Runtime-sink-file-set-policy

Apply a bundled runtime file policy update to a RuntimeSink. This helper updates append mode, auto-flush, and rotation together through one runtime policy object on direct sink values.

Interface

pub fn RuntimeSink::file_set_policy(self : RuntimeSink, policy : FileSinkPolicy) -> Bool {

input

• self : RuntimeSink - Runtime sink whose file policy should change.
• policy : FileSinkPolicy - Bundled runtime file policy to apply.

output

• Bool - Whether the policy update was applied.

Explanation

Detailed rules explaining key parameters and behaviors

• Plain File runtime variants update append, auto-flush, and rotation together on the wrapped FileSink and return true.
• QueuedFile runtime variants forward the policy update to the wrapped inner FileSink and return true.
• Non-file runtime variants return false.
• This helper is broader than the single-setting setters because it updates the whole file policy in one call.

How to Use

Here are some specific examples provided.

When Need Bundled Runtime Policy Changes

When append, flush, and rotation should change together:

ignore(sink.file_set_policy(FileSinkPolicy::new(
  append=true,
  auto_flush=false,
  rotation=Some(file_rotation(2048, max_backups=2)),
)))

In this example, runtime file behavior is updated as one policy change.

When Apply A Policy Snapshot

When a previously captured or computed policy should be restored:

let ok = sink.file_set_policy(policy)

In this example, callers can reapply a whole policy object without splitting it into separate setter calls.

Error Case

e.g.:

• If the runtime sink is not file-backed, the method returns false.

• If callers only need to change one setting, a narrower setter such as file_set_auto_flush(...) or file_set_rotation(...) may be clearer.

Notes

1. Use this helper when the runtime policy should be treated as one cohesive object.

2. It pairs naturally with file_policy() and file_default_policy().