Module workflow 

The workflow engine: declared schema/workflows that run.

A workflow with config.executor: engine is an event-started process manager. The schema generator compiles its steps into a WorkflowSpec (data, with its conditions and templates as expr trees) beside a WorkflowDefinition that performs what only typed code can; the [WorkflowEngine] runs the spec over Postgres: a persisted instance and step log, durable waits, timers, retries, compensation, and a deadline.

• expr: the closed expression set, and the evaluator.
• spec: the compiled workflow and the definition trait.
• schema: the tables, as SQL.
• engine (feature postgres): the engine itself.

This module supersedes crate::flow, the in-memory instance and executor shell nothing used.

Re-exports

pub use expr::Dur;

pub use expr::Expr;

pub use expr::Funcs;

pub use expr::NoFuncs;

pub use expr::Scope;

pub use expr::Template;

pub use expr::Tpl;

pub use spec::Call;

pub use spec::StepKind;

pub use spec::StepSpec;

pub use spec::WorkflowDefinition;

pub use spec::WorkflowSpec;

Modules

expr

The closed expression set a workflow runs.

schema

The tables a workflow engine keeps, as SQL.

spec

What the schema generator writes for a workflow: its steps as data, and the one trait that performs what only typed code can.