NAME

Flux::File - file storage

VERSION

version 1.01

SYNOPSIS

    $storage = Flux::File->new($filename);
    $in = $storage->in(
        Flux::File::Cursor->new($posfile)
    );

DESCRIPTION

This is a simplest implementation of Flux::Storage.

It stores lines by appending them to the file. It supports clients identifiable by Flux::File::Cursor objects.

It also have several options for fine control over performance vs data consistency trade-off. (See the constructor documentation below.)

METHODS

new($file, [$options])

Create new object. $file should be a name of any writable file into which lines will be appended.

If $file does not yet exist, it will be created.

Options can contains the following keys:

lock (default = 1)

Get lock on each write (useful when many processes writes in one file).

reopen (default = 0)

Reopen file on each write (useful for files, which can be rotated).

safe (default = 0)

Truncate file to the last endline (useful when your unit for writings is a single lines and you don't want to have a hanging lines in your log in case of failure). If reopen is true, then file checks on each flush, otherwise it will be checked only at first flush.

write($line)

Write a new line into the file.

write_chunk($chunk)

Write multiple lines into the file.

in($posfile)

Construct the input stream which reads the file starting from the position saved in $posfile.

AUTHOR

Vyacheslav Matyukhin <me@berekuk.ru>

COPYRIGHT AND LICENSE

This software is copyright (c) 2013 by Yandex LLC.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.