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Figure 2-9 Table per class hierarchy (accounts) Although many people write the table per class hierarchy technique off as simplistic and lacking scalability, it is one of the fastest approaches when it comes to inheritance structures and ORM The reasons are simple: you don t have to write a lot of complex joins or queries to get your data out of the database, and everything is stored in a single location, making polymorphism a snap Unfortunately, this approach also has significant drawbacks First, if you have more than a couple of types in your class model, this approach can become very complex very quickly because of the single-table structure and lack of foreign-key relationships Second, as your schema expands, your database has the potential to become nothing more than a glorified flat file and your table size can grow very large.

Figure 11-6. The Use Supertype Where Possible dialog box for java.util.ArrayList Obviously, this is a ridiculously simple example, but it demonstrates the core functionality. This method can also be used in conjunction with the Extract Superclass refactoring, described later in this chapter.

SNMP is a TCP protocol that allows the exchange of management information between hosts. I ll provide a simple explanation of SNMP and show you how to monitor devices and services using it. This will represent a basic introduction to using SNMP with Nagios, and you can take the use of SNMP monitoring in Nagios much further with some additional experimentation.

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Finally, did I mention that this approach has the possibility of creating a single data structure I m all for building robust object models and removing much of the onus from the database, but relational databases are meant to store relational data This means multiple tables with indexes, keys, Declarative Referential Integrity (DRI), and all those other functions that relational databases are specifically designed and tuned to handle The bottom line: this approach works great in simple applications and can be beneficial to enterprise applications that have tight control over their object model and database schema, yet it also has several drawbacks, so it is not ideal for every situation Table per Concrete Class The table per concrete class is probably the most common approach to handling inheritance with an ORM, mostly because it is the easiest to build into the ORM engine.

Caution This is a much abbreviated description of SNMP and how to use it with Nagios. I recommend

The Move Inner to Outer Level refactoring converts an inner class to a separate external class declared in its own file. Suppose you have the following code, in which the InnerClass class is declared inside the OuterClass class. public class OuterClass { public class InnerClass { public void execute() { System.out.println("execute..."); } } }

you read more widely on SNMP. Several excellent books are available on the topic, including one I particularly recommend, Essential SNMP (O Reilly, 2005).14

In this technique, you map each nonabstract class to its own table in the database In Figure 2-10, you can see that our accounts data model from Figure 2-9 has changed to include a distinct table per nonabstract class In this case, the abstract classes are not involved in the mapping, but their attributes are represented by the concrete classes This approach s biggest advantage is its simplicity and ease of implementation However, this technique has issues with regard to polymorphism and data redundancy Typically in the database, a foreign-key association is used to create a pseudo-polymorphic structure Unfortunately, if all classes are defined as their own entities with no foreign-key relationship to the base table, this mapping becomes difficult, if not impossible Another problem with the shortage of foreign-key associations in this approach is that data can become redundant quickly.

To move the InnerClass class to its own source file, highlight the class name and select Refactor Move Inner to Outer Level. In the Move Inner to Outer Level dialog box, you can specify a new name for the class that is being moved, as shown in Figure 11-7. This can be convenient, especially since inner classes are often named to make sense within the context of the containing outer class. Optionally, you can select to declare a field for the current outer class and enter a name for that field.

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