jesmith17 commented on code in PR #3467:
URL: https://github.com/apache/logging-log4j2/pull/3467#discussion_r1959741448


##########
log4j-mongodb4/src/main/java/org/apache/logging/log4j/mongodb4/MongoDb4Provider.java:
##########
@@ -60,14 +61,47 @@ public static class Builder<B extends Builder<B>> extends 
AbstractFilterable.Bui
         @PluginBuilderAttribute("capped")
         private boolean capped = false;
 
+        @PluginBuilderAttribute("collectionName")
+        private String collectionName;
+
+        @PluginBuilderAttribute("databaseName")
+        private String databaseName;
+
+
+
         @Override
         public MongoDb4Provider build() {
             StatusLogger.getLogger().warn("The {} Appender is deprecated, use 
the MongoDb Appender.", PLUGIN_NAME);
+
+            ConnectionString connectionString;
+            try {
+                connectionString = new 
ConnectionString(connectionStringSource);
+            } catch (final IllegalArgumentException e) {
+                LOGGER.error("Invalid MongoDB connection string `{}`.", 
connectionStringSource, e);
+                return null;
+            }
+
+            String effectiveDatabaseName = databaseName != null ? databaseName 
: connectionString.getDatabase();
+            String effectiveCollectionName = collectionName != null ? 
collectionName : connectionString.getCollection();
+            // Validate the provided databaseName property
+            try {
+                
MongoNamespace.checkDatabaseNameValidity(effectiveDatabaseName);
+            } catch (final IllegalArgumentException e) {
+                LOGGER.error("Invalid MongoDB database name `{}`.", 
effectiveDatabaseName, e);
+                return null;
+            }
+            // Validate the provided collectionName property
+            try {
+                
MongoNamespace.checkCollectionNameValidity(effectiveCollectionName);
+            } catch (final IllegalArgumentException e) {
+                LOGGER.error("Invalid MongoDB collection name `{}`.", 
effectiveCollectionName, e);
+                return null;
+            }

Review Comment:
   For people just trying to figure out how to add functionality its really 
hard when disputes about coding approach between maintainers are getting done 
inside the comments for a specific PR.   I would recommend that this becomes 
something you document better to make this easier for others. 



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