src/java/org/mxchange/pizzaapplication/beans/country/PizzaCountryWebRequestBean.java

   1 /*
   2  * Copyright (C) 2016, 2017 Roland Häder
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU Affero General Public License as
   6  * published by the Free Software Foundation, either version 3 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU Affero General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Affero General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.mxchange.pizzaapplication.beans.country;
  18
  19 import fish.payara.cdi.jsr107.impl.NamedCache;
  20 import java.text.MessageFormat;
  21 import java.util.Iterator;
  22 import java.util.LinkedList;
  23 import java.util.List;
  24 import javax.annotation.PostConstruct;
  25 import javax.cache.Cache;
  26 import javax.ejb.EJB;
  27 import javax.enterprise.context.RequestScoped;
  28 import javax.enterprise.event.Observes;
  29 import javax.inject.Inject;
  30 import javax.inject.Named;
  31 import org.mxchange.jcountry.events.ObservableAdminAddedCountryEvent;
  32 import org.mxchange.jcountry.model.data.Country;
  33 import org.mxchange.jcountry.model.data.CountrySingletonBeanRemote;
  34 import org.mxchange.pizzaapplication.beans.BasePizzaController;
  35
  36 /**
  37  * A country bean
  38  * <p>
  39  * @author Roland Häder<roland@mxchange.org>
  40  */
  41 @Named ("countryController")
  42 @RequestScoped
  43 public class PizzaCountryWebRequestBean extends BasePizzaController implements PizzaCountryWebRequestController {
  44
  45         /**
  46          * Serial number
  47          */
  48         private static final long serialVersionUID = 176_985_298_681_742_960L;
  49
  50         /**
  51          * Remote country EJB
  52          */
  53         @EJB (lookup = "java:global/jfinancials-ejb/country!org.mxchange.jcountry.data.CountrySingletonBeanRemote")
  54         private CountrySingletonBeanRemote countryBean;
  55
  56         /**
  57          * List of all countries
  58          */
  59         @Inject
  60         @NamedCache (cacheName = "countryCache", managementEnabled = true)
  61         private transient Cache<Long, Country> countryCache;
  62
  63         /**
  64          * Default constructor
  65          */
  66         public PizzaCountryWebRequestBean () {
  67                 // Call super constructor
  68                 super();
  69         }
  70
  71         /**
  72          * Observing method when the event is fired that an administrator added a
  73          * new country
  74          * <p>
  75          * @param event Event instance
  76          */
  77         public void afterAdminAddedCountryEvent (@Observes final ObservableAdminAddedCountryEvent event) {
  78                 // Is all valid?
  79                 if (null == event) {
  80                         // Throw NPE
  81                         throw new NullPointerException("event is null"); //NOI18N
  82                 } else if (event.getAddedCountry() == null) {
  83                         // Throw again ...
  84                         throw new NullPointerException("event.addedCountry is null"); //NOI18N
  85                 } else if (event.getAddedCountry().getCountryId() == null) {
  86                         // And again ...
  87                         throw new NullPointerException("event.addedCountry.countryId is null"); //NOI18N
  88                 } else if (event.getAddedCountry().getCountryId() < 1) {
  89                         // Id is invalid
  90                         throw new IllegalArgumentException(MessageFormat.format("event.addedCountry.countryId={0} is not valid.", event.getAddedCountry().getCountryId())); //NOI18N
  91                 }
  92
  93                 // Add the event
  94                 this.countryCache.put(event.getAddedCountry().getCountryId(), event.getAddedCountry());
  95         }
  96
  97         @Override
  98         @SuppressWarnings ("ReturnOfCollectionOrArrayField")
  99         public List<Country> allCountries () {
 100                 // Init list
 101                 List<Country> list = new LinkedList<>();
 102
 103                 // Get iterator
 104                 Iterator<Cache.Entry<Long, Country>> iterator = this.countryCache.iterator();
 105
 106                 // Loop over all
 107                 while (iterator.hasNext()) {
 108                         // Get next entry
 109                         final Cache.Entry<Long, Country> next = iterator.next();
 110
 111                         // Add value to list
 112                         list.add(next.getValue());
 113                 }
 114
 115                 // Return it
 116                 return list;
 117         }
 118
 119         /**
 120          * Post-construction method
 121          */
 122         @PostConstruct
 123         public void init () {
 124                 // Is cache there?
 125                 if (!this.countryCache.iterator().hasNext()) {
 126                         // Get whole list
 127                         List<Country> list = this.countryBean.allCountries();
 128
 129                         // Add all
 130                         for (final Iterator<Country> iterator = list.iterator(); iterator.hasNext();) {
 131                                 // Get next element
 132                                 final Country next = iterator.next();
 133
 134                                 // Add it to cache
 135                                 this.countryCache.put(next.getCountryId(), next);
 136                         }
 137                 }
 138         }
 139
 140 }