orbd Man page

orbd Java IDL and RMI-IIOP Tools orbd

NAME

orbd – Enables clients to locate and call persistent objects on servers
in the CORBA environment.

SYNOPSIS

orbd [ options ]

options
Command-line options. See Options.

DESCRIPTION

The orbd command enables clients to transparently locate and call
persistent objects on servers in the CORBA environment. The Server
Manager included with the orbd tool is used to enable clients to
transparently locate and call persistent objects on servers in the
CORBA environment. The persistent servers, while publishing the
persistent object references in the naming service, include the port
number of the ORBD in the object reference instead of the port number
of the server. The inclusion of an ORBD port number in the object
reference for persistent object references has the following
advantages:

· The object reference in the naming service remains independent of the
server life cycle. For example, the object reference could be
published by the server in the Naming Service when it is first
installed, and then, independent of how many times the server is
started or shut down, the ORBD returns the correct object reference
to the calling client.

· The client needs to look up the object reference in the naming
service only once, and can keep reusing this reference independent of
the changes introduced due to server life cycle.

To access the ORBD Server Manager, the server must be started using
servertool, which is a command-line interface for application
programmers to register, unregister, start up, and shut down a
persistent server. For more information on the Server Manager, see
Server Manager.

When orbd starts, it also starts a naming service. For more information
about the naming service. See Start and Stop the Naming Service.

OPTIONS

-ORBInitialPort nameserverport
Required. Specifies the port on which the name server should be
started. After it is started, orbd listens for incoming requests
on this port. On Oracle Solaris software, you must become the
root user to start a process on a port below 1024. For this
reason, Oracle recommends that you use a port number above or
equal to 1024.

NONREQUIRED

OPTIONS

-port port
Specifies the activation port where ORBD should be started, and
where ORBD will be accepting requests for persistent objects.
The default value for this port is 1049. This port number is
added to the port field of the persistent Interoperable Object
References (IOR).

-defaultdb directory
Specifies the base where the ORBD persistent storage directory,
orb.db, is created. If this option is not specified, then the
default value is ./orb.db.

-serverPollingTime milliseconds
Specifies how often ORBD checks for the health of persistent
servers registered through servertool. The default value is 1000
ms. The value specified for milliseconds must be a valid
positive integer.

-serverStartupDelay milliseconds
Specifies how long ORBD waits before sending a location forward
exception after a persistent server that is registered through
servertool is restarted. The default value is 1000 ms. The value
specified for milliseconds must be a valid positive integer.

-Joption
Passes option to the Java Virtual Machine, where option is one
of the options described on the reference page for the Java
application launcher. For example, -J-Xms48m sets the startup
memory to 48 MB. See java.

START AND STOP THE NAMING SERVICE
A naming service is a CORBA service that allows CORBA objects to be
named by means of binding a name to an object reference. The name
binding can be stored in the naming service, and a client can supply
the name to obtain the desired object reference.

Before running a client or a server, you will start ORBD. ORBD includes
a persistent naming service and a transient naming service, both of
which are an implementation of the COS Naming Service.

The Persistent Naming Service provides persistence for naming contexts.
This means that this information is persistent across service shutdowns
and startups, and is recoverable in the event of a service failure. If
ORBD is restarted, then the Persistent Naming Service restores the
naming context graph, so that the binding of all clients’ and servers’
names remains intact (persistent).

For backward compatibility, tnameserv, a Transient Naming Service that
shipped with earlier releases of the JDK, is also included in this
release of Java SE. A transient naming service retains naming contexts
as long as it is running. If there is a service interruption, then the
naming context graph is lost.

The -ORBInitialPort argument is a required command-line argument for
orbd, and is used to set the port number on which the naming service
runs. The following instructions assume you can use port 1050 for the
Java IDL Object Request Broker Daemon. When using Oracle Solaris
software, you must become a root user to start a process on a port
lower than 1024. For this reason, it is recommended that you use a port
number above or equal to 1024. You can substitute a different port when
necessary.

To start orbd from a UNIX command shell, enter:

orbd -ORBInitialPort 1050&

From an MS-DOS system prompt (Windows), enter:

start orbd -ORBInitialPort 1050

Now that ORBD is running, you can run your server and client
applications. When running the client and server applications, they
must be made aware of the port number (and machine name, when
applicable) where the Naming Service is running. One way to do this is
to add the following code to your application:

Properties props = new Properties();
props.put(“org.omg.CORBA.ORBInitialPort”, “1050”);
props.put(“org.omg.CORBA.ORBInitialHost”, “MyHost”);
ORB orb = ORB.init(args, props);

In this example, the naming service is running on port 1050 on host
MyHost. Another way is to specify the port number and/or machine name
when running the server or client application from the command line.
For example, you would start your HelloApplication with the following
command line:

java HelloApplication -ORBInitialPort 1050 -ORBInitialHost MyHost

To stop the naming service, use the relevant operating system command,
such as pkillorbd on Oracle Solaris, or Ctrl+C in the DOS window in
which orbd is running. Note that names registered with the naming
service can disappear when the service is terminated because of a
transient naming service. The Java IDL naming service will run until it
is explicitly stopped.

For more information about the naming service included with ORBD, see
Naming Service at
http://docs.oracle.com/javase/8/docs/technotes/guides/idl/jidlNaming.html

SERVER MANAGER
To access the ORBD Server Manager and run a persistent server, the
server must be started with servertool, which is a command-line
interface for application programmers to register, unregister, start
up, and shut down a persistent server. When a server is started using
servertool, it must be started on the same host and port on which orbd
is executing. If the server is run on a different port, then the
information stored in the database for local contexts will be invalid
and the service will not work properly.

See Java IDL: The “Hello World” Example at
http://docs.oracle.com/javase/8/docs/technotes/guides/idl/jidlExample.html

In this example, you run the idlj compiler and javac compiler as shown
in the tutorial. To run the ORBD Server Manager, follow these steps for
running the application:

Start orbd.

UNIX command shell, enter: orbd -ORBInitialPort 1050.

MS-DOS system prompt (Windows), enter: start orbd -ORBInitialPort 1050.

Port 1050 is the port on which you want the name server to run. The
-ORBInitialPort option is a required command-line argument. When using
Oracle Solaris software, you must become a root user to start a process
on a port below 1024. For this reason, it is recommended that you use a
port number above or equal to 1024.

Start the servertool: servertool -ORBInitialPort 1050.

Make sure the name server (orbd) port is the same as in the previous
step, for example, -ORBInitialPort 1050. The servertool must be started
on the same port as the name server.

In the servertool command line interface, start the Hello server from
the servertool prompt:

servertool > register -server HelloServer -classpath . -applicationName
HelloServerApName

The servertool registers the server, assigns it the name
HelloServerApName, and displays its server ID with a listing of all
registered servers.Run the client application from another terminal
window or prompt:

java HelloClient -ORBInitialPort 1050 -ORBInitialHost localhost

For this example, you can omit -ORBInitialHost localhost because the
name server is running on the same host as the Hello client. If the
name server is running on a different host, then use the
-ORBInitialHost nameserverhost option to specify the host on which the
IDL name server is running.Specify the name server (orbd) port as done
in the previous step, for example, -ORBInitialPort 1050. When you
finish experimenting with the ORBD Server Manager, be sure to shut down
or terminate the name server (orbd) and servertool. To shut down orbd
from am MS-DOS prompt, select the window that is running the server and
enter Ctrl+C to shut it down.

To shut down orbd from an Oracle Solaris shell, find the process, and
terminate with the kill command. The server continues to wait for
invocations until it is explicitly stopped. To shut down the
servertool, type quit and press the Enter key.

SEE ALSO

· servertool

· Naming Service at
http://docs.oracle.com/javase/8/docs/technotes/guides/idl/jidlNaming.html

JDK 8 21 November 2013 orbd

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