tnameserv.1

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.\"     Arch: generic
.\"     Software: JDK 8
.\"     Date: 21 November 2013
.\"     SectDesc: Java IDL and RMI-IIOP Tools
.\"     Title: tnameserv.1
.\"
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.TH tnameserv 1 "21 November 2013" "JDK 8" "Java IDL and RMI-IIOP Tools"
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.SH NAME    
tnameserv \- Interface Definition Language (IDL)\&.
.SH SYNOPSIS    
.sp     
.nf     

\fBtnameserve\fR \fB\-ORBInitialPort\fR [ \fInameserverport\fR ]
.fi     
.sp     
.TP
-ORBInitialPort \fInameserverport\fR
.br
The initial port where the naming service listens for the bootstrap protocol used to implement the ORB \f3resolve_initial_references\fR and \f3list_initial_references\fR methods\&.
.SH DESCRIPTION    
Java IDL includes the Object Request Broker Daemon (ORBD)\&. ORBD is a daemon process that contains a Bootstrap Service, a Transient Naming Service, a Persistent Naming Service, and a Server Manager\&. The Java IDL tutorials all use ORBD, but you can substitute the \f3tnameserv\fR command for the \f3orbd\fR command in any of the examples that use a Transient Naming Service\&.
.PP
See orbd(1) or Naming Service at http://docs\&.oracle\&.com/javase/8/docs/technotes/guides/idl/jidlNaming\&.html
.PP
The CORBA Common Object Services (COS) Naming Service provides a tree-structure directory for object references similar to a file system that provides a directory structure for files\&. The Transient Naming Service provided with Java IDL, \f3tnameserv\fR, is a simple implementation of the COS Naming Service specification\&.
.PP
Object references are stored in the name space by name and each object reference-name pair is called a name binding\&. Name bindings can be organized under naming contexts\&. Naming contexts are name bindings and serve the same organizational function as a file system subdirectory\&. All bindings are stored under the initial naming context\&. The initial naming context is the only persistent binding in the name space\&. The rest of the name space is lost when the Java IDL naming service process stops and restarts\&.
.PP
For an applet or application to use COS naming, its ORB must know the port of a host running a naming service or have access to an initial naming context string for that naming service\&. The naming service can either be the Java IDL naming service or another COS-compliant naming service\&.
.SS START\ THE\ NAMING\ SERVICE    
You must start the Java IDL naming service before an application or applet that uses its naming service\&. Installation of the Java IDL product creates a script (Oracle Solaris: \f3tnameserv\fR) or executable file (Windows: \f3tnameserv\&.exe\fR) that starts the Java IDL naming service\&. Start the naming service so it runs in the background\&.
.PP
If you do not specify otherwise, then the Java IDL naming service listens on port 900 for the bootstrap protocol used to implement the ORB \f3resolve_initial_references\fR and \f3list_initial_references methods\fR, as follows:
.sp     
.nf     
\f3tnameserv \-ORBInitialPort nameserverport&\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
If you do not specify the name server port, then port 900 is used by default\&. When running Oracle Solaris software, you must become the root user to start a process on a port below 1024\&. For this reason, it is recommended that you use a port number greater than or equal to 1024\&. To specify a different port, for example, 1050, and to run the naming service in the background, from a UNIX command shell, enter:
.sp     
.nf     
\f3tnameserv \-ORBInitialPort 1050&\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
From an MS-DOS system prompt (Windows), enter:
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.nf     
\f3start tnameserv \-ORBInitialPort 1050\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
Clients of the name server must be made aware of the new port number\&. Do this by setting the \f3org\&.omg\&.CORBA\&.ORBInitialPort\fR property to the new port number when you create the ORB object\&.
.SS RUN\ THE\ SERVER\ AND\ CLIENT\ ON\ DIFFERENT\ HOSTS    
In most of the Java IDL and RMI-IIOP tutorials, the naming service, server, and client are all running on the development machine\&. In real-world deployment, the client and server probably run on different host machines from the Naming Service\&.
.PP
For the client and server to find the Naming Service, they must be made aware of the port number and host on which the naming service is running\&. Do this by setting the \f3org\&.omg\&.CORBA\&.ORBInitialPort\fR and \f3org\&.omg\&.CORBA\&.ORBInitialHost\fR properties in the client and server files to the machine name and port number on which the Naming Service is running\&. An example of this is shown in Getting Started Using RMI-IIOP at http://docs\&.oracle\&.com/javase/8/docs/technotes/guides/rmi-iiop/rmiiiopexample\&.html
.PP
You could also use the command-line options \f3-ORBInitialPort nameserverport#\fR and \f3-ORBInitialHost nameserverhostname\fR to tell the client and server where to find the naming service\&. For one example of doing this using the command-line option, see Java IDL: The Hello World Example on Two Machines at http://docs\&.oracle\&.com/javase/8/docs/technotes/guides/idl/tutorial/jidl2machines\&.html
.PP
For example, suppose the Transient Naming Service, \f3tnameserv\fR is running on port 1050 on host \f3nameserverhost\fR\&. The client is running on host \f3clienthost,\fR and the server is running on host \f3serverhost\fR\&.
.PP
Start \f3tnameserv\fR on the host \f3nameserverhost\fR:
.sp     
.nf     
\f3tnameserv \-ORBInitialPort 1050\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
Start the server on the \f3serverhost\fR:
.sp     
.nf     
\f3java Server \-ORBInitialPort 1050 \-ORBInitialHost nameserverhost\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
Start the client on the \f3clienthost\fR:
.sp     
.nf     
\f3java Client \-ORBInitialPort 1050 \-ORBInitialHost nameserverhost\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
.SS STOP\ THE\ NAMING\ SERVICE    
To stop the Java IDL naming service, use the relevant operating system command, such as \f3kill\fR for a Unix process or \f3Ctrl+C\fR for a Windows process\&. The naming service continues to wait for invocations until it is explicitly shut down\&. Note that names registered with the Java IDL naming service disappear when the service is terminated\&.
.SH OPTIONS    
.TP
-J\fIoption\fR
.br
Passes \f3option\fR to the Java Virtual Machine, where \f3option\fR is one of the options described on the reference page for the Java application launcher\&. For example, \f3-J-Xms48m\fR sets the startup memory to 48 MB\&. See java(1)\&.
.SH EXAMPLES    
.SS ADD\ OBJECTS\ TO\ THE\ NAME\ SPACE    
The following example shows how to add names to the name space\&. It is a self-contained Transient Naming Service client that creates the following simple tree\&.
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\f3Initial Naming Context\fP
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\f3     plans\fP
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\f3     Personal\fP
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\f3          calendar\fP
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\f3          schedule\fP
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\f3\fP
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In this example, \f3plans\fR is an object reference and \f3Personal\fR is a naming context that contains two object references: \f3calendar\fR and \f3schedule\fR\&.
.sp     
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\f3import java\&.util\&.Properties;\fP
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\f3import org\&.omg\&.CORBA\&.*;\fP
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\f3import org\&.omg\&.CosNaming\&.*;\fP
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\f3\fP
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\f3public class NameClient {\fP
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\f3\fP
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\f3    public static void main(String args[]) {\fP
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\f3\fP
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\f3        try {\fP
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.nf     
\f3\fP
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.sp     
In Start the Naming Service, the \f3nameserver\fR was started on port 1050\&. The following code ensures that the client program is aware of this port number\&.
.sp     
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\f3            Properties props = new Properties();\fP
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\f3            props\&.put("org\&.omg\&.CORBA\&.ORBInitialPort", "1050");\fP
.fi     
.nf     
\f3            ORB orb = ORB\&.init(args, props);\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
This code obtains the initial naming context and assigns it to \f3ctx\fR\&. The second line copies \f3ctx\fR into a dummy object reference \f3objref\fR that is attached to various names and added into the name space\&.
.sp     
.nf     
\f3            NamingContext ctx =\fP
.fi     
.nf     
\f3                NamingContextHelper\&.narrow(\fP
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.nf     
\f3                    orb\&.resolve_initial_references("NameService"));\fP
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\f3             NamingContext objref = ctx;\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
This code creates a name \f3plans\fR of type \f3text\fR and binds it to the dummy object reference\&. \f3plans\fR is then added under the initial naming context using the \f3rebind\fR method\&. The \f3rebind\fR method enables you to run this program over and over again without getting the exceptions from using the \f3bind\fR method\&.
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\f3            NameComponent nc1 = new NameComponent("plans", "text");\fP
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\f3            NameComponent[] name1 = {nc1};\fP
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\f3            ctx\&.rebind(name1, objref);\fP
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\f3            System\&.out\&.println("plans rebind successful!");\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
This code creates a naming context called \f3Personal\fR of type \f3directory\fR\&. The resulting object reference, \f3ctx2\fR, is bound to the \f3name\fR and added under the initial naming context\&.
.sp     
.nf     
\f3            NameComponent nc2 = new NameComponent("Personal", "directory");\fP
.fi     
.nf     
\f3            NameComponent[] name2 = {nc2};\fP
.fi     
.nf     
\f3            NamingContext ctx2 = ctx\&.bind_new_context(name2);\fP
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\f3            System\&.out\&.println("new naming context added\&.\&.");\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
The remainder of the code binds the dummy object reference using the names \f3schedule\fR and \f3calendar\fR under the \f3Personal\fR naming context (\f3ctx2\fR)\&.
.sp     
.nf     
\f3            NameComponent nc3 = new NameComponent("schedule", "text");\fP
.fi     
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\f3            NameComponent[] name3 = {nc3};\fP
.fi     
.nf     
\f3            ctx2\&.rebind(name3, objref);\fP
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\f3            System\&.out\&.println("schedule rebind successful!");\fP
.fi     
.nf     
\f3\fP
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.nf     
\f3            NameComponent nc4 = new NameComponent("calender", "text");\fP
.fi     
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\f3            NameComponent[] name4 = {nc4};\fP
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\f3            ctx2\&.rebind(name4, objref);\fP
.fi     
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\f3            System\&.out\&.println("calender rebind successful!");\fP
.fi     
.nf     
\f3        } catch (Exception e) {\fP
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\f3            e\&.printStackTrace(System\&.err);\fP
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\f3        }\fP
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\f3    }\fP
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.nf     
\f3}\fP
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.nf     
\f3\fP
.fi     
.sp     
.SS BROWSING\ THE\ NAME\ SPACE    
The following sample program shoes how to browse the name space\&.
.sp     
.nf     
\f3import java\&.util\&.Properties;\fP
.fi     
.nf     
\f3import org\&.omg\&.CORBA\&.*;\fP
.fi     
.nf     
\f3import org\&.omg\&.CosNaming\&.*;\fP
.fi     
.nf     
\f3\fP
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.nf     
\f3public class NameClientList {\fP
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\f3\fP
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\f3    public static void main(String args[]) {\fP
.fi     
.nf     
\f3\fP
.fi     
.nf     
\f3        try {\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
In Start the Naming Service, the \f3nameserver\fR was started on port 1050\&. The following code ensures that the client program is aware of this port number\&.
.sp     
.nf     
\f3            Properties props = new Properties();\fP
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.nf     
\f3            props\&.put("org\&.omg\&.CORBA\&.ORBInitialPort", "1050");\fP
.fi     
.nf     
\f3            ORB orb = ORB\&.init(args, props);\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
The following code obtains the initial naming context\&.
.sp     
.nf     
\f3            NamingContext nc =\fP
.fi     
.nf     
\f3            NamingContextHelper\&.narrow(\fP
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\f3                orb\&.resolve_initial_references("NameService"));\fP
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.nf     
\f3\fP
.fi     
.sp     
The \f3list\fR method lists the bindings in the naming context\&. In this case, up to 1000 bindings from the initial naming context will be returned in the \f3BindingListHolder\fR; any remaining bindings are returned in the \f3BindingIteratorHolder\fR\&.
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\f3            BindingListHolder bl = new BindingListHolder();\fP
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\f3            BindingIteratorHolder blIt= new BindingIteratorHolder();\fP
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\f3            nc\&.list(1000, bl, blIt);\fP
.fi     
.nf     
\f3\fP
.fi     
.sp     
This code gets the array of bindings out of the returned \f3BindingListHolder\fR\&. If there are no bindings, then the program ends\&.
.sp     
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\f3            Binding bindings[] = bl\&.value;\fP
.fi     
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\f3            if (bindings\&.length == 0) return;\fP
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.nf     
\f3\fP
.fi     
.sp     
The remainder of the code loops through the bindings and prints outs the names\&.
.sp     
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\f3            for (int i=0; i < bindings\&.length; i++) {\fP
.fi     
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\f3\fP
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\f3                // get the object reference for each binding\fP
.fi     
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\f3                org\&.omg\&.CORBA\&.Object obj = nc\&.resolve(bindings[i]\&.binding_name);\fP
.fi     
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\f3                String objStr = orb\&.object_to_string(obj);\fP
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.nf     
\f3                int lastIx = bindings[i]\&.binding_name\&.length\-1;\fP
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.nf     
\f3\fP
.fi     
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\f3                // check to see if this is a naming context\fP
.fi     
.nf     
\f3                if (bindings[i]\&.binding_type == BindingType\&.ncontext) {\fP
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.nf     
\f3                    System\&.out\&.println("Context: " +\fP
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.nf     
\f3                        bindings[i]\&.binding_name[lastIx]\&.id);\fP
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.nf     
\f3                } else {\fP
.fi     
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\f3                    System\&.out\&.println("Object: " +\fP
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\f3                        bindings[i]\&.binding_name[lastIx]\&.id);\fP
.fi     
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\f3                }\fP
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\f3            }\fP
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\f3        } catch (Exception e) {\fP
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\f3            e\&.printStackTrace(System\&.err)\fP
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\f3        }\fP
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.nf     
\f3    }\fP
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\f3}\fP
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.nf     
\f3\fP
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.sp     
.SH SEE\ ALSO    
.TP 0.2i    
\(bu
orbd(1)
.RE
.br
'pl 8.5i
'bp