Rust DCI Example

DCI (Data, Context, Interaction) is an object-oriented design paradigm that aims to improve readability and understandability of code.

Objects (Data) within a particular scenario (Context),
collaborate by playing specific roles (Interaction),
separating what the system is (the domain) from what the system does (use-cases and scenarios).

Maintaining the interaction's dynamic behavior and the data object's static properties separately,
DCI aims to clarify and simplify the system structure, making it more intuitive and human-friendly.

Data

Data represents the objects in your system or "what the system is".
These objects are static and don't change over time, they also contain relations.

Context

A context represents a scenario or use-case within which the data objects interact.
Each context corresponds to a system operation and is triggered by a specific event.
It also has code to mapping roles into objects at run time and to enact the use-case or scenario.

Interaction

Interaction is implemented as roles are stateless and are played by objects at run time.
These objects combine the state and methods of a data (domain).
It represents "what the system does".

This Example

Running

To see the log output of the program set RUST_LOG=info (enabling logging) in your machine environment.

Output

 INFO  dci_example_rust::roles > [  account:withdrawal] account #9999 1000000.000000 - 42000.000000 = 1042000.000000
 INFO  dci_example_rust::roles > [     account:deposit] account #7777 1000000.000000 + 42000.000000 = 958000.000000
 INFO  dci_example_rust::roles > [ bank:money_transfer] transferred 42000.000000 from account #7777 to account #9999
 INFO  dci_example_rust::roles > [  account:withdrawal] account #9999 1042000.000000 - 69000.000000 = 1111000.000000
 INFO  dci_example_rust::roles > [     account:deposit] account #8888 1000000.000000 + 69000.000000 = 931000.000000
 INFO  dci_example_rust::roles > [ bank:money_transfer] transferred 69000.000000 from account #8888 to account #9999
 INFO  dci_example_rust::roles > [  account:withdrawal] account #7777 958000.000000 - 96000.000000 = 1054000.000000
 INFO  dci_example_rust::roles > [     account:deposit] account #9999 1111000.000000 + 96000.000000 = 1015000.000000
 INFO  dci_example_rust::roles > [ bank:money_transfer] transferred 96000.000000 from account #9999 to account #7777