伪代码构建数据库连接池

伪代码构建数据库连接池可以简单地描述如下：

class ConnectionPool {
    private List<Connection> connections;
    private int maxConnections;
    private DataSource dataSource;

    // 构造函数
    public ConnectionPool(int maxSize, DataSource dataSource) {
        this.maxConnections = maxSize;
        this.dataSource = dataSource;
        connections = new ArrayList<>(maxSize);
    }

    // 获取连接
    public synchronized Connection getConnection() throws SQLException {
        if (connections.isEmpty()) {
            return dataSource.getConnection();
        } else {
            Connection connection = connections.get(0);
            connections.remove(connection); // 移除空闲连接
            connection.closeOnReturn(true); // 设置连接自动关闭
            return connection;
        }
    }

    // 归还连接
    public void releaseConnection(Connection connection) {
        try {
            connection.close(); // 如果连接异常，则关闭
            synchronized (this) {
                if (connections.size() < maxConnections) { // 当池不满时，添加回连接池
                    connections.add(connection);
                }
            }
        } catch (SQLException e) {
            log.error("Error releasing connection", e);
        }
    }
    
    // 其他辅助方法如初始化、清理等...
}