scala-rmi-example

Background

I wanted to learn a bit of Scala, and I had a quick uni assignment that needed to demo some RMI code so I decided to whip up a small sample.

It's not a particularly user friendly application, or good GUI interface, but it demonstrates a simple YML configuration file parser and a simple RMI protocol which involves a collection class (Evaluator) which authenticates students and then passes a serialized Student class over RMI to do some basic grading and student result evaluation.

Some of the technologies used here:

Apache commons codec (SHA1, EncodeHex)
SnakeYAML YAML parser
Java RMI

Building

You'll need the following jar files in the lib directory:

commons-codec-1.5.jar
scala-library.jar
snakeyaml-1.8.jar

The scala-library.jar should come from your particular version of scala. There is a makefile for the client and server, which can be executed with the small shell scripts provided.

Running

The command line to run each program is as follows:

Server:

java -Djava.security.policy=../common/no.policy -jar server.jar

Client:

java -Djava.rmi.server.codebase=http://127.0.0.1/~john/server.jar -Djava.security.policy=../common/no.policy -jar client.jar

As seen in the client command line, you'll need to specify a codebase repository to download the serialized StudentImpl class. In the code I've used a simple local Apache server hosting the server.jar file in my home directory.

Note that the policy specified here is a simple permit all policy, you may prefer to set a more restrictive one.

Configuration

Both the client and server have their own configuration file which is a simple YAML format like so for the server:

settings:
  service_address: 127.0.0.1
  service_name: evaluator
  port: 32717

students:
  john:
    studentid: 0991300
    password: 0c7cc0fdbb9aaeab4f408f9ad1cfcacdcd85474c
    salt: D458728A0BBFB530EE

The password in this example is 'password'.

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