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Storage Abstraction Layer

BadWolf does not provide any storage. Instead, it provide a low level API for data persistence. This allows us to provide different storage implementations (also known sometimes as drivers), but still maintain the same data abstractions and data manipulation. This property allows you to use your favorite backend for data storage, or just implement a new one for your next project.

BadWolf release comes along only with a simple volatile, RAM-based implementation of the storage abstraction layer to illustrate how the API can be implemented.

The storage abstraction layer is built around two simple interfaces:

  • storage.Store interface: Allows to create new named graphs.
  • storage.Graph interface: Provides low level API to manipulate and lookup the data stored in the graph. It is important not to to confuse the data lookup capabilities with the BadWolf query language.

The goal of these interfaces is to allow writing specialized drivers for different storage back-ends. For instance, BadWolf provides a simple memory-based implementation of these interfaces in the storage/memory package. All relevant interface definitions can be found in the storage.go file of the storage package. Also storage/memory package provides a volatile memory-only implementation of both storage.Store and storage.Graph interfaces.