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As I stated earlier, Nagios can query variables on SNMP-enabled devices using the check_ snmp plug-in. This plug-in connects to the SNMP-enabled devices and queries a variable or variables you specify and then returns the data to the Nagios server in the form of a check result. Let s look at an example of the check_snmp command in action. In Example 5-14 I ve used the plug-in to return the status of a network interface on a device. Example 5-14. Using the check_snmp Plug-in puppy# check_snmp -H 10.0.0.4 -C public -o IF-MIB::ifOperStatus.1 SNMP OK - up(1) | RFC1213-MIB::ifOperStatus.1=up(1);;;; In Example 5-14 I ve specified the IP address I m connecting to using the -H option. I ve specified the read community string for the device at 10.0.0.4 of public. I ve also specified the particular OID I want to read using the -o option. In this case, the OID is IF-MIB::ifOperStatus.1 (which I could also specify as its numeric OID equivalent of .1.3.6.1.2.1.2.2.1.8.1, although it is considerably easier to use the abbreviated OID name). You can also specify multiple OIDs on a single -o option by separating each with a comma like so: puppy# check_snmp -H 10.0.0.4 -C public -o IF-MIB::ifOperStatus.1,IF-MIB::ifOperStatus.2 SNMP OK - up(1) up(1) | RFC1213-MIB::ifOperStatus.1=up(1);;;; RFC1213-MIB::ifOperStatus.2=up(1);;;; Both Example 5-14 and the command on the previous line returned data from the SNMPenabled device that was queried. First, because it was able to connect and retrieve the variable data, the plug-in returned an OK status code. It has also returned the status of the interface,

Figure 2-17. Lazy-load sequence diagram One thing to keep in mind when using laziness in your model is to determine ahead of time which fields are candidates for this loading technique. It can be extremely detrimental to performance if you go overboard with laziness because this functionality is fundamentally synchronous, meaning the consumer of your model will be waiting for a return response.

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Figure 11-9. The Pull Up dialog box Once the refactoring changes have been applied, the Truck and Vehicle classes look like this: public class Vehicle { public void start() { // start the vehicle }

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up(1), and in the second example the status of both interfaces. Additionally, the check_snmp plug-in returns performance data after the | symbol. The check_snmp plug-in has three modes of operation: 1) query variables, 2) query variables, and then compare the results to a string or regular expression, and 3) query a variable and measure against a threshold. The first mode I ve just demonstrated in Example 5-14. This mode simply returns information about the variable and an OK status if it connects. This is only marginally useful. The second mode of the plug-in allows you to trigger an alert on specific values using either the exact string returned or a regular expression. In Example 5-15 I ve again used the check_snmp plug-in to check the state of an interface. Example 5-15. Using check_snmp with an Evaluation String puppy# check_snmp -H owlet -o IF-MIB::ifOperStatus.1 -s "up(1)" SNMP OK - up(1) | RFC1213-MIB::ifOperStatus.1=up(1);;;; I ve added the -s option to the check_snmp plug-in the command line. The -s option lets you specify an exact string that you expect in the check result. If this string is not present, the check will return a CRITICAL status. In Example 5-15 I ve specified that if the check_snmp plug-in does not return the string up(1) for the required OID, indicating in this case that an interface being polled is up, then it should return a CRITICAL status.

The factory pattern was originally documented by the GoF in their famous book Design Patterns: Elements of Reusable Object-Oriented Software (Addison-Wesley Professional, 1994). The factory pattern is a creational pattern, and every developer should be familiar with it regardless of whether the context is ORM or another approach. At the heart of the factory pattern is encapsulation. As I mentioned in the Aggregates section earlier in this chapter, it is always a best practice to limit creation of objects in your domain. The factory pattern provides a standard technique for controlling the creation of objects and aggregates in your domain model. By using this technique in your domain model, you can decouple the creation of objects, thereby increasing flexibility and reusability. In addition, by using encapsulation, you can enforce any constraints in your aggregates and reduce the risk of corruption. As you may have realized, if at all possible I like to think of all patterns and object-oriented design in terms of real-world, nontechnical examples. The factory pattern is an easy one to think about in this manner. Similar to a factory producing potato chips, an object-oriented factory assembles all the pieces to create a final product for your consumption. Additionally,

public void stop() { // stop the vehicle } } public class Truck extends Vehicle { }

You will notice I ve enclosed within quotation marks the string to be compared against. This will Tip

ensure it is passed correctly to the device and not incorrectly interpreted by the shell or device.

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