Make login methods synchronized

Add synchronized modifier to the login methods, so that only one thread
at a time tries to login. All the following threads then should be able
to use the session cookies

client/src/main/java/ctbrec/ui/sites/bonga/BongaCamsSiteUi.java

@@ -44,7 +44,7 @@ public class BongaCamsSiteUi implements SiteUI {
     }
 
     @Override
-    public boolean login() throws IOException {
+    public synchronized boolean login() throws IOException {
         boolean automaticLogin = bongaCams.login();
         if(automaticLogin) {
             return true;

client/src/main/java/ctbrec/ui/sites/cam4/Cam4SiteUi.java

@@ -44,7 +44,7 @@ public class Cam4SiteUi implements SiteUI {
     }
 
     @Override
-    public boolean login() throws IOException {
+    public synchronized boolean login() throws IOException {
         boolean automaticLogin = cam4.login();
         if(automaticLogin) {
             return true;

client/src/main/java/ctbrec/ui/sites/camsoda/CamsodaSiteUi.java

@@ -45,7 +45,7 @@ public class CamsodaSiteUi implements SiteUI {
     }
 
     @Override
-    public boolean login() throws IOException {
+    public synchronized boolean login() throws IOException {
         boolean automaticLogin = camsoda.login();
         return automaticLogin;
     }

client/src/main/java/ctbrec/ui/sites/chaturbate/ChaturbateSiteUi.java

@@ -30,7 +30,7 @@ public class ChaturbateSiteUi implements SiteUI {
     }
 
     @Override
-    public boolean login() throws IOException {
+    public synchronized boolean login() throws IOException {
         return chaturbate.login();
     }
 

client/src/main/java/ctbrec/ui/sites/myfreecams/MyFreeCamsSiteUi.java

@@ -30,7 +30,7 @@ public class MyFreeCamsSiteUi implements SiteUI {
     }
 
     @Override
-    public boolean login() throws IOException {
+    public synchronized boolean login() throws IOException {
         return myFreeCams.login();
     }
 

common/src/main/java/ctbrec/sites/bonga/BongaCams.java

@@ -94,7 +94,7 @@ public class BongaCams extends AbstractSite {
     }
 
     @Override
-    public boolean login() throws IOException {
+    public synchronized boolean login() throws IOException {
         return credentialsAvailable() && getHttpClient().login();
     }
 

common/src/main/java/ctbrec/sites/cam4/Cam4.java

@@ -64,7 +64,7 @@ public class Cam4 extends AbstractSite {
     }
 
     @Override
-    public boolean login() throws IOException {
+    public synchronized boolean login() throws IOException {
         return credentialsAvailable() && getHttpClient().login();
     }
 

common/src/main/java/ctbrec/sites/camsoda/Camsoda.java

@@ -82,7 +82,7 @@ public class Camsoda extends AbstractSite {
     }
 
     @Override
-    public boolean login() throws IOException {
+    public synchronized boolean login() throws IOException {
         return credentialsAvailable() && getHttpClient().login();
     }
 

common/src/main/java/ctbrec/sites/chaturbate/Chaturbate.java

@@ -105,7 +105,7 @@ public class Chaturbate extends AbstractSite {
     }
 
     @Override
-    public boolean login() throws IOException {
+    public synchronized boolean login() throws IOException {
         return credentialsAvailable() && getHttpClient().login();
     }
 

common/src/main/java/ctbrec/sites/mfc/MyFreeCams.java

@@ -31,7 +31,7 @@ public class MyFreeCams extends AbstractSite {
     }
 
     @Override
-    public boolean login() throws IOException {
+    public synchronized boolean login() throws IOException {
         return credentialsAvailable() && getHttpClient().login();
     }