Iteration 1: Developing Web Services Top-Down in Java

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Iteration 1: Developing Web Services Top-Down
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Figure 1022 Web Services Explorer getSchedule Operation
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Figure 1023 Message Form View getSchedule Response
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CHAPTER 10 Web Services
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4 View the SOAP message source (see Figure 1024) Click the Form link to return to the form display
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Figure 1024 Message Source View getSchedule SOAP Envelopes
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Summary of Iteration 1
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In this iteration you developed a Web service to retrieve League Planet schedules using the Top-Down approach You designed an XML schema for the schedule using the XSD editor You then used this schema in a Web service interface that you designed using the WSDL editor You deployed the WSDL file to the Apache Axis SOAP engine using the Web service wizard and verified that it was running using the AxisServlet servlet You then developed the implementation of the Web service using the League Planet business tier Finally, you tested it, without creating any code, using the Web Services Explorer You re now ready to design another Web service in iteration 2 using the Bottom-Up approach
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Iteration 2: Developing Web Services Bottom-Up
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The Bottom-Up approach to Web service development begins with creation of a Java service class The methods of the class define the operations of the Web service
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Iteration 2: Developing Web Services Bottom-Up
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The argument lists and return types define the messages of the operations After the service class is created, a tool is used to deploy it as a Web service and to generate the WSDL document that describes it If changes are made to the interface of the class, the deployment and WSDL generation steps must be repeated The Bottom-Up approach lets Java developers become immediately productive at Web service development No new XSD and WSDL design skills are required Bottom-Up development results in good Web service interfaces when the Java service class uses simple data transfer objects as the inputs and outputs of its operations However, if complex objects are used, then the resulting XSD may be hard to understand and less interoperable There is also the risk of bleed-through from the implementation into the service interface, which results in undesirable coupling between the client and service If the Web service interface changes whenever you change the implementation of the Java service class, then you will continually break your clients and largely defeat the benefits of Web services The best way to create a clean, stable, interoperable Web service interface is to design the XSD for the messages first, and use the Top-Down approach The next best way is to design a simple data transfer object layer for use in the Java service class interface, and use the Bottom-Up approach If you do use the Bottom-Up approach, be disciplined about not changing the method signatures of the Java service class Confine your changes to the method implementations to avoid breaking your clients In this iteration, you ll do the following: 1 Develop a Java service class to get details about a game and to update its score 2 Use the Web service wizard to deploy the service 3 Use the WSDL editor to view the generated WSDL
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Develop the Java Service Implementation
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1 The Java service implementation is in the comleagueplanet package Create this package now in the IceHockeyService project You will create Java classes in the following steps The complete source for these classes is available in the IceHockeyService/src/com/leagueplanet examples folder 2 The Update Web service has two operations: getGameDetail, which retrieves the details of a game, and updateScore, which updates the score of a game The getGameDetail operation takes as input the identifier of a game and returns as output the game detail You therefore need to develop a simple data transfer class to store the game detail Create the class
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CHAPTER 10 Web Services
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and try your hand at designing it Import GameDetailjava before proceeding (see Example 106)
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GameDetail
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Example 106 Listing of GameDetailjava
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package comleagueplanet; import javautilCalendar; /** * This class contains detail about games It is a simple JavaBean It is * suitable for populating a data entry form * * @author Arthur Ryman * */ public class GameDetail { private Calendar dateTime; private int visitorScore; public Calendar getDateTime() { return dateTime; } public void setDateTime(Calendar dateTime) { thisdateTime = dateTime; } public int getVisitorScore() { return visitorScore; } public void setVisitorScore(int visitorScore) { thisvisitorScore = visitorScore; } }
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3 A well-designed Web service should carefully validate its inputs and throw informative exceptions if the inputs are invalid Errors in inputs should be detected at the earliest possible opportunity to simplify the task of problem diagnosis The operations of the Update Web service take the game identifier and score as inputs Both the getGameDetail and updateScore operations take a game identifier as input A game identifier is valid if it is the identifier of a game that exists in the database Create the class GameException now and try to implement it Import GameExceptionjava before proceeding (see Example 107)
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