: A Batch Credit Card Processing System in Java

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Example: A Batch Credit Card Processing System
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Imagine we have a popular retail store with a series of 20 registers. Every minute, sales transactions take place that eventually must be processed with a third-party credit provider. Considering that we re only one store out of potentially millions using the provider, this adds up to a lot of traffic. If our business rules allow, we might be better served caching transactions in a pending state, and then processing a batch altogether
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in a single request. With the EJB Timer Service, we can schedule this job to fire within our EJBs. This full example is covered in detail in Appendix J.
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The Business Interface
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For the credit-card-processing subsystem, we only need to support a few features. First, we must be able to accept new transactions, which will be added to the pending queue. Next, we ll supply callers with a mechanism to schedule a batch-processing job. As a convenience, we ll also expose support to obtain the current pending transactions and a way to immediately process them. When a scheduled processing event is fired, it ll be able to simply call upon the business method to process.
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/** * Contract of a service capable of storing a series * of {@link CreditCardTransaction}s to be processed, * scheduling processing, and processing payment of * all pending transactions. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ public interface CreditCardTransactionProcessingLocalBusiness { //----------------------------------------------------------------------------|| // Contracts -----------------------------------------------------------------|| //----------------------------------------------------------------------------|| /** * Returns an immutable view of all transactions * pending processing * @return */ List<CreditCardTransaction> getPendingTransactions(); /** * Proceses all pending {@link CreditCardTransaction}s, * clearing them from the pending list when complete */ void process(); /** * Adds the specified {@link CreditCardTransaction} to be processed * @param transaction * @throws IllegalArgumentException If the transaction is null */ void add(CreditCardTransaction transaction) throws IllegalArgumentException; /** * Schedules a new {@link Timer} to process pending payments * according to the supplied {@link ScheduleExpression}. Returns
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}
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* the {@link Date} representing when the next job is to fire. * @param expression * @return * @throws IllegalArgumentException If the expression is null */ Date scheduleProcessing(ScheduleExpression expression) throws IllegalArgumentException;
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javax.ejb.ScheduleExpression and @javax.ejb.Schedule
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The scheduleProcessing method just shown accepts a type we haven t yet seen. New to EJB 3.1, javax.ejb.ScheduleExpression encapsulates an intuitive, flexible syntax for defining when timer events should fire. It s here that we can programmatically indicate scheduling by year, month, day of the month, day of the week, hour, minute, and second. Additionally, we can specify a wildcard character (*) to denote every , a list such as 0,2,6, or ranges such as 0-10. Section 18.2.1 of the EJB 3.1 Specification defines the format in full, but some examples are shown in Table 19-1.
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Table 19-1. Attributes of @javax.ejb.Schedule Attribute
second minute hour dayOfMonth month dayOfWeek year
Allowed values
[0,59] [0,59] [0,23] [1,31], or [-x], where x is the number of days from the end of the month, or "Last" [1,12] or {"Jan", "Feb", "Mar"..."Dec"} [0,7] or {"Sun","Mon","Tue"..."Sat"} (0 and 7 are both equal to "Sun")
Four-digit calendar year
The ScheduleExpression is used to programatically create a new javax.ejb.Timer via the javax.ejb.TimerService (we ll see both in a bit). Alternatively, it s possible to create new Timers in a declarative fashion via the @javax.ejb.Schedule annotation:
package javax.ejb; @Target(value=METHOD) @Retention(value=RUNTIME) public @interface Schedule { String dayOfMonth() default "*"; String dayOfWeek() default "*"; String hour() default "0"; String info() default ""; String minute() default "0";
String month() default "*"; boolean persistent() default true; String second() default "0"; String timezone() default ""; } String year() default "*";
The Timer Service enables an enterprise bean to be notified when a specific date has arrived, when some period of time has elapsed, or at recurring intervals. To use the Timer Service, an enterprise bean must implement the javax.ejb.TimedObject interface, which defines a single callback method, ejbTimeout():
package javax.ejb; public interface TimedObject { public void ejbTimeout(Timer timer) ; }
In EJB 3.x, the @javax.ejb.Timeout annotation can be applied to a method whose signature returns void and has either no parameters or one javax.ejb.Timer parameter. It s a matter of developer preference which technique is chosen to mark a method as a timeout; here we ll use the annotation. When the scheduled time is reached or the specified interval has elapsed, the container system invokes the enterprise bean s timeout callback method. The enterprise bean can then perform any processing it needs to respond to the timeout, such as run reports, audit records, modify the states of other beans, etc. In our case, we d like to delegate along to the logic that processes pending transactions.
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