LocateRegistry is used to obtain a reference to a bootstrap
+ * remote object registry on a particular host (including the local host), or
+ * to create a remote object registry that accepts calls on a specific port.
+ *
+ * Note that a getRegistry call does not actually make a
+ * connection to the remote host. It simply creates a local reference to
+ * the remote registry and will succeed even if no registry is running on
+ * the remote host. Therefore, a subsequent method invocation to a remote
+ * registry returned as a result of this method may fail.
+ *
+ * @author Ann Wollrath
+ * @author Peter Jones
+ * @since 1.1
+ * @see java.rmi.registry.Registry
+ */
+public final class LocateRegistry {
+
+ /**
+ * Private constructor to disable public construction.
+ */
+ private LocateRegistry() {}
+
+ /**
+ * Returns a reference to the remote object Registry for
+ * the local host on the default registry port of 1099.
+ *
+ * @return reference (a stub) to the remote object registry
+ * @exception RemoteException if the reference could not be created
+ * @since 1.1
+ */
+ public static Registry getRegistry()
+ throws RemoteException
+ {
+ return getRegistry(null, Registry.REGISTRY_PORT);
+ }
+
+ /**
+ * Returns a reference to the remote object Registry for
+ * the local host on the specified port.
+ *
+ * @param port port on which the registry accepts requests
+ * @return reference (a stub) to the remote object registry
+ * @exception RemoteException if the reference could not be created
+ * @since 1.1
+ */
+ public static Registry getRegistry(int port)
+ throws RemoteException
+ {
+ return getRegistry(null, port);
+ }
+
+ /**
+ * Returns a reference to the remote object Registry on the
+ * specified host on the default registry port of 1099. If
+ * host is null, the local host is used.
+ *
+ * @param host host for the remote registry
+ * @return reference (a stub) to the remote object registry
+ * @exception RemoteException if the reference could not be created
+ * @since 1.1
+ */
+ public static Registry getRegistry(String host)
+ throws RemoteException
+ {
+ return getRegistry(host, Registry.REGISTRY_PORT);
+ }
+
+ /**
+ * Returns a reference to the remote object Registry on the
+ * specified host and port. If host
+ * is null, the local host is used.
+ *
+ * @param host host for the remote registry
+ * @param port port on which the registry accepts requests
+ * @return reference (a stub) to the remote object registry
+ * @exception RemoteException if the reference could not be created
+ * @since 1.1
+ */
+ public static Registry getRegistry(String host, int port)
+ throws RemoteException
+ {
+ return getRegistry(host, port, null);
+ }
+
+ /**
+ * Returns a locally created remote reference to the remote object
+ * Registry on the specified host and
+ * port. Communication with this remote registry will
+ * use the supplied RMIClientSocketFactory csf
+ * to create Socket connections to the registry on the
+ * remote host and port.
+ *
+ * @param host host for the remote registry
+ * @param port port on which the registry accepts requests
+ * @param csf client-side Socket factory used to
+ * make connections to the registry. If csf
+ * is null, then the default client-side Socket
+ * factory will be used in the registry stub.
+ * @return reference (a stub) to the remote registry
+ * @exception RemoteException if the reference could not be created
+ * @since 1.2
+ */
+ public static Registry getRegistry(String host, int port,
+ RMIClientSocketFactory csf)
+ throws RemoteException
+ {
+ Registry registry = null;
+
+ if (port <= 0)
+ port = Registry.REGISTRY_PORT;
+
+ if (host == null || host.length() == 0) {
+ // If host is blank (as returned by "file:" URL in 1.0.2 used in
+ // java.rmi.Naming), try to convert to real local host name so
+ // that the RegistryImpl's checkAccess will not fail.
+ try {
+ host = java.net.InetAddress.getLocalHost().getHostAddress();
+ } catch (Exception e) {
+ // If that failed, at least try "" (localhost) anyway...
+ host = "";
+ }
+ }
+
+ /*
+ * Create a proxy for the registry with the given host, port, and
+ * client socket factory. If the supplied client socket factory is
+ * null, then the ref type is a UnicastRef, otherwise the ref type
+ * is a UnicastRef2. If the property
+ * java.rmi.server.ignoreStubClasses is true, then the proxy
+ * returned is an instance of a dynamic proxy class that implements
+ * the Registry interface; otherwise the proxy returned is an
+ * instance of the pregenerated stub class for RegistryImpl.
+ **/
+ LiveRef liveRef =
+ new LiveRef(new ObjID(ObjID.REGISTRY_ID),
+ new TCPEndpoint(host, port, csf, null),
+ false);
+ RemoteRef ref =
+ (csf == null) ? new UnicastRef(liveRef) : new UnicastRef2(liveRef);
+
+ return (Registry) Util.createProxy(RegistryImpl.class, ref, false);
+ }
+
+ /**
+ * Creates and exports a Registry instance on the local
+ * host that accepts requests on the specified port.
+ *
+ *
The Registry instance is exported as if the static
+ * {@link UnicastRemoteObject#exportObject(Remote,int)
+ * UnicastRemoteObject.exportObject} method is invoked, passing the
+ * Registry instance and the specified port as
+ * arguments, except that the Registry instance is
+ * exported with a well-known object identifier, an {@link ObjID}
+ * instance constructed with the value {@link ObjID#REGISTRY_ID}.
+ *
+ * @param port the port on which the registry accepts requests
+ * @return the registry
+ * @exception RemoteException if the registry could not be exported
+ * @since 1.1
+ **/
+ public static Registry createRegistry(int port) throws RemoteException {
+ return new RegistryImpl(port);
+ }
+
+ /**
+ * Creates and exports a Registry instance on the local
+ * host that uses custom socket factories for communication with that
+ * instance. The registry that is created listens for incoming
+ * requests on the given port using a
+ * ServerSocket created from the supplied
+ * RMIServerSocketFactory.
+ *
+ *
The Registry instance is exported as if
+ * the static {@link
+ * UnicastRemoteObject#exportObject(Remote,int,RMIClientSocketFactory,RMIServerSocketFactory)
+ * UnicastRemoteObject.exportObject} method is invoked, passing the
+ * Registry instance, the specified port, the
+ * specified RMIClientSocketFactory, and the specified
+ * RMIServerSocketFactory as arguments, except that the
+ * Registry instance is exported with a well-known object
+ * identifier, an {@link ObjID} instance constructed with the value
+ * {@link ObjID#REGISTRY_ID}.
+ *
+ * @param port port on which the registry accepts requests
+ * @param csf client-side Socket factory used to
+ * make connections to the registry
+ * @param ssf server-side ServerSocket factory
+ * used to accept connections to the registry
+ * @return the registry
+ * @exception RemoteException if the registry could not be exported
+ * @since 1.2
+ **/
+ public static Registry createRegistry(int port,
+ RMIClientSocketFactory csf,
+ RMIServerSocketFactory ssf)
+ throws RemoteException
+ {
+ return new RegistryImpl(port, csf, ssf);
+ }
+}