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• How does one make sure or even guarantee server time are sync correctly between dozens of servers across multiple datacenter on different location?

  - by forestclown

  Currently our web applications contain a logic to check if the data sent to the web server is expired or not by comparing the timestamp of the data with the date/time of the server. Everything goes will, until some dude from data center accidentally modify one of the web server date/time and causes some disruptions in our web services. My managers are of course not happy with this, and said we shouldn't use timestamp to check expiry in the first place...anyway.... Network Time Protocol is implemented, because of data centers are spread across different continents so we have one NTP server in each data center. The servers within the data center will have cron jobs to check against the time with their NTP server from the same data center. If time is out of sync it will auto update the server date/time. But then with our managers not happy with it, and think it could still easily causes the same problem. e.g. what if someone accidentally modify the NTP date/time? what if all the NTP servers are out of sync with each other? which NTP servers we can really trust? and blah blah.. So my questions are: What are the current practice to sync date/time between servers across multiple data centers or locations? How does one manages time stamp between web apps? e.g. Server A send data (contain timestamp of Server A) to Server B (compare timestamp between Server B and the timestamp from the data to see if it has expired or not. This is to avoid HTTP replay) Should we really not use timestamp check? Thanks & Best Regards

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• Extending the Facebook Oauth 2.0 Access Token Expiration Time

  - by Jared Brown

  I am playing around with the Oauth 2.0 authorization in Facebook and was wondering if there is a way to request a longer lifespan on the access token? It appears the access tokens being handed out last for a little over an hour by default.

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• WCF net.tcp windows service - call duration and calls outstanding increases over time

  - by Brook

  I have a windows service which uses the ServiceHost class to host a WCF Service using the net.tcp binding. I have done some tweaking to the config to throttle sessions as well as number of connections, but it seems that every once in a while my "Calls outstanding" and "Call duration" shoot up and stay up in perfmon. It seems to me I have a leak somewhere, but the code I have is all fairly minimal, I'm relying on ServiceHost to handle the details. Here's how I start my service ServiceHost host = new ServiceHost(type); host.Faulted+=new EventHandler(Faulted); host.Open(); My Faulted event just does the following (more or less, logging etc removed) if (host.State == CommunicationState.Faulted) { host.Abort(); } else { host.Close(); } host = new ServiceHost(type); host.Faulted+=new EventHandler(Faulted); host.Open(); Here's some snippets from my app.config to show some of the things I've tried <runtime> <gcConcurrent enabled="true" /> <generatePublisherEvidence enabled="false" /> </runtime> ......... <behaviors> <serviceBehaviors> <behavior name="Throttled"> <serviceThrottling maxConcurrentCalls="300" maxConcurrentSessions="300" maxConcurrentInstances="300" /> .......... <services> <service name="MyService" behaviorConfiguration="Throttled"> <endpoint address="net.tcp://localhost:49001/MyService" binding="netTcpBinding" bindingConfiguration="Tcp" contract="IMyService"> </endpoint> </service> </services> .......... <netTcpBinding> <binding name="Tcp" openTimeout="00:00:10" closeTimeout="00:00:10" portSharingEnabled="true" receiveTimeout="00:5:00" sendTimeout="00:5:00" hostNameComparisonMode="WeakWildcard" listenBacklog="1000" maxConnections="1000"> <reliableSession enabled="false"/> <security mode="None"/> </binding> </netTcpBinding> .......... <!--for my diagnostics--> <diagnostics performanceCounters="ServiceOnly" wmiProviderEnabled="true" /> There's obviously some resource getting tied up, but I thought I covered everything with my config. I'm only getting about ~150 clients so I don't think I'm coming up against my "300" limit. "Calls per second" stays constant at anywhere from 2-5 calls per second. The service will run for hours and hours with 0-2 "calls outstanding" and very low "call duration" and then eventually it will shoot up to 30 calls oustanding and 20s call duration. Any tips on what might be causing my "calls outstanding" and "call duration" to spike? Where am I leaking? Point me in the right direction?

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• WCF: Using Streaming and Username/Password authentication at the same time

  - by Kay

  Hi, I have a WCF Service with the following requirements: a) The client requests a file from the server which is transferred as a Stream. Files may be 100MB or larger. I need streaming or chucking or whatever to make sure that IIS is not loading the whole package into memory before starting to send it. b) The client will transfer an ID to identify the file to be downloaded. The user should be authenticated by providing username/password. c) While the username/password part of the communication needs to be encrypted, encryption of the downloaded file is optional for our use case. My other services, where I am returning smaller files, I am using the following binding: <ws2007HttpBinding> <binding name="ws2007HttpExtern" maxReceivedMessageSize="65536000"> <security mode="Message"> <message clientCredentialType="UserName" /> </security> </binding> </ws2007HttpBinding> But, as I said, that is no good for streaming (Message encryption needs the complete message to encrypt and that is not the case when streaming). So, I asked Microsoft support and I got more or less the following proposal: <bindings> <basicHttpBinding> <binding name="basicStreaming" messageEncoding="Mtom" transferMode="StreamedResponse"> <security mode="Transport"> <transport clientCredentialType="Basic" /> </security> </binding> </bindings> <services> <service behaviorConfiguration="MyProject.WCFInterface.DownloadBehavior" name="MyProject.WCFInterface.DownloadFile"> <endpoint address="" binding="basicHttpBinding" bindingConfiguration="basicStreaming" contract="MyProject.WCFInterface.IDownloadFile" /> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" /> </service> </services> <behaviors> <serviceBehaviors> <behavior name="MyProject.WCFInterface.DownloadBehavior"> <serviceMetadata httpGetEnabled="false" httpsGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="true" /> </behavior> </serviceBehaviors> </behaviors> When I use this, I get the following error message: Could not find a base address that matches scheme https for the endpoint with binding BasicHttpBinding. Registered base address schemes are [http]. I am using the Web Development Server so far (for production IIS7). I have two questions. a) How would you configure WCF to achieve the goal? b) If the MS proposal is good: What I am doing wrong, the error message does not really help me. Thanks.

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• Very large database, very small portion most being retrieved in real time

  - by ming yeow

  Hi folks, I have an interesting database problem. I have a DB that is 150GB in size. My memory buffer is 8GB. Most of my data is rarely being retrieved, or mainly being retrieved by backend processes. I would very much prefer to keep them around because some features require them. Some of it (namely some tables, and some identifiable parts of certain tables) are used very often in a user facing manner How can I make sure that the latter is always being kept in memory? (there is more than enough space for these) More info: We are on Ruby on rails. The database is MYSQL, our tables are stored using INNODB. We are sharding the data across 2 partitions. Because we are sharding it, we store most of our data using JSON blobs, while indexing only the primary keys

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• Using two versions of the same assembly (system.web.mvc) at the same time

  - by Joel Abrahamsson

  I'm using a content management system whose admin interface uses MVC 1.0. I would like to build the public parts of the site using MVC 2. If I just reference System.Web.Mvc version 2 in my project the admin mode doesn't work as the reference to System.Web.Mvc.ViewPage created by the views in the admin interface is ambiguous: The type 'System.Web.Mvc.ViewPage' is ambiguous: it could come from assembly 'C:\Windows\assembly\GAC_MSIL\System.Web.Mvc\2.0.0.0__31bf3856ad364e35\System.Web.Mvc.dll' or from assembly 'C:\Windows\assembly\GAC_MSIL\System.Web.Mvc\1.0.0.0__31bf3856ad364e35\System.Web.Mvc.dll'. Please specify the assembly explicitly in the type name. I could easily work around this by using binding redirects to specify that MVC 2 should always be used. Unfortunately the content management systems admin mode isn't compatible with MVC 2. I'm not exactly sure why, but I start getting a bunch of null reference exceptions in some of it's actions when I try it and the developers of the CMS have confirmed that it isn't compatible with MVC 2 (yet). The admin interface which is accessed through domain.com/admin is not physically located in webroot/admin but in the program files folder on the server and domain.com/admin is instead routed there using a virtual path provider. Therefor, putting a separate web.config file in the admin folder to specify a different version of System.Web.Mvc for that part of the site isn't an option as that won't fly when using shared hosting. Can anyone see any solution to this problem? Perhaps it's possible to specify that for some assemblies a different version of a referenced assembly should be used?

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• Java: JPQL date function to add a time period to another date

  - by bguiz

  SELECT x FROM SomeClass WHERE x.dateAtt BETWEEN CURRENT_DATE AND (CURRENT_DATE + 1 MONTH) In the above JPQL statement, SomeClass has a memebr dateAttr, which is a java.util.Date and has a @Temporal(javax.persistence.TemporalType.DATE) annotation. I need a way to do the (CURRENT_DATE + 1 MONTH) bit - it is obviously wrong in its current state - but cannot find the doc with the date function for JPQL. Can anyone point me in the direction of a doc that documents JPQL date functions (and also how to do this particular query)?

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• ASPx GridView , combobox inside of detailed grid, all the time has null value on Updating

  - by evgelen

  I have a combobox inside of detailed Devexpress grid. In edit mode on Updating event the combobox always has e.OldValues and e.NewValues always null, even when you change it.. any ideas or work around ??? Please see my code below <-PropertiesComboBox DataSourceID="DataSource" TextField="Name" ValueField="ID" ValueType="System.Int32" protected void ASPxGridView2_RowUpdating(object sender, ASPxDataUpdatingEventArgs e) { object test1 = e.NewValues["Email"]; e.Cancel = true; }

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• Android AppWidget TextView: How to set background color at run time

  - by Amit

  I am trying to create an AppWidget, in which the background color of a TextView changes at random at specified periodic interval. The TextView is defined in layout xml file as <?xml version="1.0" encoding="utf-8" ?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/widget" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/message" android:background="#ff99ff" android:text="Hello Widget" /> </LinearLayout> In update method, i have loaded the layout as RemoteViews remoteView=new RemoteViews(context.getPackageName(),R.layout.widget_message); To change the background of TextView i used the following statement remoteView.setInt(R.id.message, "setBackgroundResource", R.color.col_1); But i am getting a widget saying problem loading widget. If i remove the above line everything works fine. LogCat says: updateAppWidget couldn't find any view, using error view android.widget.RemoteViews$ActionException: view: android.widget.TextView can't use method with RemoteViews: setBackgroundResource(int)

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• String to Date/Time

  - by theblip

  I have a serialized DateTime string which looks like this: 2010-04-14T16:32:06.75+10:00 What is the simplest way of deserializing/parsing it back into a DateTime?

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• WCF timeout exception on calling service on 11th time

  - by Sergej Andrejev

  I'm creating a WCF service and stumbled with request timeout problem. When I load test the service the 11th call always fails with "System.Net.WebException: The operation has timed out". I have read that would happen if serviceThrotling is set to defaults so I added following lines to my service configuration file <behavior name="ServiceBehavior"> <!-- ... --> <serviceThrottling maxConcurrentCalls="100" maxConcurrentSessions="100" maxConcurrentInstances="100" /> </behavior> But this doesn't help. I thought that closing the proxy might be a problem, but I do close all proxies. try { response = service.GetCustomerHdQuotes(request); } finally { try { if (service.State != CommunicationState.Faulted) service.Close(); else service.Abort(); // Abort if the State is Faulted. } catch (Exception) { service.Abort(); } } I also have an idea that inside service some resources pile up preventing service to accept new connections, but the fact that this is always 11th request points that this is more likely due to some configuration problems. Can anybody help me with that?

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• scrolling two panels at same time c# winForms

  - by jello

  yea so I have 2 panels with the same width and the same width of data in them. the top panel has autoscroll enabled. I would like to be able to scroll both panels, with the top panel scrollbar. which means that the bottom panel doesn't have a scroll bar. How would I do that?

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• Joda time : convert string to LocatDate

  - by bsreekanth

  Hello, How to specify the format string to convert the date alone from string. In my case, only the date part is relevant Constructing it as DateTime fails String dateString = "2009-04-17"; DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd"); DateTime dateTime = formatter.parseDateTime(dateString); with error java.lang.IllegalArgumentException: Invalid format: "2011-04-17" is too short Probably because I should use LocalTime instead. But, I do not see any formatter for LocalTime . What is the best way to convert String dateString = "2009-04-17"; into LocalDate (or something else if that is not the right representation) thanks...

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• XStream parse attributes and values at the same time

  - by gurbieta

  Hi, I have the following XML <search ver="3.0"> <loc id="ARBA0009" type="1">Buenos Aires, Argentina</loc> <loc id="BRXX1283" type="1">Buenos Aires, Brazil</loc> <loc id="ARDF0127" type="1">Aeroparque Buenos Aires, Argentina</loc> <loc id="MXJO0669" type="1">Concepcion De Buenos Aires, Mexico</loc> <loc id="MXPA1785" type="1">San Nicolas De Buenos Aires, Mexico</loc> <loc id="ARBA0005" type="1">Balcarce, Argentina</loc> <loc id="ARBA0008" type="1">Bragado, Argentina</loc> <loc id="ARBA0010" type="1">Campana, Argentina</loc> <loc id="ARBA0016" type="1">Chascomus, Argentina</loc> <loc id="ARBA0019" type="1">Chivilcoy, Argentina</loc> </search> And a City class public class City { private String id; private Integer type; private String name; // getters & setters... } I tried the following aliases to parse the XML xStream.alias("search", List.class); xStream.alias("loc", City.class); xStream.useAttributeFor("id", String.class); xStream.useAttributeFor("type", Integer.class); But I can't figure out how to set the value of the "loc" tag, if I try to transform the City object in XML I get <search> <loc id="ARBA0001" type="1"> <name>Buenos Aires</name> </loc> </search> When I really need to get this <search> <loc id="ARBA0001" type="1">Buenos Aires</loc> </search> Then, if I try to parse the XML to a City object I get the field "name" with a null value. Anybody knows how to set te correct aliases to do this? Thanks in advance.

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• RadControl DateTimePicker Selecting new time doesn't remove highlight from previous selection

  - by Jason Beck

  This is not browser specific - the behavior exists in Firefox and IE. The RadControl is being used within a User Control in a SiteFinity site. Very little customization has been done to the control. <telerik:RadDateTimePicker ID="RadDateTimePicker1" runat="server" MinDate="2010/1/1" Width="250px"> <ClientEvents></ClientEvents> <TimeView starttime="08:00:00" endtime="20:00:00" interval="02:00:00"></TimeView> <DateInput runat="server" ID="DateInput"></DateInput> </telerik:RadDateTimePicker> protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { RadDateTimePicker1.MinDate = DateTime.Now; } }

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• Casting an object to two interfaces at the same time, to call a generic method

  - by Bruno Martinez

  I want to call a generic method that constrains the input type T to implement two interfaces: interface IA { } interface IB { } void foo<T>(T t) where T : IA, IB { } How can I fix the last line of void bar(object obj) { if (obj is IA && obj is IB) { foo((IA && IB)obj); } } ? Reflection probably allows to do the call, but I would like to stay within the language.

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• Run time error in vb.net

  - by Muhammed Yoosuf

  I get the following error message in vb.net when I try to run the program Any help is greatly appreciated. Thanks Error 1 Unable to copy file "C:\Users\Mr. M Yoosuf Hassan\Desktop\CD\Software (full version)\Airline Reservation System - Copy\Airline Reservation System\Airline2.mdb" to "bin\Debug\Airline2.mdb". Could not find file 'C:\Users\Mr. M Yoosuf Hassan\Desktop\CD\Software (full version)\Airline Reservation System - Copy\Airline Reservation System\Airline2.mdb'. Airline Reservation System

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• Web serivce time out errors in delphi

  - by JD

  Hi, I have a client application that makes SOAP requests. I have set the timeout to 20 minutes. However, sometimes I see the timeout error occurring after 10 seconds. I have the following in code: RIO.HTTPWebNode.ReceiveTimeout := 1200000 Do I need to set the ConnectTimeout and SendTimeOut? Currently they are set to the default values of 0. What difference would setting these make? I am using Delphi 2007. Looking further at the error message I see I get "The operation timed out....". So should I be setting my ReceiveTimeOut to zero since I really do not want any timeout at all?

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• Auto load a specific link at various time intervals

  - by user228837

  Here's what I need to do. I'm using Google Chrome. I have page that auto-reloads every 5 seconds using a script: javascript: timeout=prompt("Set timeout [s]"); current=location.href; if(timeout>0) setTimeout('reload()',1000*timeout); else location.replace(current); function reload() { setTimeout('reload()',1000*timeout); fr4me='<frameset cols=\'*\'>\n<frame src=\''+current+'\'/>'; fr4me+='</frameset>'; with(document){write(fr4me);void(close())}; } I found that script by Googling. The reason why the page auto-reloads every 5 seconds is I'm waiting for a specific link or url to appear in the page. It appears at random times. Once I see the link I'm waiting for, I immediately click the link. That's fine. But I want more. What I want is the page will auto-reload and I want it to auto-detect the the link I'm waiting for. Once the script finds the link I'm waiting for, it automatically loads that link on a new tab or page. For example, I'm auto-reloading www.example.com. I'm waiting for a specific url "BUY NOW". When the page auto-reloads, it checks if there's a url "BUY NOW". If it sees one, it should automatically open that link. Thanks.

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• Java3D getting time problem

  - by Meko

  HI ..I made little Shooter game that on screen two ships firing each other.I ahve method on paintComponent like drawing or moving object.But in some reason it works different speed on each komputer.I searchand made some modification to my game like drawing and moving objects in thread..Now it works on every ?omputer same speed.Also if I change size.But problem is I used J3DTimer.getValue() .For this library I donwnloaded Java3d. Problem is If on machine there is no this library or installation my game doesnot working .How can I solw this problem? I should say every one to setup Java#d? :)) ALso I used standart System.currentTimeMillis(); but now my game works very slow...Any idea?

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• Real-time wmv video encoding in C#

  - by Greg Roberts

  How to encode video on the fly and send it trough the network from C#? Can't find a suitable library. I need to encode in WMV and don't mind if the actual encoding is made in C++ as long as the library has a .NET assembly available. Thanks

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• PHP real time chat with ajax polling

  - by xRobot

  I need to create a chat similar to facebook chat. I am thinking to use ajax polling ( to send request every 2-3 seconds ). Is this a good approach ? Or I need to use other server side languages like erlang and server-comet ?

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• Joda time : How to convert String to LocalDate?

  - by bsreekanth

  Hello, How to specify the format string to convert the date alone from string. In my case, only the date part is relevant Constructing it as DateTime fails: String dateString = "2009-04-17"; DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd"); DateTime dateTime = formatter.parseDateTime(dateString); with error java.lang.IllegalArgumentException: Invalid format: "2011-04-17" is too short Probably because I should use LocalDate instead. But, I do not see any formatter for LocalDate . What is the best way to convert String dateString = "2009-04-17"; into LocalDate (or something else if that is not the right representation) thanks...

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• python get time in minutes

  - by Hulk

  import datetime start = datetime.datetime(2009, 1, 31) end = datetime.datetime(2009, 2, 1) print end-start >>1 day, 0:00:00//output How to get the output in minutes Thanks,

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• RichFaces rich:insert takes a long time to output large files

  - by Mark Lewis

  Hello I'm using a RichFaces <rich:insert like this: <rich:panel header="my head"> <a4j:outputPanel ajaxRendered="true"> <rich:insert src="#{MyBacking.myPath}" highlight="groovy" /> </a4j:outputPanel> </rich:panel> If I have a 60k file to output, it takes 23 seconds. I've got a requirement to output the contents of some larger files than that and obviously the larger the file, the larger the wait for content. The recommendation in the answer to another related question is to introduce paging. I will, but the question is, why does it take so long to output 60k of text using JSF/RichFaces? That is, reading off a local disk with Windows XP SP2 PC - I can see from the log the data has already been written to disk from the network. Other scripting languages appear to be faster than this - is it something to do with the JSF lifecycle having to handle the text maybe? Thanks

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