src/org/mxchange/jcoreee/database/BaseDatabaseBean.java

   1 /*
   2  * Copyright (C) 2016 Roland Haeder
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (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 General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.mxchange.jcoreee.database;
  18
  19 import java.io.Serializable;
  20 import java.text.MessageFormat;
  21 import javax.jms.JMSException;
  22 import javax.jms.MessageProducer;
  23 import javax.jms.ObjectMessage;
  24 import javax.naming.Context;
  25 import javax.naming.InitialContext;
  26 import javax.naming.NamingException;
  27 import javax.persistence.EntityManager;
  28 import javax.persistence.PersistenceContext;
  29 import org.mxchange.jcoreeelogger.beans.local.logger.Log;
  30 import org.mxchange.jcoreeelogger.beans.local.logger.LoggerBeanLocal;
  31
  32 /**
  33  * A helper class for beans that access the database.
  34  * <p>
  35  * @author Roland Haeder<roland@mxchange.org>
  36  */
  37 public abstract class BaseDatabaseBean implements Serializable {
  38
  39         /**
  40          * Serial number
  41          */
  42         private static final long serialVersionUID = 217_687_175_985_875L;
  43
  44         /**
  45          * Entity manager
  46          */
  47         @PersistenceContext
  48         private EntityManager entityManager;
  49
  50         /**
  51          * Logger instance
  52          */
  53         @Log
  54         private LoggerBeanLocal loggerBeanLocal;
  55
  56         /**
  57          * Protected constructor
  58          */
  59         protected BaseDatabaseBean () {
  60                 try {
  61                         // Get initial context
  62                         Context context = new InitialContext();
  63
  64                         // Lookup logger
  65                         this.loggerBeanLocal = (LoggerBeanLocal) context.lookup("java:global/jcore-logger-ejb/logger!org.mxchange.jcoreeelogger.beans.local.logger.LoggerBeanLocal"); //NOI18N
  66                 } catch (final NamingException ex) {
  67                         // Continue to throw
  68                         throw new RuntimeException(MessageFormat.format("context.lookup() failed: {0}", ex.getMessage()), ex); //NOI18N
  69                 }
  70         }
  71
  72         /**
  73          * Getter for connection instance
  74          * <p>
  75          * @return Connection instance
  76          */
  77         protected EntityManager getEntityManager () {
  78                 return this.entityManager;
  79         }
  80
  81         /**
  82          * Getter for loggerBeanLocal
  83          * <p>
  84          * @return Logger instance
  85          */
  86         protected LoggerBeanLocal getLoggerBeanLocal () {
  87                 return this.loggerBeanLocal;
  88         }
  89
  90         /**
  91          * Sends given message to configured queue
  92          * <p>
  93          * @param message Message to send
  94          * @param messageProducer Message producer
  95          * <p>
  96          * @throws JMSException if something went wrong
  97          */
  98         protected void sendMessage (final ObjectMessage message, final MessageProducer messageProducer) throws JMSException {
  99                 // Trace message
 100                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.sendMessage: message={1},messageProducer={2} - CALLED!", this.getClass().getSimpleName(), message, messageProducer)); //NOI18N
 101
 102                 // The parameter should be valid
 103                 if (null == message) {
 104                         // Throw NPE
 105                         throw new NullPointerException("message is null"); //NOI18N
 106                 } else if (null == messageProducer) {
 107                         // Throw NPE again
 108                         throw new NullPointerException("messageProvider is null"); //NOI18N
 109                 }
 110
 111                 // Send it
 112                 messageProducer.send(message);
 113
 114                 // Trace message
 115                 this.getLoggerBeanLocal().logTrace(MessageFormat.format("{0}.sendMessage: EXIT!", this.getClass().getSimpleName())); //NOI18N
 116         }
 117
 118 }