Runtime-sink-file-policy

Read the current runtime file policy from a RuntimeSink. This helper exposes the active append, auto-flush, and rotation settings as one policy object.

The returned FileSinkPolicy value is owned by src/file_model; this method is part of the runtime facade layer and reads or synthesizes policy through src/runtime over file-backed variants that ultimately use src/file_runtime.FileSink.

file_policy() is the compatibility form. For truthful file-semantics detection, prefer file_policy_or_none().

Interface

pub fn RuntimeSink::file_policy(self : RuntimeSink) -> FileSinkPolicy {

input

• self : RuntimeSink - Runtime sink whose current file policy should be inspected.

output

• FileSinkPolicy - Current runtime file policy.

Explanation

Detailed rules explaining key parameters and behaviors

• Plain File runtime variants return the current policy from the wrapped FileSink.
• QueuedFile runtime variants forward the policy from the wrapped inner FileSink.
• The returned policy object itself is the shared @file_model.FileSinkPolicy model, not a runtime-owned concrete type.
• Non-file runtime variants return the neutral fallback policy FileSinkPolicy::new(append=false, auto_flush=false, rotation=None).
• This fallback keeps older callers source-compatible, but it is not a real file policy.
• New diagnostic or recovery code should prefer file_policy_or_none().
• This helper is broader than file_append_mode() or file_auto_flush() because it returns the whole policy object.

How to Use

Here are some specific examples provided.

When Need Full Runtime Policy Visibility

When diagnostics should inspect the active file policy as one object:

let policy = sink.file_policy()

In this example, append, flush, and rotation settings are read together from the runtime sink.

When Compare Current And Default Policy

When runtime drift from defaults should be inspected explicitly:

let current = sink.file_policy()
let defaults = sink.file_default_policy()

In this example, callers can compare current runtime settings with the initial policy snapshot.

Error Case

e.g.:

• If the runtime sink is not file-backed, the return value is a neutral fallback policy rather than a real active file policy.

• If callers need a truthful file-semantics check, use file_policy_or_none().

• If callers only need one field from the policy, a narrower helper may be simpler.

Notes

1. Use this helper when file policy should be handled as one object.

2. Pair it with file_set_policy(...) for roundtrip-style policy management, or prefer file_policy_or_none() for truthful diagnostics.