Chain of Responsibility in Java

public class ChainBefore {

    interface Image {

        String process();

    }

 

    static class IR implements Image {

        public String process() {

            return "IR";

        }

    }

 

    static class LS implements Image {

        public String process() {

            return "LS";

        }

    }

 

    static class Processor {

        private static java.util.Random rn = new java.util.Random();

        private static int nextId = 1;

        private int id = nextId++;

        public boolean handle( Image img ) {

            if (rn.nextInt(2) != 0) {

                System.out.println( "   Processor " + id + " is busy" );

                return false;

            }

            System.out.println( "Processor " + id + " - " + img.process() );

            return true;

        }

    }

 

    public static void main( String[] args ) {

        Image[] input = { new IR(), new IR(), new LS(), new IR(), new LS(), new LS() };

        Processor[] procs = { new Processor(), new Processor(), new Processor() };

        for (int i=0, j; i < input.length; i++) {

            j = 0;

            while ( ! procs[j].handle( input[i] ))

                j = (j+1) % procs.length;

        }

    }

}