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use crate::node::*;
use std::collections::HashMap;
use anyhow::Result;
use thiserror::Error;
#[derive(Debug, Error)]
pub enum WorkerError {
#[error("Worker Not Found: `{0}`")]
WorkerNotFound(String),
#[error("Node[{0}]: {1}")]
NodeRunError(i64, anyhow::Error)
}
pub trait Worker {
fn name(&self) -> &str;
fn work(&self, node: &Node, input_data: InputData) -> Result<OutputData>;
}
pub struct Workers(HashMap<String, Box<dyn Worker>>);
impl Workers {
pub fn call(&self, name: &str, node: &Node, input: InputData) -> Result<OutputData> {
self.0.get(name)
.map(|worker|
worker.work(&node, input)
.map_err(|e|
anyhow!(WorkerError::NodeRunError(node.id, e))
)
)
.ok_or(WorkerError::WorkerNotFound(name.into()))?
}
}
pub struct WorkersBuilder {
data: Vec<(String, Box<dyn Worker>)>
}
#[allow(dead_code)]
impl WorkersBuilder {
pub fn new() -> WorkersBuilder {
WorkersBuilder { data: vec![] }
}
pub fn add<A>(&mut self, worker: A) -> &mut Self where A: Worker + 'static {
self.data.push((worker.name().to_string(), Box::new(worker)));
self
}
pub fn build(self) -> Workers {
Workers(self.data.into_iter().collect::<HashMap<_,_>>())
}
}