diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java b/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java
index d925c7fdc0b4cb83e4cd3eec4a662be1c4b49a09..91f18ffa79d3cd8ba9126bd8e399d3b57b10d304 100644
--- a/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework1/FisherTCPExample1Telnet.java
@@ -46,7 +46,7 @@ public class FisherTCPExample1Telnet {
// across what is in fact a slow connection
ps.flush();
}
- System.out.println("TcpExample1 completed successfully.");
+ System.out.println("FisherTCPExample1 completed successfully.");
}
catch(IOException e)
{
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Client.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Client.java
new file mode 100644
index 0000000000000000000000000000000000000000..ef9b10791b649039f00c9d6260a0919c9fa49d9a
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Client.java
@@ -0,0 +1,93 @@
+package MV3500Cohort2021JulySeptember.homework2;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * 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 snapp
+ */
+public class AllenTcpExample3Client {
+
+ /** 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;
+
+ try {
+ while (true)
+ {
+ clientLoopCount++; // increment at beginning of loop for reliability
+ System.out.println(AllenTcpExample3Client.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("==================================================");
+ System.out.println("Sorry, my dog ate my homework.");
+ System.out.println("The AllenServer responds with: " + serverMessage + "'");
+ System.out.println("Yeah, it took him a few bytes! This this my " + clientLoopCount +" time trying to contact you.");
+
+ // socket gets closed, either automatically/silently by this code (or possibly by the server)
+
+ Thread.sleep(500l); // 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 " + AllenTcpExample3Client.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(AllenTcpExample3Client.class.getName() + " exit");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Server.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Server.java
new file mode 100644
index 0000000000000000000000000000000000000000..912102f5ec3dacfe25834c8acecace1dc93e8ea9
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/AllenTcpExample3Server.java
@@ -0,0 +1,102 @@
+package MV3500Cohort2021JulySeptember.homework2;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * Very slightly more complex than example1, further modifying example2. The
+ * only thing this does differently is introduce a loop into the response, so
+ * you don't have to restart the program after one response. Also, it prints out
+ * the socket pair the server sees. Run the program via telnet several times and
+ * compare the socket pairs.
+ *
+ * telnet (nc) localhost 2317
+ *
+ * If you're sophisticated you can contact the instructor's computer while
+ * running this program.
+ *
+ * telnet (nc) [ipNumberOfServerLaptop] 2317
+ *
+ * and have the instructor display the socket pairs received.
+ *
+ * @snapp
+ */
+public class AllenTcpExample3Server {
+
+ /**
+ * Program invocation, execution starts here
+ * If already compiled, can run using console in directory ../../build/classes/ by invoking \
+ * java -classpath . TcpExamples.TcpExample3Server
+ * @param args command-line arguments
+ */
+ public static void main(String[] args) {
+ try {
+
+ // ServerSocket waits for a connection from a client.
+ // Notice that it is outside the loop; ServerSocket
+ // needs to be made only once.
+ System.out.println(AllenTcpExample3Server.class.getName() + " has started..."); // it helps debugging to put this on console first
+
+ ServerSocket serverSocket = new ServerSocket(2317);
+ OutputStream os;
+ 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.
+ // Stop the program somewhere else.
+ while (true) {
+
+ // block until connected to a client
+ 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 is response " + serverLoopCount + " produced by the server. Your dog ate your coding assignment?"); // 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).
+ localAddress = clientConnectionSocket.getLocalAddress();
+ 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 ))
+ // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+
+ // Why is the first IP/port the same, while the second set has different ports?
+ System.out.println(AllenTcpExample3Server.class.getName() + " socket pair showing host name, address, port:");
+ System.out.println(" (( " +
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " +
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+ if ( localAddress.getHostName().equals( localAddress.getHostAddress()) ||
+ remoteAddress.getHostName().equals(remoteAddress.getHostAddress()))
+ System.out.println(" note HostName matches address if host has no DNS name");
+
+ // Notice the use of flush() and try w/ resources. Without
+ // the try w/ resources the Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. try w/ resources explicitly ends the connection.
+ ps.flush();
+ // like it or not, you're outta here!
+ }
+ }
+ } catch (IOException e) {
+ System.err.println("Problem with " + AllenTcpExample3Server.class.getName() + " networking: " + 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!");
+ }
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherClient.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherClient.java
new file mode 100644
index 0000000000000000000000000000000000000000..00de0484e3b43b1a65a98be8f45d2ab5f96f8339
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherClient.java
@@ -0,0 +1,93 @@
+package MV3500Cohort2021JulySeptember.homework2.Fisher;
+
+//import static MV3500Cohort2020JulySeptember.homework2.White.WhiteClient.LOCALHOST;
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.Socket;
+
+/**
+ * Before, we always used telnet (netcat) to connect to 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 adfis
+ */
+public class FisherClient {
+
+ // IPv6 String constant for localhost address, similarly IPv4 127.0.0.1
+ public final static String LOCALHOST = "0:0:0:0:0:0:0:1";
+ // Sub with someone's IP
+ // Got it to work with McNeely in class
+ /**
+ * Program invocation, execution starts here
+ * @param args command-line arguments
+ */
+ public static void main(String[] args) {
+
+ // Local variables/fields
+ Socket socket;
+ InputStream is;
+ InputStreamReader isr;
+ BufferedReader br;
+ OutputStream os;
+ PrintStream ps;
+ String serverMessage;
+ int clientLoopCount = 1;
+
+ try {
+ System.out.println("FisherClient creating socket...");
+ // Made a loop counter for client to stop after 10 pings with server
+ while (clientLoopCount <= 10) {
+
+ // 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);
+
+ os = socket.getOutputStream();
+ ps = new PrintStream(os);
+
+ // 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("==================================================");
+
+ System.out.println("The message the server sent was: '" + serverMessage + "'");
+ System.out.println("FisherClient responds with: To get to the other side");
+ System.out.println("Loop count: " + clientLoopCount);
+ clientLoopCount++;
+ // socket gets closed, either automatically/silently by this code (or possibly by the server)
+
+ } // end while(true)
+ } catch (IOException e) {
+ System.err.println("Problem with FisherClient 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
+ {
+ // program exit: tell somebody about that happening. Likely cause: server drops connection.
+ System.out.println();
+ System.out.println("FisherClient exit");
+ }
+ }
+
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java
new file mode 100644
index 0000000000000000000000000000000000000000..c6b16ee66f6232df0f0735a47b0f92d762a3a038
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/FisherServer.java
@@ -0,0 +1,116 @@
+package MV3500Cohort2021JulySeptember.homework2.Fisher;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+/**
+ * Very slightly more complex than example1, further modifying example2. The
+ * only thing this does differently is introduce a loop into the response, so
+ * you don't have to restart the program after one response. Also, it prints out
+ * the socket pair the server sees. Run the program via telnet several times and
+ * compare the socket pairs.
+ *
+ * telnet (nc) localhost 2317
+ *
+ * If you're sophisticated you can contact the instructor's computer while
+ * running this program.
+ *
+ * telnet (nc) [ipNumberOfServerLaptop] 2317
+ *
+ * and have the instructor display the socket pairs received.
+ *
+ * @author adfis
+ */
+public class FisherServer {
+
+ /**
+ * @param args command-line arguments
+ */
+ public static void main(String[] args) {
+ try {
+
+ // ServerSocket waits for a connection from a client.
+ // Notice that it is outside the loop; ServerSocket
+ // needs to be made only once.
+ System.out.println("FisherServer has started..."); // it helps debugging to put this on console first
+
+ ServerSocket serverSocket = new ServerSocket(2317);
+ OutputStream os;
+ PrintStream ps;
+ InetAddress localAddress, remoteAddress;
+ int localPort, remotePort;
+
+ InputStream is;
+ InputStreamReader isr;
+ BufferedReader br;
+ int serverLoopCount = 1;
+
+
+ // Server is up and waiting (i.e. "blocked" or paused)
+ // Loop, infinitely, waiting for client connections.
+ // Stop the program somewhere else.
+ // Made a loop counter for server to stop after 10 pings with client
+ while (serverLoopCount <= 10) {
+
+ // block until connected to the client
+ try ( Socket clientConnectionSocket = serverSocket.accept()) {
+
+ // Now hook everything up (i.e. set up the streams), Java style:
+ os = clientConnectionSocket.getOutputStream();
+ ps = new PrintStream(os);
+ ps.println("Why did the chicken cross the road?"); // 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).
+ localAddress = clientConnectionSocket.getLocalAddress();
+ remoteAddress = clientConnectionSocket.getInetAddress();
+ localPort = clientConnectionSocket.getLocalPort();
+ remotePort = clientConnectionSocket.getPort();
+
+
+
+ // 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 ))
+ // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+ // Why is the first IP/port the same, while the second set has different ports?
+ System.out.println("FisherServer socket pair showing host name, address, port:");
+ System.out.println(" (( "
+ + localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( "
+ + remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+ is = clientConnectionSocket.getInputStream();
+ isr = new InputStreamReader(is);
+ br = new BufferedReader(isr);
+
+ if (localAddress.getHostName().equals(localAddress.getHostAddress())
+ || remoteAddress.getHostName().equals(remoteAddress.getHostAddress())) {
+ System.out.println(" note HostName matches address if host has no DNS name");
+ }
+
+ // Notice the use of flush() and try w/ resources. Without
+ // the try w/ resources the Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. try w/ resources explicitly ends the connection.
+ serverLoopCount++;
+ ps.flush();
+ // like it or not, you're outta here!
+ }
+ }
+ } catch (IOException e) {
+ System.err.println("Problem with FisherServer networking: " + 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!");
+ }
+ }
+ }
+
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/Homework_2_Event_Graph.pdf b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/Homework_2_Event_Graph.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..d4f2f7a2497d7b7652d2a3adb96212937e697836
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diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/Homework_2_Event_Graph.pptx b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/Homework_2_Event_Graph.pptx
new file mode 100644
index 0000000000000000000000000000000000000000..149c22fae889fd01b20b709bc824e092980b6cbc
Binary files /dev/null and b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/Homework_2_Event_Graph.pptx differ
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/Homework_2_Screenshot.png b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/Homework_2_Screenshot.png
new file mode 100644
index 0000000000000000000000000000000000000000..fed97ba2a661bd59363c4e377859ee5dc9a4ac35
Binary files /dev/null and b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Fisher/Homework_2_Screenshot.png differ
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Leckie/LeckieClient.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Leckie/LeckieClient.java
new file mode 100644
index 0000000000000000000000000000000000000000..3dac42ae73832877e0eeeb318db292023e0532af
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Leckie/LeckieClient.java
@@ -0,0 +1,86 @@
+package MV3500Cohort2021JulySeptember.homework2.Leckie;
+import java.io.*;
+import java.net.*;
+
+/**
+ *
+ * @author Jacob Leckie
+ */
+public class LeckieClient {
+
+ /** 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;
+
+ try {
+ while (true)
+ {
+ clientLoopCount++; // increment at beginning of loop for reliability
+ System.out.println(LeckieClient.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("==================================================");
+
+// System.out.print ("Client loop " + clientLoopCount + ": ");
+ System.out.println("I dont want to clean my room!");
+ 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(500l); // slow things down, for example 500l (long) = 500 msec (1/2 second)
+
+ } // end while(true) // infinite loops are dangerous, be sure to kill this process!
+ }
+ catch (IOException e)
+ {
+ System.err.println("Problem with " + LeckieClient.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(LeckieClient.class.getName() + " exit");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Leckie/LeckieServer.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Leckie/LeckieServer.java
new file mode 100644
index 0000000000000000000000000000000000000000..4b4ab8ea7087ccfaa687cbd4ae9fed1c69192ad4
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Leckie/LeckieServer.java
@@ -0,0 +1,88 @@
+package MV3500Cohort2021JulySeptember.homework2.Leckie;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ *
+ * @author Jacob Leckie
+ */
+public class LeckieServer {
+
+ /**
+ * Program invocation, execution starts here
+ * If already compiled, can run using console in directory ../../build/classes/ by invoking \
+ * java -classpath . TcpExamples.TcpExample3Server
+ * @param args command-line arguments
+ */
+ public static void main(String[] args) {
+ try {
+
+ // ServerSocket waits for a connection from a client.
+ // Notice that it is outside the loop; ServerSocket
+ // needs to be made only once.
+ System.out.println(LeckieServer.class.getName() + " has started..."); // it helps debugging to put this on console first
+
+ ServerSocket serverSocket = new ServerSocket(2317);
+ OutputStream os;
+ 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.
+ // Stop the program somewhere else.
+ while (true) {
+
+ // block until connected to a client
+ 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("I told you " + serverLoopCount + " time, go clean your room!"); // 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).
+ localAddress = clientConnectionSocket.getLocalAddress();
+ 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 ))
+ // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+
+ // Why is the first IP/port the same, while the second set has different ports?
+ System.out.println(LeckieServer.class.getName() + " socket pair showing host name, address, port:");
+ System.out.println(" (( " +
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " +
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+ if ( localAddress.getHostName().equals( localAddress.getHostAddress()) ||
+ remoteAddress.getHostName().equals(remoteAddress.getHostAddress()))
+ System.out.println(" note HostName matches address if host has no DNS name");
+
+ // Notice the use of flush() and try w/ resources. Without
+ // the try w/ resources the Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. try w/ resources explicitly ends the connection.
+ ps.flush();
+ // like it or not, you're outta here!
+ }
+ }
+ } catch (IOException e) {
+ System.err.println("Problem with " + LeckieServer.class.getName() + " networking: " + 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!");
+ }
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/McNeely/McNeelyTCPExample3Client.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/McNeely/McNeelyTCPExample3Client.java
new file mode 100644
index 0000000000000000000000000000000000000000..8e495a0b9649ac5266259d5ba73a5546a2d054b0
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/McNeely/McNeelyTCPExample3Client.java
@@ -0,0 +1,93 @@
+package MV3500Cohort2021JulySeptember.homework2.McNeely;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * 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 jrm_u
+ */
+public class McNeelyTCPExample3Client {
+
+ /** 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;
+
+ try {
+ while (true)
+ {
+ clientLoopCount++; // increment at beginning of loop for reliability
+ System.out.println(McNeelyTCPExample3Client.class.getName() + "McNeely 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("==================================================");
+
+ System.out.print ("Client loop " + clientLoopCount + ": ");
+ System.out.println("now we're cooking with diesel fuel!");
+ 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(500l); // 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 " + McNeelyTCPExample3Client.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(McNeelyTCPExample3Client.class.getName() + " exit");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/McNeely/McNeelyTCPExample3Server.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/McNeely/McNeelyTCPExample3Server.java
new file mode 100644
index 0000000000000000000000000000000000000000..c1b312f2008c6033a0eabb3c1f30e953f3089771
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/McNeely/McNeelyTCPExample3Server.java
@@ -0,0 +1,102 @@
+package MV3500Cohort2021JulySeptember.homework2.McNeely;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * Very slightly more complex than example1, further modifying example2. The
+ * only thing this does differently is introduce a loop into the response, so
+ * you don't have to restart the program after one response. Also, it prints out
+ * the socket pair the server sees. Run the program via telnet several times and
+ * compare the socket pairs.
+ *
+ * telnet (nc) localhost 2317
+ *
+ * If you're sophisticated you can contact the instructor's computer while
+ * running this program.
+ *
+ * telnet (nc) [ipNumberOfServerLaptop] 2317
+ *
+ * and have the instructor display the socket pairs received.
+ *
+ * @author jrm_u
+ */
+public class McNeelyTCPExample3Server {
+
+ /**
+ * Program invocation, execution starts here
+ * If already compiled, can run using console in directory ../../build/classes/ by invoking \
+ * java -classpath . TcpExamples.TcpExample3Server
+ * @param args command-line arguments
+ */
+ public static void main(String[] args) {
+ try {
+
+ // ServerSocket waits for a connection from a client.
+ // Notice that it is outside the loop; ServerSocket
+ // needs to be made only once.
+ System.out.println(McNeelyTCPExample3Server.class.getName() + " has started... here we go!"); // it helps debugging to put this on console first
+
+ ServerSocket serverSocket = new ServerSocket(2317);
+ OutputStream os;
+ 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.
+ // Stop the program somewhere else.
+ while (true) {
+
+ // block until connected to a client
+ 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 is response number " + serverLoopCount + " produced by Justin's 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).
+ localAddress = clientConnectionSocket.getLocalAddress();
+ 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 ))
+ // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+
+ // Why is the first IP/port the same, while the second set has different ports?
+ System.out.println(McNeelyTCPExample3Server.class.getName() + " socket pair showing host name, address, port:");
+ System.out.println(" (( " +
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " +
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+ if ( localAddress.getHostName().equals( localAddress.getHostAddress()) ||
+ remoteAddress.getHostName().equals(remoteAddress.getHostAddress()))
+ System.out.println(" note HostName matches address if host has no DNS name");
+
+ // Notice the use of flush() and try w/ resources. Without
+ // the try w/ resources the Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. try w/ resources explicitly ends the connection.
+ ps.flush();
+ // like it or not, you're outta here!
+ }
+ }
+ } catch (IOException e) {
+ System.err.println("Problem with " + McNeelyTCPExample3Server.class.getName() + " networking: " + 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!");
+ }
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/MorrisTCPExample3Client.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/MorrisTCPExample3Client.java
new file mode 100644
index 0000000000000000000000000000000000000000..1eb66d23a88cb5160dba541a39bb75dd06e608df
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/MorrisTCPExample3Client.java
@@ -0,0 +1,94 @@
+
+
+package MV3500Cohort2021JulySeptember.homework2.Morris;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ *
+ * @author johnmorris
+ */
+public class MorrisTCPExample3Client {
+
+
+
+
+ /** 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;
+
+ try {
+ while (true)
+ {
+ clientLoopCount++; // increment at beginning of loop for reliability
+ System.out.println(MorrisTCPExample3Client.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("Half Way Thru Quarter");
+
+ System.out.print ("Client loop " + clientLoopCount + ": ");
+ System.out.println("now we can coordinate weekend Party!");
+ 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(500l); // slow things down, for example 500l (long) = 500 msec (1/2 second)
+
+ } // end while(true) // infinite loops are dangerous, be sure to kill this process!
+ }
+ catch (IOException e)
+ {
+ System.err.println("Problem with " + MorrisTCPExample3Client.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(MorrisTCPExample3Client.class.getName() + " exit");
+ }
+ }
+}
+
+
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/MorrisTcpExample3Server.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/MorrisTcpExample3Server.java
new file mode 100644
index 0000000000000000000000000000000000000000..8c2d7155a4c86034a2a789c8e80e29aee60303da
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/MorrisTcpExample3Server.java
@@ -0,0 +1,104 @@
+
+package MV3500Cohort2021JulySeptember.homework2.Morris;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * Very slightly more complex than example1, further modifying example2. The
+ * only thing this does differently is introduce a loop into the response, so
+ * you don't have to restart the program after one response. Also, it prints out
+ * the socket pair the server sees. Run the program via telnet several times and
+ * compare the socket pairs.
+ *
+ * telnet (nc) localhost 2317
+ *
+ * If you're sophisticated you can contact the instructor's computer while
+ * running this program.
+ *
+ * telnet (nc) [ipNumberOfServerLaptop] 2317
+ *
+ * and have the instructor display the socket pairs received.
+ *
+ * @author mcgredo
+ *
+ */
+public class MorrisTcpExample3Server {
+
+ /**
+ * Program invocation, execution starts here
+ * If already compiled, can run using console in directory ../../build/classes/ by invoking \
+ * java -classpath . TcpExamples.TcpExample3Server
+ * @param args command-line arguments
+ */
+ public static void main(String[] args) {
+ try {
+
+ // ServerSocket waits for a connection from a client.
+ // Notice that it is outside the loop; ServerSocket
+ // needs to be made only once.
+ System.out.println(MorrisTcpExample3Server.class.getName() + " is rolling..."); // it helps debugging to put this on console first
+
+ ServerSocket serverSocket = new ServerSocket(2317);
+ OutputStream os;
+ 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.
+ // Stop the program somewhere else.
+ while (true) {
+
+ // block until connected to a client
+ 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 is response " + serverLoopCount + " produced by the Morris 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).
+ localAddress = clientConnectionSocket.getLocalAddress();
+ 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 ))
+ // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+
+ // Why is the first IP/port the same, while the second set has different ports?
+ System.out.println(MorrisTcpExample3Server.class.getName() + " socket pair showing host name, address, port:");
+ System.out.println(" (( " +
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " +
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+ if ( localAddress.getHostName().equals( localAddress.getHostAddress()) ||
+ remoteAddress.getHostName().equals(remoteAddress.getHostAddress()))
+ System.out.println(" note HostName matches address if host has no DNS name");
+
+ // Notice the use of flush() and try w/ resources. Without
+ // the try w/ resources the Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. try w/ resources explicitly ends the connection.
+ ps.flush();
+ // like it or not, you're outta here!
+ }
+ }
+ } catch (IOException e) {
+ System.err.println("Problem with " + MorrisTcpExample3Server.class.getName() + " networking: " + 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!");
+ }
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/Screen_Shot_2021-08-06_at_10.27.59_AM.png b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/Screen_Shot_2021-08-06_at_10.27.59_AM.png
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diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/UML_HW_2_Morris.pdf b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/UML_HW_2_Morris.pdf
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diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/UML_HW_2_Morris.pptx b/assignments/src/MV3500Cohort2021JulySeptember/homework2/Morris/UML_HW_2_Morris.pptx
new file mode 100644
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diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/ReynoldsTcpExample3Client.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/ReynoldsTcpExample3Client.java
new file mode 100644
index 0000000000000000000000000000000000000000..7d5dbec55a350f8ac33103692a6c7f93abd7d2fe
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/ReynoldsTcpExample3Client.java
@@ -0,0 +1,95 @@
+package MV3500Cohort2021JulySeptember.homework2;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * 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
+ * @author reynolds
+ */
+public class ReynoldsTcpExample3Client {
+
+ /** 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;
+
+ try {
+ while (true)
+ {
+ clientLoopCount++; // increment at beginning of loop for reliability
+ System.out.println(ReynoldsTcpExample3Client.class.getName() + " looking for an empire to join...");
+
+ // 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("==================================================");
+
+ System.out.print ("Client # " + clientLoopCount + ": ");
+ System.out.println("I've sided with the empire!");
+ System.out.println("The the serverlord has spoken... it said: '" + serverMessage + "' \n" );
+ // socket gets closed, either automatically/silently by this code (or possibly by the server)
+
+ Thread.sleep(500l); // 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 " + ReynoldsTcpExample3Client.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(ReynoldsTcpExample3Client.class.getName() + " exit");
+ }
+ }
+}
diff --git a/assignments/src/MV3500Cohort2021JulySeptember/homework2/ReynoldsTcpExample3Server.java b/assignments/src/MV3500Cohort2021JulySeptember/homework2/ReynoldsTcpExample3Server.java
new file mode 100644
index 0000000000000000000000000000000000000000..f56e658ebdb33b6c5d00f5ad7b3e96a16511ad10
--- /dev/null
+++ b/assignments/src/MV3500Cohort2021JulySeptember/homework2/ReynoldsTcpExample3Server.java
@@ -0,0 +1,104 @@
+package MV3500Cohort2021JulySeptember.homework2;
+
+import java.io.*;
+import java.net.*;
+
+/**
+ * Very slightly more complex than example1, further modifying example2. The
+ * only thing this does differently is introduce a loop into the response, so
+ * you don't have to restart the program after one response. Also, it prints out
+ * the socket pair the server sees. Run the program via telnet several times and
+ * compare the socket pairs.
+ *
+ * telnet (nc) localhost 2317
+ *
+ * If you're sophisticated you can contact the instructor's computer while
+ * running this program.
+ *
+ * telnet (nc) [ipNumberOfServerLaptop] 2317
+ *
+ * and have the instructor display the socket pairs received.
+ *
+ * @author mcgredo
+ * @author brutzman
+ * @author reynolds
+ */
+public class ReynoldsTcpExample3Server {
+
+ /**
+ * Program invocation, execution starts here
+ * If already compiled, can run using console in directory ../../build/classes/ by invoking \
+ * java -classpath . TcpExamples.TcpExample3Server
+ * @param args command-line arguments
+ */
+ public static void main(String[] args) {
+ try {
+
+ // ServerSocket waits for a connection from a client.
+ // Notice that it is outside the loop; ServerSocket
+ // needs to be made only once.
+ System.out.println(ReynoldsTcpExample3Server.class.getName() + " has started hosting, looking for a new client to pad my empire..."); // it helps debugging to put this on console first
+
+ ServerSocket serverSocket = new ServerSocket(2317);
+ OutputStream os;
+ 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.
+ // Stop the program somewhere else.
+ while (true) {
+
+ // block until connected to a client
+ 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("Thank you client " + serverLoopCount + ", you have added to my growing empire!"); // 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).
+ localAddress = clientConnectionSocket.getLocalAddress();
+ 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 ))
+ // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
+
+ // Why is the first IP/port the same, while the second set has different ports?
+ System.out.println(ReynoldsTcpExample3Server.class.getName() + " socket pair showing host name, address, port:");
+ System.out.println(" (( " +
+ localAddress.getHostName() + "=" + localAddress.getHostAddress() + ", " + localPort + " ), ( " +
+ remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+
+ if ( localAddress.getHostName().equals( localAddress.getHostAddress()) ||
+ remoteAddress.getHostName().equals(remoteAddress.getHostAddress()))
+ System.out.println(" note HostName matches address if host has no DNS name");
+
+ // Notice the use of flush() and try w/ resources. Without
+ // the try w/ resources the Socket object may stay open for
+ // a while after the client has stopped needing this
+ // connection. try w/ resources explicitly ends the connection.
+ ps.flush();
+ // like it or not, you're outta here!
+ }
+ }
+ } catch (IOException e) {
+ System.err.println("Problem with " + ReynoldsTcpExample3Server.class.getName() + " networking: " + 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!");
+ }
+ }
+ }
+}
diff --git a/examples/src/OpenDis7Examples/images/Example4SequenceDiagram.png b/examples/src/OpenDis7Examples/images/Example4SequenceDiagram.png
deleted file mode 100644
index 3eb3a8e753d2e7aea1baf4a1366b06397446f829..0000000000000000000000000000000000000000
Binary files a/examples/src/OpenDis7Examples/images/Example4SequenceDiagram.png and /dev/null differ
diff --git a/examples/src/OpenDis7ExamplesAllPduScreenCapture.png b/examples/src/OpenDis7Examples/images/OpenDis7ExamplesAllPduScreenCapture.png
similarity index 100%
rename from examples/src/OpenDis7ExamplesAllPduScreenCapture.png
rename to examples/src/OpenDis7Examples/images/OpenDis7ExamplesAllPduScreenCapture.png
diff --git a/examples/src/TcpExamples/TcpExample2ConnectionCounting.java b/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
index 3b99cfa68f3a0fed2c85be70edf23cf7b71843f5..c1b62609c7d5c46014b06f0ce7db5b8f24e36be9 100644
--- a/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
+++ b/examples/src/TcpExamples/TcpExample2ConnectionCounting.java
@@ -36,7 +36,7 @@ public class TcpExample2ConnectionCounting
System.out.println(" Windows ipconfig (or Mac ifconfig) indicates current IPv4_Address (for example local wireless IP address)");
System.out.println(" Windows enter (telnet localhost 2317) or Mac enter (nc localhost 2317) for loopback operation, or" );
System.out.println(" Windows enter (telnet IPv4_Address 2317) or Mac enter (nc IPv4_Address 2317) for LAN operation" );
- System.out.println("TcpExample2ConnectionCounting server standing by..." );
+ System.out.println("TcpExample2ConnectionCounting server standing by..." );
// ServerSocket waits for a connection from a client.
// Notice that it is outside the loop; ServerSocket needs to be made only once.
diff --git a/examples/src/TcpExamples/TcpExample3Client.java b/examples/src/TcpExamples/TcpExample3Client.java
index 2151b5fc37ab3f356cbc014575a1a9a4dfe09de7..9d1fe38c29b76dd970327eb7744ec5803aab4dfa 100644
--- a/examples/src/TcpExamples/TcpExample3Client.java
+++ b/examples/src/TcpExamples/TcpExample3Client.java
@@ -47,7 +47,7 @@ public class TcpExample3Client {
// 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?
+ socket = new Socket(LOCALHOST, 2317); // locohost?
// Now hook everything up (i.e. set up the streams), Java style:
is = socket.getInputStream();
@@ -65,7 +65,7 @@ public class TcpExample3Client {
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(500l); // slow things down, for example 500l (long) = 500 msec
+ Thread.sleep(500l); // slow things down, for example 500l (long) = 500 msec (1/2 second)
} // end while(true) // infinite loops are dangerous, be sure to kill this process!
}
diff --git a/examples/src/TcpExamples/TcpExample4SequenceDiagram.png b/examples/src/TcpExamples/TcpExample4SequenceDiagram.png
index 12e6378d530803907f66ea638b8844fdc116dded..3eb3a8e753d2e7aea1baf4a1366b06397446f829 100644
Binary files a/examples/src/TcpExamples/TcpExample4SequenceDiagram.png and b/examples/src/TcpExamples/TcpExample4SequenceDiagram.png differ
diff --git a/examples/src/OpenDis7Examples/images/Example4SequenceDiagram.vsdx b/examples/src/TcpExamples/TcpExample4SequenceDiagram.vsdx
similarity index 100%
rename from examples/src/OpenDis7Examples/images/Example4SequenceDiagram.vsdx
rename to examples/src/TcpExamples/TcpExample4SequenceDiagram.vsdx
diff --git a/examples/src/OpenDis7Examples/images/Example4SequenceDrawing.png b/examples/src/TcpExamples/TcpExample4SequenceSketch.png
similarity index 100%
rename from examples/src/OpenDis7Examples/images/Example4SequenceDrawing.png
rename to examples/src/TcpExamples/TcpExample4SequenceSketch.png
diff --git a/presentations/04_TCPSocketsJava.pptx b/presentations/04_TCPSocketsJava.pptx
index 19ab33d24b7c6200f38a75bb4c57db5d3268381f..23ca879f0de227bc27de42d6138ed38860fa7b5c 100644
Binary files a/presentations/04_TCPSocketsJava.pptx and b/presentations/04_TCPSocketsJava.pptx differ
diff --git a/specifications/build.xml b/specifications/build.xml
index 0c9d87fa2333bc7da87e0c064ee2d76b79c2b216..88bd1d6f7479af083ce5d0ba2a53a21ff2ea7366 100644
--- a/specifications/build.xml
+++ b/specifications/build.xml
@@ -2,6 +2,22 @@
<project name="Download IEEE and SISO Specifications" default="download.all" basedir=".">
<target name="download.all" depends="download.clean.specifications,download.SISO,download.IeeeDisStandards.instructions"/>
+
+ <property name="DIS.1.document" value="6387564"/>
+ <property name="DIS.1.rename" value="IEEE1278.1-2012.DistributedInteractiveSimulation.ApplicationProtocols.${DIS.1.document}.pdf"/>
+ <property name="DIS.1.title" value="1278.1-2012 - IEEE Standard for Distributed Interactive Simulation (DIS) -- Application Protocols"/>
+
+ <property name="DIS.2.document" value="7459689"/>
+ <property name="DIS.2.rename" value="IEEE1278.2-2015.DistributedInteractiveSimulation.CommunicationsServices.${DIS.2.document}.pdf.SAVEME"/>
+ <property name="DIS.2.title" value="1278.2-2015 - IEEE Standard for Distributed Interactive Simulation (DIS) -- Communication Services and Profiles"/>
+
+ <property name="DIS.3.document" value="587529"/>
+ <property name="DIS.3.rename" value="IEEE1278.3-2015.DistributedInteractiveSimulation.CommunicationsServices.${DIS.3.document}.pdf.SAVEME"/>
+ <property name="DIS.3.title" value="1278.3-1996 - IEEE Recommended Practice for Distributed Interactive Simulation (DIS) -- Exercise Management and Feedback"/>
+
+ <property name="DIS.4.document" value="8685803"/>
+ <property name="DIS.4.rename" value="IEEE1278.4-1997.DistributedInteractiveSimulation.VV+A.${DIS.4.document}.pdf.SAVEME"/>
+ <property name="DIS.4.title" value="1278.4-1997 - IEEE Recommended Practice for Distributed Interactive Simulation (DIS) -- Verification, Validation, and Accreditation (VV+A)"/>
<target name="download.clean.specifications">
<echo message="ensure all files are closed before deleting..."/>
@@ -25,18 +41,25 @@
<!-- =============================================== -->
<target name="download.IeeeDisStandards.rename" description="rename saved DIS specification files to readable filenames">
+ <!-- move files to subdirectory if needed -->
+ <move file="12781-2012.pdf" todir="downloads/" failonerror="false"/>
+ <move file="12782-2015.pdf" todir="downloads/" failonerror="false"/>
+ <move file="00587529.pdf" todir="downloads/" failonerror="false"/>
+ <move file="12784-1997.pdf" todir="downloads/" failonerror="false"/>
<!-- part 1 6387564.pdf -->
- <move file="12781-2012.pdf" tofile="IEEE1278.1-2012.DistributedInteractiveSimulation.ApplicationProtocols.12781-2012.pdf" verbose="true" quiet="true" failonerror="false"/>
- <copy todir="archive" file="IEEE1278.1-2012.DistributedInteractiveSimulation.ApplicationProtocols.12781-2012.pdf" verbose="true" quiet="true" failonerror="false"/>
+ <move file="downloads/12781-2012.pdf" tofile="downloads/IEEE1278.1-2012.DistributedInteractiveSimulation.ApplicationProtocols.12781-2012.pdf" verbose="true" quiet="true" failonerror="false"/>
<!-- part 2 7459689.pdf -->
- <move file="12782-2015.pdf" tofile="IEEE1278.2-2015.DistributedInteractiveSimulation.CommunicationsServices.12782-2015.pdf" verbose="true" quiet="true" failonerror="false"/>
- <copy todir="archive" file="IEEE1278.2-2015.DistributedInteractiveSimulation.CommunicationsServices.12782-2015.pdf" verbose="true" quiet="true" failonerror="false"/>
+ <move file="downloads/12782-2015.pdf" tofile="downloads/IEEE1278.2-2015.DistributedInteractiveSimulation.CommunicationsServices.12782-2015.pdf" verbose="true" quiet="true" failonerror="false"/>
<!-- part 3 00587529.pdf -->
- <move file= "00587529.pdf" tofile="IEEE1278.3-2015.DistributedInteractiveSimulation.CommunicationsServices.00587529.pdf" verbose="true" quiet="true" failonerror="false"/>
- <copy todir="archive" file="IEEE1278.3-2015.DistributedInteractiveSimulation.CommunicationsServices.00587529.pdf" verbose="true" quiet="true" failonerror="false"/>
+ <move file= "downloads/00587529.pdf" tofile="downloads/IEEE1278.3-2015.DistributedInteractiveSimulation.CommunicationsServices.00587529.pdf" verbose="true" quiet="true" failonerror="false"/>
<!-- part 4 6595010.pdf -->
- <move file="12784-1997.pdf" tofile="IEEE1278.4-2013.DistributedInteractiveSimulation.VV+A.12784-1997.pdf" verbose="true" quiet="true" failonerror="false"/>
- <copy todir="archive" file="IEEE1278.4-2013.DistributedInteractiveSimulation.VV+A.12784-1997.pdf" verbose="true" quiet="true" failonerror="false"/>
+ <move file="downloads/12784-1997.pdf" tofile="downloads/IEEE1278.4-2013.DistributedInteractiveSimulation.VV+A.12784-1997.pdf" verbose="true" quiet="true" failonerror="false"/>
+ <!--
+ <copy todir="downloads" file="IEEE1278.1-2012.DistributedInteractiveSimulation.ApplicationProtocols.12781-2012.pdf" verbose="true" quiet="true" failonerror="false"/>
+ <copy todir="downloads" file="IEEE1278.2-2015.DistributedInteractiveSimulation.CommunicationsServices.12782-2015.pdf" verbose="true" quiet="true" failonerror="false"/>
+ <copy todir="downloads" file="IEEE1278.3-2015.DistributedInteractiveSimulation.CommunicationsServices.00587529.pdf" verbose="true" quiet="true" failonerror="false"/>
+ <copy todir="downloads" file="IEEE1278.4-2013.DistributedInteractiveSimulation.VV+A.12784-1997.pdf" verbose="true" quiet="true" failonerror="false"/>
+ -->
<echo message="check *.pdf directory contents..."/>
<!-- https://stackoverflow.com/questions/10528032/listing-all-files-and-subdirectories-using-ant -->
@@ -45,11 +68,11 @@
<!-- https://stackoverflow.com/questions/7102793/how-to-put-a-newline-in-ant-property -->
<echo message="specifications directory:"/>
<echo message="${prop.dist.contents}"/>
- <fileset id="archive.contents" dir="archive" includes="*.pdf"/>
- <property name="prop.archive.contents" refid="archive.contents"/>
+ <fileset id="downloads.contents" dir="downloads" includes="*.pdf"/>
+ <property name="prop.downloads.contents" refid="downloads.contents"/>
<!-- https://stackoverflow.com/questions/7102793/how-to-put-a-newline-in-ant-property -->
- <echo message="specifications/archive directory:"/>
- <echo message="${prop.archive.contents}"/>
+ <echo message="specifications/downloads directory:"/>
+ <echo message="${prop.downloads.contents}"/>
</target>
<!-- =============================================== -->
@@ -63,58 +86,60 @@
<echo message="Warning: due to cookie and scripting restrictions, you must download IEEE specifications manually via links found in README.md"/>
<echo message="TODO: university students/faculty can first login with permissions to the IEEE Explore page, then use target download.IeeeDisStandards.retrieve"/>
<echo message="IEEE Explore: ${ieeeExploreUrl}"/>
+ <echo/>
<!-- ======================== -->
- <property name="DIS.1.document" value="6387564"/>
- <property name="DIS.1.rename" value="IEEE1278.1-2012.DistributedInteractiveSimulation.ApplicationProtocols.${DIS.1.document}.pdf"/>
- <echo message="see ${ieeeBasePageUrl}${DIS.1.document}"/>
+ <echo message="${DIS.1.title}"/>
+ <echo message="see ${ieeeBasePageUrl}${DIS.1.document}"/>
<echo message="get ${ieeeBaseLinkUrl}${DIS.1.document}"/>
+ <echo message="to downloads/ subdirectory"/>
<echo message="as ${DIS.1.rename}"/>
<!--
<get src="${ieeeBaseLinkUrl}${DIS.1.document}"
- dest="${DIS.1.rename}" verbose="true"/> -->
+ dest="downloads/${DIS.1.rename}" verbose="true"/> -->
<property name="warningMessage" value="Restriction: cookie restrictions prevent automated download. You must manually download this file while within NPS campus or firewall. For "/>
<echo message="${warningMessage}IEEE1278.1 retrieval to this location, use your browser to save ${ieeeBaseLinkUrl}${DIS.1.document}"
file="${DIS.1.rename}.SAVEME"/>
- <echo message=""/>
+ <echo/>
<!-- ======================== -->
- <property name="DIS.2.document" value="7459689"/>
- <property name="DIS.2.rename" value="IEEE1278.2-2015.DistributedInteractiveSimulation.CommunicationsServices.${DIS.2.document}.pdf.SAVEME"/>
- <echo message="see ${ieeeBasePageUrl}${DIS.2.document}"/>
+ <echo message="${DIS.2.title}"/>
+ <echo message="see ${ieeeBasePageUrl}${DIS.2.document}"/>
<echo message="get ${ieeeBaseLinkUrl}${DIS.2.document}"/>
+ <echo message="to downloads/ subdirectory"/>
<echo message="as ${DIS.2.rename}"/>
<!--
<get src="${ieeeBaseLinkUrl}${DIS.2.document}"
- dest="${DIS.2.rename}" verbose="true"/> -->
+ dest="downloads/${DIS.2.rename}" verbose="true"/> -->
<echo message="${warningMessage}IEEE1278.2 retrieval to this location, use your browser to save ${ieeeBaseLinkUrl}${DIS.2.document}"
file="${DIS.2.rename}"/>
- <echo message=""/>
+ <echo/>
<!-- ======================== -->
- <property name="DIS.3.document" value="587529"/>
- <property name="DIS.3.rename" value="IEEE1278.3-2015.DistributedInteractiveSimulation.CommunicationsServices.${DIS.3.document}.pdf.SAVEME"/>
- <echo message="see ${ieeeBasePageUrl}${DIS.3.document}"/>
+ <echo message="${DIS.3.title}"/>
+ <echo message="see ${ieeeBasePageUrl}${DIS.3.document}"/>
<echo message="get ${ieeeBaseLinkUrl}${DIS.3.document}"/>
+ <echo message="to downloads/ subdirectory"/>
<echo message="as ${DIS.3.rename}"/>
<!--
<get src="${ieeeBaseLinkUrl}${DIS.3.document}"
- dest="${DIS.3.rename}" verbose="true"/> -->
+ dest="downloads/${DIS.3.rename}" verbose="true"/> -->
<echo message="${warningMessage}IEEE1278.3 retrieval to this location, use your browser to save ${ieeeBaseLinkUrl}${DIS.3.document}"
file="${DIS.3.rename}"/>
- <echo message=""/>
+ <echo/>
<!-- ======================== -->
- <property name="DIS.4.document" value="8685803"/>
- <property name="DIS.4.rename" value="IEEE1278.4-2013.DistributedInteractiveSimulation.VV+A.${DIS.4.document}.pdf.SAVEME"/>
- <echo message="see ${ieeeBasePageUrl}${DIS.4.document}"/>
+ <echo message="${DIS.4.title}"/>
+ <echo message="see ${ieeeBasePageUrl}${DIS.4.document}"/>
<echo message="get ${ieeeBaseLinkUrl}${DIS.4.document}"/>
+ <echo message="to downloads/ subdirectory"/>
<echo message="as ${DIS.4.rename}"/>
<!--
<get src="${ieeeBaseLinkUrl}${DIS.4.document}"
- dest="${DIS.4.rename}" verbose="true"/> -->
+ dest="downloads/${DIS.4.rename}" verbose="true"/> -->
<echo message="${warningMessage}IEEE1278.4 retrieval to this location, use your browser to save ${ieeeBaseLinkUrl}${DIS.4.document}"
file="${DIS.4.rename}"/>
+ <echo/>
</target>
<target name="download.IeeeDisStandards.retrieve">
@@ -129,40 +154,40 @@
<echo message="IEEE Explore: ${ieeeExploreUrl}"/>
<!-- ======================== -->
- <property name="DIS.1.document" value="6387564"/>
- <property name="DIS.1.rename" value="IEEE1278.1-2012.DistributedInteractiveSimulation.ApplicationProtocols.${DIS.1.document}.pdf"/>
- <echo message="see ${ieeeBasePageUrl}${DIS.1.document}"/>
+ <echo message="${DIS.1.title}"/>
+ <echo message="see ${ieeeBasePageUrl}${DIS.1.document}"/>
<echo message="get ${ieeeBaseLinkUrl}${DIS.1.document}"/>
+ <echo message="to downloads/ subdirectory"/>
<echo message="as ${DIS.1.rename}"/>
<get src="${ieeeBaseLinkUrl}${DIS.1.document}"
- dest="${DIS.1.rename}" verbose="true"/>
+ dest="downloads/${DIS.1.rename}" verbose="true"/>
<!-- ======================== -->
- <property name="DIS.2.document" value="7459689"/>
- <property name="DIS.2.rename" value="IEEE1278.2-2015.DistributedInteractiveSimulation.CommunicationsServices.${DIS.2.document}.pdf"/>
- <echo message="see ${ieeeBasePageUrl}${DIS.2.document}"/>
+ <echo message="${DIS.2.title}"/>
+ <echo message="see ${ieeeBasePageUrl}${DIS.2.document}"/>
<echo message="get ${ieeeBaseLinkUrl}${DIS.2.document}"/>
+ <echo message="to downloads/ subdirectory"/>
<echo message="as ${DIS.2.rename}"/>
<get src="${ieeeBaseLinkUrl}${DIS.2.document}"
- dest="${DIS.2.rename}" verbose="true"/>
+ dest="downloads/${DIS.2.rename}" verbose="true"/>
<!-- ======================== -->
- <property name="DIS.3.document" value="587529"/>
- <property name="DIS.3.rename" value="IEEE1278.3-2015.DistributedInteractiveSimulation.CommunicationsServices.${DIS.3.document}.pdf"/>
- <echo message="see ${ieeeBasePageUrl}${DIS.3.document}"/>
+ <echo message="${DIS.3.title}"/>
+ <echo message="see ${ieeeBasePageUrl}${DIS.3.document}"/>
<echo message="get ${ieeeBaseLinkUrl}${DIS.3.document}"/>
+ <echo message="to downloads/ subdirectory"/>
<echo message="as ${DIS.3.rename}"/>
<get src="${ieeeBaseLinkUrl}${DIS.3.document}"
- dest="${DIS.3.rename}" verbose="true"/>
+ dest="downloads/${DIS.3.rename}" verbose="true"/>
<!-- ======================== -->
- <property name="DIS.4.document" value="8685803"/>
- <property name="DIS.4.rename" value="IEEE1278.4-2013.DistributedInteractiveSimulation.VV+A.${DIS.4.document}.pdf"/>
- <echo message="see ${ieeeBasePageUrl}${DIS.4.document}"/>
+ <echo message="${DIS.4.title}"/>
+ <echo message="see ${ieeeBasePageUrl}${DIS.4.document}"/>
<echo message="get ${ieeeBaseLinkUrl}${DIS.4.document}"/>
+ <echo message="to downloads/ subdirectory"/>
<echo message="as ${DIS.4.rename}"/>
<get src="${ieeeBaseLinkUrl}${DIS.4.document}"
- dest="${DIS.4.rename}" verbose="true"/>
+ dest="downloads/${DIS.4.rename}" verbose="true"/>
</target>
<!-- =============================================== -->
diff --git a/specifications/downloads/README.md b/specifications/downloads/README.md
new file mode 100644
index 0000000000000000000000000000000000000000..e32e010ddf99239ccf332b3b4706f60baf9fd619
--- /dev/null
+++ b/specifications/downloads/README.md
@@ -0,0 +1 @@
+This is a convenient directory for saving downloaded specification documents.