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So you ve started to define some hosts and services. It becomes an easy process, unless you have thousands of hosts and services. Then you start to notice that the definitions become very repetitive and contain many of the same directives with identical settings repeated over and over again. Thankfully, rather than having you continually cut and paste directives, Nagios offers a solution to this repetition. This solution is achieved using object templates. I m going to introduce configuration object templates and the concepts of object inheritance and recursion. A Nagios template is a generic definition for a particular type of object. For example, you might notice that most of the host object definitions for your routers share similar characteristics and therefore have many directives that are set identically for each host. Templates are a way to take advantage of these similarities to reduce your configuration time and effort. With templates, your object definitions inherit directive settings from a template object definition. Example 2-20 contains a template for a host object definition.

Development: Views can allow multiple developers to point their development code to a single database, yet make changes in specific tables. This can be useful in multiuser development environments, where each developer possesses his or her own database for development. To begin, the developer s database contains views of the tables in the central database. In the instance where a developer needs to alter a table for development, that developer can change the view, or drop the view and create a local copy of the table. After completing the code changes, the ALTER statements made to the local tables are made in the central database, and the developer replaces his or her local copies of the tables with views of the newly altered tables in the central database. Virtual fields: In a database design where storing calculated fields is not permitted, or in situations where new calculated fields need to be added, views can provide a virtual representation of those columns that are calculated as the query is executed. A view will solve a problem like having a basket table with a quantity and unit_cost field where you want to display the total_price (product of quantity and price_each) but don t want to store it in a table. A view can join the columns of a physical table with dynamically calculated columns to provide calculations without needing to store those calculations in the database.

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Note Using the ReaderWriterLock class, any number of threads can safely read data concurrently. Data is locked only when threads are updating. Reader threads can acquire a lock only if there are no writers holding the lock. Writer threads can acquire a lock only if there are no readers or writers holding the lock.

s Probably the most useful object types to use templates with are hosts, services, and contacts. Tip

MySQL s implementation of views conforms to the SQL:2003 standard, except in a few cases, which are noted as appropriate throughout the chapter. Views are associated with a specific database and are stored in a MySQL data dictionary file, located in /<datadir>/<database_name>/<view_name>.frm. Data dictionary files for views are stored in plain-text format, which means you can view the SQL that defines the view, as well as the other attributes of the view, with a text viewer or editor.

The following listing, ReadWriteLock.vb, shows the use of the ReaderWriterLock() lock: Imports System Imports System.Threading Namespace ReadWriteLock Public Class ReadWrite Private rwl As ReaderWriterLock Private x As Integer Private y As Integer

Example 2-20. Host Object Definition Template define host{ name check_command notification_options max_check_attempts register }

Note As we write this chapter, MySQL has released version 5.0.6, which is labeled a beta release. While

Public Sub New() rwl = New ReaderWriterLock() End Sub 'New Public Sub ReadInts(ByRef a As Integer, _ ByRef b As Integer) rwl.AcquireReaderLock(Timeout.Infinite) Try a = Me.x b = Me.y Finally rwl.ReleaseReaderLock() End Try End Sub 'ReadInts Public Sub WriteInts(ByVal a As Integer, _ ByVal b As Integer) rwl.AcquireWriterLock(Timeout.Infinite) Try Me.x = a Me.y = b Console.WriteLine( _ "x = {0} y = {1} ThreadID = {2}", _ Me.x, Me.y, AppDomain.GetCurrentThreadId) Finally rwl.ReleaseWriterLock() End Try End Sub End Class Public Class RWApp Private rw As New ReadWrite() Public Overloads Shared Sub Main( _ ByVal args() As [String]) Dim e As New RWApp() 'Writer Threads Dim wt1 As New Thread( _ New ThreadStart(AddressOf e.Write)) wt1.Start() Dim wt2 As New Thread( _ New ThreadStart(AddressOf e.Write)) wt2.Start()

A template for a host object definition, as shown in Example 2-20, closely resembles a normal host object definition but with two additional directives. The first directive, name, is the name of the template definition. The value of this directive is used to refer to the template in

the database is stable enough to test and document the functionality of views, production users are encouraged to wait until a release of the 5.0.x branch that is labeled for production.

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