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  • Single-Page Web Apps: Client-side datastores & server persistence

    - by fig-gnuton
    How should client-side datastores & persistence be handled in a single-page web application? Global vars vs. DI/IoC: Should datastores be assigned to global variables so any part of the application can access them? Or should they be dependency injected where required? Server persistence: Assuming a datastore's data needn't always be persisted to the server immediately, should the datastore itself handle persistence? If not, then what class should handle persistence and how should the persistence class fit into the client-side architecture overall? Is the datastore considered the model in MVC, or is it something else since it just stores raw data?

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  • Using client time to calculate timezone

    - by Mike TK
    Hi Folks, Instead of asking a client timezone in registration form (to correctly format datetime, all server dates in UTC) I thought about fetching a time from client computer and calculating time offset between client and server. Anyone tried this? How often clients have something insane on their system clocks? Cheers!

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  • XML RPC client for C# over secured socket (https)

    - by Ummar
    I have a secured (https) XML-RPC server written in python, and I have tested it with a python based client. but I need a C# based client for it, I have given a try to xml-rpc.net but it is not working with https? can any one please help me out? or I will have to write a client from scratch? Thanks

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  • RMI client tracking

    - by 0000
    I'm building a Client / Server app that has some very specific needs. There are 2 kinds of servers: the first kind provide most of the remote procedures and clients connect to these directly, while the second kind is a single server that should keep track of what users are active (clients) and how many servers of the first kind are active when a method is called. The main thing is that the monitor should ONLY connect to the servers and not the clients directly. My first idea was to implement a simple login/logout rmi method when a client connects/ disconnects and keep track of those in a list but the main problem is when a client or server end abnormally. For example, if a client goes offline abruptly the server should somehow be notified and update the list accordingly, while if a server goes out all of the clients connected to it should be marked as not active in the control server. Any ideas of how to implement this functionality would be appreciated.

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  • event vs thread programming on server side.

    - by AlxPeter
    We are planning to start a fairly complex web-portal which is expected to attract good local traffic and I've been told by my boss to consider/analyse node.js for the serve side. I think scalability and multi-core support can be handled with an Nginx or Cherokee up in the front. 1) Is this node.js ready for some serious/big business? 2) Does this 'event/asynchronous' paradigm on server side has the potential to support the heavy traffic and data operation ? considering the fact that 'everything' is being processed in a single thread and all the live connections would be lost if it got crashed (though its easy to restart). 3) What are the advantages of event based programming compared to thread based style ? or vice-versa. (I know of higher cost associated with thread switching but hardware can be squeezed with event model.) Following are interesting but contradicting (to some extent) papers:- 1) http://www.usenix.org/events/hotos03/tech/full_papers/vonbehren/vonbehren_html 2) http://pdos.csail.mit.edu/~rtm/papers/dabek:event.pdf

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  • How to organize RMI Client-Server eBanking architecture

    - by xenom
    I am developing a secured eBanking service in RMI with a GUI both for Server and Client. The Server must be able to log every operations (new User, deleted User, Withdrawal, Lodgement...) The Client will do these operations. As everything is secured, the Client must at first, create an account with a name and a password in the GUI. After that, the GUI adds the User in the Bank UserList(arrayList) as a new Customer and the User can do several operations. It seems straightforward at first but I think my conception is not correct. Is it correct to send the whole Bank by RMI ? Because at first I thought Bank would be the server but I cannot find another way to do that. Currently, the Client GUI asks for a login and a password, and receives the Bank by RMI. A User is characterized by a name and a hash of the password. private String name; private byte[] passwordDigest; In fact the GUI is doing every security checking and I don't know if it's relevant. When you type login//password, it will search the login in the Bank and compare the hash of the password. In fact I have the impression that the Client knows too much information because when you have the Bank you have everything.. Does it seem correct or do I need to change my implementation ?

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  • Client/Server communication via internet

    - by user957829
    Hi, Which is the best solution to communicate bidirectionally between a remote server and a client behind an internet box? UPnP with Sockets. HTTPS/Database Server and the client make 1 request every Xsec to know if there is new data. Client opens 1 connection on the server and it maintains open to make a tunnel. Thanks in advance for your help

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  • Image ransfer using hessian protocol from client's folder to tomcat server

    - by ?? ?
    My goal is to upload a image(.jpg or .png)from client's folder to tomcat6 server through hessian protocol. And do image processing using opencv on server, then return the image back to client. Question1. Is the following transfering steps correct? put a test.jpg image on client's folder -- convert the test.jpg in client.java(main.java) class to BufferedImage -- convert the BufferedImage to mat or Iplimage in server for using openCV.I have set a hello world sample from Simple Messaging Example using Hessian , and searched from Hessian with large binary data and other websites, but still dont know how to use it! Question2. Is there a related JAVA sample code? Thank you very much. Btw, I am using ubuntu12+netbeans7.2

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  • JQuery Active Refresh Not Working After Server-Side Redirect

    - by Ömer Faruk AK
    I have a page which is refreshing actively every 5 second. But when i click a button from the page which is redirect to itself at server-side and then it's not refreshing. What can i do? JQuery Code; <script type="text/javascript" charset="${_response_encoding}"> // Reload the whole messages panel var refresh = function() { $('#thread').load('@{room()} #thread', function() { $('#thread').trigger('create'); }); } var create = function(){ $('#thread').trigger('create'); } // Call refresh every 5 seconds $(document).ready(setInterval(refresh, 5000)); </script> Server-Side Code; public static void served(Long servingID) { Serving serv = Serving.findById(servingID); serv.isServed = true; serv.save(); index(); }

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  • recommend a server side technology for gwt (beginner)

    - by user486503
    hi all ! I am developing a gwt project and am looking for an appropriate server side technology. it should support be open source and support user login (and not using openID...) with password recovery etc it seems that the de-facto standard would be spring + hibernate. however, I am unfamiliar with neither of them and understand that the learning curve (especially for spring) is very high. gwt was quite easy to learn using GOOG's excellent online tutorials but the spring equivalent seem to impose lots of configuration files and deeper understanding of its internals. so I am looking for a simpler server side technology to deploy my gwt app. I am definitely prepared to learn a new framework if necessary but not something that would take me 2 months just to understand the fundamentals... any ideas...?

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  • conditional selects with jQuery and the Validation plugin

    - by dbonomo
    Hi, I've got a form that I am validating with the jQuery validation plugin. I would like to add a conditional select box (a selection box that is populated/shown depending on the selection of another) and have it validate as well. Here is what I have so far: $(document).ready(function(){ $("#customer_information").validate({ //disable the submit button after it is clicked to prevent multiple submissions submitHandler: function(form){ if(!this.wasSent){ this.wasSent = true; $(':submit', form).val('Please wait...') .attr('disabled', 'disabled') .addClass('disabled'); form.submit(); } else { return false; } }, //Customizes error placement errorPlacement: function(error, element) { error.insertAfter(element) error.wrap("<div class=\"form_error\">") } }); $(".courses").hide(); $("#course_select").change(function() { switch($(this).val()){ case "Certificates": $(".courses").hide().parent().find("#Certificates").show(); $(".filler").hide(); break; case "Associates": $(".courses").hide().parent().find("#Associates").show(); $(".filler").hide(); break; case "": $(".filler").show(); $(".courses").hide(); } }); }); And the HTML: <select id="course_select"> <option value="">Please Select</option> <option value="Certificates">Certificates</option> <option value="Associates">Associates</option> </select> <div id="Form0" class="filler"><select name="filler_select"><option value="">Please Select Course Type</option></select></div> <div id="Associates" class="courses"> <select name="lead_source_id" id="Requested Program" class="required"> <option value="">Please Select</option> <option value="01">Health Information Technology</option> <option value="02">Human Resources </option> <option value="03">Marketing </option> </select> </div> <div id="Certificates" class="courses"> <select name="lead_source_id" id="Requested Program" class="required"> <option value="">Please Select</option> <option value="04">Accounting Services</option> <option value="05">Bookkeeping</option> <option value="06">Child Day Care</option> </select> </div> So far, the select is working for me, but validation thinks that the field is empty even when a value is selected. It looks like there are a ton of ways to do conditional selects in jQuery. This was the best way I managed to work out (I'm new to jQuery), but I'd love to hear what you folks feel is the "best" way, especially if it works well with the validation plugin. Thanks!

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  • Catch all javascript errors and send them to server

    - by ssaboum
    Hi everyone, i wandered if anyone had experience in handling javascript errors globally and send them from the client browser to a server. I think my point is quite clear, i want to know every exceptions, errors, compilation errors, ... that happens on the client side and send them to the server to report them. I'm mainly using mootools and head.js (for the js side) and django for the server side (not that it matters...). Thank you for your help. Regards.

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  • how to create multiple tcp connections between server and client

    - by lowcosthighperformance
    I am new in Unix/Linux networking programming, so I have written server-client program in below.In this code there is one socket between client and server, client requests to server, then server responses from 1 to 100 numbers to client. So my question is how can we do this process with 3 socket( tcp connection) without using thread? ( e.g. First socket runs then second runs then third runs then first again .. ) Do you have any suggestion? Thank you client.c int main() { int sock; struct sockaddr_in sa; int ret; char buf[1024]; int x; sock = socket (AF_INET, SOCK_STREAM, 0); bzero (&sa, sizeof(sa)); sa.sin_family = AF_INET; sa.sin_port = htons(SERVER_PORT); inet_pton (AF_INET, SERVER_IP, &sa.sin_addr); ret = connect (sock, (const struct sockaddr *) &sa,sizeof (sa)); if (ret != 0) { printf ("connect failed\n"); exit (0); } x = 0; while (x != -1) { read (sock, buf , sizeof(int)); x = ntohl(*((int *)buf)); if (x != -1) printf ("int rcvd = %d\n", x); } close (sock); exit (0); } server.c int main() { int list_sock; int conn_sock; struct sockaddr_in sa, ca; socklen_t ca_len; char buf[1024]; int i; char ipaddrstr[IPSTRLEN]; list_sock = socket (AF_INET, SOCK_STREAM, 0); bzero (&sa, sizeof(sa)); sa.sin_family = AF_INET; sa.sin_addr.s_addr = htonl(INADDR_ANY); sa.sin_port = htons(SERVER_PORT); bind (list_sock,(struct sockaddr *) &sa,sizeof(sa)); listen (list_sock, 5); while (1){ bzero (&ca, sizeof(ca)); ca_len = sizeof(ca); // important to initialize conn_sock = accept (list_sock,(struct sockaddr *) &ca,&ca_len); printf ("connection from: ip=%s port=%d \n",inet_ntop(AF_INET, &(ca.sin_addr), ipaddrstr, IPSTRLEN),ntohs(ca.sin_port)); for (i=0; i<100; ++i){ *((int *)buf) = htonl(i+20); // we using converting to network byte order write (conn_sock, buf, sizeof(int)); } * ((int *)buf) = htonl(-1); write (conn_sock, buf, sizeof(int)); close (conn_sock); printf ("server closed connection to client\n"); } }

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  • Methods for breaking up content client-side into multiple "pages"

    - by Tom Genoni
    I have a long HTML text-only article formatted with paragraph tags. What I'd like to do is break this content into N number of divs so that I can create individual pages. So, for instance, on an iPad/iPhone, instead of reading one long page the user could swipe right/left to navigate to pages. My initial javascript attempts have been somewhat convoluted: creating an array of the text, measuring line-heights, device window heights, adding closing/opening paragraph tags and the end/beginning of pages. Thoughts on a good way to approach this? I will not have access to server-side processing, this has to be a client-side solution.

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  • WCF client side List<> problem

    - by MrKanin
    Hey there.. i got a WCF service with a method (GetUserSoftware)to send a List to a client. the software i have difined like this: [DataContract] public class Software { public string SoftwareID { get; set; } public string SoftwareName { get; set; } public string DownloadPath { get; set; } public int PackageID { get; set; } } the method is going through my db to get all software availeble to the clien, and generates a list of that to send back to the client. problem is i on the client side the list is turned into an array. and every item in that array dont contain any of my software attributs. i have debugged my way through the server side. and seen that the list its about to send is correct. with the expected software and attributs in it. any one know how to work around this or know what i can do ?

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  • Remote Email Access?

    - by Tyler
    I have remote email access from an iPhone or my Android phone, but I cannot setup a Windows Email Client to check my email using the exact same information I provided in my phones. The email system is an Exchange 2003 and I hate using the cheap Outlook Web App that it has. User: [email protected] Password: 1234 Server: mail.domain.com And that works for they phones. So why can't I get it to work on my email client? Maybe a DNS problem?

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  • Evolution on Fedora w/ X - Setup Assistant?

    - by codemonkey
    Very odd... logged in to my dev machine this morning and Evolution mail client's "Setup Assistant" pops up as though I hadn't been actively using Evolution as my primary mail client for the past six months?!?! Am googling for answer and hearing of the random person who has had something similar happen, but as of yet I've been unable to find discussions where a cause and/or fix was discovered. Any ideas?

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  • No internet connection with Cisco VPN

    - by Macros
    I have a VPN connection set up using the Cisco VPN Client, and whenever I connect to it I lose my internet connection. This is the first time I have used this software, all previous VPNs I have used have been setup through Windows and I can uncheck the 'use remote gateway' box in the TCP-IP properties box to get around this. Is there a similar option in the Cisco Client that I am missing? I am running on Windows 7 32 bit

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  • Detecting validation errors in Silverlight 4

    - by jkohlhepp
    I'm using the new Silverlight 4 support for IDataErrorInfo. So I have a POCO object that has implemented the interface, and when a validation rule fires the Silverlight UI correctly shows the error. So that is all working fine. The POCO object looks like this: public class SomeDomainClass : IDataErrorInfo { public string SomeString { get; set; } public string Error { get { return String.Empty; } } public string this[string columnName] { get { if (columnName == "SomeString" && PolicyNumber.Contains("%")) return "SomeString cannot contain '%'. You'll ruin everything!!!"; return String.Empty; } } } However, I want to be able to detect whether or not there are any errors on the page. For example if I have a Save button and I want to disable it if there are errors, or display a message or something. What is the best way to detect if there are existing validation errors on the page? Is there a facility for this based around the IDataErrorInfo support in Silverlight? Or do I have to track it in the domain model myself?

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  • How to change ErrorMessage property of the DataAnnotation validation in MVC2.0

    - by Raj Aththanayake
    My task is to change the ErrorMessage property of the DataAnnotation validation attribute in MVC2.0. For example I should be able to pass an ID instead of the actual error message for the Model property and use that ID to retrieve some content(error message) from a another service e.g database, and display that error message in the View instead of the ID. In order to do this I need to set the DataAnnotation validation attribute’s ErrorMessage property. [StringLength(2, ErrorMessage = "EmailContentID.")] [DataType(DataType.EmailAddress)] public string Email { get; set; } It seems like an easy task by just overriding the DataAnnotationsModelValidatorProvider ‘s protected override IEnumerable GetValidators(ModelMetadata metadata, ControllerContext context, IEnumerable attributes) However it seems to be a complicated enough. a. MVC DatannotationsModelValidator’s ErrorMessage property is read only. So I cannot set anything here b. System.ComponentModel.DataAnnotationErrorMessage property(get and set) which is already set in MVC DatannotationsModelValidator so we cannot set again. If you try to set you get “The property cannot set more than once…” error message appears. public class CustomDataAnnotationProvider : DataAnnotationsModelValidatorProvider { protected override IEnumerable GetValidators(ModelMetadata metadata, ControllerContext context, IEnumerable attributes) { IEnumerable validators = base.GetValidators(metadata, context, attributes); foreach (ValidationAttribute validator in validators.OfType<ValidationAttribute>()) { validator.ErrorMessage = "Error string from DB"; } //...... } Can anyone please help me on this?

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