PHP Zend_Search_Lucene::obtainWriteLock方法代码示例

 /**
  * Opens the index.
  *
  * IndexReader constructor needs Directory as a parameter. It should be
  * a string with a path to the index folder or a Directory object.
  *
  * @param mixed $directory
  * @throws Zend_Search_Lucene_Exception
  */
 public function __construct($directory = null, $create = false)
 {
     if ($directory === null) {
         throw new Zend_Search_Exception('No index directory specified');
     }
     if ($directory instanceof Zend_Search_Lucene_Storage_Directory_Filesystem) {
         $this->_directory = $directory;
         $this->_closeDirOnExit = false;
     } else {
         $this->_directory = new Zend_Search_Lucene_Storage_Directory_Filesystem($directory);
         $this->_closeDirOnExit = true;
     }
     $this->_segmentInfos = array();
     $this->_generation = self::getActualGeneration($this->_directory);
     if ($create) {
         try {
             $lock = Zend_Search_Lucene::obtainWriteLock($this->_directory);
         } catch (Zend_Search_Lucene_Exception $e) {
             if (strpos($e->getMessage(), 'Can\'t obtain exclusive index lock') === false) {
                 throw $e;
             } else {
                 throw new Zend_Search_Lucene_Exception('Can\'t create index. It\'s under processing now');
             }
         }
         if ($this->_generation == -1) {
             // Directory doesn't contain existing index, start from 1
             $this->_generation = 1;
             $nameCounter = 0;
         } else {
             // Directory contains existing index
             $segmentsFile = $this->_directory->getFileObject(self::getSegmentFileName($this->_generation));
             $segmentsFile->seek(12);
             // 12 = 4 (int, file format marker) + 8 (long, index version)
             $nameCounter = $segmentsFile->readInt();
             $this->_generation++;
         }
         Zend_Search_Lucene_Index_Writer::createIndex($this->_directory, $this->_generation, $nameCounter);
         Zend_Search_Lucene::releaseWriteLock($this->_directory, $lock);
     }
     if ($this->_generation == -1) {
         throw new Zend_Search_Lucene_Exception('Index doesn\'t exists in the specified directory.');
     } else {
         if ($this->_generation == 0) {
             $this->_readPre21SegmentsFile();
         } else {
             $this->_readSegmentsFile();
         }
     }
 }

 /**
  * Write changes if it's necessary.
  */
 public function writeChanges()
 {
     if (!$this->_deletedDirty) {
         return;
     }
     if (extension_loaded('bitset')) {
         $delBytes = $this->_deleted;
         $bitCount = count(bitset_to_array($delBytes));
     } else {
         $byteCount = floor($this->_docCount / 8) + 1;
         $delBytes = str_repeat(chr(0), $byteCount);
         for ($count = 0; $count < $byteCount; $count++) {
             $byte = 0;
             for ($bit = 0; $bit < 8; $bit++) {
                 if (isset($this->_deleted[$count * 8 + $bit])) {
                     $byte |= 1 << $bit;
                 }
             }
             $delBytes[$count] = chr($byte);
         }
         $bitCount = count($this->_deleted);
     }
     // Get new generation number
     $lock = Zend_Search_Lucene::obtainWriteLock($this->_directory);
     $delFileList = array();
     foreach ($this->_directory->fileList() as $file) {
         if ($file == $this->_name . '.del') {
             // Matches <segment_name>.del file name
             $delFileList[] = 0;
         } else {
             if (preg_match('/^' . $this->_name . '_([a-zA-Z0-9]+)\\.del$/i', $file, $matches)) {
                 // Matches <segment_name>_NNN.del file names
                 $delFileList[] = (int) $matches[1];
             }
         }
     }
     if (count($delFileList) == 0) {
         // There is no deletions file for current segment in the directory
         // Set detetions file generation number to 1
         $this->_delGen = 1;
     } else {
         // There are some deletions files for current segment in the directory
         // Set detetions file generation number to the highest + 1
         $this->_delGen = max($delFileList) + 1;
     }
     $delFile = $this->_directory->createFile($this->_name . '_' . base_convert($this->_delGen, 10, 36) . '.del');
     Zend_Search_Lucene::releaseWriteLock($this->_directory, $lock);
     $delFile->writeInt($this->_docCount);
     $delFile->writeInt($bitCount);
     $delFile->writeBytes($delBytes);
     $this->_deletedDirty = false;
 }

 /**
  * Get name for new segment
  *
  * @return string
  */
 private function _newSegmentName()
 {
     $lock = Zend_Search_Lucene::obtainWriteLock($this->_directory);
     $generation = Zend_Search_Lucene::getActualGeneration($this->_directory);
     $segmentsFile = $this->_directory->getFileObject(Zend_Search_Lucene::getSegmentFileName($generation), false);
     $segmentsFile->seek(12);
     // 12 = 4 (int, file format marker) + 8 (long, index version)
     $segmentNameCounter = $segmentsFile->readInt();
     $segmentsFile->seek(12);
     // 12 = 4 (int, file format marker) + 8 (long, index version)
     $segmentsFile->writeInt($segmentNameCounter + 1);
     // Flash output to guarantee that wrong value will not be loaded between unlock and
     // return (which calls $segmentsFile destructor)
     $segmentsFile->flush();
     Zend_Search_Lucene::releaseWriteLock($this->_directory, $lock);
     return '_' . base_convert($segmentNameCounter, 10, 36);
 }