dispatcher_view.rb

module Pulso
  module Esper
    module View
      class JRubyDispatcherViewFactory
        def initialize
          puts "Hello, World!"
        end
      end

      class JRubyDispatcherView
        def initialize
          puts "Hello, World!"
        end
      end
    end
  end
end

Esper_JRubyDispatcherViewFactory.java

package pt.ptp.pulso.esper.view;

import com.espertech.esper.client.EventType;
import com.espertech.esper.core.StatementContext;
import com.espertech.esper.epl.expression.ExprNode;
import com.espertech.esper.view.View;
import com.espertech.esper.view.ViewFactory;
import com.espertech.esper.view.ViewFactoryContext;
import com.espertech.esper.view.ViewFactorySupport;
import com.espertech.esper.view.ViewParameterException;
import java.util.List;

import org.jruby.embed.ScriptingContainer;
import org.jruby.embed.PathType;

public class JRubyDispatcherViewFactory extends ViewFactorySupport {

    private final static String JRUBY_SCRIPT = "src/main/ruby/dispatcher_view.rb";

    private ScriptingContainer jruby;

    private EventType eventType;

    public JRubyDispatcherViewFactory() {
        super();
        this.jruby = new ScriptingContainer();
        Object jrubyDelegateFactoryClass = jruby.runScriptlet(PathType.CLASSPATH, JRUBY_SCRIPT);
        Object jrubyDelegateFactory = jruby.callMethod(jrubyDelegateFactoryClass, "new", Object.class);
    }

    public void setViewParameters(ViewFactoryContext context,
            List<ExprNode> expressionParams) throws ViewParameterException {

        List<Object> viewParameters = ViewFactorySupport.validateAndEvaluate("'Custom Size' view",
                context.getStatementContext(), expressionParams);

        if (!viewParameters.isEmpty()) {
            throw new ViewParameterException("'Custom Size' view does not take any parameters");
        }


    }

    public void attach(EventType parentEvtType, StatementContext context,
            ViewFactory viewFactory, List<ViewFactory> parentViewFactories) throws ViewParameterException {
        this.eventType = JRubyDispatcherView.createEventType(context);
    }

    public View makeView(StatementContext context) {
        return new JRubyDispatcherView(context);
    }

    public EventType getEventType() { return this.eventType; }

}