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  • Fastest reliable way for Clojure (Java) and Ruby apps to communicate

    - by jkndrkn
    Hi There, We have cloud-hosted (RackSpace cloud) Ruby and Java apps that will interact as follows: Ruby app sends a request to Java app. Request consists of map structure containing strings, integers, other maps, and lists (analogous to JSON). Java app analyzes data and sends reply to Ruby App. We are interested in evaluating both messaging formats (JSON, Buffer Protocols, Thrift, etc.) as well as message transmission channels/techniques (sockets, message queues, RPC, REST, SOAP, etc.) Our criteria: Short round-trip time. Low round-trip-time standard deviation. (We understand that garbage collection pauses and network usage spikes can affect this value). High availability. Scalability (we may want to have multiple instances of Ruby and Java app exchanging point-to-point messages in the future). Ease of debugging and profiling. Good documentation and community support. Bonus points for Clojure support. What combination of message format and transmission method would you recommend? Why? I've gathered here some materials we have already collected for review: Comparison of various java serialization options Comparison of Thrift and Protocol Buffers (old) Comparison of various data interchange formats Comparison of Thrift and Protocol Buffers Fallacies of Protocol Buffers RPC features Discussion of RPC in the context of AMQP (Message-Queueing) Comparison of RPC and message-passing in distributed systems (pdf) Criticism of RPC from perspective of message-passing fan Overview of Avro from Ruby programmer perspective

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  • How do I use the Messaging app with an account different from my primary Microsoft account?

    - by Bob
    I set up this computer with a Local account. I have linked it to my 'primary' Microsoft account - which is used in the Mail and Store apps. There are no other accounts linked at this time. I wish to use the Messaging app with a different Microsoft account. However, Add an account only lets me add a Facebook account! I don't want to remove or change my primary Microsoft account, since I do not wish to use the Messaging account with any other services.

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  • How to implement instant communication between iPad and iPhone through the net?

    - by Alexandergre
    What is the best way to implement this: 1.iphone/webBrowser user selects some products (a,b,c) to buy 2.the chosen products most appear on the iPad located in the Store. using a UITableView perhaps. 3.The store staff then decide if the products are available in 10, 20 or 30 minutes for pick up. 4.When the store staff chose the time(10,20,30 minutes) it must appear/communicate back to the users web browser or iPhone. 5.buyer comes to the store to pick up the products he buyed! Im not really good in this kind of communication stuff! I need help! what is the best way to implement this? are there external api/plugin I could use? I already have an ftp server. I can do all the graphics and User interactions. the only problem for is the communication between the devices? Thanks for help.

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  • Notification framework for java

    - by rmarimon
    I'm in the process of developing a web application (java + jsp) that can send notifications to users. The user can subscribe to multiple events generated by the application and can choose to receive the messages associated with those events via multiple channels (email, sms, growl?, messenger); perhaps different messages through different channels; perhaps a daily message digest. Everything must be configurable by the user. Is there some framework that deals with this?

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  • Rails Message This User Button

    - by bob
    Hello, I am using this http://github.com/professionalnerd/simple-private-messages plugin in rails and I am on a user page show.html.erb - User and I want to put a button there that, when clicked, goes to the current user's inbox and populates the field call "send to" with the "user" name. How do I send that data along when the button is clicked? <%= link_to image_tag('send_message_button.jpg', :title => 'send #{user} a message', :alt => 'send #{user} a message'), new_user_message_path(current_user), :class=>'messageuser' %> This goes to the current_user's inbox. I want to send the "params[:user_id]" variable along with it so that I can then fill out the "send to" textbox in the inbox page with it. How do I send that params variable along with this button?

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  • How to configure MessageEndpointMapping by namespace in NServiceBus

    - by SteveBering
    I am trying to configure my message endpoint mapping in my NServiceBus configuration by sending messages from different namespaces to different endpoints. As such, I have configured the following in my web.config: However, when my application starts, I receive the following exception: Spring.Objects.PropertyAccessExceptionsException: PropertyAccessExceptionsException (1 errors); nested PropertyAccessExceptions are: [Spring.Core.TypeMismatchException: Cannot convert property value of type [System.Collections.Hashtable] to required type [System.Collections.IDictionary] for property 'MessageOwners'., Inner Exception: System.ArgumentException: Problem loading message assembly: Company.Messages.Payments --- System.IO.FileNotFoundException: Could not load file or assembly 'Company.Messages.Payments' or one of its dependencies. The system cannot find the file specified. File name: 'Company.Messages.Payments' What I find interesting is that it seems to have found Company.Messages.Accounts but failed on the second configured line. I thought that maybe it didn't like have them all go to the same endpoint, but changing this configuration to have them go different endpoints didn't change the error message I received. What am I doing wrong? Is it not possible to segment messages by namespace (all I have seen is by type and by assembly)? Thanks, Steve

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  • Mule xml to soap problem

    - by kevfuzz
    Hi, I'm not sure if there many Mule users on here but I'm hoping someone might be able to help me! I'm having a problem calling a webservice from Mule using Axis. I've created a fairly simple example where I have xml in a file being read by Mule, it's then transformed into a Document and sent to the webservice. The relevant code in the mule config looks like this: <inbound> <file:inbound-endpoint path="./files/initial" transformer-refs="FileToString xmlToDom" connector-ref="fileConnector" /> </inbound> <outbound> <pass-through-router> <axis:outbound-endpoint address="http://localhost:8081/holidayService?method=echoXXXX" synchronous="true" style="DOCUMENT" use="LITERAL" /> </pass-through-router> </outbound> However the call for the webservice fails as the above config is generating a SOAP message with an tag just after the tag and closes it just before the tag. The generated SOAP message looks like this: POST /holidayService?method=echoXXXX HTTP/1.1 Content-Type: text/xml X-MULE_ENDPOINT: http://localhost:8081/holidayService?method=echoXXXX SOAPAction: http://localhost:8081/holidayService?method=echoXXXX directory: D:\bea\weblogic92\samples\domains\wl_server\files\processed filename: HolidayRequest.xml method: echoXXXX originalFilename: HolidayRequest.xml style: document use: literal User-Agent: Jakarta Commons-HttpClient/3.1 Host: 127.0.0.1:8081 Content-Length: 1183 <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <soapenv:Header> <mule:header soapenv:actor="http://www.muleumo.org/providers/soap/1.0" soapenv:mustUnderstand="0" xmlns:mule="http://www.muleumo.org/providers/soap/1.0"> <mule:MULE_CORRELATION_ID>D:\bea\weblogic92\samples\domains\wl_server\files\processed\HolidayRequest.xml</mule:MULE_CORRELATION_ID> <mule:MULE_CORRELATION_GROUP_SIZE>-1</mule:MULE_CORRELATION_GROUP_SIZE> <mule:MULE_CORRELATION_SEQUENCE>-1</mule:MULE_CORRELATION_SEQUENCE> </mule:header> </soapenv:Header> <soapenv:Body> <value0 xsi:type="ns1:DocumentImpl" xmlns="" xmlns:ns1="http://dom.internal.xerces.apache.org.sun.com"> <sch:HolidayRequest xmlns:sch="http://mycompany.com/hr/schemas"> <sch:Holiday> <sch:StartDate>2009-08-13</sch:StartDate> <sch:EndDate>1988-12-12</sch:EndDate> </sch:Holiday> <sch:Employee> <sch:Number>3434</sch:Number> <sch:FirstName>John</sch:FirstName> <sch:LastName>Smith</sch:LastName> </sch:Employee> </sch:HolidayRequest> </value0> </soapenv:Body> </soapenv:Envelope> The webservice works fine in SOAPUI without the tag and from what I've read on the Mule website I don't know why it's being inserted. Any help would be much appreciated, Kevin.

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  • Does RabbitMq do round-robin from the exchange to the queues

    - by Lancelot
    Hi, I am currently evaluating message queue systems and RabbitMq seems like a good candidate, so I'm digging a little more into it. To give a little context I'm looking to have something like one exchange load balancing the message publishing to multiple queues. I don't want to replicate the messages, so a fanout exchange is not an option. Also the reason I'm thinking of having multiple queues vs one queue handling the round-robin w/ the consumers, is that I don't want our single point of failure to be at the queue level. Sounds like I could add some logic on the publisher side to simulate that behavior by editing the routing key and having the appropriate bindings in place. But that's kind of a passive approach that wouldn't take the pace of the message consumption on each queue into account, potentially leading to fill up one queue if the consumer applications for that queue are dead. I was looking for a more pro-active way from the exchange entity side, that would decide where to send the next message based on each queue size or something of that nature. I read about Alice and the available RESTful APIs but that seems kind of a heavy duty solution to implement fast routing decisions. Anyone knows if round-robin between the exchange the queues is feasible w/ RabbitMQ then? Thanks.

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  • PostMessage tutorial

    - by bdhar
    Hi I am looking for some tutorial regarding the PostMessage functionality in Windows SDK. I have been googling a while but no luck. Is there a site which elaborates on this operation? Thanks.

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  • What happens when I subscribe to a message using NServiceBus?

    - by Ben Aston
    When I subscribe as the recipient of a certain type of message using NServiceBus Bus.Subscribe<MyMessage>() What am I actually doing? Am I specifying that a particular method on the recipient type will be invoked upon message receipt? If so, within what context does the method run - in a static context, or within the context of a new'd-up parent class instance (and if so, how does NServiceBus know what constructor to use)?

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  • API to determine cell carrier?

    - by Chris Lively
    Is there a free API or some other way to determine what carrier a cell phone number is registered with? I'd like my application to broadcast text messages without them picking their carrier from a list. UPDATE: Interestingly, a coworker found the answer: http://developer.whitepages.com/ UPDATE2: Well the whitepages license agreement is so restrictive that you can't build an app for it. Any other ideas?

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  • How to simulate mousemove event from one window to another?

    - by Gohan
    Hello, I am trying to Create an empty window, which process the WM_MOUSEMOVE message in WinProc: case WM_MOUSEMOVE: { HWND otherHwnd = HWND(0x000608FC); POINT pt = {LOWORD(lParam), HIWORD(lParam)}; ClientToScreen(otherHwnd, &pt); PostMessage(otherHwnd, WM_TIMER, WPARAM(4096), 0); PostMessage(otherHwnd, message, wParam, lParam); SendMessage(otherHwnd, WM_NCHITTEST, NULL, (LPARAM)MAKELONG(pt.x, pt.y)); SendMessage(otherHwnd, WM_NCHITTEST, NULL, (LPARAM)MAKELONG(pt.x, pt.y)); SendMessage(otherHwnd, WM_NCHITTEST, NULL, (LPARAM)MAKELONG(pt.x, pt.y)); SendMessage(otherHwnd, WM_SETCURSOR, WPARAM(otherHwnd), (LPARAM)MAKELONG(HTCLIENT, WM_MOUSEMOVE)); break; } I hope I can hover the hyberlink in IE, but result is the hyberlink only be showed as hover style in a very short time, then it turn to normal, and then again hover, then normal. At www.amazon.com, when I simulate to hover the link("Today's Deals ") , the link is blinking. I think there is a better way to do it, even the IE window is covered with some other windows, it can make the IE act with the mouseevent. waiting for the best solution~ orz Above is the spy++ logs when I realy hover the link. and the simulate is as same as the real message <01277> 000608FC S WM_SETCURSOR hwnd:000608FC nHittest:HTCLIENT wMouseMsg:WM_MOUSEMOVE <01278> 000608FC R WM_SETCURSOR fHaltProcessing:False <01279> 000608FC P WM_MOUSEMOVE fwKeys:0000 xPos:406 yPos:50 <01280> 000608FC P WM_TIMER wTimerID:4096 tmprc:00000000 <01281> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01282> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01283> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01284> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01285> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01286> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01287> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01288> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01289> 000608FC S WM_SETCURSOR hwnd:000608FC nHittest:HTCLIENT wMouseMsg:WM_MOUSEMOVE <01290> 000608FC R WM_SETCURSOR fHaltProcessing:False <01291> 000608FC P WM_MOUSEMOVE fwKeys:0000 xPos:406 yPos:50 <01292> 000608FC P WM_TIMER wTimerID:4096 tmprc:00000000 <01293> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01294> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01295> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01296> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01297> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01298> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01299> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01300> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01301> 000608FC S WM_SETCURSOR hwnd:000608FC nHittest:HTCLIENT wMouseMsg:WM_MOUSEMOVE <01302> 000608FC R WM_SETCURSOR fHaltProcessing:False <01303> 000608FC P WM_MOUSEMOVE fwKeys:0000 xPos:406 yPos:50 <01304> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01305> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01306> 000608FC P WM_TIMER wTimerID:4096 tmprc:00000000 <01307> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01308> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01309> 000608FC S WM_NCHITTEST xPos:520 yPos:283 <01310> 000608FC R WM_NCHITTEST nHittest:HTCLIENT <01311> 000608FC S WM_NCHITTEST xPos:521 yPos:281 <01312> 000608FC R WM_NCHITTEST nHittest:HTCLIENT

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  • whats wrong with the following code

    - by giri
    Hi i am trying to send sms to my mobile using java.When I run the application I am getting the the follwing error. package HelloWorld; import java.io.*; import java.util.BitSet; import javax.comm.*; import java.lang.*; public class SerialToGsm { InputStream in; OutputStream out; String lastIndexRead; String senderNum; String smsMsg; SerialToGsm(String porta) { try { // CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier("serial0"); CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier(porta); SerialPort sp = (SerialPort)portId.open("Sms_GSM", 0); sp.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); sp.setFlowControlMode(sp.FLOWCONTROL_NONE); in = sp.getInputStream(); out = sp.getOutputStream(); // modem reset sendAndRecv("+++AT", 30); // delay for 20 sec/10 sendAndRecv("AT&F", 30); sendAndRecv("ATE0", 30); // echo off sendAndRecv("AT +CMEE=1", 30); // verbose error messages sendAndRecv("AT+CMGF=0", 70); // set pdu mode // sendAndRecv("AT V1E0S0=0&D2&C1", 1000000); } catch (Exception e) { System.out.println("Exception " + e); System.exit(1); } } private String sendAndRecv(String s, int timeout) { try { // clean serial port input buffer in.skip(in.available()); System.out.println("=> " + s); s = s + "\r"; // add CR out.write(s.getBytes()); out.flush(); String strIn = new String(); for (int i = 0; i < timeout; i++){ int numChars = in.available(); if (numChars > 0) { byte[] bb = new byte[numChars]; in.read(bb,0,numChars); strIn += new String(bb); } // start exit conditions // --------------------- if (strIn.indexOf(">\r\n") != -1) { break; } if (strIn.indexOf("OK\r\n") != -1){ break; } if (strIn.indexOf("ERROR") != -1) { // if find 'error' wait for CR+LF if (strIn.indexOf("\r\n",strIn.indexOf("ERROR") + 1) != -1) { break; } } Thread.sleep(100); // delay 1/10 sec } System.out.println("<= " + strIn); if (strIn.length() == 0) { return "ERROR: len 0"; } return strIn; } catch (Exception e) { System.out.println("send e recv Exception " + e); return "ERROR: send e recv Exception"; } } public String sendSms (String numToSend, String whatToSend) { ComputSmsData sms = new ComputSmsData(); sms.setAsciiTxt(whatToSend); sms.setTelNum(numToSend); // sms.setSMSCTelNum("+393359609600"); // SC fixed String s = new String(); s = sendAndRecv("AT+CMGS=" + (sms.getCompletePduData().length() / 2) + "\r", 30); // System.out.println("==> AT+CMGS=" + (sms.getCompletePduData().length() / 2)); // System.out.println("<== " + s); if (s.indexOf(">") != -1) { // s = sendAndRecv(sms.getSMSCPduData() + sms.getCompletePduData() + "\u001A"); // usefull one day? // System.out.println("Inviero questo >>>> " + sms.getCompletePduData()); // if this sintax won't work try remove 00 prefix s = sendAndRecv("00" + sms.getCompletePduData() + "\u001A", 150); // System.out.println("<== " + s); return s; } else { return "ERROR"; } } // used to reset message data private void resetGsmObj() { lastIndexRead = null; senderNum = null; smsMsg = null; } public String checkSms (){ String str = new String(); String strGsm = new String(); strGsm = sendAndRecv("AT+CMGL=0", 30); // list unread msg and sign them as read // if answer contain ERROR then ERROR if (strGsm.indexOf("ERROR") != -1) { resetGsmObj(); return strGsm; // error } strGsm = sendAndRecv("AT+CMGL=1", 30); // list read msg // if answer contain ERROR then ERROR if (strGsm.indexOf("ERROR") != -1) { resetGsmObj(); return strGsm; // error } // evaluate message index if (strGsm.indexOf(':') <= 0) { resetGsmObj(); return ("ERROR unexpected answer"); } str = strGsm.substring(strGsm.indexOf(':') + 1,strGsm.indexOf(',')); str = str.trim(); // remove white spaces // System.out.println("Index: " + str); lastIndexRead = str; // find message string // ------------------- // look for start point (search \r, then skip \n, add and one more for right char int startPoint = strGsm.indexOf("\r",(strGsm.indexOf(":") + 1)) + 2; int endPoint = strGsm.indexOf("\r",startPoint + 1); if (endPoint == -1) { // only one message endPoint = strGsm.length(); } // extract string str = strGsm.substring(startPoint, endPoint); System.out.println("String to be decoded :" + str); ComputSmsData sms = new ComputSmsData(); sms.setRcvdPdu(str); // SMSCNum = new String(sms.getRcvdPduSMSC()); senderNum = new String(sms.getRcvdSenderNumber()); smsMsg = new String(sms.getRcvdPduTxt()); System.out.println("SMSC number: " + sms.getRcvdPduSMSC()); System.out.println("Sender number: " + sms.getRcvdSenderNumber()); System.out.println("Message: " + sms.getRcvdPduTxt()); return "OK"; } public String readSmsSender() { return senderNum; } public String readSms() { return smsMsg; } public String delSms() { if (lastIndexRead != "") { return sendAndRecv("AT+CMGD=" + lastIndexRead, 30); } return ("ERROR"); } } ERROR: Error loading SolarisSerial: java.lang.UnsatisfiedLinkError: no SolarisSerialParallel in java.library.path Caught java.lang.UnsatisfiedLinkError: com.sun.comm.SolarisDriver.readRegistrySerial(Ljava/util/Vector;Ljava/lang/String;)I while loading driver com.sun.comm.SolarisDriver Exception javax.comm.NoSuchPortException

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  • TIBRV: Remote vs Local RVD

    - by jsw
    When connected to a local RVD a sending application is shielded from network interruptions and the send message methods will only block for the time it takes for the message to reach the local RVD process. With remote RVD the sending application is no longer shielded from network interruptions and the send message methods will block for the time it takes to hop across the network to reach the remote RVD process. Is my understanding correct? The documentation is vague regarding remote daemons. I'm mostly concerned with how reliable and performant the send message will be from the perspective of a sending application. Introducing unnecessary blocking on the client side due to sending a message (especially a network hop) is a big no-no in this application. The speed at which the messages reach the consumer is not of the utmost importance. With this in mind is a remote RVD out of the question?

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  • Is there any way, short of "copy and paste inheritence" to share a .net class with a Silverlight app

    - by Jekke
    I have a project in two parts: a Silverlight front end and a WCF duplex service. Ideally, I would like to pass a message of a custom type (call it TradeOffer) from the WCF service to be consumed by the Silverlight application. When I try to, I get an error that indicates I can't pass an object of an unknown type across the wire like that and that, maybe, I could do so if I used the InternalsVisibleTo attribute on the server component. I'm not sure if that would work in this environment and know it would be messy in development. I originally put the message definition in a library to be used by both the service and the client, but couldn't add a reference to the library from the Silverlight client (because it's not a Silverlight assembly.) Is there some way I can access the definition of a message class from both the Silverlight client that consumes it and the service that publishes it without using the InternalsVisibleTo attribute or should I write the application another way?

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  • JbossESB jmsProvider cannot convert IBMMQ JMS Message JMSTextMessage

    - by Himanshu
    I am trying to integrate IBMMQ v6.0.2 with jbossESB. we have local Queue available on IBMMQ on one of our QA QUEUEMANAGER. I am able to listen to the QUEUE using JMSprovider of jboss ESB. As soon as a message (of type jms_text ) is dropped , esb listen to it and pick it up and before it hit the next action it throws following error message. ERROR [JmsComposer] Unsupported JMS message type: com.ibm.jms.JMSTextMessage Here are the steps I followed. jboss-service.mxl : Defined Connection Factory and QUEUE added jars ( com.ibm.mq.* ) to ${jbossesb}/server/${mynode}/lib Added jms lsinterner configuration on jboss-esb.xml Please guide me what I m missing here... Do I need to create custom MessagePlugin ? jboss-esb looks like this <jms-provider name="WSMQ" connection-factory="MQQueueConnectionFactory"> <jms-bus busid="queuestartGwChannel"> <jms-message-filter dest-type="QUEUE" dest-name="wsmq/SerivceOrderQueue" acknowledge-mode ="AUTO_ACKNOWLEDGE" /> </jms-bus> <jms-bus busid="queuestartEsbChannel"> <jms-message-filter dest-type="QUEUE" dest-name="wsmq/SerivceOrderQueue" /> </jms-bus> </jms-provider> jboss-service.xml looks like this <mbean code="jmx.service.wsmq.WSMQConnectionFactory" name="jmx.service.wsmq:service=MQQueueConnectionFactory"> <attribute name="JndiName">MQQueueConnectionFactory</attribute> <attribute name="JMSStyle">Queue</attribute> <attribute name="IsXA">false</attribute> <attribute name="QueueManagerName">SQAT0083</attribute> <attribute name="HostName">111.111.111.111</attribute> <attribute name="Port">1415</attribute> <attribute name="Channel">MYCO.SVRCONN</attribute> <attribute name="TransportType">CLIENT</attribute> <depends>jboss:service=Naming</depends> </mbean> <mbean code="jmx.service.wsmq.WSMQDestination" name="jmx.service.wsmq:service=WSMQRequestQueue"> <attribute name="JndiName">wsmq/SerivceOrderQueue</attribute> <attribute name="JMSStyle">Queue</attribute> <attribute name="QueueManagerName">SQAT0083</attribute> <attribute name="DestinationName">MYCO.SERVICEORDER.QA01.QL01</attribute> <attribute name="TargetClient">MQ</attribute> <depends>jboss:service=Naming</depends> </mbean> I am using jboss-eap-4.3. Really appreciate any help.

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  • Check for messages apache Qpid

    - by c0mrade
    Is it possible to check for messages from Qpid queue from unix/windows console? Here is how I check via GUI : http://i47.tinypic.com/pbu5d.gif I can see all the info from Qpid JMX Management Console, is there a something close to this that I can use in console?

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  • Available message types in JMS?

    - by Caylem
    This is based on a past exam question. The question is asking to describe the four types of message available using JMS. The problem is it says the four, not just four. So it assumes their is only four, no more no less. However according to this site their seems to be five; streams maps text objects bytes *Another book states that XML is another potential type in future versions of JMS. Is XML already available? Am I missing something or is the question just wrong? Thanks.

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  • Is there an use case for non-blocking receive when I have threads?

    - by Gabriel Šcerbák
    I know non-blocking receive is not used as much in message passing, but still some intuition tells me, it is needed. Take for example GUI event driven applications, you need some way to wait for a message in a non-blocking way, so your program can execute some computations. One of the ways to solve this is to have a special thread with message queue. Is there some use case, where you would really need non-blocking receive even if you have threads?

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  • How to get encoding from MAPI message with PR_BODY_A tag (windows mobile)?

    - by SadSido
    Hi, everyone! I am developing a program, that handles incoming e-mail and sms through windows-mobile MAPI. The code basically looks like that: ulBodyProp = PR_BODY_A; hr = piMessage->OpenProperty(ulBodyProp, NULL, STGM_READ, 0, (LPUNKNOWN*)&piStream); if (hr == S_OK) { // ... get body size in bytes ... STATSTG statstg; piStream->Stat(&statstg, 0); ULONG cbBody = statstg.cbSize.LowPart; // ... allocate memory for the buffer ... BYTE* pszBodyInBytes = NULL; boost::scoped_array<BYTE> szBodyInBytesPtr(pszBodyInBytes = new BYTE[cbBody+2]); // ... read body into the pszBodyInBytes ... } That works and I have a message body. The problem is that this body is multibyte encoded and I need to return a Unicode string. I guess, I have to use ::MultiByteToWideChar() function, but how can I guess, what codepage should I apply? Using CP_UTF8 is naive, because it can simply be not in UTF8. Using CP_ACP works, well, sometimes, but sometimes does not. So, my question is: how can I retrieve the information about message codepage. Does MAPI provide any functions for it? Or is there a way to decode multibyte string, other than MultiByteToWideChar()? Thanks!

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  • google chrome extension update text after response callback

    - by Jerome
    I am writing a Google Chrome extension. I have reached the stage where I can pass messages back and forth readily but I am running into trouble with using the response callback. My background page opens a message page and then the message page requests more information from background. When the message page receives the response I want to replace some of the standard text on the message page with custom text based on the response. Here is the code: chrome.extension.sendRequest({cmd: "sendKeyWords"}, function(response) { keyWordList=response.keyWordsFound; var keyWords=""; for (var i = 0; i FIRST QUESTION: This all seems to work fine but the text on the page doesn't change. I am almost certainly because the callback completes after the page is finished loading and the rest of the code finishes before the callback completes, too. How do I update the page with the new text? Can I listen for the callback to complete or something like that? SECOND QUESTION: The procedure I am pursuing first opens the message page and then the message page requests the keyword list from background. Since I always want the keyword list, it makes more sense to just send it when I create the tab. Can I do that? Here is the code from background that opens the message page: //when request from detail page to open message page chrome.extension.onRequest.addListener(function(request, sender, sendResponse) { if(request.cmd == "openMessage") { console.log("Received Request to Open Message, Profile Score: "+request.keyWordsFound.length); keyWordList=request.keyWordsFound; chrome.tabs.create({url: request.url}, function(tab){ msgTabId=tab.id; //needed to determine if message tab has later been closed chrome.tabs.executeScript(tab.id, {file: "message.js"}); }); console.log("Opening Message"); } });

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  • Performance issues with jms and spring integration. What is wrong with the following configuration?

    - by user358448
    I have a jms producer, which generates many messages per second, which are sent to amq persistent queue and are consumed by single consumer, which needs to process them sequentially. But it seems that the producer is much faster than the consumer and i am having performance and memory problems. Messages are fetched very very slowly and the consuming seems to happen on intervals (the consumer "asks" for messages in polling fashion, which is strange?!) Basically everything happens with spring integration. Here is the configuration at the producer side. First stake messages come in stakesInMemoryChannel, from there, they are filtered throw the filteredStakesChannel and from there they are going into the jms queue (using executor so the sending will happen in separate thread) <bean id="stakesQueue" class="org.apache.activemq.command.ActiveMQQueue"> <constructor-arg name="name" value="${jms.stakes.queue.name}" /> </bean> <int:channel id="stakesInMemoryChannel" /> <int:channel id="filteredStakesChannel" > <int:dispatcher task-executor="taskExecutor"/> </int:channel> <bean id="stakeFilterService" class="cayetano.games.stake.StakeFilterService"/> <int:filter input-channel="stakesInMemoryChannel" output-channel="filteredStakesChannel" throw-exception-on-rejection="false" expression="true"/> <jms:outbound-channel-adapter channel="filteredStakesChannel" destination="stakesQueue" delivery-persistent="true" explicit-qos-enabled="true" /> <task:executor id="taskExecutor" pool-size="100" /> The other application is consuming the messages like this... The messages come in stakesInputChannel from the jms stakesQueue, after that they are routed to 2 separate channels, one persists the message and the other do some other stuff, lets call it "processing". <bean id="stakesQueue" class="org.apache.activemq.command.ActiveMQQueue"> <constructor-arg name="name" value="${jms.stakes.queue.name}" /> </bean> <jms:message-driven-channel-adapter channel="stakesInputChannel" destination="stakesQueue" acknowledge="auto" concurrent-consumers="1" max-concurrent-consumers="1" /> <int:publish-subscribe-channel id="stakesInputChannel" /> <int:channel id="persistStakesChannel" /> <int:channel id="processStakesChannel" /> <int:recipient-list-router id="customRouter" input-channel="stakesInputChannel" timeout="3000" ignore-send-failures="true" apply-sequence="true" > <int:recipient channel="persistStakesChannel"/> <int:recipient channel="processStakesChannel"/> </int:recipient-list-router> <bean id="prefetchPolicy" class="org.apache.activemq.ActiveMQPrefetchPolicy"> <property name="queuePrefetch" value="${jms.broker.prefetch.policy}" /> </bean> <bean id="connectionFactory" class="org.springframework.jms.connection.CachingConnectionFactory"> <property name="targetConnectionFactory"> <bean class="org.apache.activemq.ActiveMQConnectionFactory"> <property name="brokerURL" value="${jms.broker.url}" /> <property name="prefetchPolicy" ref="prefetchPolicy" /> <property name="optimizeAcknowledge" value="true" /> <property name="useAsyncSend" value="true" /> </bean> </property> <property name="sessionCacheSize" value="10"/> <property name="cacheProducers" value="false"/> </bean>

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  • Exposing a service to external systems - How should I design the contract?

    - by Larsi
    Hi! I know this question is been asked before here but still I'm not sure what to select. My service will be called from many 3 party system in the enterprise. I'm almost sure the information the service will collect (MyBigClassWithAllInfo) will change during the products lifetime. Is it still a good idea to expose objects? This is basically what my two alternatives: [ServiceContract] public interface ICollectStuffService { [OperationContract] SetDataResponseMsg SetData(SetDataRequestMsg dataRequestMsg); } // Alternative 1: Put all data inside a xml file [DataContract] public class SetDataRequestMsg { [DataMember] public string Body { get; set; } [DataMember] public string OtherPropertiesThatMightBeHandy { get; set; } // ?? } // Alternative 2: Expose the objects [DataContract] public class SetDataRequestMsg { [DataMember] public Header Header { get; set; } [DataMember] public MyBigClassWithAllInfo ExposedObject { get; set; } } public class SetDataResponseMsg { [DataMember] public ServiceError Error { get; set; } } The xml file would look like this: <?xml version="1.0" encoding="utf-8"?> <Message>   <Header>     <InfoAboutTheSender>...</InfoAboutTheSender>   </Header>   <StuffToCollectWithAllTheInfo>   <stuff1>...</stuff1> </StuffToCollectWithAllTheInfo> </Message> Any thought on how this service should be implemented? Thanks Larsi

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