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Class examples.ejb.basic.statefulSession.TraderBean

examples.ejb.basic.statefulSession.TraderBean

public class TraderBean

• Automatic persistence of state between calls to the SessionBean
• The ability to look up values from the beans environment
• The use of Application-defined exceptions

TraderBean()

 

buy(String, String, int)

Buys shares of a stock for a named customer.

ejbActivate()

This method is required by the EJB Specification, but is not used by this example.

ejbCreate()

This method corresponds to the create method in the home interface "TraderHome.java".

ejbPassivate()

This method is required by the EJB Specification, but is not used by this example.

ejbRemove()

This method is required by the EJB Specification, but is not used by this example.

getBalance()

Returns the current balance of a trading session.

getStockPrice(String)

Returns the stock price for a given stock.

sell(String, String, int)

Sells shares of a stock for a named customer.

setSessionContext(SessionContext)

Sets the session context.

public TraderBean()

public void setSessionContext(javax.ejb.SessionContext ctx)

          Sets the session context.

Parameters:

ctx - SessionContext Context for session

public void ejbActivate()

          This method is required by the EJB Specification, but is not used by this example.

public void ejbPassivate()

          This method is required by the EJB Specification, but is not used by this example.

public void ejbRemove()

          This method is required by the EJB Specification, but is not used by this example.

public void ejbCreate() throws javax.ejb.CreateException

          This method corresponds to the create method in the home interface "TraderHome.java". The parameter sets of the two methods are identical. When the client calls TraderHome.create(), the container allocates an instance of the EJBean and calls ejbCreate().

Throws:

javax.ejb.CreateException - if there is a problem creating the bean

See Also:

Trader

public TradeResult buy(java.lang.String customerName,
                       java.lang.String stockSymbol,
                       int shares) throws ProcessingErrorException

          Buys shares of a stock for a named customer.

Parameters:

customerName - String Customer name

stockSymbol - String Stock symbol

shares - int Number of shares to buy

Returns:

TradeResult Trade Result

Throws:

ProcessingErrorException - if there is an error while buying the shares

public TradeResult sell(java.lang.String customerName,
                        java.lang.String stockSymbol,
                        int shares) throws ProcessingErrorException

          Sells shares of a stock for a named customer.

Parameters:

customerName - String Customer name

stockSymbol - String Stock symbol

shares - int Number of shares to buy

Returns:

TradeResult Trade Result

Throws:

ProcessingErrorException - if there is an error while selling the shares

public double getBalance()

          Returns the current balance of a trading session.

Returns:

double Balance

public double getStockPrice(java.lang.String stockSymbol) throws ProcessingErrorException

          Returns the stock price for a given stock.

Parameters:

stockSymbol - String Stock symbol

Returns:

double Stock price

Throws:

ProcessingErrorException - if there is an error while checking the price

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