### Server load balancing

You can configure the pool with a list of servers instead of a single server.

    Pool pool = DB2Builder.pool()
      .with(options)
      .connectingTo(Arrays.asList(server1, server2, server3))
      .using(vertx)
      .build();

The pool uses a round-robin load balancing when a connection is created to select different servers.

Note | this provides load balancing when the connection is created and not when the connection is borrowed from the pool.

### Pool connection initialization

You can use the `withConnectHandler` to interact with a connection after it has been created and before it is inserted in a pool.

    builder.withConnectHandler(conn -> {
      conn.query(sql).execute().onSuccess(res -> {
        // Release the connection to the pool, ready to be used by the application
        conn.close();
      });
    });

Once you are done with the connection, you should simply close it to signal the pool to use it.

### Dynamic connection configuration

You can configure the pool connection details using a Java supplier instead of an instance of `SqlConnectOptions`.

Since the supplier is asynchronous, it can be used to provide dynamic pool configuration (e.g. password rotation).

    Pool pool = DB2Builder.pool()
      .with(poolOptions)
      .connectingTo(() -> {
        Future<SqlConnectOptions> connectOptions = retrieveOptions();
        return connectOptions;
      })
      .using(vertx)
      .build();