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CHAPTER 4 JUMP INTO SPRING MVC
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this.legs = legs; this.totalCost = totalCost; } public BigDecimal getTotalCost() { return totalCost; } public boolean isNonStop() { return (legs.size() == 1); } public Airport getDepartFrom() { return getFirstLeg().getDepartFrom(); } private FlightLeg getFirstLeg() { return legs.get(0); } private FlightLeg getLastLeg() { return legs.get(legs.size()-1); } public Airport getArrivalAt() { return getLastLeg().getArriveAt(); } public int getNumberOfLegs() { return legs.size(); } /** * @return number of milliseconds for total travel time */ public long getTotalTravelTime() { Date start = getFirstLeg().getDepartOn(); Date end = getLastLeg().getArriveOn(); Assert.isTrue(end.compareTo(start) > 0, "Start date must be before end date"); return (end.getTime() - start.getTime()); } }
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CHAPTER 4 JUMP INTO SPRING MVC
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Listing 4-5. FlightLeg Class public class FlightLeg { private private private private Airport departFrom; Date departOn; Airport arriveAt; Date arriveOn;
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public FlightLeg(Airport departFrom, Date departOn, Airport arriveAt, Date arriveOn) { this.arriveAt = arriveAt; this.arriveOn = arriveOn; this.departFrom = departFrom; this.departOn = departOn; } public Airport getArriveAt() { return arriveAt; } public Date getArriveOn() { return arriveOn; } public Date getDepartOn() { return departOn; } public Airport getDepartFrom() { return departFrom; } }
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Once the domain model is flushed out, it is now time to define the service interface (see Listing 4-6). This interface provides easy access to the use cases through the fa ade pattern. These methods are coarse grained and stateless (i.e., multiple calls into the methods may happen concurrently without side effects). We say they are coarse grained to indicate that a single method call will accomplish the use case, instead of many small calls.
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Listing 4-6. FlightService Interface public interface FlightService { List<SpecialDeal> getSpecialDeals(); List<Flight> findFlights(SearchFlights search); } For the purposes of our example, we won t concern ourselves with how this interface is implemented. We want to show off Spring MVC, so in the meantime we will create a DummyFlightService implementation of FlightService that returns simple preset values. In the real world, you would most likely create a Data Access Object (DAO) layer for dealing with persistence. The service implementation would delegate to the DAOs, perform any extra processing necessary, and return the results. The Spring Framework contains many example projects that illustrate this architecture, and we recommend browsing through the source code. For a more in-depth discussion of the implementation of a Spring Framework application, consult the book Pro Spring by Rob Harrop and Jan Machacek (Apress, 2005).
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The FlightService implementation is defined inside this example s main applicationContext.xml. Normally, Dependency Injection would play a role in configuring your services, but for this simple example it is enough to simply define the bean. Later the web components of the application will be injected with this service, so it is important that the FlightService be accessible as a Spring bean. We are making a deliberate effort to separate our application beans from any web components by creating separate ApplicationContexts. This ensures an obvious separation between the different areas of the application. For instance, in Listing 4-7, we are defining the DummyFlightService bean in an ApplicationContext that is separate from any web components. Listing 4-7. applicationContext.xml < xml version="1.0" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <bean id="flightService" class="com.apress.expertspringmvc.flight.service.DummyFlightService" /> </beans>
CHAPTER 4 JUMP INTO SPRING MVC
Summary
Before any work was done on the web layer, we first analyzed the use cases to develop both a domain object model and a service layer. Focusing first on these layers forces us to design the core of the system without dependencies on the web layer. We also are forced into keeping all of the core business logic in the object model. The two use cases influenced the FlightService interface, supporting both a read-only method (getSpecialDeals()) and a query-and-response method (findFlights()). As the last step, the FlightService implementation is defined as a Spring bean inside the applicationContext.xml so that it may be easily injected into our web components.
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