92 lines
2.9 KiB
Rust
92 lines
2.9 KiB
Rust
use crate::queue::AsyncQueueable;
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use crate::task::DEFAULT_TASK_TYPE;
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use crate::worker::AsyncWorker;
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use crate::errors::FangError;
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use crate::{RetentionMode, SleepParams};
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use async_recursion::async_recursion;
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use log::error;
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use tokio::task::JoinHandle;
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use typed_builder::TypedBuilder;
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#[derive(TypedBuilder, Clone)]
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pub struct AsyncWorkerPool<AQueue>
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where
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AQueue: AsyncQueueable + Clone + Sync + 'static,
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{
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#[builder(setter(into))]
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/// the AsyncWorkerPool uses a queue to control the tasks that will be executed.
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pub queue: AQueue,
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/// sleep_params controls how much time a worker will sleep while waiting for tasks
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#[builder(default, setter(into))]
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pub sleep_params: SleepParams,
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/// retention_mode controls if tasks should be persisted after execution
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#[builder(default, setter(into))]
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pub retention_mode: RetentionMode,
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/// the number of workers of the AsyncWorkerPool.
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#[builder(setter(into))]
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pub number_of_workers: u32,
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/// The type of tasks that will be executed by `AsyncWorkerPool`.
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#[builder(default=DEFAULT_TASK_TYPE.to_string(), setter(into))]
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pub task_type: String,
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}
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impl<AQueue> AsyncWorkerPool<AQueue>
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where
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AQueue: AsyncQueueable + Clone + Sync + 'static,
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{
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/// Starts the configured number of workers
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/// This is necessary in order to execute tasks.
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pub async fn start(&mut self) {
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for idx in 0..self.number_of_workers {
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let pool = self.clone();
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tokio::spawn(Self::supervise_task(pool, 0, idx));
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}
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}
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#[async_recursion]
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async fn supervise_task(pool: AsyncWorkerPool<AQueue>, restarts: u64, worker_number: u32) {
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let restarts = restarts + 1;
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let join_handle = Self::spawn_worker(
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pool.queue.clone(),
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pool.sleep_params.clone(),
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pool.retention_mode.clone(),
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pool.task_type.clone(),
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)
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.await;
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if (join_handle.await).is_err() {
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error!(
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"Worker {} stopped. Restarting. the number of restarts {}",
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worker_number, restarts,
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);
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Self::supervise_task(pool, restarts, worker_number).await;
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}
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}
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async fn spawn_worker(
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queue: AQueue,
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sleep_params: SleepParams,
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retention_mode: RetentionMode,
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task_type: String,
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) -> JoinHandle<Result<(), FangError>> {
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tokio::spawn(async move {
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Self::run_worker(queue, sleep_params, retention_mode, task_type).await
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})
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}
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async fn run_worker(
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queue: AQueue,
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sleep_params: SleepParams,
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retention_mode: RetentionMode,
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task_type: String,
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) -> Result<(), FangError> {
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let mut worker: AsyncWorker<AQueue> = AsyncWorker::builder()
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.queue(queue)
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.sleep_params(sleep_params)
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.retention_mode(retention_mode)
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.task_type(task_type)
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.build();
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worker.run_tasks().await
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}
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}
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