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Lucy::Index::Snapshot – Apache Lucy Documentation
Apache Lucy™

NAME

Lucy::Index::Snapshot - Point-in-time index file list.

SYNOPSIS

my $snapshot = Lucy::Index::Snapshot->new;
$snapshot->read_file( folder => $folder );    # load most recent snapshot
my $files = $snapshot->list;
print "$_\n" for @$files;

DESCRIPTION

A Snapshot is list of index files and folders. Because index files, once written, are never modified, a Snapshot defines a point-in-time view of the data in an index.

IndexReader objects interpret the data associated with a single Snapshot.

CONSTRUCTORS

new

my $snapshot = Lucy::Index::Snapshot->new;

Constructor. Takes no arguments.

METHODS

list

my $arrayref = $snapshot->list();

Return an array of all entries.

num_entries

my $int = $snapshot->num_entries();

Return the number of entries (including directories).

add_entry

$snapshot->add_entry($entry);

Add a filepath to the snapshot.

delete_entry

my $bool = $snapshot->delete_entry($entry);

Delete a filepath from the snapshot.

Returns: true if the entry existed and was successfully deleted, false otherwise.

read_file

my $result = $snapshot->read_file(
    folder => $folder  # required
    path   => $path    # default: undef
);

Decode a snapshot file and initialize the object to reflect its contents.

  • folder - A Folder.
  • path - The location of the snapshot file. If not supplied, the most recent snapshot file in the base directory will be chosen.

Returns: the Snapshot object itself

write_file

$snapshot->write_file(
    folder => $folder  # required
    path   => $path    # default: undef
);

Write a snapshot file. The caller must lock the index while this operation takes place, and the operation will fail if the snapshot file already exists.

  • folder - A Folder.
  • path - The path of the file to write. If undef, a file name will be chosen which supersedes the latest snapshot file in the index folder.

set_path

$snapshot->set_path($path);

Set the path to the file that the Snapshot object serves as a proxy for.

get_path

my $string = $snapshot->get_path();

Get the path to the snapshot file. Initially undef; updated by read_file(), write_file(), and set_path().

INHERITANCE

Lucy::Index::Snapshot isa Clownfish::Obj.