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Module Execute

Mountain::RunTime

Module Execute 

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Effect execution logic.

§Execute (RunTime)

§RESPONSIBILITIES

Effect execution logic that bridges the declarative ActionEffect system with the Echo scheduler for high-performance task execution.

Provides core execution methods through impl blocks on ApplicationRunTime:

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

§ARCHITECTURAL ROLE

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

§KEY COMPONENTS

  • Fn: Core effect execution functions implemented on ApplicationRunTime

§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

Medium Priority:

  • Add effect execution metrics (count, duration, success rate)
  • Implement effect execution tracing and profiling
  • Add effect prioritization levels beyond Normal
  • Implement effect cancellation token propagation
  • Add circuit breaker pattern for failing effects

Low Priority:

  • Implement distributed effect execution across instances
  • Add effect result caching for idempotent operations
  • Implement effect pipeline with chaining and composition
  • Add real-time effect monitoring dashboard
  • Implement adaptive timeout based on historical performance
  • Add effect execution limits (rate limiting)

Modules§

Fn
Effect execution functions implemented on ApplicationRunTime.