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 {@link
java.rmi.server.ObjID#REGISTRY_ID ObjID} and TCP port number
(default is {@link #REGISTRY_PORT 1099}).
The {@link 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 {@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.
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. | 