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 JDK1.1
* @see java.rmi.registry.Registry
*/
public final class LocateRegistry {
/**
* Private constructor to disable public construction.
*/
private LocateRegistry() {}
/**
* Returns a reference to the 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 JDK1.1
*/
public static Registry getRegistry()
throws RemoteException
{
return getRegistry(null, Registry.REGISTRY_PORT);
}
/**
* Returns a reference to the 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 JDK1.1
*/
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 JDK1.1
*/
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 JDK1.1
*/
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 JDK1.1
**/
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);
}
}