Initial implementation of IsolatedDatabaseHelperFactory

core/src/main/java/me/mastercapexd/auth/BaseAuthPlugin.java

@@ -155,7 +155,8 @@ private void initializeBasic() {
         this.authenticationStepContextFactoryBucket = new BaseAuthenticationStepContextFactoryBucket(config.getAuthenticationSteps());
         this.accountFactory = new AuthAccountFactory();
         this.linkTypeProvider = BaseLinkTypeProvider.allLinks();
-        this.accountDatabase = new AuthAccountDatabaseProxy(new DatabaseHelper(this));
+        // TODO: Replace this with IsolatedDatabaseHelperFactory
+        this.accountDatabase = new AuthAccountDatabaseProxy(new DatabaseHelper(this, null));
         this.loginManagement = new BaseLoginManagement(this);
 
         this.registerAuthenticationSteps();

core/src/main/java/me/mastercapexd/auth/database/DatabaseHelper.java

@@ -43,7 +43,7 @@ public class DatabaseHelper {
     private AuthAccountDao authAccountDao;
     private AccountLinkDao accountLinkDao;
 
-    public DatabaseHelper(AuthPlugin plugin) {
+    public DatabaseHelper(AuthPlugin plugin, ClassLoader classLoader) {
         DatabaseSettings databaseConfiguration = plugin.getConfig().getDatabaseConfiguration();
         SchemaSettings schemaSettings = databaseConfiguration.getSchemaSettings();
 
@@ -62,7 +62,7 @@ public DatabaseHelper(AuthPlugin plugin) {
                 String cacheDriverCheckSum = HashUtils.getFileCheckSum(cacheDriverFile, HashUtils.getMD5());
                 if (!cacheDriverFile.exists() || cacheDriverCheckSum != null && !DownloadUtil.checkSum(HashUtils.mapToMd5URL(downloadUrl), cacheDriverCheckSum))
                     DownloadUtil.downloadFile(downloadUrl, cacheDriverFile);
-                DriverUtil.loadDriver(cacheDriverFile, plugin.getClass().getClassLoader());
+                DriverUtil.loadDriver(cacheDriverFile, classLoader);
 
                 DataPersisterManager.registerDataPersisters(new CryptoProviderPersister());
 

core/src/main/java/me/mastercapexd/auth/database/IsolatedDatabaseHelperFactory.java

@@ -0,0 +1,40 @@
+package me.mastercapexd.auth.database;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import com.bivashy.auth.api.AuthPlugin;
+
+import me.mastercapexd.auth.util.InheritableClassLoader;
+
+public class IsolatedDatabaseHelperFactory {
+
+    private final ClassLoader parentClassLoader;
+    private final InheritableClassLoader classLoader;
+
+    public IsolatedDatabaseHelperFactory(ClassLoader parentClassLoader) {
+        this.parentClassLoader = parentClassLoader;
+        this.classLoader = new InheritableClassLoader(parentClassLoader);
+    }
+
+    // TODO: Replace DatabaseHelper with interface to avoid ClassCastException
+    public DatabaseHelper create(AuthPlugin authPlugin) {
+        try {
+            return tryToCreate(authPlugin);
+        } catch (IOException | ReflectiveOperationException e) {
+            e.printStackTrace(); // TODO: Replace with more robust logging
+            return null;
+        }
+    }
+
+    private DatabaseHelper tryToCreate(
+            AuthPlugin authPlugin) throws IOException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
+        String className = DatabaseHelper.class.getName();
+        String classPath = '/' + className.replace('.', '/') + ".class";
+        Class<?> databaseHelperClass = classLoader.defineClass(className, parentClassLoader.getResourceAsStream(classPath));
+        Constructor<?> databaseHelperConstructor = databaseHelperClass.getConstructor(AuthPlugin.class, ClassLoader.class);
+        return (DatabaseHelper) databaseHelperConstructor.newInstance(authPlugin, classLoader);
+    }
+
+}