Important points
- These components only connect to data sources and do not implement the operations and methods to handle the data. Therefore, the classes that extend these persistences must implement this logic on their own.
- Identifiable Persistences work with Identifiable objects, which have primary keys. A few standard operations are defined by default for these objects: reading arrays and data pages; searching for an object by its id; and creating, updating and deleting records of objects.
Classes
FilePersistence
Abstract persistence component that stores data in flat files and caches them in memory.
This is the most basic persistence component that is only able to store data items of any type. Specific CRUD operations over the data items must be implemented in child classes by accessing the this._items property and calling the save method.
IdentifiableFilePersistence
Abstract persistence component that stores data in flat files and implements a number of CRUD operations over data items with unique ids. The data items must implement the [IIdentifiable interface]IIdentifiable
IdentifiableMemoryPersistence
Abstract persistence component that stores data in memory and implements a number of CRUD operations over data items with unique ids. The data items must implement the [IIdentifiable interface]IIdentifiable
JsonFilePersister
Persistence component that loads and saves data from/to a flat file. It is used by FilePersistence, but can be useful on its own.
MemoryPersistence
Abstract persistence component that stores data in memory.
This is the most basic persistence component that is only able to store data items of any type. Specific CRUD operations over the data items must be implemented in child classes by accessing the self._items property and calling the save method.