledPrinters property. Does PrintDocument.PrinterSettings.IsValid return false if a printer is not available? Does WPF provide this kind of functionality? My problem is different than Printing problem in C# windows app - Always prints to default printer

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• What technical skills needed for algorithmic trading, HFT, etc?

  - by alchemical

  I'm interested in getting into developing trading systems, black box, HFT, etc. My primary experience is with C# and .Net (7 years). I've also done some sockets programming. I have some experience in finance working on analysis applications (2 years). My goal is to move into developing automated trading systems for a hedge fund, bank, etc. Is there any way to learn the skills needed for this without somehow getting the job first? I've looked at the open source tradelink, IB interactive brokerage, etc. I'm playing around with this framework, and may hook it up and do some paper trading. However, I'm not sure if this has much relationship with how a well-funded entity would be conducting a high-level automated trading operation. I.e. would the tools and frameworks they prefer be a totally different skill-set? Also wondering if I need to learn C++ and/or Java for these types of apps.

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• Determine the ContentObserver

  - by tommieb75

  I have this content observer that is watching on the Call Log: public class monitorCallLog extends ContentObserver{ private static final String TAG = "monitorCallLog"; public monitorCallLog(Handler handler) { super(handler); // TODO Auto-generated constructor stub } @Override public boolean deliverSelfNotifications() { return false; } @Override public void onChange(boolean selfChange){ Log.v(TAG, "[onChange] *** ENTER ***"); super.onChange(selfChange); // Code goes in here to handle the job of tracking.... Log.v(TAG, "[onChange] *** LEAVE ***"); } } Now... how can I determine the nature of the change on this URI content://call_log/calls? I want to check on it if a deletion has occurred on the said URI... but there is no way of knowing...this seems to apply on a query/delete/insert/update on said URI that triggers the onChange method.... any tips/suggestions?

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• Best practices for fixed-width processing in .NET

  - by jmgant

  I'm working a .NET web service that will be processing a text file with a relatively long, multilevel record format. Each record in the file represents a different entity; the record contains multiple sub-types. (The same record format is currently being processed by a COBOL job, if that gives you a better picture of what we're looking at). I've created a class structure (a DATA DIVISION if you will) to hold the input data. My question is, what best practices have you found for processing large, complex fixed-width files in .NET? My general approach will be to read the entire line into a string and then parse the data from the string into the classes I've created. But I'm not sure whether I'll get better results working with the characters in the string as an array, or with the string itself. I guess that's the specific question, string vs. char[], but I would appreciate any other pointers anyone has. Thanks.

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• accessing $_SESSION when using file_get_contents in PHP

  - by hairdresser-101

  I am basic - intermediate developer using php and am a little stumped as to what I have found. I need some help in understanding how to alleviate this issue: I have a page called send.email.php which sends an email - pretty simple stuff - I pass an order id, it creates job request and sends it out. This works fine when used in the context I developed it (Use javascript to make an AJAX call to the URL and pass the order_id as a query parameter) I am now trying to reuse the exact same page in another application however I am calling it using php file_get_contents($base_url.'admin/send.email.php?order_id='.$order_id). When I call the page this way, the $_SESSION array is empty isempty() = 1. Is this because I am initiating a new session using file_get_contents and the values I stored in the $_SESSION on login are not available to me within there? Any help? Thanks

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• Hudson leaving open sessions

  - by James Carr

  Does anyone have any experiences with Hudson leaving sessions open to a Subversion server? We've been increasing our job list and got ~50 which poll the SCM regularly. It's been working fine but recently our SCM has started acting up by refusing handshakes, which we suspect is down to the sessions left open by Hudson. Last count there were ~400 sessions with nothing building on Hudson. At the moment the only solution we've found is restarting the Subversion service but this is becoming increasingly frequent and not a long term solution. Any experiences/ideas would be appreciated.

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• How to aggregate over few types with linq?

  - by Shimmy

  Can someone help me translate the following to one liner: Dim items As New List(Of Object) For Each c In ph.Contacts items.Add(New With {.Type = "Contact", .Id = c.ContactId, .Title = c.Title}) Next For Each c In ph.Persons items.Add(New With {.Type = "Person", .Id = c.PersonId, .Title = c.Title}) Next For Each c In ph.Jobs items.Add(New With {.Type = "Job", .Id = c.JobId, .Title = c.Title}) Next Is it possible to merge them all into one query or method line, I don't really care if this will be done with something other than linq, I am just looking for a more efficient way as I have a long list coming ahead, and the aggregating list will be strongly-typed using Dim list = blah blah

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• Localize DisplayNameAttributes in ActionFilter?

  - by boris callens

  Is it possible to access the DisplayNameAttributes that are used on my ViewData.Model so I can Localize them before sending them to the view? Something like this: Public Void OnActionExecuted(ActionExecutedContext: filterContext) { foreach (DisplayNameAttribute attr in filterContext...) { attr.TheValue = AppMessages.GetLocazation(attr.TheValue); } } What I'm missing is how to access the attributes. Is this possible at all? P.S: We're using vb.net at my job and it's infiltrating my brain. So apologies if my C# is a tad off.

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• Effective file permissions tool's api in windows

  - by apoorv020

  Starting from Windows Server 2003, Windows included a new tool which calculates the effective permissions for a user (basically it resolves all groups access and takes care of all "deny" permissions as well). An example in point is that a user A belongs to groups B and C. B has been denied read permissions on a file F, while C has been allowed read and write permissions on the file and I want to calculate the effective permissions user A has on file F. This tool is available on Windows Server 2003,Vista,7 and Server 2008 by right clicking on a file and going to properties - security - advanced - effective permissions. What I need is an API in C# which does the same job. The most common FILE API returns access rules (class FileAccessRules), but there seems to be no direct way to calculate effective permissions from these set of access rules. Note: I do not want to process effective permissions in the code if at all possible, but am ready to do so as a last resort.

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• Use bug tracker to get things done and manage personal tasks?

  - by Frank

  This is slightly off-topic, but can only be answered by programmers and is useful to many programmers: Do you think it is useful to use a bug tracking system to keep track of personal todo items and to Get Things Done? I have not tried that; in fact, I don't have much experience with bug tracking systems. For my todo lists, I have played around with Google Tasks and Remember The Milk, but both of them have shortcomings: Google Tasks: I like that you can create todo lists easily, can reorder items in the list and easily create hierarchies. But it is way too simplistic and does not allow to tag tasks or move tasks from one list to another. Remember The Milk: It is nice and sleek, but you cannot create hierarchies of tasks, cannot arbitrarily reorder tasks and cannot set dependencies of tasks. That's where a bug tracking system should come in: Since I think (maybe too much?) like a programmer, my tasks have a natural hierarchy and a tree of dependencies, like in a Makefile. Here are two examples: The task of writing my thesis is done when several milestones are done. Some of these milestones can run in parallel (writing background chapter, running experiments A, running experiments B), others depend on each other (writing main chapter depends on first getting results from experiments A). The same is true for more personal goals: I want to host a dinner party, which requires finding a good date, finishing the guest list, making invitations, finding nice recipes, cooking, ... For me, all these tasks involve hierarchical dependencies and milestones that bug tracking systems should be able to handle? Here is an article that explains how to do advanced GTD with Remember The Milk, but he has to use several workarounds: (1) add a general tag 'wait' to tasks that are waiting for others to be completed but you cannot enter the IDs of the tasks that they are waiting for, (2) starting some special tasks with "." so that they are at the top of the alphabetically sorted list and signal that others are 'below' it as subgoals. Bug tracking systems should be able to handle these things much more naturally? Does anyone have experience and can recommend a lightweight bug tracking system that might be good for this? Other requirements: Should run as web app, should allow me to tag a task with several tags (like 'work', 'fun', 'short-task', 'errands', ...).

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• Fastest way to calculate an X-bit bitmask?

  - by Virtlink

  I have been trying to solve this problem for a while, but couldn't with just integer arithmetic and bitwise operators. However, I think its possible and it should be fairly easy. What am I missing? The problem: to get an integer value of arbitrary length (this is not relevant to the problem) with it's X least significant bits sets to 1 and the rest to 0. For example, given the number 31, I need to get an integer value which equals 0x7FFFFFFF (31 least significant bits are 1 and the rest zeros). Of course, using a loop OR-ing a shifted 1 to an integer X times will do the job. But that's not the solution I'm looking for. It should be more in the direction of (X << Y - 1), thus using no loops.

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• Using ptrace to generate a stack dump

  - by Gomez

  Hello. I am compiling C++ on *nix and I would like to generate a stack dump a) at an arbitrary point in the program, b) during any signal, particularly during SIGSEGV. Google tells me that ptrace is probably the tool for the job, but I can't find any comprehensible examples of walking the stack. Getting the return address, yeah, but what about the NEXT return address? And what about extracting the symbolic name of the function at that point? Something to do with DWARF? Many thanks if you can tell me where to go from here.

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• Is it possible to interop with Thunderbird using C#?

  - by Jurily

  Here's the latest hurdle in my ongoing quest to automate my job: All email in the company goes through 4 different email adresses, switching randomly back and forth (with a note attached in the global share: please set "keep email on server") All logic related to email is contained in a nice big Thunderbird profile, which gets copied back and forth to new machines; this includes sorting invoices into 5 different "folders", the list of VIP adresses to send notifications, and the VIP level of those customers I only need the contents of those folders (the attachments, anyway) The question: is there a way to ask Thunderbird for those attachments and lists from C#? Alternatively, can Outlook be set up to synchronize with Thunderbird? Where do I start reading? Ditching Thunderbird is not an option right now, I need to keep up with changes to the VIP list. P.S. I will set up a real email server right after Monkey saves me enough time to convince people about it.

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• An expression of non-boolean type specified in a context where a condition is expected, near 'END'.

  - by Mike Keller

  So maybe someone can point me in the right direction of what is causing this error? I've been fighting with this for a couple of hours and searching the web, and I can't figure out what I'm doing wrong here. It's included as part of a stored procedure, I don't know if that matters, if it does I can include that as well. Tables and field names have been changed to protect the innocent... meaning my job. Thanks. SELECT /* The fields are here*/ FROM /* my joins are here */ WHERE (Table.Field = stuff) AND (Table.Field2 = otherstuff) AND (Table2.Field3 = someotherstuff) AND CASE @param1 WHEN 0 THEN 'Table.Field IS NULL' WHEN 1 THEN 'Table.Field2 IS NOT NULL' ELSE '' END

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• How do I code a green button in UIActionSheet?

  - by Joshua

  I am using the code: { randomstatus=0; msg=[[NSString alloc]initWithFormat:@"Good job, do you want to continue?"]; UIActionSheet *actionSheet=[[UIActionSheet alloc]initWithTitle:msg delegate:self cancelButtonTitle:@"No" destructiveButtonTitle:@"Yes" otherButtonTitles:nil]; [actionSheet showInView:self.view]; [actionSheet release]; [msg release]; } I don't want to change the code, but I need the "destructiveButton" to be green instead of red. Is this possible, or do i need to use a different button?

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• Asynchronous Processing = Spanning Threads = Valid?

  - by jens

  Hello Experts, am I allowed (without any sideeffects) to create and start a new Thread() from within a doGet() Method of a servlet? Or does this somehow leak ressources? Is it valid to also pass the "Session" Object into the Thread to later save the result of my asynchronous processing (I will synchronized correctly) in the session? Or will this leak ressources when using the session "in indepedant threads"? = What would happen if the session meanwhile would be expired by the webcontainer as it has timedout and I will access it from my thread? Or would could this also lead to the sideffect, that storing the session in the thread will prevent the webcontainer from expiring the session at all (and therefore finally leak ressources as the sessions do not get cleared up)? (I know there are other Solutions, like working with DB-(Job)Records, JMS or Servlets 3.0) but I need so solve the problem as described by spanning a new Thread within doGet.) Thank you very much!! Jens

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• "Forked Java VM exited abnormally" error from junit tests

  - by Alb

  I have a java junit test that passes when run alone on a development machine. We also have a hudson job which runs all the tests, invoked via ant, on a Mac OS X 10.4 node with Java 1.5. The test was passing in the hudson build until recently but now (with no related code changes) one test fails everytime with the following error: Error Message Forked Java VM exited abnormally. Please note the time in the report does not reflect the time until the VM exit. Stacktrace junit.framework.AssertionFailedError: Forked Java VM exited abnormally. Please note the time in the report does not reflect the time until the VM exit. googling shows many others seem to have run into the same problem but there I couldn't find any answer.

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