PSR-14 Event System

Status

Superseded by ADR-026 (2024-02, superseded 2026)

Context

Consumers need extension points for:

• Logging and monitoring.

• Request modification.

• Response processing.

• Cost tracking and rate limiting.

Decision

Use TYPO3's PSR-14 event system with events:

• BeforeRequestEvent: Modify requests before sending.

• AfterResponseEvent: Process responses after receiving.

Events are dispatched by LlmServiceManager and provide:

• Full context (messages, options, provider).

• Mutable options (before request).

• Response data (after response).

• Timing information.

Consequences

Positive:

• ●● Follows TYPO3 conventions.

• ●● Decoupled extension mechanism.

• ● Multiple listeners without modification.

• ● Testable event handlers.

Negative:

• ◑ Event overhead on every request.

• ◑ Listener ordering considerations.

• ◑ Debugging event flow complexity.

Net Score: +6.5 (Strong positive impact - standard TYPO3 integration with decoupled extensibility)