Package ucb.util

Class SimpleObjectRegistry

java.lang.Object

ucb.util.SimpleObjectRegistry

public class SimpleObjectRegistry
extends Object

A kind of registry that provides a very simple means of exchanging remote objects by name. One can create a registry, allowing the constructor to select an available port. One can find a bound object by name over a sequence of port numbers and hosts.

Field Summary

Fields

Modifier and Type	Field	Description
static int	DEFAULT_HIGH_PORT	The default values for LOWPORT and HIGHPORT arguments.
static int	DEFAULT_LOW_PORT	The default values for LOWPORT and HIGHPORT arguments.
static int	DEFAULT_PORTS	The default values for LOWPORT and HIGHPORT arguments.

Constructor Summary

Constructors

Constructor	Description
SimpleObjectRegistry()	Same as SimpleObjectRegistry(DEFAULT_LOW_PORT, DEFAULT_HIGH_PORT).
SimpleObjectRegistry(int port)	Return SimpleObjectRegistry(PORT, PORT).
SimpleObjectRegistry(int lowPort, int highPort)	Create a new SimpleObjectRegistry on one of the ports LOWPORT to HIGHPORT, if possible.

Method Summary

Modifier and Type	Method	Description
void	close()	Remove all bindings from this registry, and disable it from further use.
static Remote	findObject(String name, String host)	Return findObject(NAME, HOST, DEFAULT_LOW_PORT, DEFAULT_HIGH_PORT).
static Remote	findObject(String name, String[] hosts)	Return findObject(NAME, HOSTS, DEFAULT_LOW_PORT, DEFAULT_HIGH_PORT).
static Remote	findObject(String name, String[] hosts, int lowPort, int highPort)	Return a remote object named NAME in some registry on one of the hosts in HOSTS on some port number between LOWPORT and HIGHPORT.
static Remote	findObject(String name, String host, int lowPort, int highPort)	Return a remote object named NAME in some registry on HOST on some port number between LOWPORT and HIGHPORT.
int	port()	Return the port number on which this registry is exported.
void	rebind(String name, Remote value)	Bind NAME to VALUE in this registry, replacing any existing binding.
void	unbind()	Remove all bindings in this registry.
void	unbind(String name)	Remove any binding of NAME in this registry.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DEFAULT_PORTS

public static final int DEFAULT_PORTS

The default values for LOWPORT and HIGHPORT arguments.

See Also:

Constant Field Values

DEFAULT_LOW_PORT

public static final int DEFAULT_LOW_PORT

The default values for LOWPORT and HIGHPORT arguments.

See Also:

Constant Field Values

DEFAULT_HIGH_PORT

public static final int DEFAULT_HIGH_PORT

The default values for LOWPORT and HIGHPORT arguments.

See Also:

Constant Field Values

Constructor Detail

SimpleObjectRegistry

public SimpleObjectRegistry(int lowPort,
                            int highPort)
                     throws RemoteException

Create a new SimpleObjectRegistry on one of the ports LOWPORT to HIGHPORT, if possible. Throws RemoteException if no registry can be created on any of these ports.

Throws:

RemoteException

SimpleObjectRegistry

public SimpleObjectRegistry(int port)
                     throws RemoteException

Return SimpleObjectRegistry(PORT, PORT).

Throws:

RemoteException

SimpleObjectRegistry

public SimpleObjectRegistry()
                     throws RemoteException

Same as SimpleObjectRegistry(DEFAULT_LOW_PORT, DEFAULT_HIGH_PORT).

Throws:

RemoteException

Method Detail

findObject

public static Remote findObject(String name,
                                String host,
                                int lowPort,
                                int highPort)
                         throws NotBoundException

Return a remote object named NAME in some registry on HOST on some port number between LOWPORT and HIGHPORT. Throws NotBoundException if no such object is found for whatever reason (i.e., either because no registry is found or because NAME is unbound on all such registries.)

Throws:

NotBoundException

findObject

public static Remote findObject(String name,
                                String host)
                         throws NotBoundException

Return findObject(NAME, HOST, DEFAULT_LOW_PORT, DEFAULT_HIGH_PORT).

Throws:

NotBoundException

findObject

public static Remote findObject(String name,
                                String[] hosts,
                                int lowPort,
                                int highPort)
                         throws NotBoundException

Return a remote object named NAME in some registry on one of the hosts in HOSTS on some port number between LOWPORT and HIGHPORT. Throws NotBoundException if no such object is found for whatever reason (i.e., either because no registry is found or because NAME is unbound on all such registries.)

Throws:

NotBoundException

findObject

public static Remote findObject(String name,
                                String[] hosts)
                         throws NotBoundException

Return findObject(NAME, HOSTS, DEFAULT_LOW_PORT, DEFAULT_HIGH_PORT).

Throws:

NotBoundException

port

public int port()

Return the port number on which this registry is exported.

rebind

public void rebind(String name,
                   Remote value)

Bind NAME to VALUE in this registry, replacing any existing binding.

unbind

public void unbind(String name)

Remove any binding of NAME in this registry.

unbind

public void unbind()

Remove all bindings in this registry.

close

public void close()

Remove all bindings from this registry, and disable it from further use.