File-sink-policy-new

Construct a FileSinkPolicy value from explicit append, auto-flush, and rotation settings. This is the low-level constructor behind the public file policy shape used by direct file sinks and higher-level runtime file-control APIs.

Interface

pub fn FileSinkPolicy::new(
  append~ : Bool = true,
  auto_flush~ : Bool = true,
  rotation~ : FileRotation? = None,
) -> FileSinkPolicy {

input

• append : Bool - Whether file open and reopen behavior should append instead of truncate.
• auto_flush : Bool - Whether each write should try to flush immediately.
• rotation : FileRotation? - Optional size-based rotation policy, or None to disable rotation.

output

• FileSinkPolicy - File policy object containing the supplied append, auto-flush, and rotation settings.

Explanation

Detailed rules explaining key parameters and behaviors

• Omitting optional arguments uses the baseline policy: append enabled, auto-flush enabled, and no rotation.
• This constructor simply packages the supplied settings into one public policy value.
• It does not inspect or mutate a live file sink by itself.
• The resulting value matches the same public shape accepted by FileSink::set_policy(...), RuntimeSink::file_set_policy(...), and ConfiguredLogger::file_set_policy(...).

How to Use

Here are some specific examples provided.

When Need A Hand-built File Policy

When append, flush, and rotation settings should be assembled as one typed value:

let policy = FileSinkPolicy::new(
  append=false,
  auto_flush=false,
  rotation=Some(file_rotation(2048, max_backups=2)),
)

In this example, the file policy is constructed directly without reading a live sink first.

When Need A Policy Value For Runtime Updates

When a direct or configured file sink should be updated with one cohesive policy object:

let policy = FileSinkPolicy::new(auto_flush=false)

In this example, callers create the policy once and can pass it into runtime file control APIs.

Error Case

e.g.:

• This constructor itself does not have a normal failure mode; it only packages the provided settings.

• If callers want the current live policy from a sink instead of constructing a new one, policy() or file_policy() is the simpler API.

Notes

1. Use this helper when code should construct a FileSinkPolicy value explicitly.

2. Pair it with file_sink_policy_to_json(...) or stringify_file_sink_policy(...) when the policy should be exported.