App.java

package com.iluwatar.servicelayer.app;

import java.util.List;

import com.iluwatar.servicelayer.magic.MagicService;
import com.iluwatar.servicelayer.magic.MagicServiceImpl;
import com.iluwatar.servicelayer.spell.Spell;
import com.iluwatar.servicelayer.spell.SpellDao;
import com.iluwatar.servicelayer.spell.SpellDaoImpl;
import com.iluwatar.servicelayer.spellbook.Spellbook;
import com.iluwatar.servicelayer.spellbook.SpellbookDao;
import com.iluwatar.servicelayer.spellbook.SpellbookDaoImpl;
import com.iluwatar.servicelayer.wizard.Wizard;
import com.iluwatar.servicelayer.wizard.WizardDao;
import com.iluwatar.servicelayer.wizard.WizardDaoImpl;


/**
 * Service layer defines an application's boundary with a layer of services that establishes 
 * a set of available operations and coordinates the application's response in each operation.
 * <p>
 * Enterprise applications typically require different kinds of interfaces to the data 
 * they store and the logic they implement: data loaders, user interfaces, integration gateways, 
 * and others. Despite their different purposes, these interfaces often need common interactions 
 * with the application to access and manipulate its data and invoke its business logic. The 
 * interactions may be complex, involving transactions across multiple resources and the 
 * coordination of several responses to an action. Encoding the logic of the interactions 
 * separately in each interface causes a lot of duplication.
 * <p>
 * The example application demonstrates interactions between a client ({@link App}) and a service 
 * ({@link MagicService}). The service is implemented with 3-layer architecture (entity, dao, service).
 * For persistence the example uses in-memory H2 database which is populated on each application
 * startup.
 *
 */
public class App {
	
	/**
	 * Program entry point
	 * @param args command line args
	 */
    public static void main( String[] args ) {   
    	// populate the in-memory database
    	initData();
    	// query the data using the service
    	queryData();
    }
    
    public static void initData() {
    	// spells
    	Spell spell1 = new Spell("Ice dart");
    	Spell spell2 = new Spell("Invisibility");
    	Spell spell3 = new Spell("Stun bolt");
    	Spell spell4 = new Spell("Confusion");
    	Spell spell5 = new Spell("Darkness");
    	Spell spell6 = new Spell("Fireball");
    	Spell spell7 = new Spell("Enchant weapon");
    	Spell spell8 = new Spell("Rock armour");
    	Spell spell9 = new Spell("Light");
    	Spell spell10 = new Spell("Bee swarm");
    	Spell spell11 = new Spell("Haste");
    	Spell spell12 = new Spell("Levitation");
    	Spell spell13 = new Spell("Magic lock");
    	Spell spell14 = new Spell("Summon hell bat");
    	Spell spell15 = new Spell("Water walking");
    	Spell spell16 = new Spell("Magic storm");
    	Spell spell17 = new Spell("Entangle");
    	SpellDao spellDao = new SpellDaoImpl();
    	spellDao.persist(spell1);
    	spellDao.persist(spell2);
    	spellDao.persist(spell3);
    	spellDao.persist(spell4);
    	spellDao.persist(spell5);
    	spellDao.persist(spell6);
    	spellDao.persist(spell7);
    	spellDao.persist(spell8);
    	spellDao.persist(spell9);
    	spellDao.persist(spell10);
    	spellDao.persist(spell11);
    	spellDao.persist(spell12);
    	spellDao.persist(spell13);
    	spellDao.persist(spell14);
    	spellDao.persist(spell15);
    	spellDao.persist(spell16);
    	spellDao.persist(spell17);
    	
    	// spellbooks
    	SpellbookDao spellbookDao = new SpellbookDaoImpl();
    	Spellbook spellbook1 = new Spellbook("Book of Orgymon");
    	spellbookDao.persist(spellbook1);
    	spellbook1.addSpell(spell1);
    	spellbook1.addSpell(spell2);
    	spellbook1.addSpell(spell3);    	
    	spellbook1.addSpell(spell4);    
    	spellbookDao.merge(spellbook1);
    	Spellbook spellbook2 = new Spellbook("Book of Aras");
    	spellbookDao.persist(spellbook2);
    	spellbook2.addSpell(spell5);
    	spellbook2.addSpell(spell6);    	
    	spellbookDao.merge(spellbook2);
    	Spellbook spellbook3 = new Spellbook("Book of Kritior");
    	spellbookDao.persist(spellbook3);
    	spellbook3.addSpell(spell7);
    	spellbook3.addSpell(spell8);
    	spellbook3.addSpell(spell9);    	
    	spellbookDao.merge(spellbook3);
    	Spellbook spellbook4 = new Spellbook("Book of Tamaex");
    	spellbookDao.persist(spellbook4);
    	spellbook4.addSpell(spell10);
    	spellbook4.addSpell(spell11);
    	spellbook4.addSpell(spell12);    	
    	spellbookDao.merge(spellbook4);
    	Spellbook spellbook5 = new Spellbook("Book of Idores");
    	spellbookDao.persist(spellbook5);
    	spellbook5.addSpell(spell13);
    	spellbookDao.merge(spellbook5);
    	Spellbook spellbook6 = new Spellbook("Book of Opaen");
    	spellbookDao.persist(spellbook6);
    	spellbook6.addSpell(spell14);
    	spellbook6.addSpell(spell15);    	
    	spellbookDao.merge(spellbook6);
    	Spellbook spellbook7 = new Spellbook("Book of Kihione");
    	spellbookDao.persist(spellbook7);
    	spellbook7.addSpell(spell16);
    	spellbook7.addSpell(spell17);
    	spellbookDao.merge(spellbook7);
    	
    	// wizards
    	WizardDao wizardDao = new WizardDaoImpl();
    	Wizard wizard1 = new Wizard("Aderlard Boud");
    	wizardDao.persist(wizard1);
    	wizard1.addSpellbook(spellbookDao.findByName("Book of Orgymon"));
    	wizard1.addSpellbook(spellbookDao.findByName("Book of Aras"));
    	wizardDao.merge(wizard1);
    	Wizard wizard2 = new Wizard("Anaxis Bajraktari");
    	wizardDao.persist(wizard2);
    	wizard2.addSpellbook(spellbookDao.findByName("Book of Kritior"));
    	wizard2.addSpellbook(spellbookDao.findByName("Book of Tamaex"));
    	wizardDao.merge(wizard2);
    	Wizard wizard3 = new Wizard("Xuban Munoa");
    	wizardDao.persist(wizard3);
    	wizard3.addSpellbook(spellbookDao.findByName("Book of Idores"));
    	wizard3.addSpellbook(spellbookDao.findByName("Book of Opaen"));
    	wizardDao.merge(wizard3);
    	Wizard wizard4 = new Wizard("Blasius Dehooge");
    	wizardDao.persist(wizard4);
    	wizard4.addSpellbook(spellbookDao.findByName("Book of Kihione"));
    	wizardDao.merge(wizard4);
    }
    
    public static void queryData() {
    	MagicService service = new MagicServiceImpl(new WizardDaoImpl(), new SpellbookDaoImpl(), new SpellDaoImpl());
    	System.out.println("Enumerating all wizards");
    	for (Wizard w: service.findAllWizards()) {
    		System.out.println(w.getName());
    	}
    	System.out.println("Enumerating all spellbooks");
    	for (Spellbook s: service.findAllSpellbooks()) {
    		System.out.println(s.getName());
    	}
    	System.out.println("Enumerating all spells");
    	for (Spell s: service.findAllSpells()) {
    		System.out.println(s.getName());
    	}
    	System.out.println("Find wizards with spellbook 'Book of Idores'");
    	List<Wizard> wizardsWithSpellbook = service.findWizardsWithSpellbook("Book of Idores");
    	for (Wizard w: wizardsWithSpellbook) {
    		System.out.println(String.format("%s has 'Book of Idores'", w.getName()));
    	}
    	System.out.println("Find wizards with spell 'Fireball'");
    	List<Wizard> wizardsWithSpell = service.findWizardsWithSpell("Fireball");
    	for (Wizard w: wizardsWithSpell) {
    		System.out.println(String.format("%s has 'Fireball'", w.getName()));
    	}
    }
}