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Apache::Session::Lock::MySQL.3pm

NAME

Apache::Session::Lock::MySQL - Provides mutual exclusion using MySQL

SYNOPSIS

  use Apache::Session::Lock::MySQL;
 
  my $locker = Apache::Session::Lock::MySQL->new();
 
  $locker->acquire_read_lock($ref);
  $locker->acquire_write_lock($ref);
  $locker->release_read_lock($ref);
  $locker->release_write_lock($ref);
  $locker->release_all_locks($ref);
 
 

DESCRIPTION

Apache::Session::Lock::MySQL fulfills the locking interface of Apache::Session. Mutual exclusion is achieved through the use of MySQL's GET_LOCK and RELEASE_LOCK functions. MySQL does not support the notion of read and write locks, so this module only supports exclusive locks. When you request a shared read lock, it is instead promoted to an exclusive write lock.

CONFIGURATION

The module must know how to connect to your MySQL database to acquire locks. You must provide a datasource name, a user name, and a password. These options are passed in the usual Apache::Session style, and are very similar to the options for Apache::Session::Store::MySQL. Example:

  tie %hash, 'Apache::Session::MySQL', $id, {
      LockDataSource => 'dbi:mysql:database',
      LockUserName   => 'database_user',
      LockPassword   => 'K00l'
  };
 
 

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

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

AUTHOR

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

SEE ALSO

Apache::Session