Summary

In this chapter, we covered more ground to gain a good understanding on some of the design patterns. We created a logging library which can log information from multiple threads and handle different targets like file, database, and remote servers. We used strategy pattern to swap the various logger implementations based on a configuration file. Once again, the template method pattern helped us to create an extensible solution for accommodating new log targets. All we needed to do was to override the base implementation with the specifics of the new log targets, as log information processing is handled by the base implementation. We extended our factory method pattern to handle arbitrary objects based on configuration files. We also learned to leverage dictionary objects for generating singletons and prototypes. In the next chapter, we will write a data access layer which can help an application target multiple databases. In the process, you will learn about adapter pattern, factory...