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<?php |
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namespace Ackintosh\Snidel; |
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use Ackintosh\Snidel\Exception\SharedMemoryControlException; |
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class SharedMemory |
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{ |
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/** @var int **/ |
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private $pid; |
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/** @var int **/ |
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private $key; |
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/** @var int **/ |
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private $segmentId; |
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/** @const string **/ |
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const TMP_FILE_PREFIX = 'snidel_shm_'; |
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/** |
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* @param int $pid |
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*/ |
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public function __construct($pid) |
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{ |
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$this->pid = $pid; |
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$this->key = $this->generateKey($pid); |
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} |
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/** |
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* create or open shared memory block |
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* |
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* @param int $length |
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* @throws Ackintosh\Snidel\Exception\SharedMemoryControlException |
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*/ |
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public function open($length = 0) |
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{ |
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$flags = ($length === 0) ? 'a' : 'n'; |
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$mode = ($length === 0) ? 0 : 0666; |
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$this->segmentId = @shmop_open($this->key, $flags, $mode, $length); |
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if ($this->segmentId === false) { |
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throw new SharedMemoryControlException('could not open shared memory'); |
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} |
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} |
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/** |
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* write data into shared memory block |
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* |
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* @param string $data |
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* @throws Ackintosh\Snidel\Exception\SharedMemoryControlException |
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*/ |
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public function write($data) |
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{ |
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$writtenSize = @shmop_write($this->segmentId, $data, 0); |
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if ($writtenSize === false) { |
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throw new SharedMemoryControlException('could not write the data to shared memory'); |
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} |
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} |
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/** |
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* read data from shared memory block |
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* |
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* @return string |
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* @throws Ackintosh\Snidel\Exception\SharedMemoryControlException |
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*/ |
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public function read() |
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{ |
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$data = @shmop_read($this->segmentId, 0, shmop_size($this->segmentId)); |
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if ($data === false) { |
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throw new SharedMemoryControlException('could not read the data to shared memory'); |
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} |
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return $data; |
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} |
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/** |
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* delete shared memory block |
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* |
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* @throws Ackintosh\Snidel\Exception\SharedMemoryControlException |
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*/ |
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public function delete() |
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{ |
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if ($this->segmentId && !@shmop_delete($this->segmentId)) { |
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throw new SharedMemoryControlException('could not delete the data to shared memory'); |
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} |
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} |
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/** |
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* cloase shared memory block |
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* |
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* @param bool $removeTmpFile |
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*/ |
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public function close($removeTmpFile = false) |
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{ |
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if ($this->segmentId) { |
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shmop_close($this->segmentId); |
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} |
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if ($removeTmpFile) { |
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unlink('/tmp/' . self::TMP_FILE_PREFIX . sha1($this->pid)); |
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} |
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} |
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public function exists() |
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{ |
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$ret = @shmop_open($this->key, 'a', 0, 0); |
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return $ret !== false; |
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} |
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/** |
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* generate IPC key |
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* |
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* @return int |
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*/ |
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View Code Duplication |
private function generateKey($pid) |
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{ |
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$pathname = '/tmp/' . self::TMP_FILE_PREFIX . sha1($pid); |
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if (!file_exists($pathname)) { |
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touch($pathname); |
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} |
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return ftok($pathname, 'S'); |
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} |
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} |
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|
ackintosh /
snidel
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.