NAME

Lucy::Store::LockFactory - Create Locks.

SYNOPSIS

use Sys::Hostname qw( hostname );
my $hostname = hostname() or die "Can't get unique hostname";
my $folder = Lucy::Store::FSFolder->new( 
    path => '/path/to/index', 
);
my $lock_factory = Lucy::Store::LockFactory->new(
    folder => $folder,
    host   => $hostname,
);
my $write_lock = $lock_factory->make_lock(
    name     => 'write',
    timeout  => 5000,
    interval => 100,
);

DESCRIPTION

LockFactory is used to spin off interprocess mutex locks used by various index reading and writing components. The default implementation uses lockfiles, but LockFactory subclasses which are implemented using alternatives such as flock() are possible.

CONSTRUCTORS

new

my $lock_factory = Lucy::Store::LockFactory->new(
    folder => $folder,      # required
    host   => $hostname,    # required
);

Create a new LockFactory.

• folder - A Folder.

• host - An identifier which should be unique per-machine.

METHODS

make_lock

my $lock = $lock_factory->make_lock(
    name     => $name      # required
    timeout  => $timeout   # default: 0
    interval => $interval  # default: 100
);

Return a Lock object, which, once obtain() returns successfully, maintains an exclusive lock on a resource.

• name - A file-system-friendly id which identifies the resource to be locked.

• timeout - Time in milliseconds to keep retrying before abandoning the attempt to obtain() a lock.

• interval - Time in milliseconds between retries.

make_shared_lock

my $lock = $lock_factory->make_shared_lock(
    name     => $name      # required
    timeout  => $timeout   # default: 0
    interval => $interval  # default: 100
);

Return a Lock object for which shared() returns true, and which maintains a non-exclusive lock on a resource once obtain() returns success.

• name - A file-system-friendly id which identifies the resource to be locked.

• timeout - Time in milliseconds to keep retrying before abandoning the attempt to obtain() a lock.

• interval - Time in milliseconds between retries.

INHERITANCE

Lucy::Store::LockFactory isa Clownfish::Obj.