Java

class WrapperClass (
    private static PoolClass pool = new PoolClass();
    private int calls;
    private ConnectionClass connection;

    public WrapperClass() {
        this.calls  = 0;
    }

    // every call to getConnection must be matched with a call to releaseConnection
    private ConnectionClass getConnection() {
        if (this.calls == 0) {
            this.connection =  WrapperClass.pool.getConnection(); 
        }
        this.calls++;
        return this.connection;
    }

    private void releaseConnection() {
        this.calls--;
        if (this.calls <= 0) {
            WrapperClass.pool.releaseConnection(this.connection);
            this.connection = null;
            this.calls  = 0;
        }
    }

    public void startMultipleUse() {
        this.getConnection();
    }
    public void useConnection() {
        ConnectionClass c = this.getConnection();

        // use c here and not the member variable

        this.releaseConnection();
    }
    public void endMultipleUse() {
        this.releaseConnection();
    }
)

c.thimmaiah wrote:

connection pool