3 namespace Friendica\Core\Cache;
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6 use Friendica\Core\Cache;
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7 use Friendica\Database\DBM;
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8 use Friendica\Util\DateTimeFormat;
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11 * Database Cache Driver
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13 * @author Hypolite Petovan <mrpetovan@gmail.com>
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15 class DatabaseCacheDriver implements ICacheDriver
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17 public function get($key)
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19 $cache = dba::selectFirst('cache', ['v'], ['`k` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
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21 if (DBM::is_result($cache)) {
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22 $cached = $cache['v'];
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23 $value = @unserialize($cached);
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25 // Only return a value if the serialized value is valid.
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26 // We also check if the db entry is a serialized
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27 // boolean 'false' value (which we want to return).
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28 if ($cached === serialize(false) || $value !== false) {
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36 public function set($key, $value, $duration = Cache::MONTH)
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39 'v' => serialize($value),
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40 'expires' => DateTimeFormat::utc('now + ' . Cache::duration($duration) . ' seconds'),
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41 'updated' => DateTimeFormat::utcNow()
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44 return dba::update('cache', $fields, ['k' => $key], true);
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47 public function delete($key)
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49 return dba::delete('cache', ['k' => $key]);
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52 public function clear()
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54 return dba::delete('cache', ['`expires` < NOW()']);
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