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<bean id="anonymousAuthentication" class= "org.acegisecurity.providers.anonymous.AnonymousAuthenticationProvider" > <property name="key" value="timesheetAnonymous" /> </bean> The anonymous user is not essential we have the capacity to exclude URLs from our filters entirely, which has much the same effect but it is often simpler to write code that manipulates users than to write code that assumes the existence of a user but takes special actions when no user exists. For example, when logging access to a website, we may want to track user information. The use of an anonymous user allows us to write code that assumes a user even when none really exists, reducing the amount of conditional logic required. On the other hand, this adds some additional memory overhead to the request (and potentially to the session), which may offset these advantages if you are expecting very heavy user loads. One of the most useful providers available to us is the DaoAuthenticationProvider class. This allows us to implement a DAO class and use this to determine the user s permissions. Despite the name, this class does not need to be part of our DAO layer, architecturally speaking. In Listing 7-10, the implementation class is actually configured as a member of our service layer (and thus subject to the AOP-applied transactional constraints configured in 5).

Exercise 2-3

request. Therefore, when testing connectivity, make sure that you use a host that s allowed to answer.

The ping command is not just used to test that a connection can be established; you can also use it to check the roundtrip delay between your computer and a given host. The elapsed time is an important indication of the quality of the network connection. To check the roundtrip delay, have a look at the time parameter that s listed in the result of the ping command. Listing 8-12 provides an example in which ping is used to send four packets to www.ubuntu.com. Listing 8-12. Testing Connectivity to www.ubuntu.com root@ZNA:~# ping -c 4 www.ubuntu.com PING www.ubuntu.com (82.211.81.158) 56(84) bytes of 64 bytes from arctowski.ubuntu.com (82.211.81.158): 64 bytes from arctowski.ubuntu.com (82.211.81.158): 64 bytes from arctowski.ubuntu.com (82.211.81.158): 64 bytes from arctowski.ubuntu.com (82.211.81.158): data. icmp_seq=1 icmp_seq=2 icmp_seq=3 icmp_seq=4

<bean id="daoAuthentication" class="org.acegisecurity.providers.dao.DaoAuthenticationProvider"> <property name="passwordEncoder" ref="passwordEncoder" /> <property name="userDetailsService" ref="acegiUserDetailsService" /> </bean> <bean id="passwordEncoder" class="org.acegisecurity.providers.encoding.Md5PasswordEncoder"> <property name="encodeHashAsBase64" value="true" /> </bean> For a class to be used by the DaoAuthenticationProvider, it need only implement the interface shown in Listing 7-11. This will be passed the username for which a UserDetails object must be retrieved.

Use the AdventureWorks2008 database to complete this exercise. Follow the steps in this exercise to test your knowledge of pattern matching and wildcard queries. You can find the solutions in the appendix. 1. 2. 3. 4. 5. Write a query that displays the product ID and name for each product from the Production.Product table with a name starting with Chain. Write a query like the one in question 1 that displays the products with helmet in the name. Change the last query so that the products without helmet in the name are displayed. Write a query that displays the business entity ID number, first name, middle name, and last name from the Person.Person table for only those rows that have E or B stored in the middle name column. Explain the difference between the following two queries:

--- www.ubuntu.com ping statistics --4 packets transmitted, 4 received, 0% packet loss, time 3015ms rtt min/avg/max/mdev = 10.741/18.092/22.057/4.417 ms

SELECT FirstName FROM Person.Person WHERE LastName LIKE 'Ja%es'; SELECT FirstName FROM Person.Person WHERE LastName LIKE 'Ja_es';

public interface UserDetailsService { UserDetails loadUserByUsername(String username) throws UsernameNotFoundException, DataAccessException; } Listing 7-12 shows the interface that this UserDetails object must implement.

If you can ping your default router but you can t ping a given host on the Internet, it s probably obvious that something is wrong with one of the routers between your network and the destination host. You can use the traceroute command to find out exactly where things are going wrong. The traceroute command uses the TTL value of the UDP datagrams it sends out.