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apache::session::lock::file(3) [suse man page]

Session::Lock::File(3)					User Contributed Perl Documentation				    Session::Lock::File(3)

NAME

       Apache::Session::Lock::File - Provides mutual exclusion using flock

SYNOPSIS

	use Apache::Session::Lock::File;

	my $locker = new Apache::Session::Lock::File;

	$locker->acquire_read_lock($ref);
	$locker->acquire_write_lock($ref);
	$locker->release_read_lock($ref);
	$locker->release_write_lock($ref);
	$locker->release_all_locks($ref);

	$locker->clean($dir, $age);

DESCRIPTION

       Apache::Session::Lock::File fulfills the locking interface of Apache::Session.  Mutual exclusion is achieved through the use of temporary
       files and the "flock" function.

CONFIGURATION

       The module must know where to create its temporary files.  You must pass an argument in the usual Apache::Session style.  The name of the
       argument is LockDirectory and its value is the path where you want the lockfiles created.  Example:

	tie %s, 'Apache::Session::Blah', $id, {LockDirectory => '/var/lock/sessions'}

       If you do not supply this argument, temporary files will be created in /tmp.

NOTES

   clean
       This module does not unlink temporary files, because it interferes with proper locking.	This can cause problems on certain systems (Linux)
       whose file systems (ext2) do not perform well with lots of files in one directory.  To prevent this you should use a script to clean out
       old files from your lock directory.  The meaning of old is left as a policy decision for the implementor, but a method is provided for
       implementing that policy.  You can use the "clean" method of this module to remove files unmodified in the last $age seconds.  Example:

	my $l = new Apache::Session::Lock::File;
	$l->clean('/var/lock/sessions', 3600) #remove files older than 1 hour

   acquire_read_lock
       Will do nothing if write lock is in effect, only set readlock flag to true.

   release_read_lock
       Will do nothing if write lock is in effect, only set readlock flag to false.

   Win32 and Cygwin
       Windows cannot escalate lock, so all locks will be exclusive.

       release_read_lock not supported - it is not used by Apache::Session.

       When deleting files, they are not locked (Win32 only).

AUTHOR

       This module was written by Jeffrey William Baker <jwbaker@acm.org>.

SEE ALSO

       Apache::Session

perl v5.12.1							    2007-09-28						    Session::Lock::File(3)

Check Out this Related Man Page

Apache::Session::Store::MySQL(3pm)			User Contributed Perl Documentation			Apache::Session::Store::MySQL(3pm)

NAME

       Apache::Session::Store::MySQL - Store persistent data in a MySQL database

SYNOPSIS

	use Apache::Session::Store::MySQL;

	my $store = new Apache::Session::Store::MySQL;

	$store->insert($ref);
	$store->update($ref);
	$store->materialize($ref);
	$store->remove($ref);

DESCRIPTION

       Apache::Session::Store::MySQL fulfills the storage interface of Apache::Session.  Session data is stored in a MySQL database.

SCHEMA

       To use this module, you will need at least these columns in a table called 'sessions', or another table name if you provide the TableName
       argument:

	id char(32)	# or however long your session IDs are.
	a_session text

       To create this schema, you can execute this command using the mysql program:

	CREATE TABLE sessions (
	   id char(32) not null primary key,
	   a_session text
	);

       If you use some other command, ensure that there is a unique index on the table's id column.

CONFIGURATION

       The module must know what datasource, username, and password to use when connecting to the database.  These values can be set using the
       options hash (see Apache::Session documentation).  The options are:

       DataSource
       UserName
       Password
       TableName
       Handle

       Example:

	tie %hash, 'Apache::Session::MySQL', $id, {
	    DataSource => 'dbi:mysql:database',
	    UserName   => 'database_user',
	    Password   => 'K00l',
	    TableName  => 'sessions'
	};

       Instead, you may pass in an already-opened DBI handle to your database.

	tie %hash, 'Apache::Session::MySQL', $id, {
	    Handle => $dbh
	};

AUTHOR

       This modules was written by Jeffrey William Baker <jwbaker@acm.org>

SEE ALSO

       Apache::Session

perl v5.10.1							    2010-10-18					Apache::Session::Store::MySQL(3pm)
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