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package java.rmi.registry;

import java.rmi.AccessException;
import java.rmi.AlreadyBoundException;
import java.rmi.NotBoundException;
import java.rmi.Remote;
import java.rmi.RemoteException;


Registry is a remote interface to a simple remote
object registry that provides methods for storing and retrieving
remote object references bound with arbitrary string names.  The
bind, unbind, and rebind
methods are used to alter the name bindings in the registry, and
the lookup and list methods are used to
query the current name bindings.

In its typical usage, a Registry enables RMI client bootstrapping: it provides a simple means for a client to obtain an initial reference to a remote object. Therefore, a registry's remote object implementation is typically exported with a well-known address, such as with a well-known ObjID and TCP port number (default is 1099). 
The LocateRegistry class provides a programmatic API for constructing a bootstrap reference to a Registry at a
remote address (see the static getRegistry methods)
and for creating and exporting a Registry in the
current VM on a particular local address (see the static
createRegistry methods).

A Registry implementation may choose to restrict
access to some or all of its methods (for example, methods that
mutate the registry's bindings may be restricted to calls
originating from the local host).  If a Registry method chooses to deny access for a given invocation, its implementation may throw AccessException, which (because it extends RemoteException) will be wrapped in a ServerException when caught by a remote client. 
The names used for bindings in a Registry are pure
strings, not parsed.  A service which stores its remote reference
in a Registry may wish to use a package name as a
prefix in the name binding to reduce the likelihood of name
collisions in the registry.

Author:     Ann Wollrath,      Peter Jones
See Also:
Since:      1.1
/**
 * <code>Registry</code> is a remote interface to a simple remote
 * object registry that provides methods for storing and retrieving
 * remote object references bound with arbitrary string names.  The
 * <code>bind</code>, <code>unbind</code>, and <code>rebind</code>
 * methods are used to alter the name bindings in the registry, and
 * the <code>lookup</code> and <code>list</code> methods are used to
 * query the current name bindings.
 *
 * <p>In its typical usage, a <code>Registry</code> enables RMI client
 * bootstrapping: it provides a simple means for a client to obtain an
 * initial reference to a remote object.  Therefore, a registry's
 * remote object implementation is typically exported with a
 * well-known address, such as with a well-known {@link
 * java.rmi.server.ObjID#REGISTRY_ID ObjID} and TCP port number
 * (default is {@link #REGISTRY_PORT 1099}).
 *
 * <p>The {@link LocateRegistry} class provides a programmatic API for
 * constructing a bootstrap reference to a <code>Registry</code> at a
 * remote address (see the static <code>getRegistry</code> methods)
 * and for creating and exporting a <code>Registry</code> in the
 * current VM on a particular local address (see the static
 * <code>createRegistry</code> methods).
 *
 * <p>A <code>Registry</code> implementation may choose to restrict
 * access to some or all of its methods (for example, methods that
 * mutate the registry's bindings may be restricted to calls
 * originating from the local host).  If a <code>Registry</code>
 * method chooses to deny access for a given invocation, its
 * implementation may throw {@link java.rmi.AccessException}, which
 * (because it extends {@link java.rmi.RemoteException}) will be
 * wrapped in a {@link java.rmi.ServerException} when caught by a
 * remote client.
 *
 * <p>The names used for bindings in a <code>Registry</code> are pure
 * strings, not parsed.  A service which stores its remote reference
 * in a <code>Registry</code> may wish to use a package name as a
 * prefix in the name binding to reduce the likelihood of name
 * collisions in the registry.
 *
 * @author      Ann Wollrath
 * @author      Peter Jones
 * @since       1.1
 * @see         LocateRegistry
 */
public interface Registry extends Remote {

    
Well known port for registry. 
/** Well known port for registry. */
    public static final int REGISTRY_PORT = 1099;

    
Returns the remote reference bound to the specified
name in this registry.

Params:
  • name – the name for the remote reference to look up
Throws:
  • NotBoundException – if name is not currently bound
  • RemoteException – if remote communication with the
registry failed; if exception is a ServerException
containing an AccessException, then the registry
denies the caller access to perform this operation
  • AccessException – if this registry is local and it denies
the caller access to perform this operation
  • NullPointerException – if name is null
Returns: a reference to a remote object
/**
     * Returns the remote reference bound to the specified
     * <code>name</code> in this registry.
     *
     * @param   name the name for the remote reference to look up
     *
     * @return  a reference to a remote object
     *
     * @throws  NotBoundException if <code>name</code> is not currently bound
     *
     * @throws  RemoteException if remote communication with the
     * registry failed; if exception is a <code>ServerException</code>
     * containing an <code>AccessException</code>, then the registry
     * denies the caller access to perform this operation
     *
     * @throws  AccessException if this registry is local and it denies
     * the caller access to perform this operation
     *
     * @throws  NullPointerException if <code>name</code> is <code>null</code>
     */
    public Remote lookup(String name)
        throws RemoteException, NotBoundException, AccessException;

    
Binds a remote reference to the specified name in
this registry.

Params:
  • name – the name to associate with the remote reference
  • obj – a reference to a remote object (usually a stub)
Throws:
  • AlreadyBoundException – if name is already bound
  • RemoteException – if remote communication with the
registry failed; if exception is a ServerException
containing an AccessException, then the registry
denies the caller access to perform this operation (if
originating from a non-local host, for example)
  • AccessException – if this registry is local and it denies
the caller access to perform this operation
  • NullPointerException – if name is
null, or if obj is null
/**
     * Binds a remote reference to the specified <code>name</code> in
     * this registry.
     *
     * @param   name the name to associate with the remote reference
     * @param   obj a reference to a remote object (usually a stub)
     *
     * @throws  AlreadyBoundException if <code>name</code> is already bound
     *
     * @throws  RemoteException if remote communication with the
     * registry failed; if exception is a <code>ServerException</code>
     * containing an <code>AccessException</code>, then the registry
     * denies the caller access to perform this operation (if
     * originating from a non-local host, for example)
     *
     * @throws  AccessException if this registry is local and it denies
     * the caller access to perform this operation
     *
     * @throws  NullPointerException if <code>name</code> is
     * <code>null</code>, or if <code>obj</code> is <code>null</code>
     */
    public void bind(String name, Remote obj)
        throws RemoteException, AlreadyBoundException, AccessException;

    
Removes the binding for the specified name in
this registry.

Params:
  • name – the name of the binding to remove
Throws:
  • NotBoundException – if name is not currently bound
  • RemoteException – if remote communication with the
registry failed; if exception is a ServerException
containing an AccessException, then the registry
denies the caller access to perform this operation (if
originating from a non-local host, for example)
  • AccessException – if this registry is local and it denies
the caller access to perform this operation
  • NullPointerException – if name is null
/**
     * Removes the binding for the specified <code>name</code> in
     * this registry.
     *
     * @param   name the name of the binding to remove
     *
     * @throws  NotBoundException if <code>name</code> is not currently bound
     *
     * @throws  RemoteException if remote communication with the
     * registry failed; if exception is a <code>ServerException</code>
     * containing an <code>AccessException</code>, then the registry
     * denies the caller access to perform this operation (if
     * originating from a non-local host, for example)
     *
     * @throws  AccessException if this registry is local and it denies
     * the caller access to perform this operation
     *
     * @throws  NullPointerException if <code>name</code> is <code>null</code>
     */
    public void unbind(String name)
        throws RemoteException, NotBoundException, AccessException;

    
Replaces the binding for the specified name in
this registry with the supplied remote reference.  If there is
an existing binding for the specified name, it is
discarded.

Params:
  • name – the name to associate with the remote reference
  • obj – a reference to a remote object (usually a stub)
Throws:
  • RemoteException – if remote communication with the
registry failed; if exception is a ServerException
containing an AccessException, then the registry
denies the caller access to perform this operation (if
originating from a non-local host, for example)
  • AccessException – if this registry is local and it denies
the caller access to perform this operation
  • NullPointerException – if name is
null, or if obj is null
/**
     * Replaces the binding for the specified <code>name</code> in
     * this registry with the supplied remote reference.  If there is
     * an existing binding for the specified <code>name</code>, it is
     * discarded.
     *
     * @param   name the name to associate with the remote reference
     * @param   obj a reference to a remote object (usually a stub)
     *
     * @throws  RemoteException if remote communication with the
     * registry failed; if exception is a <code>ServerException</code>
     * containing an <code>AccessException</code>, then the registry
     * denies the caller access to perform this operation (if
     * originating from a non-local host, for example)
     *
     * @throws  AccessException if this registry is local and it denies
     * the caller access to perform this operation
     *
     * @throws  NullPointerException if <code>name</code> is
     * <code>null</code>, or if <code>obj</code> is <code>null</code>
     */
    public void rebind(String name, Remote obj)
        throws RemoteException, AccessException;

    
Returns an array of the names bound in this registry.  The
array will contain a snapshot of the names bound in this
registry at the time of the given invocation of this method.

Throws:
  • RemoteException – if remote communication with the
registry failed; if exception is a ServerException
containing an AccessException, then the registry
denies the caller access to perform this operation
  • AccessException – if this registry is local and it denies
the caller access to perform this operation
Returns: an array of the names bound in this registry
/**
     * Returns an array of the names bound in this registry.  The
     * array will contain a snapshot of the names bound in this
     * registry at the time of the given invocation of this method.
     *
     * @return  an array of the names bound in this registry
     *
     * @throws  RemoteException if remote communication with the
     * registry failed; if exception is a <code>ServerException</code>
     * containing an <code>AccessException</code>, then the registry
     * denies the caller access to perform this operation
     *
     * @throws  AccessException if this registry is local and it denies
     * the caller access to perform this operation
     */
    public String[] list() throws RemoteException, AccessException;
}