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<?php |
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namespace itertools; |
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use ArrayIterator; |
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use Exception; |
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use IteratorIterator; |
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class LockingIterator extends IteratorIterator |
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{ |
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protected $lockFp; |
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protected $dir; |
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protected $lockNameMapper; |
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public function __construct($iterable, $dir, $lockNameMapper = null) |
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{ |
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parent::__construct(IterUtil::asTraversable($iterable)); |
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$this->dir = $dir; |
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$this->lockNameMapper = $lockNameMapper; |
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} |
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protected function lock($name) |
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{ |
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@mkdir($this->dir, 0777, true); |
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if (! is_dir($this->dir) || ! is_writable($this->dir)) { |
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throw new Exception("Could not create directory '{$this->dir}' to store lock files"); |
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} |
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$this->lockFp = fopen("{$this->dir}/$name", 'w+'); |
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if (false === $this->lockFp) { |
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throw new Exception("Error while trying to open lockfile '{$this->dir}/$name'"); |
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} |
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$flockStatus = flock($this->lockFp, LOCK_EX); |
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if (false === $flockStatus) { |
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throw new Exception("Error while trying to lock file '{$this->dir}/$name'"); |
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} |
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} |
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protected function unlock() |
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{ |
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flock($this->lockFp, LOCK_UN); |
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fclose($this->lockFp); |
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$this->lockFp = null; |
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} |
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public function current() |
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{ |
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$current = parent::current(); |
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if ($this->lockFp === null) { |
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$this->lock($this->getLockName($current)); |
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} |
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return $current; |
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} |
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protected function getLockName($current) |
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{ |
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if (null === $this->lockNameMapper) { |
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return $current; |
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} |
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return call_user_func($this->lockNameMapper, $current); |
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} |
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public function next() |
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{ |
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if ($this->lockFp !== null) { |
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$this->unlock(); |
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} |
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parent::next(); |
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} |
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} |
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SuRaMoN /
itertools
If you suppress an error, we recommend checking for the error condition explicitly: