/ 
Lucy-0.2.9_04
River stage two • 13 direct dependents • 20 total dependents
/ Lucy::Index::Indexer

NAME

Lucy::Index::Indexer - Build inverted indexes.

SYNOPSIS

my $indexer = Lucy::Index::Indexer->new(
    schema => $schema,
    index  => '/path/to/index',
    create => 1,
);
while ( my ( $title, $content ) = each %source_docs ) {
    $indexer->add_doc({
        title   => $title,
        content => $content,
    });
}
$indexer->commit;

DESCRIPTION

The Indexer class is Apache Lucy's primary tool for managing the content of inverted indexes, which may later be searched using IndexSearcher.

In general, only one Indexer at a time may write to an index safely. If a write lock cannot be secured, new() will throw an exception.

If an index is located on a shared volume, each writer application must identify itself by supplying an IndexManager with a unique host id to Indexer's constructor or index corruption will occur. See Lucy::Docs::FileLocking for a detailed discussion.

Note: at present, delete_by_term() and delete_by_query() only affect documents which had been previously committed to the index -- and not any documents added this indexing session but not yet committed. This may change in a future update.

CONSTRUCTORS

new( [labeled params] )

Open a new Indexer. If the index already exists, update it.

  • schema - A Schema.

  • index - Either a string filepath or a Folder.

  • manager - An IndexManager.

  • flags - Flags governing behavior.

METHODS

add_doc(...)

$indexer->add_doc($doc);
$indexer->add_doc( { field_name => $field_value } );
$indexer->add_doc(
    doc   => { field_name => $field_value },
    boost => 2.5,         # default: 1.0
);

Add a document to the index. Accepts either a single argument or labeled params.

  • doc - Either a Lucy::Document::Doc object, or a hashref (which will be attached to a Lucy::Document::Doc object internally).

  • boost - A floating point weight which affects how this document scores.

add_index(index)

Absorb an existing index into this one. The two indexes must have matching Schemas.

  • index - Either an index path name or a Folder.

optimize()

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

commit()

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

Calling commit() invalidates the Indexer, so if you want to make more changes you'll need a new one.

prepare_commit()

Perform the expensive setup for commit() in advance, so that commit() completes quickly. (If prepare_commit() is not called explicitly by the user, commit() will call it internally.)

delete_by_term( [labeled params] )

Mark documents which contain the supplied term as deleted, so that they will be excluded from search results and eventually removed altogether. The change is not apparent to search apps until after commit() succeeds.

  • field - The name of an indexed field. (If it is not spec'd as indexed, an error will occur.)

  • term - The term which identifies docs to be marked as deleted. If field is associated with an Analyzer, term will be processed automatically (so don't pre-process it yourself).

delete_by_query(query)

Mark documents which match the supplied Query as deleted.

INHERITANCE

Lucy::Index::Indexer isa Lucy::Object::Obj.