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• WCF Duplex Interaction with Web Server

  - by Mark Struzinski

  Here is my scenario, and it is causing us a considerable amount of grief at the moment: We have a vendor web service which provides base level telephony functionality. This service has a SOAP api, which we are leveraging to build up a custom UI that is integrated into our in house web apps. The api functions on 2 levels. You make standard client calls into the service to initiate actions, such as Login, Place Call, Hang Up, etc. On a different thread, the service sends events back to the client to alert the user of things that are occurring on the system (agent successfully logged in, call was disconnected, etc). I implemented a WCF service to sit between the web server and the vendor service. This WCF service operates in duplex mode, establishing a 2 way connection with the web server. The web server makes outbound calls to the WCF service, which routes them to the vendor's web service. Events are received back to the WCF service, which passes them onto the web server via a callback channel on the WCF client. As events are received on the web server, they are placed into a hash table with the user's name as the key, and a .NET queue as the value to hold the event. Each event is enqueued to the agent who owns it. On a 2 second interval, the web page polls the web server via an ajax request to get new events for the logged in user. It hits the hash table for the user key, dequeues any events that are present, and serializes them back up to the web page. From there, they are processed in order and appropriate messages are displayed to the user. This implementation performs well in a single user scenario. The second I put more than 1 user on the system, I start getting frequent timeouts with the following CommunicationException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond We are running Windows Server 2008 R2 both servers. Both the web app and WCF service are running on .NET 3.5. The WCF service is running under the net.tcp protocol in duplex mode. The web app is ASP.NET MVC 2. Has anyone dealt with anything like this scenario? Is there a more efficient way (or a widely accepted pattern) to implement this?

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• Of these 3 methods for reading linked lists from shared memory, why is the 3rd fastest?

  - by Joseph Garvin

  I have a 'server' program that updates many linked lists in shared memory in response to external events. I want client programs to notice an update on any of the lists as quickly as possible (lowest latency). The server marks a linked list's node's state_ as FILLED once its data is filled in and its next pointer has been set to a valid location. Until then, its state_ is NOT_FILLED_YET. I am using memory barriers to make sure that clients don't see the state_ as FILLED before the data within is actually ready (and it seems to work, I never see corrupt data). Also, state_ is volatile to be sure the compiler doesn't lift the client's checking of it out of loops. Keeping the server code exactly the same, I've come up with 3 different methods for the client to scan the linked lists for changes. The question is: Why is the 3rd method fastest? Method 1: Round robin over all the linked lists (called 'channels') continuously, looking to see if any nodes have changed to 'FILLED': void method_one() { std::vector<Data*> channel_cursors; for(ChannelList::iterator i = channel_list.begin(); i != channel_list.end(); ++i) { Data* current_item = static_cast<Data*>(i->get(segment)->tail_.get(segment)); channel_cursors.push_back(current_item); } while(true) { for(std::size_t i = 0; i < channel_list.size(); ++i) { Data* current_item = channel_cursors[i]; ACQUIRE_MEMORY_BARRIER; if(current_item->state_ == NOT_FILLED_YET) { continue; } log_latency(current_item->tv_sec_, current_item->tv_usec_); channel_cursors[i] = static_cast<Data*>(current_item->next_.get(segment)); } } } Method 1 gave very low latency when then number of channels was small. But when the number of channels grew (250K+) it became very slow because of looping over all the channels. So I tried... Method 2: Give each linked list an ID. Keep a separate 'update list' to the side. Every time one of the linked lists is updated, push its ID on to the update list. Now we just need to monitor the single update list, and check the IDs we get from it. void method_two() { std::vector<Data*> channel_cursors; for(ChannelList::iterator i = channel_list.begin(); i != channel_list.end(); ++i) { Data* current_item = static_cast<Data*>(i->get(segment)->tail_.get(segment)); channel_cursors.push_back(current_item); } UpdateID* update_cursor = static_cast<UpdateID*>(update_channel.tail_.get(segment)); while(true) { if(update_cursor->state_ == NOT_FILLED_YET) { continue; } ::uint32_t update_id = update_cursor->list_id_; Data* current_item = channel_cursors[update_id]; if(current_item->state_ == NOT_FILLED_YET) { std::cerr << "This should never print." << std::endl; // it doesn't continue; } log_latency(current_item->tv_sec_, current_item->tv_usec_); channel_cursors[update_id] = static_cast<Data*>(current_item->next_.get(segment)); update_cursor = static_cast<UpdateID*>(update_cursor->next_.get(segment)); } } Method 2 gave TERRIBLE latency. Whereas Method 1 might give under 10us latency, Method 2 would inexplicably often given 8ms latency! Using gettimeofday it appears that the change in update_cursor-state_ was very slow to propogate from the server's view to the client's (I'm on a multicore box, so I assume the delay is due to cache). So I tried a hybrid approach... Method 3: Keep the update list. But loop over all the channels continuously, and within each iteration check if the update list has updated. If it has, go with the number pushed onto it. If it hasn't, check the channel we've currently iterated to. void method_three() { std::vector<Data*> channel_cursors; for(ChannelList::iterator i = channel_list.begin(); i != channel_list.end(); ++i) { Data* current_item = static_cast<Data*>(i->get(segment)->tail_.get(segment)); channel_cursors.push_back(current_item); } UpdateID* update_cursor = static_cast<UpdateID*>(update_channel.tail_.get(segment)); while(true) { for(std::size_t i = 0; i < channel_list.size(); ++i) { std::size_t idx = i; ACQUIRE_MEMORY_BARRIER; if(update_cursor->state_ != NOT_FILLED_YET) { //std::cerr << "Found via update" << std::endl; i--; idx = update_cursor->list_id_; update_cursor = static_cast<UpdateID*>(update_cursor->next_.get(segment)); } Data* current_item = channel_cursors[idx]; ACQUIRE_MEMORY_BARRIER; if(current_item->state_ == NOT_FILLED_YET) { continue; } found_an_update = true; log_latency(current_item->tv_sec_, current_item->tv_usec_); channel_cursors[idx] = static_cast<Data*>(current_item->next_.get(segment)); } } } The latency of this method was as good as Method 1, but scaled to large numbers of channels. The problem is, I have no clue why. Just to throw a wrench in things: if I uncomment the 'found via update' part, it prints between EVERY LATENCY LOG MESSAGE. Which means things are only ever found on the update list! So I don't understand how this method can be faster than method 2. The full, compilable code (requires GCC and boost-1.41) that generates random strings as test data is at: http://pastebin.com/e3HuL0nr

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• Convert XML namespace prefixes with C#?

  - by jrista

  I have run into an exasperating problem getting a Java service client to communicate successfully with a WCF service. I have overcome many hurdles, and I believe that this is my last one. The problem boils down to how Java Axis + WSS4J seem to handle xml namespaces. The Java platform seem to be very rigid in what they expect for xml namespace prefixes, and as such, do not understand the WCF reply messages. My problem in a nutshell is as follows. I have an xml response similar to the following from my WCF service: <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" xmlns:a="http://www.w3.org/2005/08/addressing" xmlns:u="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"> <s:Header> <a:Action s:mustUnderstand="1" u:Id="_3">http://tempuri.org/IProcessor/DoProcessingResponse</a:Action> <h:CorrelationID xmlns:h="http://tempuri.org/">1234</h:CorrelationID> <a:RelatesTo u:Id="_4">uuid:40f800a0-9613-4f4a-96c5-b9fd98085deb</a:RelatesTo> <o:Security s:mustUnderstand="1" xmlns:o="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"> <!-- WS-Security header stuff --> </o:Security> </s:Header> <s:Body u:Id="_1"> <e:EncryptedData Id="_2" Type="http://www.w3.org/2001/04/xmlenc#Content" xmlns:e="http://www.w3.org/2001/04/xmlenc#"> <e:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#aes128-cbc"/> <e:CipherData> <e:CipherValue>NfA6XunmyLlT2ucA+5QneoawHm+imcaCltDAJC1mRZOSxoB6YGpDLY1FyVykPbPGDoFGUESLsmvvbD62sNnRrgE+AuKPo+1CD3DF4LfurRcEv9A50ba9V+ViqlrhydhK</e:CipherValue> </e:CipherData> </e:EncryptedData> </s:Body> </s:Envelope> This response uses simple one-character namespace prefixes for most things, such as 's' for SOAP Envelope, 'a' for WS-Addressing, 'o' for 'WS-Security', etc. The Java client, namely WSS4J, seems to expect the following: <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wsa="http://www.w3.org/2005/08/addressing" xmlns:wsu="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"> <soap:Header> <wsa:Action soap:mustUnderstand="1" wsu:Id="_3">http://tempuri.org/IProcessor/DoProcessingResponse</wsa:Action> <h:CorrelationID xmlns:h="http://tempuri.org/">1234</h:CorrelationID> <wsa:RelatesTo wsu:Id="_4">uuid:40f800a0-9613-4f4a-96c5-b9fd98085deb</a:RelatesTo> <wsse:Security soap:mustUnderstand="1" xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"> <!-- WS-Security header stuff --> </wsse:Security> </soap:Header> <soap:Body u:Id="_1"> <xenc:EncryptedData Id="_2" Type="http://www.w3.org/2001/04/xmlenc#Content" xmlns:xenc="http://www.w3.org/2001/04/xmlenc#"> <xenc:EncryptionMethod Algorithm="http://www.w3.org/2001/04/xmlenc#aes128-cbc"/> <xenc:CipherData> <xenc:CipherValue>NfA6XunmyLlT2ucA+5QneoawHm+imcaCltDAJC1mRZOSxoB6YGpDLY1FyVykPbPGDoFGUESLsmvvbD62sNnRrgE+AuKPo+1CD3DF4LfurRcEv9A50ba9V+ViqlrhydhK</xenc:CipherValue> </xenc:CipherData> </xenc:EncryptedData> </soap:Body> </soap:Envelope> Upon receipt of my response message, the Java client and WSS4J seem to want to look up elements by their own internal xml aliases, such as 'wsa' for WS-Addressing, and 'wsse' for WS-Security Extensions. Since neither of those namespaces are present in the actual response xml, exceptions are thrown. I am wondering if there is any simple way to transform an xml document from one set of namespaces to another set using C#, .NET, and the System.Xml namespace. I've poked around with XmlNamespaceManager a bit, but it does not seem to fully support what I need...or at least, I have been unable to find any really useful examples, and am not fully sure how it works. I am trying to avoid having to write some heavy-duty process to handle this manually myself, as I do not want to drastically impact the performance of our services when called by a Java Axis/WSS4J client.

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• software that meets all needs in a project

  - by taz

  Hello all, I have a got couple of software projects that I want to run with my friends(max 10 persons) privately(at least for now). But I'm kind of lost between software management systems. I am not even sure about the definitions of my needs. Dear all, what is the definition/name of the system/software that meets my needs listed below? Continuous Integration? And please suggest me a good ALL-IN-ONE instance of it: project roadmap/planning project resource(people) allocation project issue&bug tracking project mailing list project forum project wiki source control server source control client repository change notifier client build system(like scons) nightly build automation IDE integration(VS) Note: I tried Redmine and liked it, but found it kind of slow. All-in-one kind ones will be the most appreciated but if your suggestion includes more than 3 softwares, please suggest me the ones that work together painlessly. thanks in advance..

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• C# Sockets Quesion

  - by Betamoo

  In UDP client after executing: socket.SendTo(data, SendIP); Why does socket.LocalEndPoint change?

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• Setting WCF Endpoint address at runtime?

  - by james.ingham

  Hey, If I have the following: WSHttpBinding binding = new WSHttpBinding(); EndpointAddress endpoint = new EndpointAddress(new Uri("http://xxx:pppp/MyService")); MyServiceClient client = new MyServiceClient(binding, endpoint); How can I set the endpoint bindingConfiguration? If it helps my app.config is set to: <endpoint address="http://xxx:pppp/Design_Time_Addresses/WcfServiceLibrary/ManagementService/" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IManagementService" contract="ServiceReference.IManagementService"> <identity> <dns value="localhost" /> </identity> </endpoint> However I'm looking to let the user configure this before running the client. Thanks

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• Running Activex control and Maintaining security

  - by Shyju

  Hi Techies, In my a web application, I have a part to invoke an activex control .The Activex control is available in all the client PCs who are accessing my web application from web server. But When trying to run this ActiveX control from the browser in client machine (using Wshell), It was not getting invoked since "Run Activex Controls and Pluggins" are disabled in my browser. So I changed the browser settings to enable mode and Then the Activex control gave me the expected output. I afraid that this change in browser settings would allow any other website to harm my system. How could I get rid of this problem? Any thoughts? Thanks in advance

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• how to serialize / deserialize classes defined in .proto (protobuf)

  - by make

  Hi, Could someone please help me with serialization/deserialization classes defined in .proto (protobuf). here is an exp that I am trying to build: file.proto message Data{ required string x1 = 1; required uint32 x2 = 2; required float x3 = 3; } message DataExge { repeated Data data = 1; } client.cpp ... void serialize(const DataExge &data_snd){ try { ofstream ofs("DataExge"); data_snd.SerializeToOstream(&ofs); } catch(exception &e) { cerr << "serialize/exception: " << e.what() << endl; exit(1); } } void deserialize(DataExge &data_rec){ try { ifstream ifs("DataExge"); data_rec.ParseFromIstream(&ifs); } catch(exception& e) { cerr << "deserialize/exception: " << e.what() << endl; exit(1); } } int main(){ ... DataExge dataexge; Data *dat = dataexge.add_data(); char *y1 = "operation1"; uint32_t y2 = 123 ; float y3 = 3.14; // assigning data to send() dat->set_set_x1(y1); dat->set_set_x2(y2); dat->set_set_x3(y3); //sending data to the client serialize(dataexge); if (send(socket, &dataexge, sizeof(dataexge), 0) < 0) { cerr << "send() failed" ; exit(1); } //receiving data from the server deserialize(dataexge); if (recv(socket, &dataexge, sizeof(dataexge), 0) < 0) { cerr << "recv() failed"; exit(1); } //printing received data cout << dat->x1() << "\n"; cout << dat->x2() << "\n"; cout << dat->x3() << "\n"; ... } server.cpp ... void serialize(const DataExge &data_snd){ try { ofstream ofs("DataExge"); data_snd.SerializeToOstream(&ofs); } catch(exception &e) { cerr << "serialize/exception: " << e.what() << endl; exit(1); } } void deserialize(DataExge &data_rec){ try { ifstream ifs("DataExge"); data_rec.ParseFromIstream(&ifs); } catch(exception& e) { cerr << "deserialize/exception: " << e.what() << endl; exit(1); } } int main(){ ... DataExge dataexge; Data *dat = dataexge.add_data(); //receiving data from the client deserialize(dataexge); if (recv(socket, &dataexge, sizeof(dataexge), 0) < 0) { cerr << "recv() failed"; exit(1); } //printing received data cout << dat->x1() << "\n"; cout << dat->x2() << "\n"; cout << dat->x3() << "\n"; // assigning data to send() dat->set_set_x1("operation2"); dat->set_set_x2(dat->x2() + 1); dat->set_set_x3(dat->x3() + 1.1); //sending data to the client serialize(dataexge); //error// I am getting error at this line ... if (send(socket, &dataexge, sizeof(dataexge), 0) < 0) { cerr << "send() failed" ; exit(1); } ... } Thanks for your help and replies -

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• Form gets disposed somehow

  - by mnn

  I have a client-server application, in which I use classic Sockets and threads for receiving/sending data and listening for clients. The application works fine, but after some random time I get the ObjectDisposedException: System.ObjectDisposedException: Cannot access a disposed object. Object name: 'MainForm'. at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous) at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args) at System.Windows.Forms.Control.Invoke(Delegate method) That code is called from client Socket thread and I use Invoke() method to run the code on UI thread. I'm sure that I don't manually dispose the form nor using Close() (form is closed by user clicking Close button), so I don't know what could cause its disposing.

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• Ruby socket server thread question: how to send to all clients?

  - by Paul

  I'm making a TCP socket server(ruby). A thread is created for each connected client. At some point I try to send data to all connected clients. The thread aborts on exception while trying.(ruby 1.8.7) require 'socket' # I test it home right now server = TCPServer.new('localhost', 12345); while(session = server.accept) #Here is the thread being created Thread.new(session) do |s| while(msg = s.gets) #Here is the part that causes the error Thread.list.each { |aThread| if aThread != Thread.current #So what I want it to do is to echo the message from one client to all others #But for some reason it doesn't, and aborts on the following string aThread.print "#{msg}\0" end } end end Thread.abort_on_exception = true end What am I doing wrong?

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• removing diffgram from .net web service returning dataset

  - by FrenchiInLa

  per my client request I have been requested to return a dataset. basically it's an arraylist that i convert to dataset as follow DataSet ds = new DataSet(); DataTable tbl = new DataTable("Table"); DataRow drow; tbl.Columns.Add("ID", Type.GetType("System.String")); tbl.Columns.Add("Name", Type.GetType("System.String")); foreach (NameIDPair item in AL) { drow = tbl.NewRow(); drow["ID"] = item.ID; drow["Name"] = item.Name; tbl.Rows.Add(drow); } ds.Tables.Add(tbl); the problem with my client is this web service add a diffgram like diffgr:hasChanges="iserted" tag to each row, and they're pretending is not consistent with other web services used by them. How can I remove this tag in the XML returned? Any help would be greatly appreciated. Thanks

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• AJAX with Web services and ASP.NET SessionState

  - by needhelp1

  We have an application which uses ScriptManager to generate a client-side proxy which makes AJAX calls to web services. The web services being invoked live in a separate appDomain(separate cluster altogether). The problem is that our application uses a State server for storing session. I want the web services to be able to access session also. First off, does anyone see anything wrong with the client making web service calls to a separate cluster(we're hoping this would be a better approach for scalability)? I was thinking that possibly anytime there is an update to the session dictionary in one appDomain, automatically update the session in the other appDomain also(referring to the web service appDomain, don't know how to do this, only theoretical). What do others think? Thanks!

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• adding SSL to microchip Generic TCP server application

  - by Surjya Narayana Padhi

  Hi, Has anybody upgraded the code of generic tcp server application provided by Microchip to SSL? I added new listener port to existing server socket. But then also its not TCPPutIsReady state. When I tried to connect through ssh client Tera Term its asking for username and password. But does it required for client to provide username and password? I a bit new to SSL. So please let me know the steps to connect to any ssl server using Tera Term. Another doubt is that can i use a TCP server socket without using http or ftp or telnet session?

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• WCF - Dynamically Change WebResponseFormat

  - by Brandon

  Is there a way to dynamically change the WebResponseFormat on a method given a parameter passed by the client? I default my WebResponseFormat to XML, but I want to give the client the opportunity to specify a format as JSON or XML and if none is specified, default to XML. Currently I am doing the following: [WebGet(UriTemplate = "objects", BodyStyle = WebMessageBodyStyle.Bare)] [OperationContract] List<SampleObject> GetObjects(); The user can call it via: http://localhost/rest/myservice/objects They then can specify a format by doing: http://localhost/rest/myservice/objects?format=json The problem is that when I try to set the response content type via: WebOperationContext.Current.OutgoingResponse.ContentType = "application/json"; That just returns the XML but the browser attempts to process it like a JSON object instead of serializing the response as JSON. Is this even possible with .NET 3.5 outside of using a Stream as the return value and serializing the response myself? If not, is there a better solution?

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• Using comet with PHP?

  - by ryeguy

  I was thinking of implementing real time chat using a PHP backend, but I ran across this comment on a site discussing comet: My understanding is that PHP is a terrible language for Comet, because Comet requires you to keep a persistent connection open to each browser client. Using mod_php this means tying up an Apache child full-time for each client which doesn’t scale at all. The people I know doing Comet stuff are mostly using Twisted Python which is designed to handle hundreds or thousands of simultaneous connections. Is this true? Or is it something that can be configured around?

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• Java basic authorization with URLConnection

  - by zigomir

  Hello! I'm opening a connection to WebService with an URLConnection class. I also set request property for basic authorization like this: c.setRequestProperty("Authorization", "Basic " + usernameAndPasswordEncoded); Where c is an object of type URLConnection. So this is client side of WebService call. Now on server side I need to get username from session: User user = (User) request.getSession().getAttribute("user"); But this won't get an username. Also if I look through debug mode, I see an anonymous userName in HttpSession object. What to do to solve this problem, so that username is sent through client to WebService server for authorization? Thanks everyone!

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• Dangers of Windows API and Administrator accounts?

  - by Brett Powell

  I wrote a game server plugin last night that allowed me to create a user account and set it as administrator, which is a huge problem. Of course the simple fix is to create a basic user account with limited privileges for the game servers, so they would not have access to do things like this. I wanted to find out if there's anything else in the Windows API that would create such a huge vulnerability though? I guess I want to just make sure that when the client's game servers accounts are moved to limited access accounts, we won't have to worry about any of them using the windows API to sabotage the machines. There is already enough exploits in the game itself to worry about, without having to worry about client's taking over the machines with plugins lol. Some of the questions relative would be... Can you disable/enable Remote Desktop from c++? Can you get a list of AD user groups from c++? (not that a user belongs to, but a complete list)

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• Web Service URL change is not recognized

  - by ila

  I deployed in a production environment a .net solution that consumes a web service added as "Service reference" in visual studio. Today the endpoint URL has changed, and I modified that URL in web.config. But when I run the solution I get the error: System.ServiceModel.FaultException: Server did not recognize the value of HTTP Header SOAPAction: http://93.62.150.200/LogEvent. Now that sound strange to me. As you can see, the IP is 93.62.... but the new value is different. The web.config entry (with the new value or the URL) is: <client> <endpoint address="http://213.92.50.215/sawfc/WS_SAWFC_Int.asmx" binding="basicHttpBinding" bindingConfiguration="wsSAWFCInterfaceSoap" contract="it.datasphere.ws.wsSAWFCInterfaceSoap" name="wsSAWFCInterfaceSoap" /> </client> I cannot reach the new web service from dev environment, so I cannot modify the Service reference there. Any idea? Thanks a lot!

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• Cloud e-mail and portal integration: experiences?

  - by Mark McLaren

  I am evaluating cloud e-mail solutions based upon: Google Apps for Education Microsoft Live@edu I work for a University and we currently have an institutional portal (based on uPortal). We currently have our local IMAP server and webmail client fully integrated with the portal. We would like to replicate the current portal e-mail experience with the new e-mail services. At present users can see a snapshot of their inbox in the portal and click through into the appropriate place in the webmail client. We expect that we need to solve similar problems when integrating with the cloud based e-mail solutions. We need to solve the single sign-on (SSO) problem. We need to be able to access the inbox messages on the users behalf. (e.g. proxy authentication) Does anybody have an experience or advice on this? Many thanks, Mark

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• Is it possible to write C# code as below and send email using network in different country?

  - by kedar karthik

  Is it possible to write C# code as below and send email using mnetwork in different country? MSExchangeWebServiceURL = mail.something.com/ews/exchange.asmx It's a web service URL. This works great when I run the same code from home network, my friends home network anywhere around, but when I run it from my client's location in Columbia it fails. I have a valid user name and password on that Exchange Server. Is there any configuration that I can set to achieve this? BTW this code below works when I run it within office network and any network within any home network. I have tried it at least with five friends network in Plano, Texas. I want this code to work running from any network in another country. My client in Columbia can connect to the web service using a browser using the same user name and password, but when I run the code above it is not able to connect to our web service.

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• Java graph plotting library

  - by Nuwan

  I have to draw a line graph for some inputs (x/y), what is the best java client library for graph plotting

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• How do we read the data from a public google spreadsheet using Zend_Gdata

  - by bobo

  I have read the examples here: http://framework.zend.com/manual/en/zend.gdata.spreadsheets.html But those examples assume the spreadsheet to be read needs authentication: $service = Zend_Gdata_Spreadsheets::AUTH_SERVICE_NAME; $client = Zend_Gdata_ClientLogin::getHttpClient($user, $pass, $service); $spreadsheetService = new Zend_Gdata_Spreadsheets($client); $feed = $spreadsheetService->getSpreadsheetFeed(); The spreadsheet I am going to read from is a public one, so I don't really need to provide any authentication right? And what I need to provide is just the url of the spreadsheet. I tried to read the class description here but still have no idea how it can be done: http://framework.zend.com/apidoc/core/Zend_Gdata/Spreadsheets/Zend_Gdata_Spreadsheets.html

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• Listeners when using hylafax from Java

  - by DaDaDom

  I am trying to send a fax to a hylafax server via Java: Client faxClient = new HylaFAXClient(); faxClient.open(...); faxClient.user(...); faxClient.pass(...); Job j = faxClient.createJob(); job.setStuff(...); job.setNotifyType(Job.NOTIFY_ALL); faxClient.addTransferListener(new FaxTransferListener()); faxClient.addConnectionListiener(new FaxConnectionListener()); faxClient.submit(job); The problem is that I don't get any notifications on any of the listener methods. When I watch the queues on the hylafax server, e.g. via JHylaFax, the job failed, but how can I react to that event programatically on client side without having to poll the job queues regularly?

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• GAE Entity Groups/Transaction

  - by bach

  Hi, Say you have a Client Buying Card object and a product object. When the client chooses the buy opition you create the object and then add a product. It should be transactional but it's not on the same entity group as the product and the card already been persisted, isn't it? Is there any way to overcome this simple scenario safely and easily? here's a code sample: Transaction tx = pm.currentTransaction(); tx.begin(); Product prod = pm.getObjectById(Product.class, "TV"); prod.setReserved(true); pm.makePersistent(prod); Card card = pm.getObjectById(Card.class, "user123"); /// <--- will thorw an exception as card and prod aren't on the same entity group card.setProd(prod); pm.makePersistent(card); try { tx.commit(); break; }

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• Reviving a deleted file for use in my workspace

  - by John Cowan

  Greetings We run perforce with several users. Each user has their own development website that shows files in their workspace. This is great for making and viewing changes to webpages before submitting them. Sometime ago, we deleted a few pages in Perforce. I would like to revive these pages, but not to make them visible on our live site. I want to view them in my workspace and on my dev site, but I do want to push them out to our live server. In the "depot" tab of my P4 client, I can see the deleted files. I cannot see them in the "Workspace" tab of my client. How can I revive them for use in my Workspace, but not make them live to the world? I'm not a P4 admin so I could use a little guidance. Thanks for any help,

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