Crate snurr 

Snurr

Snurr can run the process flow from a Business Process Model and Notation (BPMN) 2.0 file created by https://demo.bpmn.io/new.

• Add your own behavior with Rust code from a small API. The wiring is already setup from the file.
• Easy to update the BPMN diagram with new Task and Gateways without the need to refactor your old code.
• The BPMN file is the actual design. Forget outdated documentation.
• Scaffold the initial BPMN diagram so you don’t have to do the boilerplate code.
• Contains no database.
• Single or multithreaded (opt in)

This is not a complete implementation of the BPMN 2.0 specification but intend to be a light weight subset of it.

Example

Cargo.toml

[dependencies]
snurr = "0.13"
log = "0.4"
pretty_env_logger = "0.5"

main.rs

use snurr::Process;

extern crate pretty_env_logger;

#[derive(Debug, Default)]
struct Counter {
    count: u32,
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    pretty_env_logger::init();

    // Create process from BPMN file
    let bpmn = Process::<Counter>::new("examples/example.bpmn")?
        .task("Count 1", |input| {
            input.lock().unwrap().count += 1;
            None
        })
        .exclusive("equal to 3", |input| {
            match input.lock().unwrap().count {
                3 => "YES",
                _ => "NO",
            }
            .into()
        })
        .build()?;

    // Run the process with input data
    let counter = bpmn.run(Counter::default())?;

    // Print the result.
    println!("Count: {}", counter.count);
    Ok(())
}

Structs

Build

Process Build state

IntermediateEvent

Event based gateway return type

Process

Process that contains information from the BPMN file

Run

Process Run state

Enums

Boundary

Task return type

Error

Snurr Errors

Symbol

BPMN Symbols

With

Inclusive gateway return type

Type Aliases

Data

Generic type for the task and gateway inputs.

Result

TaskResult

Task result type