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Operations based on gcroot or auto_gcroot variables are slower than operations based on a tracking handle. For a detailed description of the overhead that is caused by each gcroot or auto_gcroot instance, as well as for each usage of operator->, read the following sidebar, entitled How Is gcroot Implemented To minimize the overhead caused by gcroot and auto_gcroot, there are two optimization strategies as follows: Avoid defining gcroot variables whenever possible. There are many situations in which a gcroot or an auto_gcroot variable can actually be avoided. For example, there is usually no need to define a global gcroot variable because you can define a static variable of a managed type instead. Another option may be to reduce the number of gcroot and auto_gcroot variables by combining several tracking handles into a managed collection or a custom managed type. Having one gcroot or auto_gcroot variable that refers to the managed collection or an instance of the custom managed type containing the tracking handles is cheaper than having many gcroot or auto_gcroot variables. Avoid access via operator-> if possible. operator-> is convenient but not necessarily efficient. Instead of accessing a managed object via operator-> several times, you can use gcroot s conversion operator or auto_gcroot s get function to obtain the wrapped handle once, and use this wrapped handle to access the managed object.

14.2.2 Resource usage Your EJB applications may be using JNDI lookup to find resources such as DataSources or JMS objects, and services such as EJBs or web services. Now that dependency injection is so readily available, you can use it instead of JNDI to find these resources. However, you have to remember the limitations of EJB 3 dependency injection. If you re using a DataSource, the differences between EJB 2 and EJB 3 are shown in table 14.3.

Table 14.3 The use of DataSource in EJB 2 was very complex and has been simplified in EJB 3 by using dependency injection. EJB 2 Define resource-ref in ejb-jar.xml Lookup resource Context ctx = new InitialContext(); DataSource ds = (DataSource) ctx.lookup("java:comp/env/ ActionBazaarDS"); Connection conn = ds.getConnection(); EJB 3 Can use dependency injection @Resource(name = "ActionBazaarDS") private DataSource ds; Connection conn = ds.getConnection();

Once the interface definitions are in place, the last remaining step is to implement them in the Web service code-behind. The first step is to derive the Web service class file from the interface definition; and the second step is to override the abstract methods, as shown in Listing 3-5. Listing 3-5. Deriving the Web Service .asmx Code-Behind Class from the Generated Interface Definition Class (StockTraderStub) // Step 1 (Before View): Implement the StockTraderStub class [WebService(Namespace = "http://www.bluestonepartners.com/schemas/StockTrader")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class StockTraderService : StockTraderStub { // Contains abstract methods (not shown) } // Step 2 (After View): Override and implement each of the abstract class methods [WebService(Namespace = "http://www.bluestonepartners.com/schemas/StockTrader")] public class StockTraderService : StockTraderStub { [WebMethod] [return: XmlElement(ElementName = "Quote", Namespace = "http://www.bluestonepartners.com/schemas/StockTrader/")] public override Quote RequestQuote(string Symbol) { // Implementation code goes here } } You need to set namespace names for both the Web service class and the interface definition classes. We usually include all classes within the same namespace, but there is no rule about this. If you do use different namespaces, then in the Web service class file you will need to import the namespace for the interface definition classes. At this point everything is in place to complete the implementation of the Web service methods. All operations and types are fully described and ready to be referenced from the Web service class file. Listing 3-6 shows an example implementation of the PlaceTrade Web method, which places a trade order and returns the trade details in a custom object type called Trade. Listing 3-6. The PlaceTrade Web Method [WebMethod] [SoapDocumentMethod(RequestNamespace= "http://www.bluestonepartners.com/schemas/StockTrader/", ResponseNamespace="http://www.bluestonepartners.com/schemas/StockTrader/", Use=SoapBindingUse.Literal, ParameterStyle=SoapParameterStyle.Bare)] [return: XmlElement("Trade", Namespace=

Table 14.4 The use of JMS objects in EJB 2 was also very complex and has been simplified in EJB 3 by using dependency injection. EJB 2.x Define resource-ref in ejb-jar.xml Lookup resource Context ctx = new InitialContext(); QueueConnectionFactory qcf = (QueueConnectionFactory) ctx.lookup("java:comp/env/jms/Queue ConnectionFactory"); QueueConnection conn = qcf.createQueueConnection(); EJB3 @Resource(name = "jms/QueueConnectionFactory") private QueueConnectionFactory qcf;