poem.boundary.Boundary Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of poem-hexagon Show documentation

A simple example for a hexagonal architecture.

The newest version!

package poem.boundary;

import java.util.function.Consumer;

import org.requirementsascode.BehaviorModel;
import org.requirementsascode.Model;
import org.requirementsascode.StatelessBehavior;

import poem.boundary.driven_port.IObtainPoems;
import poem.boundary.driven_port.IWriteLines;
import poem.boundary.driver_port.IReactToCommands;
import poem.boundary.internal.command_handler.DisplayRandomPoem;
import poem.command.AskForPoem;

/**
 * The boundary class is the only point of communication with left-side driver
 * adapters. It accepts commands, and calls the appropriate command handler.
 * 
 * On creation, this class wires up the dependencies between command types and
 * command handlers, by injecting the command handlers into a behavior model.
 * 
 * After creation, this class sends each command it receives to the behavior.
 * The behavior then dispatches the command to the appropriate command handler, 
 * which in turn calls the driven adapters.
 * 
 * @author b_muth
 *
 */
public class Boundary implements IReactToCommands, BehaviorModel {
  private final IObtainPoems poemObtainer;
  private final IWriteLines lineWriter;
  private StatelessBehavior behavior;

	private static final Class asksForPoem = AskForPoem.class;

	public Boundary(IObtainPoems poemObtainer, IWriteLines lineWriter) {
	  this.poemObtainer = poemObtainer;
	  this.lineWriter = lineWriter;
		this.behavior = StatelessBehavior.of(this);
	}

	@Override
	public Model model() {
		return Model.builder()
			.user(asksForPoem).system(displaysRandomPoem())
		.build();
	}

	@Override
	public void reactTo(Object commandObject) {
		behavior.reactTo(commandObject);
	}
	
	private Consumer displaysRandomPoem(){
    return new DisplayRandomPoem(poemObtainer, lineWriter);
	}
}