qubit-task 0.3.0

Task-oriented services built on top of qubit-executor and qubit-thread-pool
Documentation 
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/*******************************************************************************
 *
 *    Copyright (c) 2025 - 2026 Haixing Hu.
 *
 *    SPDX-License-Identifier: Apache-2.0
 *
 *    Licensed under the Apache License, Version 2.0.
 *
 ******************************************************************************/
use thiserror::Error;

use qubit_executor::service::SubmissionError;

use super::task_id::TaskId;

/// Error returned when [`TaskExecutionService`](super::TaskExecutionService)
/// cannot accept a task.
///
/// This error is about the service submission path. The accepted task's own
/// result is still reported through [`TaskHandle`](qubit_executor::TaskHandle).
///
#[derive(Debug, Error)]
pub enum TaskExecutionServiceError {
    /// Another retained task record already uses the same task ID.
    #[error("task {0} already exists")]
    DuplicateTask(TaskId),

    /// The service is suspended and temporarily refuses new tasks.
    #[error("task execution service is suspended")]
    Suspended,

    /// The underlying thread pool rejected the task.
    #[error(transparent)]
    Rejected(#[from] SubmissionError),
}