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A BidForItemCommand needs all input values for this action as constructor arguments. The client then looks up a command handler and passes the BidForItemCommand object for execution. The handler returns the instance after execution, and the client extracts any output values from the returned object. (If you work with JDK 5.0, use generics to avoid unsafe typecasts.) How the command handler is looked up or instantiated depends on the implementation of the command handler and how remote communication occurs. You don t even have to call a remote command handler it can be a local object. Let s look at the implementation of the command and the command handler. Implementing business commands The BidForItemCommand extends the abstract class DataAccessCommand and implements the execute() method:

Table 3.6 Mapper types. Mappers are used to flatten a directory tree during a <copy>, or check all files mapped into an archive against the archives modification date. Type identity flatten merge glob package Description The target is identical to the source file name. Source and target file names are identical, with the target file name having all leading directory path stripped. All source files are mapped to a single target file specified in the to attribute. A single asterisk (*) used in the from pattern is substituted into the to pattern. Only files matching the from pattern are considered. A subclass of the glob mapper, it functions similarly except replaces path separators with the dot character (.) so that a file with the hierarchical package directory structure can be mapped to a flattened directory structure retaining the package structure in the file name. Both the from and to patterns define regular expressions. Only files matching the from expression are considered.

public class BidForItemCommand extends DataAccessCommand implements Serializable { // Input private Long userId; private Long itemId; private BigDecimal bidAmount; // Output private Bid newBid; public BidForItemCommand(Long userId,

Long itemId, BigDecimal bidAmount) { this.userId = userId; this.itemId = itemId; this.bidAmount = bidAmount; } public Bid getNewBid() { return newBid; } public void execute() throws CommandException { ItemDAO itemDAO = daoFactory.getItemDAO(); UserDAO userDAO = daoFactory.getUserDAO(); try { Bid currentMaxBid = itemDAO.getMaxBid(itemId); Bid currentMinBid = itemDAO.getMinBid(itemId); Item item = itemDAO.findById(itemId, false); newBid = item.placeBid(userDAO.findById(userId, false), bidAmount, currentMaxBid, currentMinBid); } catch (BusinessException ex) { throw new CommandException(ex); } } }

Identity mapper The target file name maps exactly to the source file name. The to and from attributes are not used by the identity mapper.

This is basically the same code you wrote in the last stage of the web application refinement earlier in this chapter. However, with this approach, you have a clear contract for required input and returned output of an action. Because Command instances are sent across the wire, you need to implement Serializable (this marker should be in the concrete class, not the superclasses or interfaces). Let s implement the command handler. Implementing a command handler The command handler can be implemented in any way you like; its responsibilities are simple. Many systems need only a single command handler, such as the following:

By default, the <copy> task uses the identity mapper. The following two <copy> tasks have the same effect:

@Stateless public class CommandHandlerBean implements CommandHandler { // The persistence layer we want to call

<copy todir="new_web"> <fileset dir="web" includes="**/*.jsp"/> <mapper type="identity"/> </copy> <copy todir="new_web"> <fileset dir="web" includes="**/*.jsp"/> </copy>

DAOFactory daoFactory = DAOFactory.instance(DAOFactory.HIBERNATE); @TransactionAttribute(TransactionAttributeType.NEVER) public Command executeCommand(Command c) throws CommandException { c.execute(); return c; } @TransactionAttribute(TransactionAttributeType.REQUIRED) public Command executeCommand(DataAccessCommand c) throws CommandException { c.setDAOFactory(daoFactory); c.execute(); return c; } }

Flatten mapper The flatten mapper removes all directory path information from the source file name to map to the target file name. The to and from attributes are not used. The flatten mapper is useful in copying files from a nested directory structure into a single directory eliminating the hierarchy. To copy all JSP pages from the web directory hierarchy into a single flat directory, the flatten mapper is used in this manner: