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  • Opinion : quel avenir pour Firefox ? Le design et la communication l'ont-ils emporté sur les problématiques techniques ?

    Opinion : quel avenir pour Firefox ? Le design et la communication l'ont-ils emporté sur les problématiques techniques ? Historiquement connu comme un grand projet open source, dont la communauté a été secouée à plusieurs reprises (donnant naissance à quelques forks, dont Iceweasel), Firefox fait désormais la une comme un des grands acteurs de la navigation Web. Et ce n'est pas volé ! Outre les problématiques de sécurité, desquelles il s'est occupé très tôt, les innovations y ont été légion et nul doute que les navigateurs ne seraient pas ce qu'ils sont aujourd'hui sans cet acteur légendaire. Pourtant, depuis la version 3, une frénésie de sorties m'appelle à me poser de vraies questions s...

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  • OSI Model

    - by kaleidoscope
    The Open System Interconnection Reference Model (OSI Reference Model or OSI Model) is an abstract description for layered communications and computer network protocol design. In its most basic form, it divides network architecture into seven layers which, from top to bottom, are the Application, Presentation, Session, Transport, Network, Data Link, and Physical Layers. It is therefore often referred to as the OSI Seven Layer Model. A layer is a collection of conceptually similar functions that provide services to the layer above it and receives service from the layer below it. Description of OSI layers: Layer 1: Physical Layer ·         Defines the electrical and physical specifications for devices. In particular, it defines the relationship between a device and a physical medium. ·         Establishment and termination of a connection to a communications medium. ·         Participation in the process whereby the communication resources are effectively shared among multiple users. ·         Modulation or conversion between the representation of digital data in user equipment and the corresponding signals transmitted over a communications channel. Layer 2: Data Link Layer ·         Provides the functional and procedural means to transfer data between network entities. ·         Detect and possibly correct errors that may occur in the Physical Layer. The error check is performed using Frame Check Sequence (FCS). ·         Addresses is then sought to see if it needs to process the rest of the frame itself or whether to pass it on to another host. ·         The Layer is divided into two sub layers: The Media Access Control (MAC) layer and the Logical Link Control (LLC) layer. ·         MAC sub layer controls how a computer on the network gains access to the data and permission to transmit it. ·         LLC layer controls frame synchronization, flow control and error checking.   Layer 3: Network Layer ·         Provides the functional and procedural means of transferring variable length data sequences from a source to a destination via one or more networks. ·         Performs network routing functions, and might also perform fragmentation and reassembly, and report delivery errors. ·         Network Layer Routers operate at this layer—sending data throughout the extended network and making the Internet possible.   Layer 4: Transport Layer ·         Provides transparent transfer of data between end users, providing reliable data transfer services to the upper layers. ·         Controls the reliability of a given link through flow control, segmentation/de-segmentation, and error control. ·         Transport Layer can keep track of the segments and retransmit those that fail. Layer 5: Session Layer ·         Controls the dialogues (connections) between computers. ·         Establishes, manages and terminates the connections between the local and remote application. ·         Provides for full-duplex, half-duplex, or simplex operation, and establishes checkpointing, adjournment, termination, and restart procedures. ·         Implemented explicitly in application environments that use remote procedure calls. Layer 6: Presentation Layer ·         Establishes a context between Application Layer entities, in which the higher-layer entities can use different syntax and semantics, as long as the presentation service understands both and the mapping between them. The presentation service data units are then encapsulated into Session Protocol data units, and moved down the stack. ·         Provides independence from differences in data representation (e.g., encryption) by translating from application to network format, and vice versa. The presentation layer works to transform data into the form that the application layer can accept. This layer formats and encrypts data to be sent across a network, providing freedom from compatibility problems. It is sometimes called the syntax layer. Layer 7: Application Layer ·         This layer interacts with software applications that implement a communicating component. ·         Identifies communication partners, determines resource availability, and synchronizes communication. o       When identifying communication partners, the application layer determines the identity and availability of communication partners for an application with data to transmit. o       When determining resource availability, the application layer must decide whether sufficient network or the requested communication exists. o       In synchronizing communication, all communication between applications requires cooperation that is managed by the application layer. Technorati Tags: Kunal,OSI,Networking

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  • Using thread inter-communication to increase my server app's IO throughput; not sure how

    - by Howard Guo
    My server application creates a new thread for each incoming connection. Incoming requests are serialized in a BlockingQueue. There is one worker thread taking items from the queue, produce a response and send the response through socket. I have noticed a throughput issue: Currently, worker thread is responsible of sending the response message through socket, thus severely wasting processing power and throughput. I am considering: rather than sending the response itself, why not telling network IO threads to send the response? However, when I think about thread inter-communication, I cannot yet figure out how to approach it: Worker thread will produce a response, but how will it inform the response message to IO thread? Is there a standard/best practice? Thank you.

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  • Android - Good alternatives to XMPP or REST for communication between servers and clients?

    - by Ann
    Hello I am doing a project. For my project i need to create an Android application. I will use Java and Eclipse. The main idea of app. The application works on environment/location. Example the application needs to pick up on the users location. He should then also be able to communicate with his friends or colleagues which are in the same location. My question: I am looking for a good alternatives to XMPP or REST for communication between servers and clients? Any advice. Kind regards

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  • How to establish the real-time communication between Shopping cart running MySQL and Internal System Running PostgreSQL [closed]

    - by Andrew
    I am thinking about the way of establishing some-sort of real-time connection between MySQLpowered shopping cart and internal system that is running on PostgreSQL. Could you give me some sort of insight on this topic? For example, I can write some sort of csv export application, then enable remote MySQL for over the internet connection and then import csv to mysql directly from PC. Or upload csv and run cron on server. But this way of import-export causing delays; so I would like to link databased (or some msort). I have never done it before and would like to hear some opinions about this. Another way "just a thought" might to implement triggers that would initiate the update process via csv; but again, I would like to avoid csv. Do you have any good advise? Maybe some specific examples?

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  • How can you test communication on a COM/Serial port?

    - by Andy
    We have a OHAUAS Weighting scales with a COM port. if we connect this to a PC we should be able to get the weight on the computer by sending a command to it. Is there a way to test this? i tried the command line echo "LP" com1 but this does nothing. A small C# application that listens to this port seems to be continuously receive Hexadecimal numbers (2 digits then an enter), however sending a command through this application doesn't give readable results. When i do listen on the port though, the echo "LP" com1 command gives an unavaible error, so sending the command works in cmd. Does anyone have any knowledge on a simple way to test a send and receive on a com port?

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  • Do I need a VPN to secure communication over a T1 line?

    - by Seth
    I have a dedicated T1 line that runs between my office and my data center. Both ends have public IP addresses. On both ends, we have a T1 routers which connect to SonicWall firewalls. The SonicWalls do a site-to-site VPN and handle the network translation, so the computers on the office network (10.0.100.x) can access the servers in the rack (10.0.103.x). So the question: can I just add a static route to the SonicWalls so each network can access each other with out the VPN? Are there security problems (such as, someone else adding the appropriate static route and being able to access either the office or the datacenter)? Is there another / better way to do it? The reason I'm looking at this is because the T1 is already a pretty small pipe, and having the VPN overhead makes connectivity really slow.

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  • Why Would one VLAN have no Communication on one Switch?

    - by Webs
    So the problem is we have a device or host that needs to communicate on a specific VLAN. This VLAN is not new, it is running all throughout our environment and works fine. But the VLAN was recently configured on the switch in question, a Cisco 3750. The DHCP server is handing out addresses on that VLAN with no problem. I have verified the cable between the host and switch and tried multiple hosts, but none of them can communicate or get an address. I plugged my laptop into an empty port which had a different VLAN assigned and immediately got a DHCP address. When I changed that port to the same VLAN I'm having issues with I got the same problem. The laptop just sits there and tries to DHCP an address but nothing happens. I double checked the cores and their Layer 3 VLAN config and its fine too. Plus I figured the issue couldn't be with them because the VLAN works fine everywhere else it exists. So the only other thing I can think of is the switch, but the VLAN exists on the switch and seems to be configured correctly. The trunks appear to be configured just fine as well too. Anyone have any ideas? I'm lost on this one.

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  • HTTPS vs. VPN for communication between business partners?

    - by Andrew H
    A business partner has asked to set up a site-to-site VPN just so that a few servers can communicate with each other over HTTPS. I'm convinced this isn't necessary, or even desirable. To be fair it must be part of a wider policy, potentially even a legal requirement. However I'd like to convince them to simply offer an IP to us (and us only) and a port of their choosing for HTTPS. Has anyone had a similar experience, or had to come up with a cast-iron argument against a VPN? Allow me to expand a little - we have a web service that initiates a connection to the partner's corresponding service using an encrypted HTTP connection. The connection uses a client certificate to authenticate. The connection is firewalled so only our IPs can contact the service. So why is a VPN necessary?

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  • Safely transfer files from pc with internet connection to lan without allowing any other form of communication

    - by Hugh Quenneville
    In the company that I work there are computers that are connected to the Internet and computers that are connected to a Local Area Network. The LAN is considered a "safe zone" and the files that reside there should never be copied/moved to a computer that has Internet Access. So, now, if we want to download an installer for an application for example, we download it in a pc that has Internet Access and then move it using a "secure USB stick" to the Local Area Network. Is there a way to create an "safe, one-way connection" between a computer with Internet access and a computer from the LAN? This practically means that only files from the computer with the Internet access can be copied/moved to the LAN. In addition to that, if you want to transfer files you would have to provide your security credentials for the network (so, that only users with the appropriate access levels will be able to transfer files). Is it possible to create something like that and make it completely safe (or at least "equally safe" with the USB method that we currently use) or the fact that the computer with Internet access is connected with a wire to the LAN is a security risk by itself? NOTE: the LAN setup involves 2 Windows 2003 servers with Active Directory, Web servers and pretty much all the services that you would expect to find in a Windows network.

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  • Client Server communication in Java - which approach to use?

    - by markovuksanovic
    I have a typical client server communication - Client sends data to the server, server processes that, and returns data to the client. The problem is that the process operation can take quite some time - order of magnitude - minutes. There are a few approaches that could be used to solve this. Establish a connection, and keep it alive, until the operation is finished and the client receives the response. Establish connection, send data, close the connection. Now the processing takes place and once it is finished the server could establish a connection to the client to send the data. Establish a connection, send data, close the connection. Processing takes place. client asks server, every n minutes/seconds if the operation is finished. If the processing is finished the client fetches the data. I was wondering which approach would be the best way to use. Is there maybe some "de facto" standard for solving this problem? How "expensive" is opening a socket in Java? Solution 1. seems pretty nasty to me, but 2. and 3. could do. The problem with solution 2. is that the server needs to know on which port the client is listening, while solution 3. adds some network overhead.

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  • What's the best Communication Pattern for EJB3-based applications?

    - by Hank
    I'm starting a JEE project that needs to be strongly scalable. So far, the concept was: several Message Driven Beans, responsible for different parts of the architecture each MDB has a Session Bean injected, handling the business logic a couple of Entity Beans, providing access to the persistence layer communication between the different parts of the architecture via Request/Reply concept via JMS messages: MDB receives msg containing activity request uses its session bean to execute necessary business logic returns response object in msg to original requester The idea was that by de-coupling parts of the architecture from each other via the message bus, there is no limit to the scalability. Simply start more components - as long as they are connected to the same bus, we can grow and grow. Unfortunately, we're having massive problems with the request-reply concept. Transaction Mgmt seems to be in our way plenty. It seams that session beans are not supposed to consume messages?! Reading http://blogs.sun.com/fkieviet/entry/request_reply_from_an_ejb and http://forums.sun.com/message.jspa?messageID=10338789, I get the feeling that people actually recommend against the request/reply concept for EJBs. If that is the case, how do you communicate between your EJBs? (Remember, scalability is what I'm after) Details of my current setup: MDB 1 'TestController', uses (local) SLSB 1 'TestService' for business logic TestController.onMessage() makes TestService send a message to queue XYZ and requests a reply TestService uses Bean Managed Transactions TestService establishes a connection & session to the JMS broker via a joint connection factory upon initialization (@PostConstruct) TestService commits the transaction after sending, then begins another transaction and waits 10 sec for the response Message gets to MDB 2 'LocationController', which uses (local) SLSB 2 'LocationService' for business logic LocationController.onMessage() makes LocationService send a message back to the requested JMSReplyTo queue Same BMT concept, same @PostConstruct concept all use the same connection factory to access the broker Problem: The first message gets send (by SLSB 1) and received (by MDB 2) ok. The sending of the returning message (by SLSB 2) is fine as well. However, SLSB 1 never receives anything - it just times out. I tried without the messageSelector, no change, still no receiving message. Is it not ok to consume message by a session bean? SLSB 1 - TestService.java @Resource(name = "jms/mvs.MVSControllerFactory") private javax.jms.ConnectionFactory connectionFactory; @PostConstruct public void initialize() { try { jmsConnection = connectionFactory.createConnection(); session = jmsConnection.createSession(false, Session.AUTO_ACKNOWLEDGE); System.out.println("Connection to JMS Provider established"); } catch (Exception e) { } } public Serializable sendMessageWithResponse(Destination reqDest, Destination respDest, Serializable request) { Serializable response = null; try { utx.begin(); Random rand = new Random(); String correlationId = rand.nextLong() + "-" + (new Date()).getTime(); // prepare the sending message object ObjectMessage reqMsg = session.createObjectMessage(); reqMsg.setObject(request); reqMsg.setJMSReplyTo(respDest); reqMsg.setJMSCorrelationID(correlationId); // prepare the publishers and subscribers MessageProducer producer = session.createProducer(reqDest); // send the message producer.send(reqMsg); System.out.println("Request Message has been sent!"); utx.commit(); // need to start second transaction, otherwise the first msg never gets sent utx.begin(); MessageConsumer consumer = session.createConsumer(respDest, "JMSCorrelationID = '" + correlationId + "'"); jmsConnection.start(); ObjectMessage respMsg = (ObjectMessage) consumer.receive(10000L); utx.commit(); if (respMsg != null) { response = respMsg.getObject(); System.out.println("Response Message has been received!"); } else { // timeout waiting for response System.out.println("Timeout waiting for response!"); } } catch (Exception e) { } return response; } SLSB 2 - LocationService.Java (only the reply method, rest is same as above) public boolean reply(Message origMsg, Serializable o) { boolean rc = false; try { // check if we have necessary correlationID and replyTo destination if (!origMsg.getJMSCorrelationID().equals("") && (origMsg.getJMSReplyTo() != null)) { // prepare the payload utx.begin(); ObjectMessage msg = session.createObjectMessage(); msg.setObject(o); // make it a response msg.setJMSCorrelationID(origMsg.getJMSCorrelationID()); Destination dest = origMsg.getJMSReplyTo(); // send it MessageProducer producer = session.createProducer(dest); producer.send(msg); producer.close(); System.out.println("Reply Message has been sent"); utx.commit(); rc = true; } } catch (Exception e) {} return rc; } sun-resources.xml <admin-object-resource enabled="true" jndi-name="jms/mvs.LocationControllerRequest" res-type="javax.jms.Queue" res-adapter="jmsra"> <property name="Name" value="mvs.LocationControllerRequestQueue"/> </admin-object-resource> <admin-object-resource enabled="true" jndi-name="jms/mvs.LocationControllerResponse" res-type="javax.jms.Queue" res-adapter="jmsra"> <property name="Name" value="mvs.LocationControllerResponseQueue"/> </admin-object-resource> <connector-connection-pool name="jms/mvs.MVSControllerFactoryPool" connection-definition-name="javax.jms.QueueConnectionFactory" resource-adapter-name="jmsra"/> <connector-resource enabled="true" jndi-name="jms/mvs.MVSControllerFactory" pool-name="jms/mvs.MVSControllerFactoryPool" />

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  • Microsft Lync mobile bientôt disponible sur Windows Phone, Android, iOS et BlackBerry

    Microsft Lync mobile bientôt disponible sur Windows Phone Android, iOS et BlackBerry Lync , L'outil de communication professionnel de Microsoft sera bientôt disponible sur plusieurs plateformes mobiles différentes. La division australienne de la firme a annoncé dans un message sur Twitter, que des applications mobiles Lync pour Windows Phone, Android, iOS et BalckBerry seront publiées dans les quatre semaines à venir. [IMG]http://rdonfack.developpez.com/images/LyncMobile.PNG[/IMG] Anciennement connu sous le nom d'Office Communication server 2007 R2, Microsoft Lync 2010 est une solution de communication qui unifie les conférences par voix, messageries instant...

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  • WS-Eventing for WCF (Indigo)

    This article describes the design, implementation and usage of the WS-Eventing for distributed applications driven by new MS communication model WCF (Windows Communication Foundation)

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  • Why is "wsdl" namespace interjected into action name when using savon for ruby soap communication?

    - by Nick Gorbikoff
    I'm trying to access a SOAP service i don't control. One of the actions is called ProcessMessage. I follow example and generate a SOAP request, but I get an error back saying that the action doesn't exist. I traced the problem to the way the body of the envelope is generated. <env:Envelope ... "> <env:Header> <wsse:Security ... "> <wsse:UsernameToken ..."> <wsse:Username>USER</wsse:Username> <wsse:Nonce>658e702d5feff1777a6c741847239eb5d6d86e48</wsse:Nonce> <wsu:Created>2010-02-18T02:05:25Z</wsu:Created> <wsse:Password ... >password</wsse:Password> </wsse:UsernameToken> </wsse:Security> </env:Header> <env:Body> <wsdl:ProcessMessage> <payload> ...... </payload> </wsdl:ProcessMessage> </env:Body> </env:Envelope> That ProcessMessage tag should be : <ProcessMessage xmlns="http://www.starstandards.org/webservices/2005/10/transport"> That's what it is when it is generated by the sample java app, and it works. That tag is the only difference between what my ruby app generates and the sample java app. Is there any way to get rid of the "wsdl:" namesaplce in front of that one tag and add an attribute like that. Barring that, is there a way to make force the action to be not to be generated by just passed as a string like the rest of the body? Here is my code. require 'rubygems' require 'savon' client = Savon::Client.new "https://gmservices.pp.gm.com/ProcessMessage?wsdl" response = client.process_message! do | soap, wsse | wsse.username = "USER" wsse.password = "password" soap.namespace = "http://www.starstandards.org/webservices/2005/10/transport" #makes no difference soap.action = "ProcessMessage" #makes no difference soap.input = "ProcessMessage" #makes no difference #my body at this point is jsut one big xml string soap.body = "<payload>...</payload>" # putting <ProccessMessage> tag here doesn't help as it just creates a duplicate tag in the body, since Savon keeps interjecting <wsdl:ProcessMessage> tag. end Thank you P.S.: I tried handsoap but it doesn't support httpS and is confusing, and I tried soap4r but but it'even more confusing than handsoap.

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  • How can I learn a multitouch screen's communication protocol and write a C# application for it?

    - by puri
    I have got a monitor with multitouch overlay on top of it. It works fine with Windows 7 but I want to write a multitouch application in C# for Windows XP which doesn't support touch feature out of the box. There is no documentation whatsoever and I emailed the manufacturer but never got a reply. However the device works with Google Earth, which doesn't natively support multitouch, on Windows XP. So I think it generates many types of messages together i.e. WM_TOUCH for Windows 7, one for Google Earth COM API, and probably its own messages either in UDP or Windows message form. How can I trap all communications and learn the protocol?

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  • Can an iPhone/iPod Touch application open a port for remote communication without jailbreaking?

    - by Derrick
    I'm researching remote control testing for an app that'll be installed on the new iPod Touch and can't tell for certain from everything that I've read whether or not an installed app can or can't open any ports for remote test instructions (that's a mouthful : ) We created something like this for the Android using adb port forwarding and telnet, and it worked really well. Is there any chance something similar could be done on an iPhone or iPod without jailbreaking??

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