Crate libocc

This crate offers versioned CRUD operations for entities.

Any entity is modified using events. Every event is either of type create, update or delete.

You can use the Repository struct to use a nice abstraction for the underlying event logs, or use the Projector struct to access the lower-level operations of event projection.

use libocc::core;

fn test_repo() {
  // Create a new book
  let mut my_book = Book {
    uuid: String::from("some-uuid"),

    some_number: 1234,

    another_number: 234,

    author: Person {
      first_name: String::from(""),
      last_name: String::from(""),
    },

    hidden_property: String::from("sneaky af"),
  };

  // Create a new projector of type `Book`
  let mut books = core::Repository::<Book>::new(vec![]);

  println!("Empty repository:");
  println!("{:?}\n", books.get_projection());
  assert_eq!(books.get_projection().len(), 0);

  // Add a new book
  books.create(my_book.clone());

  println!("Repository after creating new book:");
  println!("{:?}\n", books.get_projection());
  assert_eq!(books.get_projection().get(0).unwrap().another_number, 234);

  let old_date = time::Instant::now();

  // Simulated delay
  thread::sleep(time::Duration::from_secs(1));

  // Modify the book
  my_book.another_number = 42;
  books.update(my_book.clone());

  println!("Repository after updating the book:");
  println!("{:?}\n", books.get_projection());
  assert_eq!(books.get_projection().get(0).unwrap().another_number, 42);

  println!("Repository before the book was updated:");
  println!("{:?}\n", books.project_at(&old_date));
  assert_eq!(
    books.project_at(&old_date).get(0).unwrap().another_number,
    234
  );
}

Modules

core	This is the core module, containing both the Repository and the Projector struct.
typings	This crate contains the CRUD enum, and the Event struct. They are used internally.