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@@ -72,12 +72,12 @@ class MemcacheLockingProvider extends AbstractLockingProvider { |
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public function acquireLock(string $path, int $type) { |
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if ($type === self::LOCK_SHARED) { |
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if (!$this->memcache->inc($path)) { |
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throw new LockedException($path); |
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throw new LockedException($path, null, $this->getExistingLockForException($path)); |
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} |
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} else { |
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$this->memcache->add($path, 0); |
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if (!$this->memcache->cas($path, 0, 'exclusive')) { |
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throw new LockedException($path); |
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throw new LockedException($path, null, $this->getExistingLockForException($path)); |
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} |
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} |
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$this->setTTL($path); |
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@@ -115,15 +115,26 @@ class MemcacheLockingProvider extends AbstractLockingProvider { |
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public function changeLock(string $path, int $targetType) { |
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if ($targetType === self::LOCK_SHARED) { |
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if (!$this->memcache->cas($path, 'exclusive', 1)) { |
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throw new LockedException($path); |
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throw new LockedException($path, null, $this->getExistingLockForException($path)); |
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} |
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} else if ($targetType === self::LOCK_EXCLUSIVE) { |
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// we can only change a shared lock to an exclusive if there's only a single owner of the shared lock |
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if (!$this->memcache->cas($path, 1, 'exclusive')) { |
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throw new LockedException($path); |
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throw new LockedException($path, null, $this->getExistingLockForException($path)); |
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} |
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} |
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$this->setTTL($path); |
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$this->markChange($path, $targetType); |
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} |
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private function getExistingLockForException($path) { |
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$existing = $this->memcache->get($path); |
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if (!$existing) { |
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return 'none'; |
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} else if ($existing === 'exclusive') { |
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return $existing; |
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} else { |
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return $existing . ' shared locks'; |
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} |
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} |
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} |