begin implementing sql connection pool (bruh)

pom.xml

@@ -76,6 +76,18 @@
             <artifactId>slf4j-api</artifactId>
             <version>2.0.13</version>
         </dependency>
+
+        <!-- DX -->
+        <dependency>
+            <groupId>org.checkerframework</groupId>
+            <artifactId>checker</artifactId>
+            <version>3.42.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.checkerframework</groupId>
+            <artifactId>checker-qual</artifactId>
+            <version>3.42.0</version>
+        </dependency>
     </dependencies>
 
     <build>

src/main/java/com/mykola2312/mptv/Main.java

@@ -1,6 +1,7 @@
 package com.mykola2312.mptv;
 
 import com.mykola2312.mptv.config.Config;
+import com.mykola2312.mptv.db.DB;
 import com.mykola2312.mptv.ui.MainFrame;
 import org.apache.commons.cli.*;
 import org.apache.log4j.Logger;

src/main/java/com/mykola2312/mptv/db/DB.java

@@ -1,4 +1,4 @@
-package com.mykola2312.mptv;
+package com.mykola2312.mptv.db;
 
 import java.sql.Connection;
 import java.sql.DriverManager;

src/main/java/com/mykola2312/mptv/db/DBPool.java

@@ -0,0 +1,42 @@
+package com.mykola2312.mptv.db;
+
+import org.checkerframework.checker.nullness.qual.*;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.LinkedList;
+
+import org.jooq.ConnectionProvider;
+import org.jooq.exception.DataAccessException;
+
+// I can't believe that in 2024 I have to do it myself
+public class DBPool implements ConnectionProvider {
+    private String url;
+    private String user;
+    private String password;
+
+    public static final int POOL_LIMIT = 4;
+    private LinkedList<Connection> connections;
+
+    public DBPool(String url, String user, String password) {
+        this.url = url;
+        this.user = user;
+        this.password = password;
+        
+        connections = new LinkedList<Connection>();
+    }
+
+    protected Connection spawnConnection() throws SQLException {
+        return null;
+    }
+
+    @Override
+    public @Nullable Connection acquire() throws DataAccessException {
+        throw new UnsupportedOperationException("Unimplemented method 'acquire'");
+    }
+
+    @Override
+    public void release(Connection arg0) throws DataAccessException {
+        throw new UnsupportedOperationException("Unimplemented method 'release'");
+    }
+    
+}