100 lines
3.6 KiB
PHP
100 lines
3.6 KiB
PHP
<?php
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/**
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* Table Definition for queue_item
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*/
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require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
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class Queue_item extends Managed_DataObject
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{
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###START_AUTOCODE
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/* the code below is auto generated do not remove the above tag */
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public $__table = 'queue_item'; // table name
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public $id; // int(4) primary_key not_null
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public $frame; // blob not_null
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public $transport; // varchar(32)
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public $created; // datetime() not_null
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public $claimed; // datetime()
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/* the code above is auto generated do not remove the tag below */
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###END_AUTOCODE
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public static function schemaDef()
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{
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return array(
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'fields' => array(
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'id' => array('type' => 'serial', 'not null' => true, 'description' => 'unique identifier'),
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'frame' => array('type' => 'blob', 'not null' => true, 'description' => 'data: object reference or opaque string'),
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'transport' => array('type' => 'varchar', 'length' => 32, 'not null' => true, 'description' => 'queue for what? "email", "xmpp", "sms", "irc", ...'),
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'created' => array('type' => 'datetime', 'not null' => true, 'description' => 'date this record was created'),
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'claimed' => array('type' => 'datetime', 'description' => 'date this item was claimed'),
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),
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'primary key' => array('id'),
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'indexes' => array(
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'queue_item_created_idx' => array('created'),
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),
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);
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}
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/**
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* @param mixed $transports name of a single queue or array of queues to pull from
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* If not specified, checks all queues in the system.
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*/
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static function top($transports=null, array $ignored_transports=array()) {
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$qi = new Queue_item();
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if ($transports) {
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if (is_array($transports)) {
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// @fixme use safer escaping
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$list = implode("','", array_map(array($qi, 'escape'), $transports));
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$qi->whereAdd("transport in ('$list')");
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} else {
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$qi->transport = $transports;
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}
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}
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if (!empty($ignored_transports)) {
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// @fixme use safer escaping
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$list = implode("','", array_map(array($qi, 'escape'), $ignored_transports));
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$qi->whereAdd("transport NOT IN ('$list')");
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}
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$qi->orderBy('created');
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$qi->whereAdd('claimed is null');
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$qi->limit(1);
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$cnt = $qi->find(true);
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if ($cnt) {
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// XXX: potential race condition
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// can we force it to only update if claimed is still null
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// (or old)?
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common_log(LOG_INFO, 'claiming queue item id = ' . $qi->getID() .
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' for transport ' . $qi->transport);
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$orig = clone($qi);
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$qi->claimed = common_sql_now();
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$result = $qi->update($orig);
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if ($result) {
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common_log(LOG_INFO, 'claim succeeded.');
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return $qi;
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} else {
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common_log(LOG_INFO, 'claim failed.');
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}
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}
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$qi = null;
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return null;
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}
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/**
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* Release a claimed item.
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*/
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function releaseClaim()
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{
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// DB_DataObject doesn't let us save nulls right now
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$sql = sprintf("UPDATE queue_item SET claimed=NULL WHERE id=%d", $this->getID());
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$this->query($sql);
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$this->claimed = null;
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$this->encache();
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}
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}
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