February 2016
Beginner to intermediate
164 pages
3h 25m
English
book
Learning Python Design Patterns - Second Edition - Second Edition
by Chetan Giridhar, Gennadiy Zlobin
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A real-world scenario – the Singleton pattern, part 2
Let's consider another scenario where we implement health check services (such as Nagios) for our infrastructure. We create the HealthCheck class, which is implemented as a Singleton. We also maintain a list of servers against which the health check needs to run. If a server is removed from this list, the health check software should detect it and remove it from the servers configured to check.
In the following code, the hc1 and hc2 objects are the same as the class in Singleton.
Servers are added to the infrastructure for the health check with the addServer() method. First, the iteration of the health check runs against these servers. The changeServer() method removes the last server and adds ...
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