From d88322ee7b2785a8f4e8e689fd3c71da411e1c7e Mon Sep 17 00:00:00 2001
From: brutzman <brutzman@nps.edu>
Date: Wed, 11 Aug 2021 12:03:19 -0700
Subject: [PATCH] explicitly catch InterruptedException, rename variable for
clarity
---
.../Assignment1TCPExample3ClientChange.java | 198 +++++++++---------
1 file changed, 99 insertions(+), 99 deletions(-)
diff --git a/examples/src/TcpExamples/Assignment1TCPExample3ClientChange.java b/examples/src/TcpExamples/Assignment1TCPExample3ClientChange.java
index 10b89e0ed0..862a2d1b9f 100644
--- a/examples/src/TcpExamples/Assignment1TCPExample3ClientChange.java
+++ b/examples/src/TcpExamples/Assignment1TCPExample3ClientChange.java
@@ -1,99 +1,99 @@
-package TcpExamples;
-
-import java.io.*;
-import java.net.*;
-
-/**
- * This is Assignment 1 where I have modified the given code from TCPExample3Client
- * -sleep time has been extended to give more time in between loops
- * -Initial print line has been altered to reflect assingnment 1
- * -Loop only runs a finite number of times ,10.
- * Before, we always used telnet (netcat) to connect to the server. Here we are
- * now writing our own program to do the connection.
- *
- * As you will see, when we run this after we start the server we will see the
- * same string telnet printed, sent by the server. The output at the server will
- * show different socket pairs for each time the loop iterates.
- *
- * @author mcgredo
- * @author brutzman
- */
-public class Assignment1TCPExample3ClientChange {
-
- /** IPv6 String constant for localhost address, similarly IPv4 127.0.0.1
- * @see <a href="https://en.wikipedia.org/wiki/localhost">https://en.wikipedia.org/wiki/localhost</a>
- * @see <a href="https://en.wikipedia.org/wiki/IPv6_address">https://en.wikipedia.org/wiki/IPv6_address</a>
- */
- public final static String LOCALHOST = "0:0:0:0:0:0:0:1";
-
- /**
- * Program invocation, execution starts here
- * @param args command-line arguments
- */
- public static void main(String[] args) throws InterruptedException {
-
- // Local variables/fields
- Socket socket = null;
- InputStream is;
- Reader isr;
- BufferedReader br;
- String serverMessage;
- int clientLoopCount = 0;
- int numbLoops = 10;
-
- try {
- while (clientLoopCount < numbLoops)
- {
- clientLoopCount++; // increment at beginning of loop for reliability
- System.out.println(Assignment1TCPExample3ClientChange.class.getName() + " creating socket...");
-
- // We request an IP to connect to ("localhost") and
- // port number at that IP (2317). This establishes
- // a connection to that IP in the form of a Socket
- // object; the server uses a ServerSocket to wait for
- // connections.
- socket = new Socket(LOCALHOST, 2317); // locohost?
-
- // Now hook everything up (i.e. set up the streams), Java style:
- is = socket.getInputStream();
- isr = new InputStreamReader(is);
- br = new BufferedReader(isr);
-
- // Read a single line written by the server. We'd
- // do things a bit differently if there were many lines to be read
- // from the server instead of one only.
- serverMessage = br.readLine();
- System.out.println("======================Assignment1===========================");
-
- 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)
-
- Thread.sleep(800l); // slow things down, for example 500l (long) = 500 msec
-
- } // end while(true) // infinite loops are dangerous, be sure to kill this process!
- }
- catch (IOException e)
- {
- System.err.println("Problem with " + TcpExample3Client.class.getName() + " networking:"); // describe what is happening
- System.err.println("Error: " + e);
-
- // Provide more helpful information to user if exception occurs due to running twice at one time
- if (e instanceof java.net.BindException) {
- System.err.println("*** Be sure to stop any other running instances of programs using this port!");
- }
- }
- finally // occurs after any other activity when shutting down
- {
- try {
- if (socket != null)
- socket.close();
- } catch (IOException e) {}
-
- // program exit: tell somebody about that happening. Likely cause: server drops connection.
- System.out.println();
- System.out.println(TcpExample3Client.class.getName() + " exit");
- }
- }
-}
+package TcpExamples;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * This is Assignment 1 where I have modified the given code from TCPExample3Client
+ * -sleep time has been extended to give more time in between loops
+ * -Initial print line has been altered to reflect assingnment 1
+ * -Loop only runs a finite number of times ,10.
+ * Before, we always used telnet (netcat) to connect to the server. Here we are
+ * now writing our own program to do the connection.
+ *
+ * As you will see, when we run this after we start the server we will see the
+ * same string telnet printed, sent by the server. The output at the server will
+ * show different socket pairs for each time the loop iterates.
+ *
+ * @author mcgredo
+ * @author brutzman
+ */
+public class Assignment1TCPExample3ClientChange {
+
+ /** IPv6 String constant for localhost address, similarly IPv4 127.0.0.1
+ * @see <a href="https://en.wikipedia.org/wiki/localhost">https://en.wikipedia.org/wiki/localhost</a>
+ * @see <a href="https://en.wikipedia.org/wiki/IPv6_address">https://en.wikipedia.org/wiki/IPv6_address</a>
+ */
+ public final static String LOCALHOST = "0:0:0:0:0:0:0:1";
+
+ /**
+ * Program invocation, execution starts here
+ * @param args command-line arguments
+ */
+ public static void main(String[] args)
+ {
+ // Local variables/fields
+ Socket socket = null;
+ InputStream is;
+ Reader isr;
+ BufferedReader br;
+ String serverMessage;
+ int clientLoopCount = 0;
+ int numberOfLoops = 10;
+
+ try {
+ while (clientLoopCount < numberOfLoops)
+ {
+ clientLoopCount++; // increment at beginning of loop for reliability
+ System.out.println(Assignment1TCPExample3ClientChange.class.getName() + " creating socket...");
+
+ // We request an IP to connect to ("localhost") and
+ // port number at that IP (2317). This establishes
+ // a connection to that IP in the form of a Socket
+ // object; the server uses a ServerSocket to wait for
+ // connections.
+ socket = new Socket(LOCALHOST, 2317); // locohost?
+
+ // Now hook everything up (i.e. set up the streams), Java style:
+ is = socket.getInputStream();
+ isr = new InputStreamReader(is);
+ br = new BufferedReader(isr);
+
+ // Read a single line written by the server. We'd
+ // do things a bit differently if there were many lines to be read
+ // from the server instead of one only.
+ serverMessage = br.readLine();
+ System.out.println("======================Assignment1===========================");
+
+ 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)
+
+ Thread.sleep(800l); // slow things down, for example 500l (long) = 500 msec
+
+ } // end while(true) // infinite loops are dangerous, be sure to kill this process!
+ }
+ catch (IOException | InterruptedException e)
+ {
+ System.err.println("Problem with " + TcpExample3Client.class.getName() + " networking:"); // describe what is happening
+ System.err.println("Error: " + e);
+
+ // Provide more helpful information to user if exception occurs due to running twice at one time
+ if (e instanceof java.net.BindException) {
+ System.err.println("*** Be sure to stop any other running instances of programs using this port!");
+ }
+ }
+ finally // occurs after any other activity when shutting down
+ {
+ try {
+ if (socket != null)
+ socket.close();
+ } catch (IOException e) {}
+
+ // program exit: tell somebody about that happening. Likely cause: server drops connection.
+ System.out.println();
+ System.out.println(TcpExample3Client.class.getName() + " exit");
+ }
+ }
+}
--
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