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What happens when a developer gives a single estimate instead of a range The project manager will assume a level of variance in accordance with the left side of the table, but the true variance is actually that given on the right side of the table. Even if there is a contingency of 30 percent built into the project plan, the project may still be late and over budget when a slip of 50 to 100 percent occurs. The project can fail just because the contingency has been incorrectly calculated. Why is there such a difference between these two sets of figures We ve seen that software development is a process of ongoing research to refine the customer s needs and discover the tools capabilities (characteristic #8). Research is, by definition, an uncertain process: you don t know how long it will take to find out the unknowns until you ve actually done so.

Suppose you would like your file replicator application to notify the administrator of any error. First, you create the following ErrorNotifier interface, which includes a method for notifying of a file copy error: package com.apress.springrecipes.replicator; public interface ErrorNotifier {

public void notifyCopyError(String srcDir, String destDir, String filename); }

To enable declarative transaction management, you can declare a transaction advice via the <tx:advice> element defined in the tx schema, so you have to add this schema definition to the <beans> root element beforehand. Once you have declared this advice, you need to associate it with a pointcut. Because a transaction advice is declared outside the <aop:config> element, it cannot link with a pointcut directly. You have to declare an advisor in the <aop:config> element to associate an advice with a pointcut.

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s Note Invoking this notifier in case of error is left for you to accomplish. As you can consider error handling a crosscutting concern, AOP would be an ideal solution to this problem. You can write an after throwing advice to invoke this notifier.

Because Spring AOP uses the AspectJ pointcut expressions to define pointcuts, you have to include aspectjweaver.jar (located in the lib/aspectj directory of the Spring installation) in your classpath. If you're using Maven, then the dependency is as follows:

Next, you can implement this interface to send a notification in a way of your choice. The most common way is to send e-mail. Before you implement the interface in this way, you may need a local e-mail server that supports SMTP for testing purposes. I recommend installing Apache James Server (http://james.apache.org/server/index.html), which is very easy to install and configure.

<dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.6.2</version> </dependency>

The main thrust of project planning goes through the sequence of scope, time, and cost management activities that we have just considered. Alongside these activities, however, project managers also spend some time planning their quality management and risk management strategies. These subjects will be briefly covered in the next two sections.

s Note You can download Apache James Server (e.g., v2.3.1) from the Apache James web site and extract

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"> <tx:advice id="bookShopTxAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="purchase"/> </tx:attributes> </tx:advice> <aop:config> <aop:pointcut id="bookShopOperation"expression= "execution(* com.apress.springenterpriserecipes.bookshop.spring. BookShop.*(..))"/> <aop:advisor advice-ref="bookShopTxAdvice" pointcut-ref="bookShopOperation"/> </aop:config> ... <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource"ref="dataSource"/> </bean> <bean id="bookShop" class="com.apress.springenterpriserecipes.bookshop.spring.JdbcBookShop"> <property name="dataSource"ref="dataSource"/> </bean> </beans> The preceding AspectJ pointcut expression matches all the methods declared in the BookShop interface. However, because Spring AOP is based on proxies, it can apply only to public methods. Thus only public methods can be made transactional with Spring AOP. Each transaction advice requires an identifier and a reference to a transaction manager in the IoC container. If you don t specify a transaction manager explicitly, Spring will search the application context for a TransactionManager with a bean name of transactionManager. The methods that require transaction management are specified with multiple <tx:method> elements inside the <tx:attributes> element. The method name supports wildcards for you to match a group of methods. You can also define transaction attributes for each group of methods, but let s use the default attributes for simplicity s sake. The defaults are shown in Table 4-5.

it to a directory of your choice to complete the installation. To start it, just execute the run script (located in the bin directory).

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