Intel AS/400 RISC Server, 170 Servers, 7xx Servers manual

The Trade 6 application allows a user, typically using a Web browser, to perform the following actions:

yRegister to create a user profile, user ID/password and initial account balance

yLogin to validate an already registered user

yBrowse current stock price for a ticker symbol

yPurchase shares

ySell shares from holdings

yBrowse portfolio

yLogout to terminate the users active interval

Each action is comprised of many primitive operations running within the context of a single HTTP request/response. For any given action there is exactly one transaction comprised of 2-5 remote method calls. A Sell action for example, would involve the following primitive operations:

yBrowser issues an HTTP GET command on the TradeAppServlet

yTradeServlet accesses the cookie-based HTTP Session for that user

yHTML form data input is accessed to select the stock to sell

yThe stock is sold by invoking the sell() method on the Trade bean, a stateless Session EJB. To achieve the sell, a transaction is opened and the Trade bean then calls methods on Quote, Account and Holdings Entity EJBs to execute the sell as a single transaction.

yThe results of the transaction, including the new current balance, total sell price and other data, are formatted as HTML output using a Java Server Page, portfolio.jsp.

yMessage Driven Beans are used to inform the user that the transaction has completed on the next logon of that user.

To measure performance across various configuration options, the Trade 6 application can be run in several modes. A mode defines the environment and component used in a test and is configured by modifying settings through the Trade 6 interface. For example, data object access can be configured to use JDBC directly or to use EJBs under WebSphere by setting the Trade 6 runtime mode. In the Sell example above, operations are listed for the EJB runtime mode. If the mode is set to JDBC, the sell action is completed by direct data access through JDBC from the TradeAppServlet. Several testing modes are available and are varied for individual tests to analyze performance characteristics under various configurations.

IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008	Chapter 6 - Web Server and WebSphere	97