Figure DJ11 The Multicast Request Protocol in Java

Printing Code 128 Code Set B in Java Figure DJ11 The Multicast Request Protocol
Figure DJ11 The Multicast Request Protocol
Generating Code 128 Code Set B In Java
Using Barcode creation for Java Control to generate, create Code-128 image in Java applications.
DJ143 The Multicast Announcement Protocol
Bar Code Creator In Java
Using Barcode maker for Java Control to generate, create bar code image in Java applications.
The multicast announcement protocol follows these steps: 1 Interested entities on the network listen for multicast announcements of the existence of lookup services If an announcement of interest arrives at such an entity, it uses the unicast discovery protocol to contact the given lookup service 2 Lookup services prepare to take part in the unicast discovery protocol (see below) and send multicast announcements of their existence at regular intervals
Bar Code Reader In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
DJ144 The Unicast Discovery Protocol
Code 128 Code Set C Generation In C#
Using Barcode maker for .NET framework Control to generate, create Code-128 image in Visual Studio .NET applications.
The unicast discovery protocol works as follows: 1 The lookup service listens for incoming connections and, when a connection is made by a client, decodes the request and, if the request is correct, responds with a marshalled object that implements the netjinicorelookupServiceRegistrar interface 2 An entity that wishes to contact a particular lookup service uses known host and port information to establish a connection to that service It sends a discovery request and listens for a marshalled object as above in response DJ1 Introduction 71
Code 128 Code Set A Maker In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create Code 128B image in ASP.NET applications.
O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition
Code128 Generation In .NET
Using Barcode printer for .NET Control to generate, create USS Code 128 image in Visual Studio .NET applications.
DJ1 Introduction
Code-128 Printer In VB.NET
Using Barcode maker for .NET framework Control to generate, create Code 128 image in VS .NET applications.
O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition
Barcode Generation In Java
Using Barcode generator for Java Control to generate, create bar code image in Java applications.
Section: DJ Discovery and Join
Code 128A Printer In Java
Using Barcode creation for Java Control to generate, create Code-128 image in Java applications.
DJ2 The Discovery Protocols
Data Matrix Creation In Java
Using Barcode encoder for Java Control to generate, create Data Matrix ECC200 image in Java applications.
There are three closely related discovery protocols: one is used to discover one or more lookup services on a local area network (LAN), another is used to announce the presence of a lookup service on a local network, and the last is used to establish communications with a specific lookup service over a wide area network (WAN) DJ21 Protocol Roles The multicast discovery protocols work together over time When an entity is initially started, it uses the multicast request protocol to actively seek out nearby lookup services After a limited period of time performing active discovery in this way, it ceases using the multicast request protocol and switches over to listening for multicast lookup announcements via the multicast announcement protocol DJ22 The Multicast Request Protocol The multicast request protocol allows an entity that has just been started, or that needs to provide browsing capabilities to a user, to actively discover nearby lookup services
Generate GTIN - 128 In Java
Using Barcode generator for Java Control to generate, create GS1 128 image in Java applications.
DJ221 Protocol Participants
Draw Bar Code In Java
Using Barcode encoder for Java Control to generate, create barcode image in Java applications.
Several components take part in the multicast request protocol Of these, two run on an entity that is performing multicast requests, and two run on the entity that listens for such requests and responds On the requesting side live the following components: A multicast request client performs multicasts to discover nearby lookup services A multicast response server listens for responses from those lookup services These components are paired; they do not occur separately Any number of pairs of such components may coexist in a single JVM at any given time The lookup service houses the other two participants: A multicast request server listens for incoming multicast requests A multicast response client responds to callers, passing each a proxy that allows it to communicate with its lookup service Although these components are paired, as on the client side, only a single pair will typically be associated with each lookup service These local pairings apart, the remote client/server pairings should be clear from the above description and the diagram of protocol participants in Figure DJ21
Paint 2 Of 5 Standard In Java
Using Barcode creator for Java Control to generate, create Code 2/5 image in Java applications.
Figure DJ21 Multicast Request Protocol Participants
Bar Code Printer In VB.NET
Using Barcode encoder for Visual Studio .NET Control to generate, create barcode image in VS .NET applications.
DJ2 The Discovery Protocols
Read Data Matrix 2d Barcode In .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
O'Reilly Network Safari Bookshelf Jini Specifications, The, Second Edition
Barcode Maker In VS .NET
Using Barcode maker for ASP.NET Control to generate, create barcode image in ASP.NET applications.
DJ222 The Multicast Request Service
Bar Code Maker In Visual Basic .NET
Using Barcode creation for .NET Control to generate, create bar code image in Visual Studio .NET applications.
The multicast request service is not based on Java RMI; instead, it makes use of the multicast datagram facility of the networking transport layer to request that lookup services advertise their availability to a requesting host In a TCP/IP environment the network protocol used is multicast UDP Request datagrams are encoded as a sequence of bytes, using the data and object serialization facilities of the Java programming language to provide platform independence
Barcode Scanner In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
DJ223 Request Packet Format
Code 3/9 Drawer In VS .NET
Using Barcode creator for ASP.NET Control to generate, create Code 39 Extended image in ASP.NET applications.
A multicast discovery request packet body must: Be 512 bytes in size or less, in order to fit into a single UDP datagram Encapsulate its parameters in a platform independent manner Be straightforward to encode and decode Accordingly, we define the packet format to be a contiguous series of bytes as would be produced by a javaioDataOutputStream object writing into a javaioByteArrayOutputStream object The contents of the packet, in order of appearance, are illustrated by the following fragment of pseudocode which generates the appropriate byte array:
Making Code 128 Code Set A In Visual C#
Using Barcode printer for .NET framework Control to generate, create ANSI/AIM Code 128 image in .NET framework applications.
int protoVersion; int port; javalangString[] groups; netjinicorelookupServiceID[] heard; // // // // protocol version port to contact groups of interest known lookups
javaioByteArrayOutputStream byteStr = new javaioByteArrayOutputStream(); javaioDataOutputStream objStr = new javaioDataOutputStream(byteStr); objStrwriteInt(protoVersion); objStrwriteInt(port); objStrwriteInt(heardlength); for (int i = 0; i < heardlength; i++) { heard[i]writeBytes(objStr); } objStrwriteInt(groupslength); for (int i = 0; i < groupslength; i++) { objStrwriteUTF(groups[i]); } byte[] packetBody = byteStrtoByteArray(); // the final result