russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
192 lines
8.3 KiB
Java
192 lines
8.3 KiB
Java
/*
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* Copyright (c) 1996, 2001, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.rmi.registry;
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import java.rmi.AccessException;
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import java.rmi.AlreadyBoundException;
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import java.rmi.NotBoundException;
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import java.rmi.Remote;
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import java.rmi.RemoteException;
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/**
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* <code>Registry</code> is a remote interface to a simple remote
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* object registry that provides methods for storing and retrieving
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* remote object references bound with arbitrary string names. The
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* <code>bind</code>, <code>unbind</code>, and <code>rebind</code>
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* methods are used to alter the name bindings in the registry, and
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* the <code>lookup</code> and <code>list</code> methods are used to
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* query the current name bindings.
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*
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* <p>In its typical usage, a <code>Registry</code> enables RMI client
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* bootstrapping: it provides a simple means for a client to obtain an
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* initial reference to a remote object. Therefore, a registry's
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* remote object implementation is typically exported with a
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* well-known address, such as with a well-known {@link
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* java.rmi.server.ObjID#REGISTRY_ID ObjID} and TCP port number
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* (default is {@link #REGISTRY_PORT 1099}).
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*
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* <p>The {@link LocateRegistry} class provides a programmatic API for
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* constructing a bootstrap reference to a <code>Registry</code> at a
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* remote address (see the static <code>getRegistry</code> methods)
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* and for creating and exporting a <code>Registry</code> in the
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* current VM on a particular local address (see the static
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* <code>createRegistry</code> methods).
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*
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* <p>A <code>Registry</code> implementation may choose to restrict
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* access to some or all of its methods (for example, methods that
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* mutate the registry's bindings may be restricted to calls
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* originating from the local host). If a <code>Registry</code>
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* method chooses to deny access for a given invocation, its
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* implementation may throw {@link java.rmi.AccessException}, which
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* (because it extends {@link java.rmi.RemoteException}) will be
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* wrapped in a {@link java.rmi.ServerException} when caught by a
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* remote client.
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*
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* <p>The names used for bindings in a <code>Registry</code> are pure
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* strings, not parsed. A service which stores its remote reference
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* in a <code>Registry</code> may wish to use a package name as a
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* prefix in the name binding to reduce the likelihood of name
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* collisions in the registry.
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*
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* @author Ann Wollrath
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* @author Peter Jones
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* @since 1.1
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* @see LocateRegistry
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*/
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public interface Registry extends Remote {
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/** Well known port for registry. */
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public static final int REGISTRY_PORT = 1099;
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/**
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* Returns the remote reference bound to the specified
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* <code>name</code> in this registry.
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*
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* @param name the name for the remote reference to look up
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*
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* @return a reference to a remote object
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*
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* @throws NotBoundException if <code>name</code> is not currently bound
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*
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* @throws RemoteException if remote communication with the
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* registry failed; if exception is a <code>ServerException</code>
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* containing an <code>AccessException</code>, then the registry
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* denies the caller access to perform this operation
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*
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* @throws AccessException if this registry is local and it denies
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* the caller access to perform this operation
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*
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* @throws NullPointerException if <code>name</code> is <code>null</code>
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*/
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public Remote lookup(String name)
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throws RemoteException, NotBoundException, AccessException;
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/**
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* Binds a remote reference to the specified <code>name</code> in
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* this registry.
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*
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* @param name the name to associate with the remote reference
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* @param obj a reference to a remote object (usually a stub)
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*
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* @throws AlreadyBoundException if <code>name</code> is already bound
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*
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* @throws RemoteException if remote communication with the
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* registry failed; if exception is a <code>ServerException</code>
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* containing an <code>AccessException</code>, then the registry
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* denies the caller access to perform this operation (if
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* originating from a non-local host, for example)
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*
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* @throws AccessException if this registry is local and it denies
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* the caller access to perform this operation
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*
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* @throws NullPointerException if <code>name</code> is
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* <code>null</code>, or if <code>obj</code> is <code>null</code>
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*/
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public void bind(String name, Remote obj)
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throws RemoteException, AlreadyBoundException, AccessException;
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/**
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* Removes the binding for the specified <code>name</code> in
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* this registry.
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*
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* @param name the name of the binding to remove
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*
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* @throws NotBoundException if <code>name</code> is not currently bound
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*
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* @throws RemoteException if remote communication with the
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* registry failed; if exception is a <code>ServerException</code>
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* containing an <code>AccessException</code>, then the registry
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* denies the caller access to perform this operation (if
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* originating from a non-local host, for example)
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*
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* @throws AccessException if this registry is local and it denies
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* the caller access to perform this operation
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*
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* @throws NullPointerException if <code>name</code> is <code>null</code>
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*/
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public void unbind(String name)
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throws RemoteException, NotBoundException, AccessException;
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/**
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* Replaces the binding for the specified <code>name</code> in
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* this registry with the supplied remote reference. If there is
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* an existing binding for the specified <code>name</code>, it is
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* discarded.
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*
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* @param name the name to associate with the remote reference
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* @param obj a reference to a remote object (usually a stub)
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*
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* @throws RemoteException if remote communication with the
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* registry failed; if exception is a <code>ServerException</code>
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* containing an <code>AccessException</code>, then the registry
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* denies the caller access to perform this operation (if
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* originating from a non-local host, for example)
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*
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* @throws AccessException if this registry is local and it denies
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* the caller access to perform this operation
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*
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* @throws NullPointerException if <code>name</code> is
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* <code>null</code>, or if <code>obj</code> is <code>null</code>
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*/
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public void rebind(String name, Remote obj)
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throws RemoteException, AccessException;
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/**
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* Returns an array of the names bound in this registry. The
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* array will contain a snapshot of the names bound in this
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* registry at the time of the given invocation of this method.
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*
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* @return an array of the names bound in this registry
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*
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* @throws RemoteException if remote communication with the
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* registry failed; if exception is a <code>ServerException</code>
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* containing an <code>AccessException</code>, then the registry
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* denies the caller access to perform this operation
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*
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* @throws AccessException if this registry is local and it denies
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* the caller access to perform this operation
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*/
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public String[] list() throws RemoteException, AccessException;
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}
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