pandrs 0.3.0

//! # Ballista Task Scheduling
//!
//! This module provides functionality for scheduling tasks in a Ballista cluster.

/// Scheduler for Ballista tasks
pub struct TaskScheduler {
    /// Cluster connection
    cluster: super::BallistaCluster,
}

impl TaskScheduler {
    /// Creates a new task scheduler
    pub fn new(cluster: super::BallistaCluster) -> Self {
        Self { cluster }
    }
    
    /// Schedules a task in the cluster
    #[cfg(feature = "distributed")]
    pub async fn schedule_task(
        &self,
        _plan: &crate::distributed::execution::ExecutionPlan,
    ) -> crate::error::Result<TaskHandle> {
        // Placeholder implementation
        // This will be implemented in the next phase
        Err(crate::error::Error::NotImplemented("Task scheduling will be implemented in the next phase".into()))
    }
    
    /// Gets the status of a task
    #[cfg(feature = "distributed")]
    pub async fn task_status(&self, _handle: &TaskHandle) -> crate::error::Result<TaskStatus> {
        // Placeholder implementation
        // This will be implemented in the next phase
        Err(crate::error::Error::NotImplemented("Task status tracking will be implemented in the next phase".into()))
    }
}

/// Handle for a scheduled task
#[derive(Debug, Clone)]
pub struct TaskHandle {
    /// Task ID
    id: String,
}

impl TaskHandle {
    /// Creates a new task handle
    pub fn new(id: String) -> Self {
        Self { id }
    }
    
    /// Gets the task ID
    pub fn id(&self) -> &str {
        &self.id
    }
}

/// Status of a task
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum TaskStatus {
    /// Task is queued for execution
    Queued,
    /// Task is running
    Running,
    /// Task completed successfully
    Completed,
    /// Task failed
    Failed(String),
    /// Task was cancelled
    Cancelled,
}