put loop counters on both client and server for comparison

examples/src/TcpExamples/TcpExample3Client.java

@@ -27,9 +27,12 @@ public class TcpExample3Client {
         InputStreamReader isr;
         BufferedReader br;
         String serverMessage;
+        int clientLoopCount = 0;
         
         try {
-            while (true) {
+            while (true)
+            {
+                clientLoopCount++; // increment at beginning of loop for reliability
                 System.out.println("TcpExample3Client creating socket...");
 
                 // We request an IP to connect to ("localhost") and
@@ -49,12 +52,16 @@ public class TcpExample3Client {
                 // from the server instead of one only.
                 serverMessage = br.readLine();
                 System.out.println("==================================================");
-                System.out.println("Now we're talking!");
+                       
+                System.out.print  ("Client loop " + clientLoopCount + ": ");
+                System.out.println("now we're talking!");
                 System.out.println("The message the server sent was: '" + serverMessage + "'");
                 // socket gets closed, either automatically/silently by this code (or possibly by the server)
                 
             } // end while(true)
-        } catch (IOException e) {
+        } 
+        catch (IOException e)
+        {
             System.err.println("Problem with TcpExample3ServerClient networking:"); // describe what is happening
             System.err.println("Error: " + e);
             
@@ -62,10 +69,12 @@ public class TcpExample3Client {
             if (e instanceof java.net.BindException) {
                 System.err.println("*** Be sure to stop any other running instances of programs using this port!");
             }
-        } finally {
-        
-            // program exit: tell somebody about that
-            System.out.println("\nclient exit");
+        }
+        finally // occurs after any other activity when shutting down
+        {
+            // program exit: tell somebody about that happening.  Likely cause: server drops connection.
+            System.out.println();
+            System.out.println("TcpExample3Client exit");
         }
     }
 }

examples/src/TcpExamples/TcpExample3Server.java

@@ -37,6 +37,7 @@ public class TcpExample3Server {
             PrintStream ps;
             InetAddress localAddress, remoteAddress;
             int localPort, remotePort;
+            int serverLoopCount = 0;
 
             // Server is up and waiting (i.e. "blocked" or paused)
             // Loop, infinitely, waiting for client connections.
@@ -44,12 +45,14 @@ public class TcpExample3Server {
             while (true) { 
                 
                 // block until connected to a client
-                try (Socket clientConnectionSocket = serverSocket.accept()) {
+                try (Socket clientConnectionSocket = serverSocket.accept())
+                {
+                    serverLoopCount++; // increment at beginning of loop for reliability
                     
                     // Now hook everything up (i.e. set up the streams), Java style:
                     os = clientConnectionSocket.getOutputStream();
                     ps = new PrintStream(os);
-                    ps.println("This message was produced by the server."); // this gets sent back to client!
+                    ps.println("This is response " + serverLoopCount + " produced by the server."); // this gets sent back to client!
                     
                     // Print some information locally about the Socket connection.
                     // This includes the port and IP numbers on both sides (the socket pair).
@@ -57,6 +60,8 @@ public class TcpExample3Server {
                     remoteAddress = clientConnectionSocket.getInetAddress();
                         localPort = clientConnectionSocket.getLocalPort();
                        remotePort = clientConnectionSocket.getPort();
+                       
+                    System.out.print ("Server loop " + serverLoopCount + ": ");
                     
                     // My socket pair connection looks like this, to localhost:
                     // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 ))

examples/src/TcpExamples/TcpExample3TerminalLog.txt

@@ -5,32 +5,40 @@ Invocation instructions:
 Program responses:
 
 ===================================================
-run:
+run-single:
 TcpExample3Server has started...
-TcpExample3Server socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 49239 ))
-TcpExample3Server socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 49240 ))
-TcpExample3Server socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 49241 ))
+Server loop 1: TcpExample3Server socket pair showing host name, address, port:
+  (( 0:0:0:0:0:0:0:1=0:0:0:0:0:0:0:1, 2317 ), ( 0:0:0:0:0:0:0:1=0:0:0:0:0:0:0:1, 54180 ))
+  note HostName matches address if host has no DNS name
+Server loop 2: TcpExample3Server socket pair showing host name, address, port:
+  (( 0:0:0:0:0:0:0:1=0:0:0:0:0:0:0:1, 2317 ), ( 0:0:0:0:0:0:0:1=0:0:0:0:0:0:0:1, 54181 ))
+  note HostName matches address if host has no DNS name
+Server loop 3: TcpExample3Server socket pair showing host name, address, port:
+  (( 0:0:0:0:0:0:0:1=0:0:0:0:0:0:0:1, 2317 ), ( 0:0:0:0:0:0:0:1=0:0:0:0:0:0:0:1, 54182 ))
+  note HostName matches address if host has no DNS name
 [etc.]
 [kill process to exit]
 
 ===================================================
-run:
+run-single:
 TcpExample3Client creating socket...
 ==================================================
-Now we're talking!
-The message the server sent was This was written by the server
+Client loop 1: now we're talking!
+The message the server sent was: 'This is response 1 produced by the server.'
 TcpExample3Client creating socket...
 ==================================================
-Now we're talking!
-The message the server sent was This was written by the server
+Client loop 2: now we're talking!
+The message the server sent was: 'This is response 2 produced by the server.'
 TcpExample3Client creating socket...
 ==================================================
-Now we're talking!
-The message the server sent was This was written by the server
+Client loop 3: now we're talking!
+The message the server sent was: 'This is response 3 produced by the server.'
 TcpExample3Client creating socket...
 ==================================================
 [etc.]
+TcpExample3Client exit
 
 You must kill this process to get it to stop, each is in an infinite loop.
 
-If you kill the server, that will kill the client automatically when the connection drops.
+If you kill the server, that will kill the client automatically when the
+connection drops, because the client software program was written that way.