modified files on 09112020

Makefile

@@ -4,7 +4,7 @@ all: clean
 	$(CC) $(CFLAGS) -o client_c client.c
 # 	g++ server.c cache.cpp -o server_s -lpthread
 # 	g++ -o cache cache.cpp
-	g++ -w -o server_s server.cpp cache.cpp -lpthread
+	g++ -w -o server_s server.cpp cache.cpp persistentStorage.cpp -lpthread
 # 	g++ -c -o cache.o cache.cpp 
 # 	g++ -o server_s server.o cache.o -lpthread
 

cache.cpp

@@ -6,6 +6,7 @@
 #include <cstdlib>
 // #include "cs_thread.h"
 #include "cache.h"
+#include "storage.h"
 using namespace std;
 /* 
  * The idea behind cache implementation :
@@ -30,7 +31,7 @@ using namespace std;
  *  
  */
 
-#define MAX_CACHE_SIZE 3
+#define MAX_CACHE_SIZE 2
 
 list<cacheNode> cache;
 unordered_map<string, list <cacheNode> :: iterator> hashTable;
@@ -90,25 +91,23 @@ void insert(string key, string value) {
     }
 }
 
-/*
- * Delete from cache
- */ 
-string DEL(string key) {
-    // printf("DEL function\n");
-    unordered_map<string, list <cacheNode> :: iterator> :: iterator it = hashTable.find(key);
-    list<cacheNode> :: iterator cnode_it = it->second;
-    cache.erase(cnode_it);
-    hashTable.erase(key);
-    /*Need to add ravi code*/
-    return "200";
-}
+
 
 string GET(string key) {
     // printf("GET function\n");
     string ans = search(key);
     /*need to add ravi code*/
     if(ans=="")
-        return "200";
+    {
+        // char *new_key=key.c_str();
+        char * new_key = new char[key.size() + 1];
+        copy(key.begin(), key.end(), new_key);
+        new_key[key.size()] = '\0';
+        string value=GETT(new_key);
+        if(value!="ERROR")
+            insert(key, value);
+        return value;
+    }
     return ans;
 }
 
@@ -116,13 +115,38 @@ string PUT(string key, string value) {
     string ans = search(key);
     if(ans == "") {
         insert(key, value);
-        /*Need to add ravi code */
     }
     else {
         unordered_map<string, list <cacheNode> :: iterator> :: iterator it = hashTable.find(key);
         it->second->value = value;
     }
-    return "200";
+    char * new_key = new char[key.size() + 1];
+    copy(key.begin(), key.end(), new_key);
+    new_key[key.size()] = '\0';
+    char * new_value = new char[value.size() + 1];
+    copy(value.begin(), value.end(), new_value);
+    new_value[value.size()] = '\0';
+    PUTT(new_key, new_value);
+    return "SUCCESS";
+}
+
+/*
+ * Delete from cache
+ */ 
+string DEL(string key) {
+    /*Need to add ravi code*/
+    string ans = search(key);
+    if(ans != "") {
+        unordered_map<string, list <cacheNode> :: iterator> :: iterator it = hashTable.find(key);
+        list<cacheNode> :: iterator cnode_it = it->second;
+        cache.erase(cnode_it);
+        hashTable.erase(key);
+    }
+    char * new_key = new char[key.size() + 1];
+    copy(key.begin(), key.end(), new_key);
+    new_key[key.size()] = '\0';
+    string response=DELL(new_key);
+    return response;
 }
 
 /* 

server.cpp

@@ -10,6 +10,7 @@
 #include "cache.h"
 
 // int search(char *p);
+pthread_mutex_t lock;
 
 void initVals(char *ip, char *portNo, int *nThreads) {
     FILE *ptr = fopen("config.txt", "r");
@@ -55,7 +56,7 @@ void *respondToClient(void *args) {
                 key_string=key;
                 output=GET(key_string);
                 // cout << key << key1 << endl;
-                cout << " GET returns : " << output << endl;
+                // cout << " GET returns : " << output << endl;
                 strcpy(converted_output, output.c_str());
                 // write(clientFd, "Get returns\0", 12);
                 write(clientFd, converted_output, output.length());
@@ -68,7 +69,7 @@ void *respondToClient(void *args) {
                 value_string=value;
                 output=PUT(key_string, value_string);
                 strcpy(converted_output, output.c_str());
-                cout << " PUT returns : " << output << endl;
+                // cout << " PUT returns : " << output << endl;
                 write(clientFd, converted_output, output.length());
                 break;
             case '3':
@@ -76,7 +77,7 @@ void *respondToClient(void *args) {
                 printf("Key: %s\n", key);
                 key_string=key;
                 output=DEL(key_string);
-                cout << " DEL returns : " << output << endl;
+                // cout << " DEL returns : " << output << endl;
                 strcpy(converted_output, output.c_str());
                 // write(clientFd, "Delete returns\0", 15);
                 write(clientFd, converted_output, output.length());
@@ -130,16 +131,18 @@ int acceptConnections(char *addr, char *portNo, int nThreads) {
     while(1) {
         int clientFd = accept(sockfd, NULL, NULL);
         printf("Connected to client with fd: %d\n", clientFd);
-        clientNo++; // shared variables hence we need conditional variable
-        int fid = fork();
-        if(fid==0) {
+        pthread_mutex_lock(&lock);
+        clientNo++;
+        pthread_mutex_unlock(&lock);
+        // int fid = fork();
+        // if(fid==0) {
             // create thread
         int *cfd = &clientFd;
         pthread_create(&clientThreads[clientNo], NULL, respondToClient, (void *)cfd);
 
-        } else {
+        // } else {
             // manage threads
-        }
+        // }
 
     }
 
@@ -150,6 +153,7 @@ int main(int argc, char **argv) {
     printf("Server is running...\n");
     char ip[20], portNo[10];
     int nThreads;
+    pthread_mutex_init(&lock, NULL);
     initVals(ip, portNo, &nThreads);
     printf("Ip address: %s\n", ip);
     printf("portno: %s\n", portNo);

storage.h

+#include <iostream>
+using namespace std;
+
+string GETT(char *);
+void PUTT(char *, char *);
+string DELL(char *);
\ No newline at end of file