Module Fn 

Effect execution functions implemented on ApplicationRunTime.

Fn (RunTime::Execute)

RESPONSIBILITIES

Core effect execution functions that bridge the declarative ActionEffect system with the Echo scheduler for high-performance task execution.

ARCHITECTURAL ROLE

The execution engine in Mountain’s architecture that handles the “how” of effect execution, while ActionEffect defines the “what”.

KEY COMPONENTS

• Run: Basic effect execution through Echo scheduler
• RunWithTimeout: Timeout-based execution with cancellation
• RunWithRetry: Retry mechanisms with exponential backoff

ERROR HANDLING

All errors are propagated through Result<T, E> with detailed context. Effect errors are converted to CommonError when appropriate. Timeouts return timeout-specific errors. Retry failures include attempt count and last error information.

LOGGING

Uses log crate with appropriate severity levels:

• info: Effect submission and completion
• debug: Detailed execution steps
• warn: Retry attempts and recoverable errors
• error: Failed operations and timeout occurrences

PERFORMANCE CONSIDERATIONS

• Uses oneshot channels for result collection (minimal overhead)
• Tasks are submitted to Echo’s work-stealing scheduler
• Timeout uses tokio::time::timeout for efficient cancellation
• Retry with exponential backoff prevents system overload

TODO

None