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1 | <?php |
2 | /* | |
3 | +--------------------------------------------------------------------+ | |
7e9e8871 | 4 | | CiviCRM version 4.7 | |
6a488035 | 5 | +--------------------------------------------------------------------+ |
fa938177 | 6 | | Copyright CiviCRM LLC (c) 2004-2016 | |
6a488035 TO |
7 | +--------------------------------------------------------------------+ |
8 | | This file is a part of CiviCRM. | | |
9 | | | | |
10 | | CiviCRM is free software; you can copy, modify, and distribute it | | |
11 | | under the terms of the GNU Affero General Public License | | |
12 | | Version 3, 19 November 2007 and the CiviCRM Licensing Exception. | | |
13 | | | | |
14 | | CiviCRM is distributed in the hope that it will be useful, but | | |
15 | | WITHOUT ANY WARRANTY; without even the implied warranty of | | |
16 | | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | | |
17 | | See the GNU Affero General Public License for more details. | | |
18 | | | | |
19 | | You should have received a copy of the GNU Affero General Public | | |
20 | | License and the CiviCRM Licensing Exception along | | |
21 | | with this program; if not, contact CiviCRM LLC | | |
22 | | at info[AT]civicrm[DOT]org. If you have questions about the | | |
23 | | GNU Affero General Public License or the licensing of CiviCRM, | | |
24 | | see the CiviCRM license FAQ at http://civicrm.org/licensing | | |
25 | +--------------------------------------------------------------------+ | |
d25dd0ee | 26 | */ |
6a488035 TO |
27 | |
28 | /** | |
29 | * The queue service provides an interface for creating or locating | |
30 | * queues. Note that this approach hides the details of data-storage: | |
31 | * different queue-providers may store the queue content in different | |
32 | * ways (in memory, in SQL, or in an external service). | |
33 | * | |
34 | * @code | |
35 | * $queue = CRM_Queue_Service::singleton()->create(array( | |
36 | * 'type' => 'interactive', | |
37 | * 'name' => 'upgrade-tasks', | |
38 | * )); | |
39 | * $queue->createItem($myData); | |
40 | * | |
41 | * // Some time later... | |
42 | * $item = $queue->claimItem(); | |
5e74f823 TO |
43 | * if ($item) { |
44 | * if (my_process($item->data)) { | |
16e38e82 | 45 | * $queue->deleteItem($item); |
5e74f823 | 46 | * } else { |
16e38e82 | 47 | * $queue->releaseItem($item); |
5e74f823 | 48 | * } |
6a488035 TO |
49 | * } |
50 | * @endcode | |
51 | */ | |
52 | class CRM_Queue_Service { | |
53 | ||
4523a2f5 | 54 | protected static $_singleton; |
6a488035 TO |
55 | |
56 | /** | |
57 | * FIXME: Singleton pattern should be removed when dependency-injection | |
58 | * becomes available. | |
59 | * | |
4523a2f5 TO |
60 | * @param bool $forceNew |
61 | * TRUE if a new instance must be created. | |
77b97be7 EM |
62 | * |
63 | * @return \CRM_Queue_Service | |
6a488035 | 64 | */ |
4523a2f5 | 65 | public static function &singleton($forceNew = FALSE) { |
6a488035 TO |
66 | if ($forceNew || !self::$_singleton) { |
67 | self::$_singleton = new CRM_Queue_Service(); | |
68 | } | |
69 | return self::$_singleton; | |
70 | } | |
71 | ||
72 | /** | |
4523a2f5 | 73 | * @var array (string $queueName => CRM_Queue_Queue) |
6a488035 | 74 | */ |
4523a2f5 | 75 | public $queues; |
e0ef6999 EM |
76 | |
77 | /** | |
e0ef6999 | 78 | */ |
4523a2f5 | 79 | public function __construct() { |
6a488035 TO |
80 | $this->queues = array(); |
81 | } | |
82 | ||
83 | /** | |
4523a2f5 TO |
84 | * Create a queue. If one already exists, then it will be reused. |
85 | * | |
86 | * @param array $queueSpec | |
87 | * Array with keys: | |
88 | * - type: string, required, e.g. "interactive", "immediate", "stomp", | |
89 | * "beanstalk" | |
6a488035 | 90 | * - name: string, required, e.g. "upgrade-tasks" |
4523a2f5 TO |
91 | * - reset: bool, optional; if a queue is found, then it should be |
92 | * flushed; default to TRUE | |
93 | * - (additional keys depending on the queue provider). | |
6a488035 TO |
94 | * |
95 | * @return CRM_Queue_Queue | |
96 | */ | |
4523a2f5 | 97 | public function create($queueSpec) { |
6a488035 TO |
98 | if (@is_object($this->queues[$queueSpec['name']]) && empty($queueSpec['reset'])) { |
99 | return $this->queues[$queueSpec['name']]; | |
100 | } | |
101 | ||
102 | $queue = $this->instantiateQueueObject($queueSpec); | |
103 | $exists = $queue->existsQueue(); | |
104 | if (!$exists) { | |
105 | $queue->createQueue(); | |
106 | } | |
107 | elseif (@$queueSpec['reset']) { | |
108 | $queue->deleteQueue(); | |
109 | $queue->createQueue(); | |
110 | } | |
111 | else { | |
112 | $queue->loadQueue(); | |
113 | } | |
114 | $this->queues[$queueSpec['name']] = $queue; | |
115 | return $queue; | |
116 | } | |
117 | ||
118 | /** | |
4523a2f5 TO |
119 | * Look up an existing queue. |
120 | * | |
121 | * @param array $queueSpec | |
122 | * Array with keys: | |
123 | * - type: string, required, e.g. "interactive", "immediate", "stomp", | |
124 | * "beanstalk" | |
6a488035 | 125 | * - name: string, required, e.g. "upgrade-tasks" |
4523a2f5 | 126 | * - (additional keys depending on the queue provider). |
6a488035 TO |
127 | * |
128 | * @return CRM_Queue_Queue | |
129 | */ | |
4523a2f5 | 130 | public function load($queueSpec) { |
6a488035 TO |
131 | if (is_object($this->queues[$queueSpec['name']])) { |
132 | return $this->queues[$queueSpec['name']]; | |
133 | } | |
134 | $queue = $this->instantiateQueueObject($queueSpec); | |
135 | $queue->loadQueue(); | |
136 | $this->queues[$queueSpec['name']] = $queue; | |
137 | return $queue; | |
138 | } | |
139 | ||
140 | /** | |
fe482240 | 141 | * Convert a queue "type" name to a class name. |
6a488035 | 142 | * |
4523a2f5 TO |
143 | * @param string $type |
144 | * E.g. "interactive", "immediate", "stomp", "beanstalk". | |
6a488035 | 145 | * |
4523a2f5 TO |
146 | * @return string |
147 | * Class-name | |
6a488035 TO |
148 | */ |
149 | protected function getQueueClass($type) { | |
150 | $type = preg_replace('/[^a-zA-Z0-9]/', '', $type); | |
151 | $className = 'CRM_Queue_Queue_' . $type; | |
152 | // FIXME: when used with class-autoloader, this may be unnecessary | |
153 | if (!class_exists($className)) { | |
154 | $classFile = 'CRM/Queue/Queue/' . $type . '.php'; | |
155 | require_once $classFile; | |
156 | } | |
157 | return $className; | |
158 | } | |
159 | ||
160 | /** | |
4523a2f5 TO |
161 | * @param array $queueSpec |
162 | * See create(). | |
6a488035 TO |
163 | * |
164 | * @return CRM_Queue_Queue | |
165 | */ | |
166 | protected function instantiateQueueObject($queueSpec) { | |
167 | // note: you should probably never do anything else here | |
168 | $class = new ReflectionClass($this->getQueueClass($queueSpec['type'])); | |
169 | return $class->newInstance($queueSpec); | |
170 | } | |
96025800 | 171 | |
6a488035 | 172 | } |