Runtime-sink-file-flush-failures

Read the number of flush failures recorded by a file-backed RuntimeSink. This helper is useful for direct runtime diagnostics around durability-path problems.

Interface

pub fn RuntimeSink::file_flush_failures(self : RuntimeSink) -> Int {

input

• self : RuntimeSink - Runtime sink whose flush-failure counter should be inspected.

output

• Int - Number of recorded flush failures.

Explanation

Detailed rules explaining key parameters and behaviors

• Plain File runtime variants report the wrapped FileSink flush-failure count.
• QueuedFile runtime variants forward the metric from the wrapped inner FileSink.
• Non-file runtime variants return 0.
• The counter is cumulative until file_reset_failure_counters() clears it.

How to Use

Here are some specific examples provided.

When Need Durability-path Diagnostics

When support output should show flush-path instability:

let count = sink.file_flush_failures()

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

When Inspect Effects Of Auto-flush Policy

When runtime durability tuning should be inspected operationally:

ignore(sink.file_flush_failures())

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

Error Case

e.g.:

• If the runtime sink is not file-backed, the method returns 0.

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

Notes

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

2. Pair it with file_auto_flush() and file_flush() when diagnosing durability behavior.