connectionpool.java

OA典型例子

package com.sure.dataabstraction;

import java.sql.Connection;

/**
 *  a JDBC Connection Pool interface. MWConnectionPool is default ConnectionPool
 *  implemention,DBManager create a MWConnectionPool as default ConnectionPool.
 *
 *@author     Mengzy
 *@date       2002-8-16
 */
public abstract class ConnectionPool {
    /**
     *  Description of the Field
     */
    protected DatabaseInfo databaseInfo;


    /**
     *@param  aDtabaseInfo  Description of the Parameter
     */
    public ConnectionPool(DatabaseInfo aDtabaseInfo) {
	databaseInfo = aDtabaseInfo;
    }


    /**
     *@return                      Connection
     *@exception  DBPoolException  return a ConnectionWrapper ,this Connection
     *      implementions override close method to avoid closing database
     *      connection acturely.
     *@roseuid                     3BEF24C00184
     */
    public abstract Connection getConnection() throws DBPoolException;


    /**
     */
    public abstract void destroy();


    /**
     *@param  connection
     */
    public abstract void freeConnection(Connection connection);


    /**
     *@return    int
     */
    public abstract int getSize();


    /**
     *@return    int
     */
    public abstract int getUsedCount();


    //return current available count
    /**
     *  Gets the availableCount attribute of the ConnectionPool object
     *
     *@return    The availableCount value
     */
    public abstract int getAvailableCount();


    /**
     *@param  connection
     *@return             int
     */
    public abstract int indexOfConnection(Connection connection);


    /**
     *@return    DatabaseInfo
     */
    public DatabaseInfo getDatabaseInfo() {
	return databaseInfo;
    }


    /**
     *@param  aDatabaseInfo
     */
    public void setDatabaseInfo(DatabaseInfo aDatabaseInfo) {
	if (aDatabaseInfo == null) {
	    return;
	}
	databaseInfo = aDatabaseInfo;
    }
}