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However, as the number of your services grows, the ability to find existing services becomes increasingly difficult. Furthermore, mapping the interdependencies of each service also becomes exponentially more difficult. Making a change to your service landscape, at enterprise-level as complex a task as making a change in a point-to-point architecture. Fortunately, new tools are emerging to help you manage this ocean of data. Service registries operate like a phone book for services, allowing you to look up the locations of the services quickly and retrieve their runtime design information (Service Level Agreements and other metadata). Service repositories are great tools for tracking design-time metadata about services, such as their interdependencies. As your SOA grows, your need for professional service management tools will grow also. BEA is the only company, at the time of this writing, that provides a complete suite of SOA tools, including an enterprise-quality service registry and a service repository.

The previous example showed that attempting to divide by 0 causes an exception. You can modify the program to handle that exception by placing the code inside a try block and supplying a simple catch clause. When the exception is raised, it is caught and handled in the catch block. static void Main() { int x = 10; try { int y = 0; x /= y; } catch { ... // Code to handle the exception // Raises an exception

Odds are that your current enterprise architecture doesn t formally recognize service domains. If your company is like the vast majority of companies, then your current enterprise architecture will resemble that shown in Figure 10-14.

Console.WriteLine("Handling all exceptions - Keep on Running"); } } This code produces the following message. Notice that, other than the output message, there is no indication that an exception has occurred.

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</generator> </id> <property name="city" type="string" column="CITY" /> <property name="street" type="string" column="STREET" /> <property name="doorplate" type="string" column="DOOR_PLATE" /> <one-to-one name="customer" class="Customer5_2" propertyref="address"></one-to-one> </class> </hibernate-mapping> In JPA annotations, the Address property of the Customer class is mapped with the annotations OneToOne and JoinColumn. Also note that you enable the cascade feature, which saves the address associated with the customer: @Entity @Table (name="CUSTOMER",schema="BOOK5") public class Customer5_2 implements Serializable { private static final long serialVersionUID = -3534434932962734600L; @Column (name="ID") @Id @GeneratedValue (strategy=GenerationType.AUTO) private Long id; @Column (name="COUNTRY_CODE") private String countryCode; @Column (name="ID_CARD_NO") private String idCardNo; @Column (name="FIRST_NAME") private String firstName; @Column (name="LAST_NAME") private String lastName; @OneToOne (cascade=CascadeType.ALL) @JoinColumn (name="ADDRESS_ID") private Address5_2 address; @Column (name="EMAIL") private String email; // getters and setters } The Address class is as shown here. The customer is mapped with another one-to-one annotation, which makes it a bidirectional association. The inverse property reference is achieved with the mappedBy attribute:

Figure 10-14 Point-to-point integration This is commonly referred to as a point-to-point (P2P) integration strategy We ve also heard people refer to it as a rat s nest of integrations The illustration shows 28 circles Each circle represents an application in the enterprise The arrows show the dependencies between the applications Although the figure shows only a modest number of applications (most medium-sized enterprises have well over a hundred software applications running at any time), it represents sufficient complexity for our purposes The big question is, How do I transform my architecture from this rat s nest to use service domains and the SOA Coordinate System First, it s important to recognize that your enterprise didn t implement this rat s nest overnight It took years even decades to build that point-to-point architecture, and you won t correct it overnight.

There are many different types of exceptions that can occur in a program. The BCL defines a number of exception classes, each representing a specific type. When one occurs, the CLR Creates an exception object for the type Looks for an appropriate catch clause to handle it All exception classes are ultimately derived from the System.Exception class. A portion of the exception inheritance hierarchy is shown in Figure 11-2.

Figure 11-2. Structure of the exception hierarchy An exception object contains read-only properties with information about the exception that caused it. Some of these properties are shown in Table 11-1. Table 11-1. Selected Properties of an Exception Object

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