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  • Does my TPL partitioner cause a deadlock?

    - by Scott Chamberlain
    I am starting to write my first parallel applications. This partitioner will enumerate over a IDataReader pulling chunkSize records at a time from the data-source. protected class DataSourcePartitioner<object[]> : System.Collections.Concurrent.Partitioner<object[]> { private readonly System.Data.IDataReader _Input; private readonly int _ChunkSize; public DataSourcePartitioner(System.Data.IDataReader input, int chunkSize = 10000) : base() { if (chunkSize < 1) throw new ArgumentOutOfRangeException("chunkSize"); _Input = input; _ChunkSize = chunkSize; } public override bool SupportsDynamicPartitions { get { return true; } } public override IList<IEnumerator<object[]>> GetPartitions(int partitionCount) { var dynamicPartitions = GetDynamicPartitions(); var partitions = new IEnumerator<object[]>[partitionCount]; for (int i = 0; i < partitionCount; i++) { partitions[i] = dynamicPartitions.GetEnumerator(); } return partitions; } public override IEnumerable<object[]> GetDynamicPartitions() { return new ListDynamicPartitions(_Input, _ChunkSize); } private class ListDynamicPartitions : IEnumerable<object[]> { private System.Data.IDataReader _Input; int _ChunkSize; private object _ChunkLock = new object(); public ListDynamicPartitions(System.Data.IDataReader input, int chunkSize) { _Input = input; _ChunkSize = chunkSize; } public IEnumerator<object[]> GetEnumerator() { while (true) { List<object[]> chunk = new List<object[]>(_ChunkSize); lock(_Input) { for (int i = 0; i < _ChunkSize; ++i) { if (!_Input.Read()) break; var values = new object[_Input.FieldCount]; _Input.GetValues(values); chunk.Add(values); } if (chunk.Count == 0) yield break; } var chunkEnumerator = chunk.GetEnumerator(); lock(_ChunkLock) //Will this cause a deadlock? { while (chunkEnumerator.MoveNext()) { yield return chunkEnumerator.Current; } } } } IEnumerator IEnumerable.GetEnumerator() { return ((IEnumerable<object[]>)this).GetEnumerator(); } } } I wanted IEnumerable object it passed back to be thread safe (the .Net example was so I am assuming PLINQ and TPL could need it) will the lock on _ChunkLock near the bottom help provide thread safety or will it cause a deadlock? From the documentation I could not tell if the lock would be released on the yeld return. Also if there is built in functionality to .net that will do what I am trying to do I would much rather use that. And if you find any other problems with the code I would appreciate it.

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  • EmptyDataTemplate and EmptyDataText not working

    - by Farinha
    I can't seem to get either EmptyDataTemplate or EmptyDataText of a GridView to work. I'm fetching the GridView contents in de codebehind and attaching them with using DataBind(). I've tried having them as null and as an empty List, and in both cases the text I put into EmptyDataTemplate or EmptyDataText is not displayed. What am I doing wrong?

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  • Which XML library for what purposes?

    - by John Mee
    A search for "python" and "xml" returns a variety of libraries for combining the two. This list probably faulty: xml.dom xml.etree xml.sax xml.parsers.expat PyXML beautifulsoup? HTMLParser htmllib sgmllib Be nice if someone can offer a quick summary of when to use which, and why.

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  • How can you represent a .NET DataType in a UML Diagram

    - by Blake Blackwell
    I am new to UML diagramming, but I'm trying to learn the ropes. Using a tool such as Visio or AgroUML how would you represent a .NET Datatype in your diagram? Two examples that I would like to do: DataTable List<MyObject> The only method I see right now is creating a class that represents a datatable. As far as representing collections, I can't find any method to do that. Thanks!

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  • L-Soft LISTSERV TCPGUI Interface for PHP Creation

    - by poolnoodl
    I'm trying to use LISTSERV's "API" in PHP. L-Soft calls this TCPGUI, and essentially, you can request data like over Telnet. To do this, I'm using PHP's TCP socket functions. I've seen this done in other languages but can't quite convert it to PHP. I can connect, I can change set ASCII or BINARY mode. But I can never quite craft the header packet the way I need to authenticate, so I'm thinking I'm messing up my conversion. C: http://www.lsoft.com/manuals/16.0/htmlhelp/advanced%20topics/TCPGUI.html#2334328 $origin = '[email protected]'; $pwd = 'password'; $host = "example.com"; $port = 2306; $email = "[email protected]"; $list = "mailinglist"; $command = "Query $list FOR $email"; $fp = stream_socket_client("tcp://$host:$port", $errno, $errstr, 30); $cmd = $command . " PW=" . $pwd; $len = strlen($cmd); $orglen = strlen($origin); $n = $len + $orglen + 1; $headerPacket[0] = "1"; $headerPacket[1] = "B"; $headerPacket[2] = "\r"; $headerPacket[3] = "\n"; $headerPacket[4] = ord($n / 256); $headerPacket[5] = ord($n + 255); $headerPacket[6] = ord($orglen); for ($i = 0; $i < $orglen; $i++) { $headerPacket[$i + 7] = ord($origin[$i]); } for ($i = 0; $i < $len; $i++) { $cmdPacket[$i] = ord($cmd[$i]); } fwrite($fp, implode($headerPacket)); while (!feof($fp)) { echo fgets($fp, 1024); } Any thoughts on where I'm going wrong? I'd much appreciate it if anyone could point me toward some code to do this, days of googling and searching here on SO has only lead me to examples in other languages. Of course, if you know C (or Java or Perl as linked below in my comment to bypass the spam filter), PHP, and socket programming fairly well, you could probably rewrite the whole of the code in an hour, maybe a few minutes. You'd have my eternal thanks for that.

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  • How to Not Submit a Form Using AJAXToolkit AutoComplete Extender?

    - by deepss
    Hi I have used AJAXToolkit AutoComplete extender in my project.It works fines.But the issue is with the form of the page. when i type in the AutoComplete, i get list of suggestions.When i click on the page other than the Autocomplete, the form gets submitted. any suggestions how to stop submission of entire form whenever i click on the page?I use .net 2.0

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  • i cant get the next page of friends using the twitter api

    - by vakas
    i am using the api twitterizer2 downloaded from http://code.google.com/p/twitterizer/downloads/list but when i try to get the friends of a user i get 100 friends but i cant get the next 100 friends thru NEXTpage function how to handle this...? Twitterizer.TwitterUserCollection userFollowing = Tw.TwitterUser.GetFriends(tokens,TwitterUrl); Twitterizer.TwitterUserCollection page2=userFollowing.NextPage when i get the next page it returns the same 100 users

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  • Android Emulator not loading on netbeans

    - by Drahcir
    I just downloaded the android sdk from the adnroid site and followed this tutorial to set it up on netbeans. Everything to seem to have installed fine but whenever i try to run the application this window pops up: What I am assuming it asking me to choose the emulator, but it is not showing up on the list. Is there a reason why?

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  • What is the total amount of public IPv4 addresses?

    - by Earlz
    Yes, I am needing to know what the total number possible IPs in the public IPv4 space. I'm not sure where to even get a neat list of all the IP address ranges, so could someone point me to a resource to calculate this myself or calculate the total number of IPs for me? Also, by Public IPs I mean not counting reserved or private-range IP addresses.. Only the ones that can be access through the internet.

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  • How to change src (ajax ref in options (events: 'href') when calling refetchEvents

    - by Martin Glynn
    My site is for listing theatrical productions (http://theaterOnline.com) I want to use a drop down list to enable users to filter the listings by location or genre. The following code refreshes the screen: $("#cfilter").change(function() { $('#calendar').fullCalendar('refetchEvents' ) }) but I need to be able to change SRC in the ajax call below: $.ajax({ url: src, dataType: 'json', data: params, cache: options.cacheParam || false, success: reportEventsAndPop}) which is a passed parameter from eventSources[1] TIA for anyone who can help!

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  • Whats the best way to send multiple variables in a query string within a URL

    - by Andy
    I have a client who is wanting to create a link which contains product codes so that his customers hit a page with just those products displayed in an attempt to increase conversion rates from affilliate sites. My question is whats the best way to send these multiple products in a single URL For example: http://www.mydomain.co.uk/bespoke-list.php?catNo=234-324-232-343 Obviously then the site would grab the codes from the string and display them... We're going to be using PHP! Thanks in advance.

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  • How do I use multiple arguments from an array to construct an execl() call in C?

    - by chucknelson
    I have a string array in C named args[] - now how can I use this list of arguments to construct a proper call to execl()? So if the array contains: {"/bin/ls","ls","-a","-l"} ...how can I eventually construct an execl() call that is: execl("/bin/ls","ls","-a","-l",NULL); I must be thinking about this wrong, as I can't find anything online, just talk about defining functions that can take a variable number of arguments.

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  • Can this django query be improved?

    - by Hobhouse
    Given a model structure like this: class Book(models.Model): user = models.ForeignKey(User) class Readingdate(models.Model): book = models.ForeignKey(Book) date = models.DateField() One book may have several readingdates. How do I list books having at least one readingdate within a specific year? I can do this: from_date = datetime.date(2010,1,1) to_date = datetime.date(2010,12,31) book_ids = Readingdate.objects\ .filter(date__range=(from_date,to_date))\ .values_list('book_id', flat=True) books_read_2010 = Book.objects.filter(id__in=book_ids) Is it possible to do this with one queryset, or is this the best way?

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  • Can I make this two LINQ queries into one query only?

    - by Holli
    From a List of builtAgents I need all items with OptimPriority == 1 and only 5 items with OptimPriority == 0. I do this with two seperate queries but I wonder if I could make this with only one query. IEnumerable<Agent> priorityAgents = from pri in builtAgents where pri.OptimPriority == 1 select pri; IEnumerable<Agent> otherAgents = (from oth in builtAgents where oth.OptimPriority == 0 select oth).Take(5);

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  • Postgresql count+sort performance

    - by invictus
    I have built a small inventory system using postgresql and psycopg2. Everything works great, except, when I want to create aggregated summaries/reports of the content, I get really bad performance due to count()'ing and sorting. The DB schema is as follows: CREATE TABLE hosts ( id SERIAL PRIMARY KEY, name VARCHAR(255) ); CREATE TABLE items ( id SERIAL PRIMARY KEY, description TEXT ); CREATE TABLE host_item ( id SERIAL PRIMARY KEY, host INTEGER REFERENCES hosts(id) ON DELETE CASCADE ON UPDATE CASCADE, item INTEGER REFERENCES items(id) ON DELETE CASCADE ON UPDATE CASCADE ); There are some other fields as well, but those are not relevant. I want to extract 2 different reports: - List of all hosts with the number of items per, ordered from highest to lowest count - List of all items with the number of hosts per, ordered from highest to lowest count I have used 2 queries for the purpose: Items with host count: SELECT i.id, i.description, COUNT(hi.id) AS count FROM items AS i LEFT JOIN host_item AS hi ON (i.id=hi.item) GROUP BY i.id ORDER BY count DESC LIMIT 10; Hosts with item count: SELECT h.id, h.name, COUNT(hi.id) AS count FROM hosts AS h LEFT JOIN host_item AS hi ON (h.id=hi.host) GROUP BY h.id ORDER BY count DESC LIMIT 10; Problem is: the queries runs for 5-6 seconds before returning any data. As this is a web based application, 6 seconds are just not acceptable. The database is heavily populated with approximately 50k hosts, 1000 items and 400 000 host/items relations, and will likely increase significantly when (or perhaps if) the application will be used. After playing around, I found that by removing the "ORDER BY count DESC" part, both queries would execute instantly without any delay whatsoever (less than 20ms to finish the queries). Is there any way I can optimize these queries so that I can get the result sorted without the delay? I was trying different indexes, but seeing as the count is computed it is possible to utilize an index for this. I have read that count()'ing in postgresql is slow, but its the sorting that are causing me problems... My current workaround is to run the queries above as an hourly job, putting the result into a new table with an index on the count column for quick lookup. I use Postgresql 9.2.

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  • What is the best credit card processing service?

    - by JerSchneid
    We're looking to add credit card payments to our system (and it needs to be fairly custom, handling variable "per use" charges each month). We would like the integration to be simple and secure (i.e. no storing of credit card data on our system). What, in your opinion, is the best credit card processing provider to offer this kind of security and flexibility. List only one provider per answer to let the voting system do it's thing.

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  • how to update only the updated rows in gridview?

    - by user603007
    what is the handiest way to update only the updated rows (only the checkbox column) in this gridview? what is a handy way to check wether the row was updated? c# public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { List<customer> listCustomer = new List<customer>(); customer cust1 = new customer(){name="fred",email="[email protected]",jobless="true"}; customer cust2 = new customer(){name="mark",email="[email protected]",jobless="false"}; listCustomer.Add(cust1); listCustomer.Add(cust2); GridView1.DataSource=listCustomer; GridView1.DataBind(); } } protected void btnUpdate_Click1(object sender, EventArgs e) { foreach (GridViewRow rw in GridView1.Rows) { CheckBox thiscontrol = (CheckBox)rw.Cells[0].FindControl("cb"); var ch = thiscontrol.Checked; //only update the updated rows? } } public class customer { public string name { get; set; } public string email { get; set; } public string jobless { get; set; } } html <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="gridviewUpdate._Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:GridView ID="GridView1" AutoGenerateColumns="false" runat="server"> <Columns> <asp:TemplateField> <ItemTemplate> <asp:CheckBox ID="jobless" runat="server" Checked='<%# Eval("jobless").ToString().Equals("true") %>' /> </ItemTemplate> </asp:TemplateField> <asp:BoundField DataField="email" /> <asp:BoundField DataField="name" /> </Columns> </asp:GridView> </div>

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  • Can Drupal terms in different Taxonomies be synonymous?

    - by DKinzer
    Let's say Taxonomy_A is associated to Node_Type_A Taxonomy_B is associated to Node_Type_B. AND Both Taxonomy_A and Taxonomy_B have a term called 'yellow'. Is it possible to make terms 'yellow' synonymous, so that if I'm looking at a list of 'yellow' stuff, I'm seeing content of both types (Node_Type_A, and Node_Type_B)?

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  • Entity Framework 4 missing features?

    - by Roger Alsing
    I'm well aware that similair topics have been brought up before e.g. http://stackoverflow.com/questions/1639043/entity-framework-4-vs-nhibernate But instead of arguments like: NHibernate have been around longer and is more mature EF4 is drag n drop and not enterprisy EF4 and LinqToSql are ... I would like to see a more detailed list of features that you consider missing from EF4. Personally, I think the lack of enum support is the biggest drawback of EF4.

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