@Override
public void reduce(Text key, Iterable<Text> values, Context context)
throws IOException, InterruptedException {
h.clear();
String usr = key.toString();
String arr = values.toString();
int cnt = 0;
int counter = 0;
int counter2 = 0;
LinkedList<String> v = new LinkedList<String>();
for (Text value : values) {
v.add(value.toString());
}
String tp = "";
// boolean is_friend = false;
for (String value : v) {
counter2 += 1;
}
for (String value : v) {
// System.out.println(counter2);
String c = value.split(",")[1];
String friend = value.toString().split(",")[0];
int temp = 1;
if (c.equals("-1")) {
return;
}
if (h.containsKey(friend)) {
int count_temp = h.get(friend);
h.put(friend, count_temp + 1);
} else {
h.put(friend, 1);
}
// System.out.println(" Value - " + h.get(friend)); // works fine till here
// System.out.println("User key - " + usr + " Friend to add in HashMap - " + friend + "
// Count - " + h.get(friend) + " hashmap size - " + h.size());
cnt++;
// System.out.println("Size of HashMap : " + h.size());
counter++;
if (cnt == 10) {
tp = value.toString();
// System.out.println("In If");
}
if (counter == counter2 - 1) {
users_2 = new String[h.size()];
counts = new Integer[h.size()];
Iterator it = h.entrySet().iterator();
int ind = 0;
for (String name : h.keySet()) {
// Map.Entry pair = (Map.Entry)it.next();
// System.out.println(name + " -> " + h.get(name));
users_2[ind] = name;
counts[ind] = (Integer) h.get(name);
// it.remove(); // avoids a ConcurrentModificationException
ind++;
}
for (int k = 0; k < users_2.length - 1; k++)
for (int j = k; j < users_2.length; j++) {
if (counts[k] < counts[j]) {
String tmp3;
int tmp4;
tmp4 = counts[k];
counts[k] = counts[j];
counts[j] = tmp4;
tmp3 = users_2[k];
users_2[k] = users_2[j];
users_2[j] = tmp3;
}
if (counts[k] > counts[j]) {
String tmp3;
int tmp4;
tmp4 = counts[k];
counts[k] = counts[j];
counts[j] = tmp4;
tmp3 = users_2[k];
users_2[k] = users_2[j];
users_2[j] = tmp3;
}
}
String recommended_friends = "";
if (users_2.length > 0 && users_2.length < 10)
for (int i = 0; i < users_2.length; i++) recommended_friends += users_2[i] + ",";
else for (int i = 0; i < 10; i++) recommended_friends += users_2[i] + ",";
Text user_ID = new Text(usr);
Text recommendations = new Text(recommended_friends);
context.write(user_ID, recommendations);
}
/*
users_2 = new String[h.size()];
counts = new Integer[h.size()];
System.out.println("Size of HashMap : " + h.size());
//System.out.println("Users size - " + users_2.length);
//System.out.println("Counts size - " + counts.length);
/*
Iterator it = h.entrySet().iterator();
int ind = 0;
for (String name: h.keySet()){
//Map.Entry pair = (Map.Entry)it.next();
System.out.println(name + " -> " + h.get(name));
//users_2[ind] = name;
//counts[ind] = (Integer) h.get(name);
//it.remove(); // avoids a ConcurrentModificationException
ind++;
}
/*
for(int a = 0 ; a < users.size(); a++)
{ System.out.print(" In Reducer - " + users.get(a) + " ");
System.out.println(count.get(a));
}
for(int a = 0 ; a < users_2.length; a++)
{ System.out.print(" In Reducer - " + users_2[a] + " ");
System.out.println(counts[a]);
}
for(int k = 0 ; k < users_2.length - 1; k++)
for(int j = k; j< users_2.length ; j++)
{
if(counts[k]<counts[j])
{
String tmp3;
int tmp4;
tmp4 = counts[k];
counts[k] = counts[j];
counts[j] = tmp4;
tmp3 = users_2[k];
users_2[k] = users_2[j];
users_2[j] = tmp3;
}
if(counts[k]>counts[j])
{
String tmp3;
int tmp4;
tmp4 = counts[k];
counts[k] = counts[j];
counts[j] = tmp4;
tmp3 = users_2[k];
users_2[k] = users_2[j];
users_2[j] = tmp3;
}
}
String recommended_friends = "";
if(users_2.length > 0 && users_2.length < 10)
for(int i = 0; i < users_2.length; i++)
recommended_friends += users_2[i]+ ",";
else
for(int i = 0; i < 10; i++)
recommended_friends += users_2[i]+ ",";
Text user_ID = new Text(usr);
Text recommendations = new Text(recommended_friends);
context.write( user_ID, recommendations);
*/
/*
if(!is_friend)
{
String pair = key.toString();
String user1 = pair.split(",")[0];
String user2 = pair.split(",")[1];
boolean new_user_1 = true;
boolean new_user_2 = true;
for (int i = 0; i < list.size(); i++) {
if(list.get(i).user.equals(user1))
{ new_user_1 = false;
break;
}
else if (list.get(i).user.equals(user2))
{
new_user_2 = false;
break;
}
}
if(new_user_1)
{
ArrayList<String> temp1 = new ArrayList<String>();
ArrayList<Integer> temp2 = new ArrayList<Integer>();
temp1.add(user2);
temp2.add(count);
list.add(new Recommendations(user1 , temp1 , temp2 ));
}
if(new_user_2)
{
ArrayList<String> temp1 = new ArrayList<String>();
ArrayList<Integer> temp2 = new ArrayList<Integer>();
temp1.add(user1);
temp2.add(count);
list.add(new Recommendations(user2 , temp1 , temp2 ));
}
if(!new_user_1)
{
Recommendations r = null;
for (int i = 0; i < list.size(); i++) {
if(list.get(i).user.equals(user1))
{
r = list.get(i);
break;
}
}
r.possible_friends.add(user2);
r.number_of_mutual_friends.add(count);
}
if(!new_user_2)
{
Recommendations r = null;
for (int i = 0; i < list.size(); i++) {
if(list.get(i).user.equals(user2))
{
r = list.get(i);
break;
}
}
r.possible_friends.add(user1);
r.number_of_mutual_friends.add(count);
}
}
*/
}
/*
protected void cleanup(Context context) throws java.io.IOException, java.lang.InterruptedException
{
for(int i = 0; i < list.size(); i++)
{
Text user_ID = new Text();
Text recommended_friends = new Text();
String user_ID_key = "";
String recommmended_friends_value = "";
Recommendations r = list.get(i);
if(r.possible_friends.size() == 0)
{
user_ID_key = r.user;
user_ID.set(user_ID_key);
recommended_friends.set(recommmended_friends_value);
context.write(user_ID, recommended_friends);
}
else if(r.possible_friends.size() < 10)
{
user_ID_key = r.user;
user_ID.set(user_ID_key);
String[] users = new String[r.possible_friends.size()];
Integer[] counts = new Integer[r.possible_friends.size()];
users = r.possible_friends.toArray(users);
counts = r.number_of_mutual_friends.toArray(counts);
for(int k = 0 ; k < users.length ; k++)
for(int j = 0; j<i ; j++)
{
if(counts[k]<counts[j])
{
String tmp3;
int tmp4;
tmp4 = counts[k];
counts[k] = counts[j];
counts[j] = tmp4;
tmp3 = users[k];
users[k] = users[j];
users[j] = tmp3;
}
if(counts[k]>counts[j])
{
String tmp3;
int tmp4;
tmp4 = counts[k];
counts[k] = counts[j];
counts[j] = tmp4;
tmp3 = users[k];
users[k] = users[j];
users[j] = tmp3;
}
}
for(int m = 0; m < r.possible_friends.size(); m++)
recommmended_friends_value += users[m] + " ";
recommended_friends.set(recommmended_friends_value);
System.out.println(user_ID_key + " - " + recommmended_friends_value);
context.write(user_ID, recommended_friends);
}
else if(r.possible_friends.size() >= 10)
{
user_ID_key = r.user;
user_ID.set(user_ID_key);
String[] users = new String[r.possible_friends.size()];
Integer[] counts = new Integer[r.possible_friends.size()];
users = r.possible_friends.toArray(users);
counts = r.number_of_mutual_friends.toArray(counts);
for(int k = 0 ; k < users.length ; k++)
for(int j = 0; j<i ; j++)
{
if(counts[k]<counts[j])
{
String tmp3;
int tmp4;
tmp4 = counts[k];
counts[k] = counts[j];
counts[j] = tmp4;
tmp3 = users[k];
users[k] = users[j];
users[j] = tmp3;
}
if(counts[k]>counts[j])
{
String tmp3;
int tmp4;
tmp4 = counts[k];
counts[k] = counts[j];
counts[j] = tmp4;
tmp3 = users[k];
users[k] = users[j];
users[j] = tmp3;
}
}
for(int m = 0; m < 10; m++)
recommmended_friends_value += users[m] + " ";
recommended_friends.set(recommmended_friends_value);
System.out.println(user_ID_key + " - "+ recommmended_friends_value);
context.write(user_ID, recommended_friends);
}
}
}
*/
}
