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# frozen_string_literal: true
require 'fileutils'
module WithAdvisoryLock
class Flock < Base
def filename
@filename ||= begin
safe = lock_str.to_s.gsub(/[^a-z0-9]/i, '')
fn = ".lock-#{safe}-#{stable_hashcode(lock_str)}"
# Let the user specify a directory besides CWD.
ENV['FLOCK_DIR'] ? File.expand_path(fn, ENV['FLOCK_DIR']) : fn
end
end
def file_io
@file_io ||= begin
FileUtils.touch(filename)
File.open(filename, 'r+')
end
end
def try_lock
raise ArgumentError, 'transaction level locks are not supported on SQLite' if transaction
0 == file_io.flock((shared ? File::LOCK_SH : File::LOCK_EX) | File::LOCK_NB)
end
def release_lock
0 == file_io.flock(File::LOCK_UN)
end
end
end
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