Runtime-sink-file-open-failures

Read the number of open failures recorded by a file-backed RuntimeSink. This helper is useful for direct runtime diagnostics around file availability and reopen behavior.

Interface

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

input

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

output

• Int - Number of recorded open failures.

Explanation

Detailed rules explaining key parameters and behaviors

• Plain File runtime variants report the wrapped FileSink open-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 File Availability Diagnostics

When direct runtime support output should show whether file open or reopen failed:

let count = sink.file_open_failures()

In this example, the runtime sink exposes the open-failure metric directly.

When Validate Recovery Logic

When recovery code should inspect whether reopen attempts failed:

ignore(sink.file_open_failures())

In this example, the counter helps confirm whether file-open problems occurred during runtime.

Error Case

e.g.:

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

• If callers need the full file status snapshot rather than one counter, file_state() is the better API.

Notes

1. Use this helper for focused direct runtime file-open diagnostics.

2. Pair it with file_reopen(...) and file_available() during recovery analysis.