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Figure 6-15. Creating a new persistence unit 4. Select a persistence provider. The Persistence Provider drop-down list shows various providers. The TopLink provider is selected by default, but you can select another listed provider or define a new provider. 5. Specify the data source that will be used. The Data Source drop-down list allows you to select a data source that you have previously defined in NetBeans to be used by the persistence unit. You can also create a new data source by selecting New Data Source from the Data Source drop-down list. The Create Data Source dialog box that appears prompts you to enter the name of the new data source and to select an existing database connection. (See 18 for details on adding database connections.) 6. If the Use Java Transaction APIs check box is selected, the data source needs to support the Java Transaction APIs.

The use_syslog directive controls whether Nagios will log to the syslog. A setting of 1 will enable syslog logging and a setting of 0 will disable it. By default, Nagios uses a syslog facility of user. On most systems, messages into this facility are placed in your default syslog file for example, on a Red Hat system this would be the /var/log/messages file. Unfortunately, this facility is hard-coded into the Nagios source code and cannot be changed. This can make separating out your Nagios syslog messages slightly more difficult. If you use a more advanced logging tool such as Syslog-NG,11 you can select only the Nagios syslog messages for processing. In Example 3-11 you can see an example of destination, filter, and log statements from the Syslog-NG tool, which would allow you to log your Nagios syslog messages to an individual file. These statements would be placed in your syslog-ng.conf configuration file. Example 3-11. Nagios syslog-ng Configuration destination d_nagios { file("/var/log/nagios"); }; filter f_nagios { facility("user") and program("nagios"); }; log { source(s_sys); filter(f_nagios); destination(d_nagios); }; In Example 3-11 all messages coming to the facility user from the program nagios would be placed in a destination file of /var/log/nagios. The next series of directives control what Nagios will log, both to your log file and, if enabled, to syslog. Table 3-3 shows the full list of available directives and their descriptions. Table 3-3. Directives for Selecting What Nagios Logs

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An entity is not a business object, regardless of the tendency to call it that According to Evans, an entity is an object that is defined by a thread of identity that runs through time and often across distinct representations Consider your automobile as a metaphor Your car has a vehicle identification number (VIN) that is used to uniquely identify it and track its existence However, you don t refer to your car as 3M8RDK9A9KP042788 (or if you do, you have a serious problem) No, you call it my car, or you may have a name for it such as Betsy or Old Blue or piece of junk How do you know it s your car, though Well, besides the fact that you make a monthly payment for it, you have given the car an identity.

7. The Table Generation Strategy selection specifies if tables associated with entity classes will be created, dropped and created, or not created at all. 8. Click the Finish button to create the persistence unit. The persistence.xml file is created under the Configuration Files node in the Projects window and opened in the persistence.xml Visual Editor.

log_notifications log_service_retries log_host_retries log_event_handlers log_passive_checks log_external_commands log_initial_states

Log notifications Log check retries of services Log check retries of hosts Log event handling Log passive checks Log external commands Log the initial state of hosts and services

This identity might be made up of attributes such as color, model, engine, and fuzzy dice, but the fact remains that you have still given this object identity and so it has become an entity..

The persistence.xml file that appears under the Configuration Files node contains the persistence configuration data you specified in the New File wizard when you created the persistence unit. The persistence.xml Visual Editor allows you to modify the fields in the persistence.xml file without having to manually edit XML content, as shown in Figure 6-16.

11. See www.balabit.com/products/syslog_ng/.

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