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  • In node.js slow readable stream attached to a faster pushing message queue eats up memory

    - by Vishal
    In my node.js program I have a response stream attached to a message queue (zeromq) delivering data at a very high rate. Due to slow network connection the response stream and its underlying implementation is unable to consume data at that pace thus occupying a lot of memory. Do you have any suggestion to solve this problem. For reference please see the code snippet below: zmq.on("message", function(data) { res.write(data); // End response on some event });

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  • Applet networking patterns

    - by Kristoffersen
    Hi SO. I have an applet that connects to a server, it receives some commands and based on that it haves to draw (or move) different things. Which patterns should I use? I assume that the network connection and applet should run in two different threads? Thanks, Kristoffer

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  • image with external interface

    - by Leo
    I need to send a picture to flash with external interface (as3)... can not be an url because don't have connection... I'm trying open the image file and send to flash like text but without success any idea?

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  • How to connect to local database via website?

    - by Carlo
    Hi I have a website used by clients for reporting purposes and would like to give clients the option of my website reading their local database directly (instead of them providing data in a file format). In most instances their database would be SQL Express setup on their localhost. How can I connect to a clients local SQL server via my website, using asp.net / javascript etc? If the client provides their connection string properties, localhost would just refer to my server's localhost... Thanks

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  • Network Differences

    - by Chris
    I am busy working on a java app to run on blackberries but on some devices i am testing on, the code does not seem to be working and im having a hard time pinpointing where the problem lies. My question is: Could the problem with some phones working and not working have t odo with the type of network they are running on such GSM vs CDMA and would the code that stops working on some devices be in one of the following areas: 1) Listeners - such as MessageListener and Phone Listener 2) UI Objects - simple test labels and buttons 3) Connection to a web service using ksoap2

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  • implementation of TCP/IP for java-me

    - by iamrohitbanga
    java-me uses the internet connection of the mobile device to implement network api's. are there any special features in the implementation of tcp/ip protocol stack for mobile devices or the implementation is essentially the same with a little different parameters like buffer space etc. lets take symbian for example.

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  • failed to load external entity error on SOAP

    - by hd
    i am call a web service which is locate on https protocol. and i get "failed to load external entity" error while calling it. as i search on google it is because in PHP5, SOAP class will not parse WSDL file located on a secure HTTPS connection. what is the solution? i don't want to use http instead of https.

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  • Wake up thread blocked on accept() call

    - by selbie
    Sockets on Linux question I have a worker thread that is blocked on an accept() call. It simply waits for an incoming network connection, handles it, and then returns to listening for the next connection. When it is time for the program to exit, how do I signal this network worker thread (from the main thread) to return from the accept() call while still being able to gracefully exit its loop and handle it's cleanup code. Some things I tried: 1. pthread_kill to send a signal. Feels kludgy to do this, plus it doesn't reliably allow the thread to do it's shutdown logic. Also makes the program terminate as well. I'd like to avoid signals if at all possible. pthread_cancel. Same as above. It's a harsh kill on the thread. That, and the thread may be doing something else. Closing the listen socket from the main thread in order to make accept() abort. This doesn't reliably work. Some constraints: If the solution involves making the listen socket non-blocking, that is fine. But I don't want to accept a solution that involves the thread waking up via a select call every few seconds to check the exit condition. The thread condition to exit may not be tied to the process exiting. Essentially, the logic I am going for looks like this. void* WorkerThread(void* args) { DoSomeImportantInitialization(); // initialize listen socket and some thread specific stuff while (HasExitConditionBeenSet()==false) { listensize = sizeof(listenaddr); int sock = accept(listensocket, &listenaddr, &listensize); // check if exit condition has been set using thread safe semantics if (HasExitConditionBeenSet()) { break; } if (sock < 0) { printf("accept returned %d (errno==%d)\n", sock, errno); } else { HandleNewNetworkCondition(sock, &listenaddr); } } DoSomeImportantCleanup(); // close listen socket, close connections, cleanup etc.. return NULL; } void SignalHandler(int sig) { printf("Caught CTRL-C\n"); } void NotifyWorkerThreadToExit(pthread_t thread_handle) { // signal thread to exit } int main() { void* ptr_ret= NULL; pthread_t workerthread_handle = 0; pthread_create(&workerthread, NULL, WorkerThread, NULL); signal(SIGINT, SignalHandler); sleep((unsigned int)-1); // sleep until the user hits ctrl-c printf("Returned from sleep call...\n"); SetThreadExitCondition(); // sets global variable with barrier that worker thread checks on // this is the function I'm stalled on writing NotifyWorkerThreadToExit(workerthread_handle); // wait for thread to exit cleanly pthread_join(workerthread_handle, &ptr_ret); DoProcessCleanupStuff(); }

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  • Problems with starting windows service on windows xp SP3

    - by Michiel Peeters
    I'm currently facing a problem which I can not resolve and I really don't know what to do anymore. When I'm trying to start the service I receive the message: "The service is started but again also stopped, this because that some of the services will stop if they have nothing to do, for example the performance logs and the alerts service". I've looked into the Windows Logs but nothing is written there which could describe why my service is all the time stopping. I've also tried to fire the windows service via the command prompt which gives me the message: "The service is not started, but the service didn't return any faults.". I've tried to remove all keys which references to my service, which didn't resolve the issue. I've searched on google (maybe not good enough) to find an answer but I didn't found any. I did found some websites which describes what I could do, but all of these suggestions didn't work. This is kinda ** because I do not know where to look. I do not have any error message, i do not have any id which i can use to search on. I really don't know where to start and I hope you guys can help me on this one. Detailed explanation about the windows service OS: Windows XP SP3 .Net Framework: .Net 4.0 Client Profile Language: C# Development environment: Visual Studio 2010 Professional (but Visual Studio 2012 RC is installed) Communications: WCF (Named Pipes), WCF (BasicHTTPBinding) Named Pipes: I have chosen for this solution because I wanted to communicate from a windows service to a windows form application. It worked now for quite some time but suddenly my windows service shuts it self down and I couldn't restart it anymore. There are two named pipes services implemented: An event service which will send any notification to the windows form application and an management service which gives my windows form application the possibility to maintain my windows service. BasicHTTPBinding: The basic http binding makes the connection to a central server. This connection is then used for streaming information from the client to the server. I do not know which additional information you will need, but if you guys need something then I'll try to give it as detailed as possible. Thank you in advance.

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  • Using database on another development machine

    - by Cipher
    Hi, I am developing an ASP.NET website. I wanted to shift whole of my work to another PC of mine. I copied the website to the other PCOpenCreate ASP.NET folderApp_Data and pasted the database.mdf and database.ldf files there. I was getting some exception when I was trying to run the website as it showed the "could not open the connection from con.open()". Is there some other step too that I am missing?

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  • Escapeing values in PDO statements

    - by Pardoner
    Doesn't prepare() escape any quotes(') in a PDO statement? For some reason when I do this: $sql = "INSERT INTO sessions (id, name) VALUES (1,'O'brian')"; $query = $this->connection->prepare($sql); $query->execute(); I get this error: Could not insert record SQLSTATE[42000]: [Microsoft][SQL Server Native Client 10.0][SQL Server]Incorrect syntax near 'brian'. How could this be if I'm using prepare()?

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  • Making a Wrapper class for ActiveMQ

    - by DarthVader
    I want to make a Wrapper class for ActiveMQ which will have only send and get functions. I want to wrap them in a static class. Users can use this client and send, get messages to the activemq instance. I want this process to be transparent. There are two classes in this link My only handicap is, i need to this in c++ and not sure where to start. I havent used c++ for ages and now not sure how I can create this wrapper class. I m giving it a try as follows: // .h file #include <stdlib.h> #include <iostream> using namespace std; class ActiveMQWrapper { public: static void send(std::string message); static std::string get(); }; // .cpp file #include<string> #include<iostream> #include "ActiveMQWrapper.h" void ActiveMQWrapper::send(std::string message){ std::cout<<message; } std::string ActiveMQWrapper::get(){ return "test"; } // test file #include <string> #include <iostream> #include "ActiveMQWrapper.h" int main() { std::string foo ="test"; ActiveMQWrapper::send(foo); std::cout<<ActiveMQWrapper::get(); return 1; } When I added the following to .h file, hell breaks loose. Do you think I should seperate this impl to a factory and initialize and instance and return to the wrapper above? How do i deal with all the dependencies? private: Connection* connection; Session* session; Destination* destination; MessageProducer* producer; int numMessages; bool useTopic; bool sessionTransacted; std::string brokerURI; and the header files, i get several messages as errors, which complains about the path. How can i get this correct? I eventually want to build a Factory, get an instance and send or get the messages to the queue. is there a code sample i can look into to get this right? essential i want to use the functionality of only this producer and consumer. Edit: I understand there is no such thing as static class in C++ . This is my reference.

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  • pass commands to an running R-Runtime

    - by tiny81
    Hi, is there a way to pass commands (from a shell) to an all ready running R-runtime/R-Gui, without copy&past. So far I only know how to call R via shell with the -f or -e option, but in both cases a new R-Runtime will process the R-Script or R-Command I passed to it. I rather would like to have an open R-Runtime waiting for commands passed to it (via what ever connection is possible). regrads, Tiny

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  • Problem with index server talking to remote server names with dashes or dots in them

    - by Aim Kai
    Hi I am having a problem, accessing a remote index server catalog. The name of the server has - in it, so i put the index catalog name as: i.e num.num.num.num\name of catalog or an-example-server I get the following error when using an ole data connection to pull results from the index: "Format of the initialization string does not conform to specification starting at index 39" I tried putting single quotes and &qoute; with no luck - anyone have idea? PS. This Microsoft Index Server Question!

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  • onclose and onerror not getting called on DataChannel disconnect

    - by Will
    I have a wall application using WebRTC DataChannels. In the code I've managed to work out the connection, but I'm not getting notified when a peer disconnects. On the channels I have the following listeners: channels[uid].onerror = function( event ) { console.log( 'channels[uid].onerror', uid, arguments ) removePeer( uid ) } channels[uid].onclose = function() { console.log( 'channels[uid].onclose', uid, arguments ) removePeer( uid ) } When I reload tabs disconnecting peers, I don't get close messages. When I send to them, I don't get an error.

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  • Killing a thread while deleting an object

    - by viswanathan
    I have an application which does some socket communication with some hardwares. Assume for the particular hardware i have an object and this object intiates a thread which listens on a particular port number say 5001 infinitely until a connection is established. Now if i delete this obect is there anyway by which i can ensure that the thread that is listening on port number 5001 infinitely also gets destroyed.

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