Connection Pool: Selected Code
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java Client
  |  
  +->ConnectionPool pool = ConnectionPool.getInstance(); // 1:
  |    | 
  |    +->return instance; // 1.1:
  |  
  +->Connection conn = pool.acquire("SuppDB"); // 2:
  |    |
  |    +->Connection conn = (Connection)v.elementAt(0); // 2.2a
  |
  +->pool.release("SuppDB",conn); // 6:
       | 
       +->Vector v = (Vector)hash.get(dbName); // 6.1:

ConnectionPool.getInstance()
  |
  +->private static ConnectionPool instance = new ConnectionPool();  // during class load
       |
       +->Class.forName(driverName); // 0:  // inside of constructor
       |
       +->makeConnections("genDB"); // 1:
            |
            +->Connection conn = DriverManager.getConnection(url+dbName); // 1.2a