File-sink-flush-failures

Read the number of flush failures recorded by a FileSink. This helper is useful for diagnosing durability-path problems on the direct file sink.

Interface

pub fn FileSink::flush_failures(self : FileSink) -> Int {

input

• self : FileSink - File sink whose flush-failure counter should be inspected.

output

• Int - Number of recorded flush failures.

Explanation

Detailed rules explaining key parameters and behaviors

• The sink reports its recorded flush-failure count directly.
• The counter is cumulative until reset.
• This helper is observation-only and does not mutate sink state.

How to Use

Here are some specific examples provided.

When Need Durability-path Diagnostics

When support output should show direct flush-path instability:

let count = sink.flush_failures()

In this example, the direct file sink exposes whether flush attempts have been failing.

When Inspect Effects Of Auto-flush Policy

When runtime durability tuning should be inspected operationally:

ignore(sink.flush_failures())

In this example, callers can correlate flush failures with direct file policy choices.

Error Case

e.g.:

• If callers need current policy and counters together, state() is the better API.

• This counter does not itself say whether the sink is open right now.

Notes

1. Use this helper when direct flush-path reliability matters.

2. Pair it with auto_flush_enabled() and flush() when diagnosing durability behavior.