Connection Pooling
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Connection pooling optimizes the time required to establish a connection with a database by creating a pool of reusable connections. It initially takes time to set up the connection pool but avoids repeatedly opening and closing connections, instead returning existing open connections from the pool. Most JDBC drivers and application servers support connection pooling through connection pool utilities like Apache Commons DBCP which is used to pool JDBC connections from a pool managed by the application server.
Connection Pooling
- 1. Connection Pooling Creating a Connection object is one of the most expensive operations ConnectionPooling optimizes the time required to establish a connection with a database. Use the Connection objects more efficiently by creating a pool of connections Request for a Connection ObjectPool of Connection ObjectsDatabase ClientconnectionServlet, JSP, etc Connection Object returned to the Pool Initially consumes time but never spend time for establishing new connections.Connection PoolingConnection PoolingInternal Clients ( e.g., Servlets) Lookup DataSource Lookup DataSourceConnectionPoolDatabaseExternal ClientsConnection Type 2,3,or 4 JDBC DriverDataSourceConnectionConnectionDataSourceConnectionJNDI Tree
- 2. Connection Pooling Using the interfaces in the javax.sql package Contextcontext = newInitialContext(); DataSourceds = (DataSource)context.lookup("jdbc/wingsDB"); Connection con = ds.getConnection(username, password); Connection object that will automatically participate in the connection poolingConnection Pooling Classic way to achieve connection poolingRequest for a ConnectionPool of Connection ObjectsConnectionReturned Still-Open ConnectionWhich doesn’t support Connection PoolingCustom ConnectionCustom ConnectionCustom ConnectionCustom DataSourceCustom ConnectionVendor’s DataSourceVendor’s ConnectionVendor’s ConnectionVendor’s ConnectionVendor’s Connection
- 3. Connection PoolingMost JDBC vendors already have connection pooling facilities
- 4. Connection pooling Utilities
- 5. Jakarta Commons DBCP
- 7. Part of Jakarta’s Commons
- 8. Designed to pool JDBC connections
- 9. JakartaCommons Pool
- 11. A general-purpose set of APIs used to pool any type of object
- 12. Under the Apache’s liberal license, it is available to learn and use
- 13. Connection pools are configured by the Java EE server administrator
- 14. Must be supported by the database driverDeveloped by Apache
- 15. Connection PoolingExplicitly close all connection objects
- 16. try, catch and finally blockConnection con = null;Context context= new InitialContext(); try { DataSource ds = (DataSource)context.lookup("jdbc/wingsDB"); con = ds.getConnection(username, password)// here we write our codes } catch (Exception e) { System.out.println(“Exception Caught”);} Note: Codes are continuing in the Next Slide
- 17. Connection Poolingfinally { if(con != null)con.close( ); }