class MyJob extends Job
{
    public MyJob(String name) {
        super(name);
    } 

    public IStatus run(IProgressMonitor monitor){
            //SOME EXPENSIVE COMPUTATIONS
        BigInteger bigint = new BigInteger("0");
        for ( int i=0 ; i<100 ; i++ ) {
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            bigint = bigint.add(new BigInteger(Integer.toString(i)));
        }
        monitor.done();

        return new  Status(IStatus.OK, "foo", "OK");
    }
}