src/java/org/mxchange/jfinancials/beans/business/department/FinancialsDepartmentWebRequestBean.java

   1 /*
   2  * Copyright (C) 2017, 2020 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.jfinancials.beans.business.department;
  18
  19 import fish.payara.cdi.jsr107.impl.NamedCache;
  20 import java.text.MessageFormat;
  21 import java.util.Comparator;
  22 import java.util.Iterator;
  23 import java.util.LinkedList;
  24 import java.util.List;
  25 import javax.annotation.PostConstruct;
  26 import javax.cache.Cache;
  27 import javax.ejb.EJB;
  28 import javax.enterprise.context.RequestScoped;
  29 import javax.enterprise.event.Observes;
  30 import javax.inject.Inject;
  31 import javax.inject.Named;
  32 import org.mxchange.jcontactsbusiness.events.department.added.ObservableDepartmentAddedEvent;
  33 import org.mxchange.jcontactsbusiness.exceptions.department.DepartmentNotFoundException;
  34 import org.mxchange.jcontactsbusiness.model.department.Department;
  35 import org.mxchange.jcontactsbusiness.model.department.DepartmentSessionBeanRemote;
  36 import org.mxchange.jfinancials.beans.BaseFinancialsBean;
  37
  38 /**
  39  * A general bean for departments
  40  * <p>
  41  * @author Roland Häder<roland@mxchange.org>
  42  */
  43 @Named ("departmentController")
  44 @RequestScoped
  45 public class FinancialsDepartmentWebRequestBean extends BaseFinancialsBean implements FinancialsDepartmentWebRequestController {
  46
  47         /**
  48          * Serial number
  49          */
  50         private static final long serialVersionUID = 5_028_697_360_461L;
  51
  52         /**
  53          * A list of all departments
  54          */
  55         private final List<Department> allDepartments;
  56
  57         /**
  58          * EJB for administrative purposes
  59          */
  60         @EJB (lookup = "java:global/jfinancials-ejb/department!org.mxchange.jcontactsbusiness.model.department.DepartmentSessionBeanRemote")
  61         private DepartmentSessionBeanRemote departmentBean;
  62
  63         /**
  64          * A list of all departments (globally)
  65          */
  66         @Inject
  67         @NamedCache (cacheName = "departmentCache")
  68         private Cache<Long, Department> departmentCache;
  69
  70         /**
  71          * A list of filtered departments
  72          */
  73         private List<Department> filteredDepartments;
  74
  75         /**
  76          * Default constructor
  77          */
  78         public FinancialsDepartmentWebRequestBean () {
  79                 // Call super constructor
  80                 super();
  81
  82                 // Init list
  83                 this.allDepartments = new LinkedList<>();
  84         }
  85
  86         /**
  87          * Observes events being fired when a department has been added.
  88          * <p>
  89          * @param event Event being fired
  90          * <p>
  91          * @throws NullPointerException If the parameter or it's carried instance is
  92          * null
  93          * @throws IllegalArgumentException If the branchId is zero or lower
  94          */
  95         public void afterDepartmentAddedEvent (@Observes final ObservableDepartmentAddedEvent event) {
  96                 // Validate parameter
  97                 if (null == event) {
  98                         // Throw NPE
  99                         throw new NullPointerException("event is null"); //NOI18N
 100                 } else if (event.getDepartment() == null) {
 101                         // Throw NPE again
 102                         throw new NullPointerException("event.department is null"); //NOI18N
 103                 } else if (event.getDepartment().getDepartmentId() == null) {
 104                         // Throw it again
 105                         throw new NullPointerException("event.department.branchId is null"); //NOI18N
 106                 } else if (event.getDepartment().getDepartmentId() < 1) {
 107                         // Throw IAE
 108                         throw new IllegalArgumentException(MessageFormat.format("event.department.branchId={0} is not valid", event.getDepartment().getDepartmentId())); //NOI18N
 109                 }
 110
 111                 // Add instance to cache
 112                 this.departmentCache.put(event.getDepartment().getDepartmentId(), event.getDepartment());
 113                 this.allDepartments.add(event.getDepartment());
 114         }
 115
 116         @Override
 117         @SuppressWarnings ("ReturnOfCollectionOrArrayField")
 118         public List<Department> allDepartments () {
 119                 return this.allDepartments;
 120         }
 121
 122         @Override
 123         public Department findDepartmentById (final Long departmentId) throws DepartmentNotFoundException {
 124                 // Validate parameter
 125                 if (null == departmentId) {
 126                         // Throw NPE
 127                         throw new NullPointerException("departmentId is null"); //NOI18N
 128                 } else if (departmentId < 1) {
 129                         // Throw IAE
 130                         throw new IllegalArgumentException("departmentId=" + departmentId + " is invalid"); //NOI18N
 131                 } else if (!this.departmentCache.containsKey(departmentId)) {
 132                         // Not found
 133                         throw new DepartmentNotFoundException(departmentId);
 134                 }
 135
 136                 // Get it from cache
 137                 final Department department = this.departmentCache.get(departmentId);
 138
 139                 // Return it
 140                 return department;
 141         }
 142
 143         /**
 144          * Getter for a list of filtered departments
 145          * <p>
 146          * @return Filtered departments
 147          */
 148         @SuppressWarnings ("ReturnOfCollectionOrArrayField")
 149         public List<Department> getFilteredDepartments () {
 150                 return this.filteredDepartments;
 151         }
 152
 153         /**
 154          * Setter for a list of filtered departments
 155          * <p>
 156          * @param filteredDepartments Filtered departments
 157          */
 158         @SuppressWarnings ("AssignmentToCollectionOrArrayFieldFromParameter")
 159         public void setFilteredDepartments (final List<Department> filteredDepartments) {
 160                 this.filteredDepartments = filteredDepartments;
 161         }
 162
 163         /**
 164          * Initializer method
 165          */
 166         @PostConstruct
 167         public void initializeList () {
 168                 // Is cache there?
 169                 if (!this.departmentCache.iterator().hasNext()) {
 170                         // Get whole list from EJB
 171                         final List<Department> departments = this.departmentBean.allDepartments();
 172
 173                         // Add all
 174                         for (final Department department : departments) {
 175                                 // Add it to cache
 176                                 this.departmentCache.put(department.getDepartmentId(), department);
 177                         }
 178                 }
 179
 180                 // Is the list empty, but filled cache?
 181                 if (this.allDepartments.isEmpty() && this.departmentCache.iterator().hasNext()) {
 182                         // Get iterator
 183                         final Iterator<Cache.Entry<Long, Department>> iterator = this.departmentCache.iterator();
 184
 185                         // Build up list
 186                         while (iterator.hasNext()) {
 187                                 // GEt next element
 188                                 final Cache.Entry<Long, Department> next = iterator.next();
 189
 190                                 // Add to list
 191                                 this.allDepartments.add(next.getValue());
 192                         }
 193
 194                         // Sort list
 195                         this.allDepartments.sort(new Comparator<Department>() {
 196                                 @Override
 197                                 public int compare (final Department o1, final Department o2) {
 198                                         return o1.getDepartmentId() > o2.getDepartmentId() ? 1 : o1.getDepartmentId() < o2.getDepartmentId() ? -1 : 0;
 199                                 }
 200                         });
 201                 }
 202         }
 203
 204 }