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115 office 1 <?php
2 /*
3 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
4 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
5 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
6 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
7 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
8 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
9 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
10 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
11 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
12 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
13 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
14 *
15 * This software consists of voluntary contributions made by many individuals
16 * and is licensed under the MIT license. For more information, see
17 * <http://www.doctrine-project.org>.
18 */
19  
20 namespace Doctrine\Common\Cache;
21  
22 use \Memcache;
23  
24 /**
25 * Memcache cache provider.
26 *
27 * @link www.doctrine-project.org
28 * @since 2.0
29 * @author Benjamin Eberlei <kontakt@beberlei.de>
30 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
31 * @author Jonathan Wage <jonwage@gmail.com>
32 * @author Roman Borschel <roman@code-factory.org>
33 * @author David Abdemoulaie <dave@hobodave.com>
34 */
35 class MemcacheCache extends CacheProvider
36 {
37 /**
38 * @var Memcache|null
39 */
40 private $memcache;
41  
42 /**
43 * Sets the memcache instance to use.
44 *
45 * @param Memcache $memcache
46 *
47 * @return void
48 */
49 public function setMemcache(Memcache $memcache)
50 {
51 $this->memcache = $memcache;
52 }
53  
54 /**
55 * Gets the memcache instance used by the cache.
56 *
57 * @return Memcache|null
58 */
59 public function getMemcache()
60 {
61 return $this->memcache;
62 }
63  
64 /**
65 * {@inheritdoc}
66 */
67 protected function doFetch($id)
68 {
69 return $this->memcache->get($id);
70 }
71  
72 /**
73 * {@inheritdoc}
74 */
75 protected function doContains($id)
76 {
77 $flags = null;
78 $this->memcache->get($id, $flags);
79  
80 //if memcache has changed the value of "flags", it means the value exists
81 return ($flags !== null);
82 }
83  
84 /**
85 * {@inheritdoc}
86 */
87 protected function doSave($id, $data, $lifeTime = 0)
88 {
89 if ($lifeTime > 30 * 24 * 3600) {
90 $lifeTime = time() + $lifeTime;
91 }
92 return $this->memcache->set($id, $data, 0, (int) $lifeTime);
93 }
94  
95 /**
96 * {@inheritdoc}
97 */
98 protected function doDelete($id)
99 {
100 // Memcache::delete() returns false if entry does not exist
101 return $this->memcache->delete($id) || ! $this->doContains($id);
102 }
103  
104 /**
105 * {@inheritdoc}
106 */
107 protected function doFlush()
108 {
109 return $this->memcache->flush();
110 }
111  
112 /**
113 * {@inheritdoc}
114 */
115 protected function doGetStats()
116 {
117 $stats = $this->memcache->getStats();
118 return array(
119 Cache::STATS_HITS => $stats['get_hits'],
120 Cache::STATS_MISSES => $stats['get_misses'],
121 Cache::STATS_UPTIME => $stats['uptime'],
122 Cache::STATS_MEMORY_USAGE => $stats['bytes'],
123 Cache::STATS_MEMORY_AVAILABLE => $stats['limit_maxbytes'],
124 );
125 }
126 }