Java 2 Platform SE v1.3.1: Interface Registry

For obtaining references to remote objects, RMI provides a simple remote object registry interface, implemented by RMI's rmiregistry, that provides methods for storing and retrieving remote object references. The java.rmi.Naming class provides methods to access a remote object registry using URL-formatted names to specify in a compact format both the remote registry along with the name for the remote object.

Typically a "registry" exists on every node that allows RMI connections to servers on that node. A registry on a particular node contains a transient database that maps names to remote objects. When a registry starts up, the registry database is empty. The names stored in the registry are pure and are not parsed. A service storing itself in the registry may want to prefix its name of the service by a package name (although not required), to reduce name collisions in the registry.

To create a registry that runs in an application, use one of the LocateRegistry.createRegistry methods. To obtain a reference to a remote object registry, use one of the LocateRegistry.getRegistry methods.

Since:: JDK1.1
See Also:: Naming, LocateRegistry

Field Summary

static int REGISTRY_PORT
          Well known port for registry.

Method Summary

void bind(String name, Remote obj)
          Binds the specified name to a remote object.

String[] list()
          Returns an array of the names bound in the registry.

Remote lookup(String name)
          Returns a reference, a stub, for the remote object associated with the specified name.

void rebind(String name, Remote obj)
          Rebinds the specified name to a new remote object.

void unbind(String name)
          Destroys the binding for the specified name that is associated with a remote object.

Field Detail

REGISTRY_PORT

public static final int REGISTRY_PORT

Well known port for registry.

Method Detail

lookup

public Remote lookup(String name)
              throws RemoteException,
                     NotBoundException,
                     AccessException

Returns a reference, a stub, for the remote object associated with the specified name.

Parameters:: name - a URL-formatted name for the remote object
Returns:: a reference for a remote object
Throws:: NotBoundException - if name is not currently bound; RemoteException - if registry could not be contacted; AccessException - if this operation is not permitted (if originating from a non-local host, for example)
Since:: JDK1.1

bind

public void bind(String name,
                 Remote obj)
          throws RemoteException,
                 AlreadyBoundException,
                 AccessException

Binds the specified name to a remote object.

Parameters:: name - a URL-formatted name for the remote object; obj - a reference for the remote object (usually a stub)
Throws:: AlreadyBoundException - if name is already bound; MalformedURLException - if the name is not an appropriately formatted URL; RemoteException - if registry could not be contacted; AccessException - if this operation is not permitted (if originating from a non-local host, for example)
Since:: JDK1.1

unbind

public void unbind(String name)
            throws RemoteException,
                   NotBoundException,
                   AccessException

Destroys the binding for the specified name that is associated with a remote object.

Parameters:: name - a URL-formatted name associated with a remote object
Throws:: NotBoundException - if name is not currently bound; MalformedURLException - if the name is not an appropriately formatted URL; RemoteException - if registry could not be contacted; AccessException - if this operation is not permitted (if originating from a non-local host, for example)
Since:: JDK1.1

rebind

public void rebind(String name,
                   Remote obj)
            throws RemoteException,
                   AccessException

Rebinds the specified name to a new remote object. Any existing binding for the name is replaced.

Parameters:: name - a URL-formatted name associated with the remote object; obj - new remote object to associate with the name
Throws:: MalformedURLException - if the name is not an appropriately formatted URL; RemoteException - if registry could not be contacted; AccessException - if this operation is not permitted (if originating from a non-local host, for example)
Since:: JDK1.1

list

public String[] list()
              throws RemoteException,
                     AccessException

Returns an array of the names bound in the registry. The names are URL-formatted strings. The array contains a snapshot of the names present in the registry at the time of the call.

Returns:: an array of names (in the appropriate URL format) bound in the registry
Throws:: RemoteException - if registry could not be contacted; AccessException - if this operation is not permitted (if originating from a non-local host, for example)
Since:: JDK1.1

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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