comment out obsolete mutex classes, not part of latest java and no longer very useful technique

assignments/src/MV3500Cohort2019JulySeptember/projects/BrennenstuhlKnobelochMcCann/BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver.java

 package MV3500Cohort2019JulySeptember.projects.BrennenstuhlKnobelochMcCann;
 
-import com.sun.corba.se.impl.orbutil.concurrent.Mutex; // JDK 8
+//import com.sun.corba.se.impl.orbutil.concurrent.Mutex; // JDK 8 // obsolete, undesirable approach
 // TODO JDK 13?
 // maybe https://crunchify.com/what-is-java-semaphore-and-mutex-java-concurrency-multithread-explained-with-example/
 import java.net.*;
@@ -20,7 +20,7 @@ public class BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver extends Thread
     static final boolean USE_FAST_ESPDU = false;
     static List<Integer> savedMCASTMessages = new ArrayList();
     static List<Pdu> mcastMessagesToSend = new ArrayList();
-    static Mutex mutex = new Mutex();
+//    static Mutex mutex = new Mutex(); // obsolete, undesirable approach
     static boolean keepRunning = false;
     static boolean isRunning = false;
     
@@ -52,19 +52,19 @@ public class BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver extends Thread
                         System.out.println("BRE_KNO_MCC_PC1_MCAST received Massage.");
                         savedMCASTMessages.add(pdu.getTimestamp());
 
-                        try
-                        {
-                            mutex.acquire();
+//                        try // obsolete, undesirable approach
+//                        {
+//                            mutex.acquire(); // obsolete, undesirable approach
                             System.out.println("PC2 - PC1 received: Internal ID " + pdu.getTimestamp() + " added.");
                             mcastMessagesToSend.add(pdu);
-                            mutex.release();
+//                            mutex.release(); // obsolete, undesirable approach
 
                             System.out.println("Added to SendList and saved in archiv.");
-                        }
-                        catch (InterruptedException ex)
-                        {
-                            Logger.getLogger(BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver.class.getName()).log(Level.SEVERE, null, ex);
-                        }
+//                        }
+//                        catch (InterruptedException ex) // obsolete, undesirable approach
+//                        {
+//                            Logger.getLogger(BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver.class.getName()).log(Level.SEVERE, null, ex);
+//                        }
                     }
                     else
                     {
@@ -117,46 +117,46 @@ public class BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver extends Thread
 
     public void resetSavedMCASTMessagesList()
     {
-        try
-        {
-            mutex.acquire();
+//        try // obsolete, undesirable approach
+//        {
+//            mutex.acquire(); // obsolete, undesirable approach
             savedMCASTMessages.clear();
-            mutex.release();
-        }
-        catch (InterruptedException ex)
-        {
-            Logger.getLogger(BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver.class.getName()).log(Level.SEVERE, null, ex);
-        }
+//            mutex.release();
+//        }
+//        catch (InterruptedException ex)
+//        {
+//            Logger.getLogger(BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver.class.getName()).log(Level.SEVERE, null, ex);
+//        }
     }
 
     public void resetMcastMessagesToSend()
     {
-        try
-        {
-            mutex.acquire();
+//        try // obsolete, undesirable approach
+//        {
+//            mutex.acquire(); // obsolete, undesirable approach
             mcastMessagesToSend.clear();
-            mutex.release();
-        }
-        catch (InterruptedException ex)
-        {
-            Logger.getLogger(BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver.class.getName()).log(Level.SEVERE, null, ex);
-        }
+//            mutex.release(); // obsolete, undesirable approach
+//        }
+//        catch (InterruptedException ex)
+//        {
+//            Logger.getLogger(BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver.class.getName()).log(Level.SEVERE, null, ex);
+//        }
     }
 
     public List<Pdu> getMCASTMessagesToSend()
     {
         List<Pdu> temp = null;
-        try
-        {
-            mutex.acquire();
+//        try // obsolete, undesirable approach
+//        {
+//            mutex.acquire(); // obsolete, undesirable approach
             temp = new ArrayList(mcastMessagesToSend);
             mcastMessagesToSend.clear();                    
-            mutex.release();
-        }
-        catch (InterruptedException ex)
-        {
-            Logger.getLogger(BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver.class.getName()).log(Level.SEVERE, null, ex);
-        }
+//            mutex.release(); // obsolete, undesirable approach
+//        }
+//        catch (InterruptedException ex) // obsolete, undesirable approach
+//        {
+//            Logger.getLogger(BRE_KNO_MCC_PC2_PC1_MCAST_PduReceiver.class.getName()).log(Level.SEVERE, null, ex);
+//        }
         return temp;
     }
 }

assignments/src/MV3500Cohort2019JulySeptember/projects/BrennenstuhlKnobelochMcCann/BRE_KNO_MCC_PC2_PC3_UNICAST_PduSender.java

 package MV3500Cohort2019JulySeptember.projects.BrennenstuhlKnobelochMcCann;
 
-import com.sun.corba.se.impl.orbutil.concurrent.Mutex; // JDK 8
+//import com.sun.corba.se.impl.orbutil.concurrent.Mutex; // JDK 8 // obsolete, undesirable approach
 // TODO JDK 13?
 // maybe https://crunchify.com/what-is-java-semaphore-and-mutex-java-concurrency-multithread-explained-with-example/
 import java.util.*;
@@ -19,7 +19,7 @@ import java.util.logging.Logger;
 
 public class BRE_KNO_MCC_PC2_PC3_UNICAST_PduSender extends Thread
 {
-    static Mutex mutex = new Mutex();
+//    static Mutex mutex = new Mutex(); // obsolete, undesirable approach
     static List<Pdu> messagesToSend = new ArrayList();
     static boolean keepRunning = false;
     static boolean isRunning = false;
@@ -37,14 +37,14 @@ public class BRE_KNO_MCC_PC2_PC3_UNICAST_PduSender extends Thread
             
             while (keepRunning)
             {
-                try
-                {
-                    mutex.acquire();
+//                try // obsolete, undesirable approach
+//                {
+//                    mutex.acquire(); // obsolete, undesirable approach
                     if (!messagesToSend.isEmpty())
                     {
                         Pdu tempPdu = messagesToSend.get(0);
                         messagesToSend.remove(messagesToSend.get(0));
-                        mutex.release();
+//                        mutex.release(); // obsolete, undesirable approach
                         
                         if (tempPdu.getPduType() != DisPduType.COMMENT)
                         {
@@ -78,16 +78,16 @@ public class BRE_KNO_MCC_PC2_PC3_UNICAST_PduSender extends Thread
                             }
                         }
                     }
-                    else
-                    {
-                        mutex.release();
-                    }
-                }
-                catch (InterruptedException ex)
-                {
-                    Logger.getLogger(BRE_KNO_MCC_PC2_PC3_UNICAST_PduSender.class.getName()).log(Level.SEVERE, null, ex);
+//                    else
+//                    {
+//                        mutex.release(); // obsolete, undesirable approach
+//                    }
                 }
-            }
+//                catch (InterruptedException ex)
+//                {
+//                    Logger.getLogger(BRE_KNO_MCC_PC2_PC3_UNICAST_PduSender.class.getName()).log(Level.SEVERE, null, ex);
+//                }
+//            }
         }
         catch (SocketException ex)
         {
@@ -113,19 +113,19 @@ public class BRE_KNO_MCC_PC2_PC3_UNICAST_PduSender extends Thread
 
     public void setListToSend(List<Pdu> pduSetToSend)
     {
-        try
-        {
-            mutex.acquire();
+//        try // obsolete, undesirable approach
+//        {
+//            mutex.acquire(); // obsolete, undesirable approach
             while (!pduSetToSend.isEmpty())
             {
                 messagesToSend.add(pduSetToSend.get(0));
                 pduSetToSend.remove(0);
             }
-            mutex.release();
-        }
-        catch (InterruptedException ex)
-        {
-            Logger.getLogger(BRE_KNO_MCC_PC2_PC3_UNICAST_PduSender.class.getName()).log(Level.SEVERE, null, ex);
-        }
+//            mutex.release(); // obsolete, undesirable approach
+//        }
+//        catch (InterruptedException ex)
+//        {
+//            Logger.getLogger(BRE_KNO_MCC_PC2_PC3_UNICAST_PduSender.class.getName()).log(Level.SEVERE, null, ex);
+//        }
     }
 }