<?php
// $Id: job_scheduler.install,v 1.4 2010/09/12 03:58:39 alexb Exp $

/**
 * @file
 * Schema definitions install/update/uninstall hooks.
 */

/**
 * Implementation of hook_schema().
 */
function job_scheduler_schema() {
  $schema = array();
  $schema['job_schedule'] = array(
    'description' => t('Schedule of jobs to be executed.'),
    'fields' => array(
      'callback' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Callback to be invoked.',
      ),
      'type' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Type identifier of the job.',
      ),
      'id' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'unsigned' => TRUE,
        'description' => 'Numeric identifier of the job.',
      ),
      'last' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'default' => 0,
        'not null' => TRUE,
        'description' => 'Timestamp when a job was last executed.',
      ),
      'period' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'default' => 0,
        'not null' => TRUE,
        'description' => 'Time period after which job is to be executed.',
      ),
      'next' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'default' => 0,
        'not null' => TRUE,
        'description' => 'Timestamp when a job is to be executed (next = last + period), used for fast ordering.',
      ),
      'periodic' => array(
        'type' => 'int',
        'size' => 'small',
        'unsigned' => TRUE,
        'default' => 0,
        'not null' => TRUE,
        'description' => 'If true job will be automatically rescheduled with same period.',
      ),
      'scheduled' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'default' => 0,
        'not null' => TRUE,
        'description' => 'Timestamp when a job was scheduled. 0 if a job is currently not scheduled.',
      ),
    ),
    'indexes' => array(
      'callback_type_id' => array('callback', 'type', 'id'),
      'callback_type' => array('callback', 'type'),
      'next' => array('next'),
      'scheduled' => array('scheduled'),
    ),
  );
  return $schema;
}

/**
 * Implementation of hook_install().
 */
function job_scheduler_install() {
  // Create tables.
  drupal_install_schema('job_scheduler');
}

/**
 * Implementation of hook_uninstall().
 */
function job_scheduler_uninstall() {
  // Remove tables.
  drupal_uninstall_schema('job_scheduler');
}

/**
 * Fix indexes on next.
 */
function job_scheduler_update_6101() {
  $ret = array();
  db_drop_index($ret, 'job_schedule', 'last_period');
  db_drop_index($ret, 'job_schedule', 'periodic');
  db_add_index($ret, 'job_schedule', 'next', array('next'));
  return $ret;
}