There is an Apex class library used to support these patterns, which is also used in this book. The Apex Commons library is from an open source project started by FinancialForce.com and launched in the community at the Dreamforce 2012 event.

Since then, the patterns have been adopted by other developers on the platform and have been extended with additional features such as fieldsets and security. We will be using this library in the next three chapters as we explore the enterprise patterns they support in more detail. The GitHub repository can be found at https://github.com/financialforcedev/fflib-apex-common.