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As a result of the preceding bean declaration, you can see that the two customers get the same shopping cart instance. Shopping cart 1 contains [AAA 2.5, CD-RW 1.5] Shopping cart 2 contains [AAA 2.5, CD-RW 1.5, DVD-RW 3.0] This is because Spring s default bean scope is singleton, which means Spring creates exactly one shopping cart instance per IoC container. <bean id="shoppingCart" class="com.apress.springenterpriserecipes.shop.ShoppingCart" scope="singleton" /> In your shop application, you expect each customer to get a different shopping cart instance when the getBean() method is called. To ensure this behavior, you should change the scope of the shoppingCart bean to prototype. Then Spring will create a new bean instance for each getBean() method call and reference from the other bean. <bean id="shoppingCart" class="com.apress.springenterpriserecipes.shop.ShoppingCart" scope="prototype" /> Now if you run the Main class again, you can see that the two customers get a different shopping cart instance.

which they belong, are sufficient inputs to the quality assurance process. This is clearly not true. By themselves, they don t give a complete enough view. Despite this, metrics can still be valuable tools. Even if an application works properly, users will still complain if they find it to be too slow. It s therefore important to also monitor the application s average response time (its performance), and the number of concurrent users for which acceptable performance can be maintained (its scalability). Secondary metrics include ease of use, productivity gains, and business benefits. These metrics are of critical importance, but they re very difficult to measure while the software is being developed. You have to put working software into the hands of real users for extended periods of time in order to get meaningful data.

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Using JDK Timer Without Spring s Support After creating a timer task, you can schedule it by calling one of the overloaded schedule() methods of Timer. For example, the following timer runs the file replication task every 60 seconds with a 5-second delay for the first time of execution. package com.apress.springrecipes.replicator; import java.util.Timer; import java.util.TimerTask;

Shopping cart 1 contains [AAA 2.5, CD-RW 1.5] Shopping cart 2 contains [DVD-RW 3.0]

<beans ...> ... <bean id="sequenceGenerator" class="com.apress.springrecipes.sequence.SequenceGenerator"> <property name="initial" value="100000" /> <property name="suffix" value="A" /> </bean> <bean id="datePrefixGenerator" class="com.apress.springrecipes.sequence.DatePrefixGenerator"> <property name="pattern" value="yyyyMMdd" /> </bean> </beans> By default, all the properties with @Autowired are required. When Spring can t find a matching bean to wire, it will throw an exception. If you would like a certain property to be optional, set the required attribute of @Autowired to false. Then when Spring can t find a matching bean, it will leave this property unset. package com.apress.springrecipes.sequence; import org.springframework.beans.factory.annotation.Autowired; public class SequenceGenerator { ... @Autowired(required = false) public void setPrefixGenerator(PrefixGenerator prefixGenerator) { this.prefixGenerator = prefixGenerator; } } In addition to the setter method, the @Autowired annotation can also be applied to a constructor. Then Spring will attempt to find a bean with the compatible type for each of the constructor arguments. package com.apress.springrecipes.sequence; import org.springframework.beans.factory.annotation.Autowired; public class SequenceGenerator { ... @Autowired public SequenceGenerator(PrefixGenerator prefixGenerator) { this.prefixGenerator = prefixGenerator; } } The @Autowired annotation can also be applied to a field, even if it is not declared as public. In this way, you can omit the need of declaring a setter method or a constructor for

this field. Spring will inject the matched bean into this field via reflection. However, annotating a non-public field with @Autowired will reduce code testability since the code will be difficult to unit test. package com.apress.springrecipes.sequence; import org.springframework.beans.factory.annotation.Autowired; public class SequenceGenerator { @Autowired private PrefixGenerator prefixGenerator; ... } You may even apply the @Autowired annotation to a method with an arbitrary name and an arbitrary number of arguments. Then Spring will attempt to wire a bean with the compatible type for each of the method arguments. package com.apress.springrecipes.sequence; import org.springframework.beans.factory.annotation.Autowired; public class SequenceGenerator { ... @Autowired public void inject(PrefixGenerator prefixGenerator) { this.prefixGenerator = prefixGenerator; } }

Many real-world components have to perform certain types of initialization tasks before they are ready to be used. Such tasks include opening a file, opening a network/database connection, allocating memory, and so on. Also, they have to perform the corresponding destruction tasks at the end of their life cycle. So, you have a need to customize bean initialization and destruction in the Spring IoC container.

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