Add the handler methods into the dstore

src/Handler.java

-import java.io.*;
-import java.net.*;
-import java.util.ArrayList;
-import java.util.List;
-
-public class Handler {
-    public void handleDstoreClientReq(Socket client, Dstore dstore) throws IOException {
-
-        OutputStream out = client.getOutputStream();
-        InputStream in = client.getInputStream();
-
-        BufferedReader req = new BufferedReader(new InputStreamReader(in));
-        PrintWriter res = new PrintWriter(new OutputStreamWriter(out));
-        String line;
-
-        while((line = req.readLine()) != null) {
-            String[] tokens = line.split(" ");
-            String command = tokens[0];
-
-            if(dstore.getFiles().size() < Controller.R) {
-                res.println("ERROR_NOT_ENOUGH_DSTORES");
-                res.flush();
-            } else {
-                switch(command) {
-                    case "STORE" : {
-                        try {
-
-                            res.println("ACK");
-                            res.flush();
-                            String filename = tokens[1];
-                            int filesize = Integer.parseInt(tokens[2]);
-
-                            // read data and store the file
-                            byte[] data = new byte[filesize];
-                            client.getInputStream().readNBytes(data, 0, filesize);
-                            FileOutputStream o = new FileOutputStream(dstore.getFile_folder() +
-                                    "/" + filename);
-                            o.write(data);
-                            o.flush();
-                            o.close();
-                            dstore.getFiles().add(filename);
-
-                            if(Controller.store.containsKey(filename)) {
-                                Controller.store.get(filename).add(dstore);
-                            } else {
-                                List<Dstore> d = new ArrayList<>();
-                                d.add(dstore);
-                                Controller.store.put(filename, d);
-                            }
-
-                            PrintWriter r = new PrintWriter(new OutputStreamWriter(dstore.getControllerSocket().getOutputStream()));
-                            r.println("STORE_COMPLETE");
-
-                        } catch (IndexOutOfBoundsException e) {
-                            System.out.println("Arguments don;t match the STORE operation");
-                        }
-                    }
-                    case "LOAD_DATA" : {
-
-                        try {
-
-                            String filename = tokens[1];
-                            if(dstore.getFiles().contains(filename)) {
-                                File file = new File(dstore.getFile_folder() + "/" + filename);
-                                int n;
-                                while((n = in.read())!= -1) {
-                                    client.getOutputStream().write(n);
-                                }
-                            } else {
-                                client.close();
-                            }
-
-                        } catch (IndexOutOfBoundsException e) {
-
-                            System.out.println("Arguments don't match in LOAD operation");
-                        }
-                    }
-                }
-            }
-        }
-
-    }
-
-    public void handleDstoreControllerReq(Dstore dstore) throws IOException {
-
-        OutputStream out = dstore.getControllerSocket().getOutputStream();
-        InputStream in = dstore.getControllerSocket().getInputStream();
-
-        BufferedReader req = new BufferedReader(new InputStreamReader(in));
-        PrintWriter res = new PrintWriter(new OutputStreamWriter(out));
-        String line;
-
-        while((line = req.readLine()) != null) {
-            String[] tokens = line.split(" ");
-            String command = tokens[0];
-
-            if(dstore.getFiles().size() < Controller.R) {
-                res.println("ERROR_NOT_ENOUGH_DSTORES");
-                res.flush();
-            } else {
-                switch (command) {
-
-                    case "REMOVE" : {
-
-                        try {
-
-                            String filename = tokens[1];
-                            if(dstore.getFiles().contains(filename)) {
-                                File file = new File(dstore.getFile_folder() + "/" + filename);
-                                file.delete();
-                                Controller.store.get(filename).remove(dstore);
-                                res.println("REMOVE_ACK");
-                                res.flush();
-                            } else {
-                                res.println("ERROR_FILE_DOES_NOT_EXIST");
-                                res.flush();
-                            }
-
-                        } catch(IndexOutOfBoundsException e) {
-                            System.out.println("Arguments don't match in REMOVE opretaion");
-                        }
-
-                    }
-                }
-            }
-        }
-
-    }
-}