Modify parameters, add grep and clean code

src/main/java/cs425/mp1/Client.java

@@ -16,16 +16,14 @@ public class Client {
                 .defaultHelp(true)
                 .description("Run distributed grep.");
         /*
-        config file is a text file has format: <server_host> <server_port> <log_file>
+        Config file is a text file has format: <server_host> <server_port> <log_file>
          */
         parser.addArgument("-cf","--configFile").nargs("?")
                 .help("Path of the config file containing list of host and its port");
-        /*
-        Options of grep command
-         */
-        parser.addArgument("-w").nargs("*")
-                .help("This prints lines that match a pattern");
+        parser.addArgument("--command").nargs("*")
+                .help("Put command of grep: <grep_options> <string_to_match>");
 
+        /* Read input arguments  */
         Namespace ns = null;
         try {
             ns = parser.parseArgs(args);
@@ -34,18 +32,12 @@ public class Client {
             System.exit(1);
         }
 
+        /* Read config file */
         FileReader file = new FileReader(ns.getString("configFile"));
         BufferedReader reader = new BufferedReader(file);
 
-        /*
-        Read server hosts, ports, and log files
-         */
-//        ArrayList<String> servers = new ArrayList<>();
-//        ArrayList<Integer> ports = new ArrayList<>();
-//        ArrayList<String> logFiles = new ArrayList<>();
-
+        /* Read server hosts, ports, and log files */
         ArrayList<ServerConf> servers = new ArrayList<>();
-
         String line;
         while (true) {
             line = reader.readLine();
@@ -62,8 +54,9 @@ public class Client {
             }
         }
 
-        String pattern = (String) ns.getList("w").get(0);
-        pattern = "-w " + pattern;
+        /* Read grep command */
+        String pattern = String.join(" ", ns.getList("command"));
+        pattern = "-" + pattern;
 
         /*
         Creating threads based on number of servers
@@ -76,9 +69,7 @@ public class Client {
             t.start();
         }
 
-        /*
-        End threads
-         */
+        /* End threads */
         for (GrepThread t: threads) {
             try {
                 t.join();

src/main/java/cs425/mp1/Grep.java

@@ -7,15 +7,9 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class Grep {
-    List<String> cmd = new ArrayList<>();
-    public Grep(String pattern) {
-        this.cmd.add("/bin/sh");
-        this.cmd.add("-c");
-        this.cmd.add("grep --color=always " + pattern);
-    }
-
-    public List<String> run_cmd() throws IOException {
-        System.out.println(cmd);
+    public static List<String> run_cmd(String pattern) throws IOException {
+        String[] cmd = {"/bin/sh", "-c", "grep --color=always " + pattern};
+//        System.out.println(cmd);
         ProcessBuilder prc_builder = new ProcessBuilder(cmd);
         Process process = prc_builder.start();
         BufferedReader input = new BufferedReader

src/main/java/cs425/mp1/GrepThread.java

@@ -24,10 +24,16 @@ public class GrepThread extends Thread{
             Socket socket = new Socket(host, port);
             socket.setSoTimeout(5000);
 
+            /*
+            Creat output stream to send to servers
+             */
             ObjectOutputStream outputStream = new ObjectOutputStream(socket.getOutputStream());
             outputStream.writeObject(pattern + " " + logFile);
             System.out.println("Connected to server. Running grep job...");
 
+            /*
+            Get input from servers and display results of query
+             */
             ObjectInputStream inputStream = new ObjectInputStream(socket.getInputStream());
             String output = (String) inputStream.readObject();
             System.out.println("-----------------------------");

src/main/java/cs425/mp1/Main.java

@@ -8,6 +8,9 @@ import net.sourceforge.argparse4j.inf.Namespace;
 public class Main {
 
     public static void main(String[] args) {
+        /*
+        Server side only need input port number
+         */
         ArgumentParser parser = ArgumentParsers.newArgumentParser("Main")
                 .defaultHelp(true)
                 .description("Run grep server.");

src/main/java/cs425/mp1/Server.java

 package cs425.mp1;
 
-import java.io.*;
-import java.net.*;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.ServerSocket;
+import java.net.Socket;
 
 public class Server {
     private int port;
@@ -11,16 +14,19 @@ public class Server {
     public Server(int port) {
         this.port = port;
         try {
+            /* Establish socket to client */
             server = new ServerSocket(port);
             System.out.println("Server start listening on port "+ port);
-
             socket = server.accept();
             System.out.println("Client connected");
+
+            /*
+            Input command from client and call Grep class to execute, then return output to output stream
+             */
             ObjectInputStream inputStream = new ObjectInputStream(socket.getInputStream());
             try {
                 String mess = (String) inputStream.readObject();
-                Grep grep = new Grep(mess);
-                String res = String.join("\n", grep.run_cmd());
+                String res = String.join("\n", Grep.run_cmd(mess));
                 System.out.println(res);
 
                 ObjectOutputStream outputStream = new ObjectOutputStream(socket.getOutputStream());

src/main/java/cs425/mp1/ServerConf.java

 package cs425.mp1;
 
+/**
+ * This class is specified configurations for Server
+ */
 public class ServerConf {
     private final String host;
     private final int port;