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  • Publishing/subscribing multiple subsets of the same server collection

    - by matb33
    How does one go about publishing different subsets (or "views") of a single collection on the server as multiple collections on the client? Here is some pseudo-code to help illustrate my question: items collection on the server Assume that I have an items collection on the server with millions of records. Let's also assume that: 50 records have the enabled property set to true, and; 100 records have the processed property set to true. All others are set to false. items: { "_id": "uniqueid1", "title": "item #1", "enabled": false, "processed": false }, { "_id": "uniqueid2", "title": "item #2", "enabled": false, "processed": true }, ... { "_id": "uniqueid458734958", "title": "item #458734958", "enabled": true, "processed": true } Server code Let's publish two "views" of the same server collection. One will send down a cursor with 50 records, and the other will send down a cursor with 100 records. There are over 458 million records in this fictitious server-side database, and the client does not need to know about all of those (in fact, sending them all down would probably take several hours in this example): var Items = new Meteor.Collection("items"); Meteor.publish("enabled_items", function () { // Only 50 "Items" have enabled set to true return Items.find({enabled: true}); }); Meteor.publish("processed_items", function () { // Only 100 "Items" have processed set to true return Items.find({processed: true}); }); Client code In order to support the latency compensation technique, we are forced to declare a single collection Items on the client. It should become apparent where the flaw is: how does one differentiate between Items for enabled_items and Items for processed_items? var Items = new Meteor.Collection("items"); Meteor.subscribe("enabled_items", function () { // This will output 50, fine console.log(Items.find().count()); }); Meteor.subscribe("processed_items", function () { // This will also output 50, since we have no choice but to use // the same "Items" collection. console.log(Items.find().count()); }); My current solution involves monkey-patching _publishCursor to allow the subscription name to be used instead of the collection name. But that won't do any latency compensation. Every write has to round-trip to the server: // On the client: var EnabledItems = new Meteor.Collection("enabled_items"); var ProcessedItems = new Meteor.Collection("processed_items"); With the monkey-patch in place, this will work. But go into Offline mode and changes won't appear on the client right away -- we'll need to be connected to the server to see changes. What's the correct approach?

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  • How to log sql statements in grails

    - by damian
    Hi I want to log in the console or in a file, all the queries that Grails do, to check performance. I had configured [this][1] without success. Any idea would help. [1]: http://www.grails.org/FAQ#Q: How can I turn on logging for hibernate in order to see SQL statements, input parameters and output results?

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  • Serialize ASP.NET Web Service HTTP POST request results

    - by nigative
    I am trying to serialize my webmethod output (rename XML element with results), So far [return: System.Xml.Serialization.SoapElementAttribute("results")] before method declaration works fine with soap requests, but I am looking for something that would work the same way with HTTP POST/GET requests as well (right now I get return class name as element name)

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  • When using the Auth component with CakePHP, I keep ketting this error. Why?

    - by Josh Brown
    Warning (2): Cannot modify header information - headers already sent by (output started at /Applications/MAMP/htdocs/iframeworking/iframe/app/models/frame.php:7) [COREcake/libs/controller/controller.php, line 647] here is the code from frame.php: <?php class Frame extends AppModel { var $name = 'Frame'; var $belongsTo = array('User' => array('className' => 'User', 'dependent' => true)); } ?>

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  • Perl chomp backwording the string

    - by joe
    my $cmd = "grep -h $text $file2 $file1 | tail -1 | awk '{print \$NF }' "; my $port_number; $port_number =`$cmd`; print "port No : ==$port_number=="; the output is : "port No :== 2323 == and i tried chomp its not working

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  • 500 error with CodeIgniter

    - by feylya
    I have just moved my CodeIgniter project to a new server and now I'm getting a 500 error and no output from the project. It works fine on my old server and in my test environment. I'm completely stumped how to troubleshoot this, especially as there's nothing of use in the log files. Any help would be great!

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  • Why do I get a WCF timeout even though my service call and callback are successful?

    - by KallDrexx
    I'm playing around with hooking up an in-game console to a WCF interface, so an external application can send console commands and receive console output. To accomplish this I created the following service contracts: public interface IConsoleNetworkCallbacks { [OperationContract(IsOneWay = true)] void NewOutput(IEnumerable<string> text, string category); } [ServiceContract(SessionMode = SessionMode.Required, CallbackContract = typeof(IConsoleNetworkCallbacks))] public interface IConsoleInterface { [OperationContract] void ProcessInput(string input); [OperationContract] void ChangeCategory(string category); } On the server I implemented it with: public class ConsoleNetworkInterface : IConsoleInterface, IDisposable { public ConsoleNetworkInterface() { ConsoleManager.Instance.RegisterOutputUpdateHandler(OutputHandler); } public void Dispose() { ConsoleManager.Instance.UnregisterOutputHandler(OutputHandler); } public void ProcessInput(string input) { ConsoleManager.Instance.ProcessInput(input); } public void ChangeCategory(string category) { ConsoleManager.Instance.UnregisterOutputHandler(OutputHandler); ConsoleManager.Instance.RegisterOutputUpdateHandler(OutputHandler, category); } protected void OutputHandler(IEnumerable<string> text, string category) { var callbacks = OperationContext.Current.GetCallbackChannel<IConsoleNetworkCallbacks>(); callbacks.NewOutput(text, category); } } On the client I implemented the callback with: public class Callbacks : IConsoleNetworkCallbacks { public void NewOutput(IEnumerable<string> text, string category) { MessageBox.Show(string.Format("{0} lines received for '{1}' category", text.Count(), category)); } } Finally, I establish the service host with the following class: public class ConsoleServiceHost : IDisposable { protected ServiceHost _host; public ConsoleServiceHost() { _host = new ServiceHost(typeof(ConsoleNetworkInterface), new Uri[] { new Uri("net.pipe://localhost") }); _host.AddServiceEndpoint(typeof(IConsoleInterface), new NetNamedPipeBinding(), "FrbConsolePipe"); _host.Open(); } public void Dispose() { _host.Close(); } } and use the following code on my client to establish the connection: protected Callbacks _callbacks; protected IConsoleInterface _proxy; protected void ConnectToConsoleServer() { _callbacks = new Callbacks(); var factory = new DuplexChannelFactory<IConsoleInterface>(_callbacks, new NetNamedPipeBinding(), new EndpointAddress("net.pipe://localhost/FrbConsolePipe")); _proxy = factory.CreateChannel(); _proxy.ProcessInput("Connected"); } So what happens is that my ConnectToConsoleServer() is called and then it gets all the way to _proxy.ProcessInput("Connected");. In my game (on the server) I immediately see the output caused by the ProcessInput call, but the client is still stalled on the _proxy.ProcessInput() call. After a minute my client gets a JIT TimeoutException however at the same time my MessageBox message appears. So obviously not only is my command being sent immediately, my callback is being correctly called. So why am I getting a timeout exception? Note: Even removing the MessageBox call, I still have this issue, so it's not an issue of the GUI blocking the callback response.

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  • Post and get at the same time in php

    - by user225269
    Do you have any suggestions with my problem. I need to use get and post at the same time. Get because I need to output what the user has typed. And post because I need to access the mysql database in relation to that input. It looks something like this: <form name="x" method="get" action="x.php"> <input name="year" type="text"> <select name="general" id="general"> <font size="3"> <option value="YEAR">Year</option> </form> This will output the contents of mysql depending on what the user will check: <form name="y" method="post" action"y.php"> <input name="fname" type="checkbox"> </form> And the form action of those two combined will look something like this: <?php if($_POST['general'] == 'YEAR'){ ?> <?php echo $_GET["year"]; ?> <?php $result2 = mysql_query("SELECT * FROM student WHERE student.YEAR='$syear'"); ?> <table border='1'> <tr> <?php if ( $ShowLastName ) { ?><th>LASTNAME</th><?php } ?> <?php if ( $ShowFirstName ) { ?><th>FIRSTNAME</th><?php } ?> </tr> <?php while ( $row = mysql_fetch_array($result2) ) { if (!$result2) { } ?> <tr> <td><?php echo $row['IDNO']?> </td> <td><?php echo $row['YEAR'] ?> </td> <?php if ( $ShowLastName ) { echo('<td>'.$row['LASTNAME'].'</td>'); } ?></td> <?php if ( $ShowFirstName ) { echo('<td>'.$row['FIRSTNAME'].'</td>'); } ?> I really get lots of undefined errors when I do this. What can you recommend that I should do in order to get the value inputted by the user together with the mysql data.

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  • CPU ordering in Linux (with hyper threading)

    - by Jason
    I'm curious what the CPU ordering is in Linux. Say I bind a thread to cpu0 and another to cpu1 on a hyperthreaded system, are they both going to be on the same physical core. Given a Core i7 920 with 4 cores and hyperthreading, the output of /proc/cpuinfo has me thinking that cpu0 and cpu1 are different physical cores, and cpu0 and cpu4 are on the same physical core. Thanks.

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  • How to optimize class for viewstate

    - by Jeremy
    If I have an object I need to store in viewstate, what kinds of things can I do to optimize the size it takes to store the object? Obviously storing the least amount of data will take less space, but aside from that, are there ways to architect the class, properties, attrbutes etc, that will effect how large the serialized output is?

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  • Python timezone issue?

    - by Timmy
    im having troubles with parsing a feed and getting the time. i am using dateutil.parser from dateutil.parser import parse print updated, parse(updated ), parse( updated ).utcoffset() this should be a time in cali, output 2010-05-20T11:00:00.000-07:00 2010-05-20 11:00:00.000000-07:00 -1 day, 17:00:00 why is the offset -1 day 17 hours? this is causing me issues when i try to do things with it

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  • appengine log console extremely slow

    - by Joey
    I am using the python app engine and finding that the log console on the local development server is terribly slow. Output to this window seems to show in chunks of about 5-15 lines every second. Is that typical? I find that it's so slow that it hinders my debugging time waiting for log data to appear.

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  • replace NA in an R vector with adjacent values

    - by pssguy
    I have a dataframe which has merged player and team data for soccer seasons So for a particular player in a specific season I have data like df <- data.frame(team=c(NA,"CRP",NA,"CRP","CRP",NA), player=c(NA,"Ed",NA,"Ed","Ed",NA), playerGame= c(NA,1,NA,2,3,NA), teamGame =c(1,2,3,4,5,6)) Where the NA's indicate that the player did not appear in that specific team game How would I most efficiently replace the team and player NA's with "CRP" and "Ed" respectively and have a plGame output of, in this instance, 0,1,1,2,3,3

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  • How to show Iplmage format on the GUI of C++ instead of showing it in another windows?

    - by Darren
    I'm trying to display the output image onto the C++ interface instead of creating another window to display the image. For example: cvNameWindow("Window A",0); cvShowImage("Window A", imgA); This will create an window and display the imgA on it. My question is that can i display my imgA onto my C++ interface together with all my other button and textbox. I'm using Borland C++ Builder 6 and OpenCV.

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