RMI / Remote Method Invocation for Not Yet Techies

"Computer Careers: Using This Java Technology to Access Data and Files Across Networks"

by Richard Stooker, President Info Ring Press and author of Secrets of Changing to a Computer Career

Java RMI / Remote Method Invocation is Java's standard way of dealing with an aspect of computing that is increasingly common yet complex -- distributed computing for large organizations and networks. Running an entire business on one large mainframe computer is out of the question today, though legacy computers still exist. Now, large scale software programs run and interact on many different computers in separate locations on a network or across the Internet. Java RMI / Remote Method Invocation is designed to write efficient, fault-tolerant applications.

Java RMI / Remote Method Invocation works with:

Serialization
Threading
RMI Registry
Sockets and socket factories
Activation
Dynamic class downloading
HTTP tunneling
Distributed garbage collection
JNDI
CORBA

Java stream classes are in the java.io package and sockets (defined in the java.net package) allow two programs to communication by sending data in streams.

Java RMI / Remote Method Invocation and distributed applications have needs not met by the standard IP (Internet Protocol) network:

1. Confirmation that data sent to another location did arrive there.

2. Validation for receiving computer that the data received was valid.

3. Preservation of the order the data was sent.

It covers most of the infrastructure of Java distributed applications. Serialization is how it parses objects between JVMs (Java Virtual Machines).

When you put Java RMI / Remote Method Invocation on top of the CORBA technology you get RMI/IIOP - but that won't support distributed garbage collection (memory management)

Java RMI / Remote Method Invocation is their version of what's known generically as an RPC / Remote Procedure Call. It does assume that all machines are using Java programs.

When Java RMI / Remote Method Invocation communicates, it can also pass an object along with the request, making a change in the receiving computer. This is called "moving behavior" and can help catch errors early. Its object parameter-passing mechanism is known as object serialization.

Next: Regular Expressions

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