diff --git a/examples/src/TcpExamples/TcpExample4Client.java b/examples/src/TcpExamples/TcpExample4Client.java index 7e404e708c76918a92bed311e4469a1164231138..8b29a7336ec8ed99150ac41cc89e580fbe4b1b96 100644 --- a/examples/src/TcpExamples/TcpExample4Client.java +++ b/examples/src/TcpExamples/TcpExample4Client.java @@ -5,66 +5,62 @@ import java.net.*; //import java.time.LocalTime; // conversion? /** - * This client program establishes a socket connection - * to the dispatch server, then checks how long it takes to read the single - * line it expects. - * + * This client program establishes a socket connection to the dispatch server, + * then checks how long it takes to read the single line it expects. + * * @author Don McGregor * @author Don Brutzman * @author MV3500 class */ -public class TcpExample4Client -{ +public class TcpExample4Client { + static int MAX_LOOP_COUNT = 4; - - public static void main(String[] args) - { - try - { - System.out.println("TcpExample4Client start, loop " + MAX_LOOP_COUNT + " times"); - System.out.println("=================================================="); - for (int loopCount=1; loopCount <= MAX_LOOP_COUNT; loopCount++) // loop then exit - { - System.out.println("TcpExample4Client creating socket #" + loopCount + "..."); - // 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 the Socket - // object; the server uses a ServerSocket to wait for - // connections.This particualar example is interacting - // with what it expects is a server that writes a single text - // line after 10 sec. - long startTime = System.currentTimeMillis(); + public static void main(String[] args) { + try { + System.out.println("TcpExample4Client start, loop " + MAX_LOOP_COUNT + " times"); + System.out.println("=================================================="); + for (int loopCount = 1; loopCount <= MAX_LOOP_COUNT; loopCount++) // loop then exit + { + System.out.println("TcpExample4Client creating socket #" + loopCount + "..."); + + // 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 the Socket + // object; the server uses a ServerSocket to wait for + // connections.This particualar example is interacting + // with what it expects is a server that writes a single text + // line after 10 sec. + long startTime = System.currentTimeMillis(); // open a socket for each loop - Socket socket = new Socket("localhost", 2317); + Socket socket = new Socket("localhost", 2317); - // Setup. Read the single line written by the server. - // We'd do things a bit differently if many lines to be read - // from the server, instead of one only. - InputStream is = socket.getInputStream(); - InputStreamReader isr = new InputStreamReader(is); - BufferedReader br = new BufferedReader(isr); - - String serverMessage = br.readLine(); // blocks - long readTime = System.currentTimeMillis(); - long timeLength = readTime - startTime; + // Setup. Read the single line written by the server. + // We'd do things a bit differently if many lines to be read + // from the server, instead of one only. + InputStream is = socket.getInputStream(); + InputStreamReader isr = new InputStreamReader(is); + BufferedReader br = new BufferedReader(isr); - System.out.println("TcpExample4Client: message received from server='" + serverMessage + "'"); - System.out.println("TcpExample4Client: time msec required for read=" + timeLength); - System.out.println("=================================================="); - // To push this further, launch multiple copies of TcpExample4Client simultaneously - } - System.out.println("TcpExample4Client complete"); + String serverMessage = br.readLine(); // blocks + long readTime = System.currentTimeMillis(); + long timeLength = readTime - startTime; + + System.out.println("TcpExample4Client: message received from server='" + serverMessage + "'"); + System.out.println("TcpExample4Client: time msec required for read=" + timeLength); + System.out.println("=================================================="); + // To push this further, launch multiple copies of TcpExample4Client simultaneously + } + System.out.println("TcpExample4Client complete"); // main method now exits - } - catch(IOException e) - { + } catch (IOException e) { System.out.println("Problem with TcpExample4Client networking:networking:"); // describe what is happening System.out.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) + if (e instanceof java.net.BindException) { System.out.println("*** Be sure to stop any other running instances of programs using this port!"); + } } } -} \ No newline at end of file +}