NAME
DBIx::BatchChunker::LoopState - Loop state object for DBIx::BatchChunker
VERSION
version v0.94.4
SYNOPSIS
sub chunk_method {
my ($bc, $rs) = @_;
my $loop_state = $bc->loop_state;
# introspect stuff
}DESCRIPTION
This is the loop state object used during BatchChunker runs. It only exists within the BatchChunker execution loop, and would generally only be accessible through the coderef or method referenced within that loop.
This is a quasi-private object and its API may be subject to change, but the module is in a pretty stable state at this point. While permissions are available to write to the attributes, it is highly recommended to not do so unless you know exactly what you doing. These are mostly available for introspection of loop progress.
ATTRIBUTES
batch_chunker
Reference back to the parent DBIx::BatchChunker object.
progress_bar
The progress bar being used in the loop. This may be different than "progress_bar" in DBIx::BatchChunker, since it could be auto-generated.
If you're trying to access the progress bar for debug or display purposes, it's best to use this attribute:
my $progress_bar = $bc->loop_state->progress_bar;
$progress_bar->message('Found something here');timer
Timer for debug messages. Always spans the time between debug messages.
start
The real start ID that the loop is currently on. May continue to exist within iterations if chunk resizing is trying to find a valid range. Otherwise, this value will become undef when a chunk is finally processed.
end
The real end ID that the loop is currently looking at. This is always redefined at the beginning of the loop.
prev_end
Last "processed" value of "end". This also includes skipped blocks. Used in "start" calculations and to determine if the end of the loop has been reached.
max_end
The maximum ending ID. This will be $DB_MAX_ID if "process_past_max" is set.
last_range
A hashref of min/max values used for the bisecting of one block, measured in chunk multipliers. Cleared out after a block has been processed or skipped.
last_timings
An arrayref of hashrefs, containing data for the previous 5 runs. This data is used for runtime targeting.
multiplier_range
The range (in units of "chunk_size") between the start and end IDs. This starts at 1 (at the beginning of the loop), but may expand or shrink depending on chunk count checks. Resets after block processing.
multiplier_step
Determines how fast "multiplier_range" increases, so that chunk resizing happens at an accelerated pace. Speeds or slows depending on what kind of limits the chunk count checks are hitting. Resets after block processing.
checked_count
A check counter to make sure the chunk resizing isn't taking too long. After ten checks, it will give up, assuming the block is safe to process.
chunk_size
The current chunk size, which might be adjusted by runtime targeting.
chunk_count
Records the results of the COUNT(*) query for chunk resizing.
prev_check
A short string recording what happened during the last chunk resizing check. Exists purely for debugging purposes.
prev_runtime
The number of seconds the previously processed chunk took to run, not including sleep time.
AUTHOR
Grant Street Group <developers@grantstreet.com>
COPYRIGHT AND LICENSE
This software is Copyright (c) 2018 - 2021 by Grant Street Group.
This is free software, licensed under:
The Artistic License 2.0 (GPL Compatible)