RMI allows for remote method invocation, making remote objects appear local to clients. It handles threading, sockets, object marshalling between client and server JVMs. The client looks up remote objects in the RMI registry and calls methods which are executed on server object skeletons. Return values pass through stubs back to the client. Advantages include automatic threading and marshalling, dynamic class loading. Disadvantages are that RMI only works with Java and security must be closely monitored.

1. REMOTE METHOD INVOCATION
(RMI)
Presented by:-
SARFARAZ HUSAIN
1305010334
MCA 5TH SEM

2. RMI....
1. What is RMI ?
2. Important compomnent of RMI
3. RMI Stub and Skeleton
4. RMI Advantages
5. RMI Disadvanteges

3. What is RMI ?
RMI is a lightweight java technology that provides access
to remote methods, similar to RPC, but Object-
Oriented.RMI provides remote object access for a client
and object registration for servers.
RMI is a Java Technology since it requires that client and
server objects run in a JVM. By using IIOP(Internet Inter-
ORB Protocol) transport protocol, however, it is possible
to connect RMI-clients to non-java server objects(CORBA).
CLIENT SERVERRMI

4. Important compomnent of RMI
Client:-
The clients lookup a remote object and calls methods on the obtained
remote object.
Object:-
The server registeres itself in the RMI registry and accepts method
invocations from yhe client.
RMI Registry:-
The registry is the remote object lookup service.The Registry may run
on the same host as the server or on a different host.The registry can
also be a JNDI server.
Web server:-
A plain venilla HTTP sever may hold remote object classes for
downloading by the client.

5. RMI Stub and Skeleton
Stub:-
1.It Iinitiates a connection with remote Virtual Machine (JVM),
2.It writes and transmits (marshals) the parameters to the remote Virtual Machine
3.It waits for the result
4.It reads (unmarshals) the return value or exception, and
5.It finally, returns the value to the caller.
Skeleton:-
1.It reads the parameter for the remote method
2.It invokes the method on the actual remote object, and
3.It writes and transmits (marshals) the result to the caller.

6. Advantages of RMI
1. Handles threads for you
2. Handles Sockets for you
3. Nice GC of lost clients. ie Unreferenced
4. Marshalls objects for you
5. Dynamic loading of classes are available.
6. Can also make changes on the server end, that
might not mean you need to change anything on the
client side.

7. Disadvantages of RMI
1. Strictly Java Cannot use with other code outside Java
2. Cannot guarantee that a client will always use the
same thread in consecutive calls. Meaning you need to
write a mechanism for identifying the client yourself
3. I think it is more Hackable, security needs to be
monitored more closely.
See I always get stuck with the disadvatages. I can come
up with 2 good ones, and falter on a third.

8. THANKs