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=head1 NAME

Lucy::Index::BackgroundMerger - Consolidate index segments in the background.


    my $bg_merger = Lucy::Index::BackgroundMerger->new(
        index  => '/path/to/index',


Adding documents to an index is usually fast, but every once in a while the
index must be compacted and an update takes substantially longer to
complete.  See L<Lucy::Docs::Cookbook::FastUpdates> for how to use
this class to control worst-case index update performance.

As with L<Indexer|Lucy::Index::Indexer>, see
L<Lucy::Docs::FileLocking> if your index is on a shared volume.


=head2 new( I<[labeled params]> )

    my $bg_merger = Lucy::Index::BackgroundMerger->new(
        index   => '/path/to/index',    # required
        manager => $manager             # default: created internally

Open a new BackgroundMerger.


=item *

B<index> - Either a string filepath or a Folder.

=item *

B<manager> - An IndexManager.  If not supplied, an IndexManager with
a 10-second write lock timeout will be created.


=head1 METHODS

=head2 commit()

Commit any changes made to the index.  Until this is called, none of
the changes made during an indexing session are permanent.

Calls prepare_commit() implicitly if it has not already been called.

=head2 prepare_commit()

Perform the expensive setup for commit() in advance, so that commit()
completes quickly.

Towards the end of prepare_commit(), the BackgroundMerger attempts to
re-acquire the write lock, which is then held until commit() finishes
and releases it.

=head2 optimize()

Optimize the index for search-time performance.  This may take a
while, as it can involve rewriting large amounts of data.


Lucy::Index::BackgroundMerger isa L<Lucy::Object::Obj>.