Java并发编程原理与实战二十四：简易数据库连接池

Posted 2021-01-02 屌丝码农

public class MyDataSource {

    private static LinkedList<Connection> pool = new LinkedList<>();

    private static final int INIT_CONNECTIONS = 10;

    private static final String DRIVER_NAME = "com.mysql.jdbc.Driver";

    private static final String URL = "";

    private static final String USER = "";

    private static final String PASSWORD = "";

    static {
        try {
            Class.forName(DRIVER_NAME);
            for (int i = 0; i < INIT_CONNECTIONS; i++) {
                Connection connection = DriverManager.getConnection(URL, USER, PASSWORD);
                pool.addLast(connection);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public Connection getConnection() {
        synchronized (pool) {
            while (pool.size() <= 0) {
                try {
                    wait();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

            if (!pool.isEmpty()) {
                return pool.removeFirst();
            }
        }
        return null;
    }

    public void releaseConnection(Connection connection) {
        if (connection != null) {
            synchronized (pool) {
                pool.addLast(connection);
                notifyAll();
            }
        }
    }
}

 

参考资料：

《java并发编程实战》龙果学院