src/java/org/mxchange/jjobs/beans/country/JobsCountryWebRequestBean.java

   1 /*
   2  * Copyright (C) 2016 - 2018 Free Software Foundation
   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.jjobs.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.added.ObservableAdminAddedCountryEvent;
  32 import org.mxchange.jcountry.exceptions.CountryNotFoundException;
  33 import org.mxchange.jcountry.model.data.Country;
  34 import org.mxchange.jcountry.model.data.CountrySingletonBeanRemote;
  35 import org.mxchange.jjobs.beans.BaseJobsBean;
  36
  37 /**
  38  * A country bean
  39  * <p>
  40  * @author Roland Häder<roland@mxchange.org>
  41  */
  42 @Named ("countryController")
  43 @RequestScoped
  44 public class JobsCountryWebRequestBean extends BaseJobsBean implements JobsCountryWebRequestController {
  45
  46         /**
  47          * Serial number
  48          */
  49         private static final long serialVersionUID = 176_985_298_681_742_960L;
  50
  51         /**
  52          * Remote country EJB
  53          */
  54         @EJB (lookup = "java:global/jjobs-ejb/country!org.mxchange.jcountry.model.data.CountrySingletonBeanRemote")
  55         private CountrySingletonBeanRemote countryBean;
  56
  57         /**
  58          * List of all countries
  59          */
  60         @Inject
  61         @NamedCache (cacheName = "countryCache")
  62         private Cache<Long, Country> countryCache;
  63
  64         /**
  65          * Default constructor
  66          */
  67         public JobsCountryWebRequestBean () {
  68                 // Call super constructor
  69                 super();
  70         }
  71
  72         /**
  73          * Observing method when the event is fired that an administrator added a
  74          * new country
  75          * <p>
  76          * @param event Event instance
  77          */
  78         public void afterAdminAddedCountryEvent (@Observes final ObservableAdminAddedCountryEvent event) {
  79                 // Is all valid?
  80                 if (null == event) {
  81                         // Throw NPE
  82                         throw new NullPointerException("event is null"); //NOI18N
  83                 } else if (event.getAddedCountry() == null) {
  84                         // Throw again ...
  85                         throw new NullPointerException("event.addedCountry is null"); //NOI18N
  86                 } else if (event.getAddedCountry().getCountryId() == null) {
  87                         // And again ...
  88                         throw new NullPointerException("event.addedCountry.countryId is null"); //NOI18N
  89                 } else if (event.getAddedCountry().getCountryId() < 1) {
  90                         // Id is invalid
  91                         throw new IllegalArgumentException(MessageFormat.format("event.addedCountry.countryId={0} is not valid.", event.getAddedCountry().getCountryId())); //NOI18N
  92                 }
  93
  94                 // Add the event
  95                 this.countryCache.put(event.getAddedCountry().getCountryId(), event.getAddedCountry());
  96         }
  97
  98         @Override
  99         @SuppressWarnings ("ReturnOfCollectionOrArrayField")
 100         public List<Country> allCountries () {
 101                 // Init list
 102                 final List<Country> list = new LinkedList<>();
 103
 104                 // Get iterator
 105                 final Iterator<Cache.Entry<Long, Country>> iterator = this.countryCache.iterator();
 106
 107                 // Loop over all
 108                 while (iterator.hasNext()) {
 109                         // Get next entry
 110                         final Cache.Entry<Long, Country> next = iterator.next();
 111
 112                         // Add value to list
 113                         list.add(next.getValue());
 114                 }
 115
 116                 // Return it
 117                 return list;
 118         }
 119
 120         @Override
 121         public Country findCountryById (final Long countryId) throws CountryNotFoundException {
 122                 // Validate parameter
 123                 if (null == countryId) {
 124                         // Throw NPE
 125                         throw new NullPointerException("countryId is null"); //NOI18N
 126                 } else if (countryId < 1) {
 127                         // Throw IAE
 128                         throw new IllegalArgumentException("countryId=" + countryId + " is invalid"); //NOI18N
 129                 } else if (!this.countryCache.containsKey(countryId)) {
 130                         // Not found
 131                         throw new CountryNotFoundException(countryId);
 132                 }
 133
 134                 // Get it from cache
 135                 final Country country = this.countryCache.get(countryId);
 136
 137                 // Return it
 138                 return country;
 139         }
 140
 141         /**
 142          * Post-construction method
 143          */
 144         @PostConstruct
 145         public void init () {
 146                 // Is cache there?
 147                 if (!this.countryCache.iterator().hasNext()) {
 148                         // Get whole list
 149                         final List<Country> countries = this.countryBean.allCountries();
 150
 151                         // Add all
 152                         for (final Country country : countries) {
 153                                 // Add it to cache
 154                                 this.countryCache.put(country.getCountryId(), country);
 155                         }
 156                 }
 157         }
 158
 159 }