other: fixed rare errors on images download opening, fixed wrong code in chats and preferences store;

Mage.Client/src/main/java/mage/client/dialog/PreferencesDialog.java

@@ -32,6 +32,9 @@ import java.awt.image.BufferedImage;
 import java.io.File;
 import java.util.List;
 import java.util.*;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReadWriteLock;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
 import java.util.prefs.BackingStoreException;
 import java.util.prefs.Preferences;
 import java.util.stream.Collectors;
@@ -327,6 +330,7 @@ public class PreferencesDialog extends javax.swing.JDialog {
     // auto-update settings on first run
     public static final String KEY_SETTINGS_VERSION = "settingsVersion";
 
+    private static final ReadWriteLock cacheLock = new ReentrantReadWriteLock();
     private static final Map<String, String> CACHE = new HashMap<>();
 
     public static final String OPEN_CONNECTION_TAB = "Open-Connection-Tab";
@@ -3804,15 +3808,27 @@ public class PreferencesDialog extends javax.swing.JDialog {
     }
 
     public static String getCachedValue(String key, String def) {
-        if (CACHE.containsKey(key)) {
-            return CACHE.get(key);
-        } else {
+        final Lock r = cacheLock.readLock();
+        r.lock();
+        try {
+            if (CACHE.containsKey(key)) {
+                return CACHE.get(key);
+            }
+        } finally {
+            r.unlock();
+        }
+
+        final Lock w = cacheLock.writeLock();
+        w.lock();
+        try {
             String value = MageFrame.getPreferences().get(key, def);
             if (value == null) {
-                return def;
+                value = def;
             }
             CACHE.put(key, value);
             return value;
+        } finally {
+            w.unlock();
         }
     }
 

Mage.Server/src/main/java/mage/server/ChatSession.java

@@ -132,7 +132,7 @@ public class ChatSession {
                 }
             }
             if (!clientsToRemove.isEmpty()) {
-                final Lock w = lock.readLock();
+                final Lock w = lock.writeLock();
                 w.lock();
                 try {
                     users.keySet().removeAll(clientsToRemove);

Mage.Server/src/main/java/mage/server/util/ServerMessagesUtil.java

@@ -15,6 +15,7 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
 
@@ -53,13 +54,14 @@ public enum ServerMessagesUtil {
     }
 
     public List<String> getMessages() {
-        lock.readLock().lock();
+        final Lock r = lock.readLock();
+        r.lock();
         try {
             List<String> res = new ArrayList<>(this.newsMessages);
             res.add(this.statsMessage);
             return res;
         } finally {
-            lock.readLock().unlock();
+            r.unlock();
         }
     }
 
@@ -68,13 +70,14 @@ public enum ServerMessagesUtil {
         List<String> updatedMessages = new ArrayList<>(readFromFile());
         String updatedStats = getServerStatsMessage();
 
-        lock.writeLock().lock();
+        final Lock w = lock.writeLock();
+        w.lock();
         try {
             this.newsMessages.clear();
             this.newsMessages.addAll(updatedMessages);
             this.statsMessage = updatedStats;
         } finally {
-            lock.writeLock().unlock();
+            w.unlock();
         }
     }
 

Utils/find_new_cards.pl

@@ -185,13 +185,16 @@ if (exists ($new_order{$cmd}))
 	print ("\n\n\n");
 	my $set;
 	#print Dumper(\%cards_by_sets);
+	my $total = 0;
 	foreach $set (sort keys (%cards_by_sets))
     {
 		my $cards = $cards_by_sets{$set};
 		print ("* ", $set, " - added ", scalar @{$cards}, " new cards;", "\n");
 		foreach my $card (@{$cards})
 		{
+		    $total++;
 			print ("  * ", $card, "\n");
 		}
 	}
+	print ("* Total cards: ", $total);
 }