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<?php |
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namespace Basis; |
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use Exception; |
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use Predis\Client; |
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class Lock |
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{ |
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private $redis; |
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private $locks = []; |
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public function __construct(Client $redis) |
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{ |
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$this->redis = $redis; |
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register_shutdown_function([$this, 'releaseLocks']); |
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} |
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public function acquireOrQueue($name, $ttl = 1) |
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{ |
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if (!$this->lock($name, $ttl)) { |
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if (!$this->lock("queue-$name")) { |
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// somebody else waiting for next |
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return false; |
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} |
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$this->waitUnlock($name); |
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$this->unlock("queue-$name"); |
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if (!$this->lock($name, $ttl)) { |
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// somebody else take acquire locks |
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return false; |
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} |
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} |
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return true; |
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} |
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public function acquire($name, $ttl = 1) |
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{ |
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while (!$this->lock($name, $ttl)) { |
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$this->waitUnlock($name); |
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} |
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return true; |
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} |
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public function exists($name) |
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{ |
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return $this->redis->get("lock-$name") !== null; |
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} |
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public function lock($name, $ttl = 1) |
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{ |
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if (in_array($name, $this->locks)) { |
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throw new Exception("Lock $name was already registered"); |
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} |
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$result = $this->redis->set("lock-$name", 1, 'EX', $ttl, 'NX'); |
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if ($result) { |
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$this->locks[] = $name; |
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return true; |
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} |
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return false; |
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} |
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public function releaseLocks() |
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{ |
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foreach ($this->locks as $name) { |
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$this->unlock($name); |
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} |
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} |
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public function unlock($name) |
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{ |
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if (!in_array($name, $this->locks)) { |
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throw new Exception("Lock $name was already registered"); |
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} |
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foreach ($this->locks as $i => $candidate) { |
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if ($candidate == $name) { |
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unset($this->locks[$i]); |
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$this->redis->del("lock-$name"); |
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break; |
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} |
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} |
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$this->locks = array_values($this->locks); |
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} |
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public function waitUnlock($name) |
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{ |
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while ($this->exists($name)) { |
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// 100ms |
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usleep(100000); |
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} |
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return true; |
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} |
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} |
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basis-company /
framework.php
