X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;ds=sidebyside;f=inc%2Fclasses%2Fmain%2Findex%2Fclass_BaseIndex.php;h=1b0b153317321254242616e9bd4a8c1120525d6f;hb=1bceb461c6e71bc2f97bdf1b7ab544055021a246;hp=25853eab1b924366470c0c2e04bf274198cc7d63;hpb=33a077568f330392f1a57f953cc8d94d89b6f949;p=core.git diff --git a/inc/classes/main/index/class_BaseIndex.php b/inc/classes/main/index/class_BaseIndex.php index 25853eab..1b0b1533 100644 --- a/inc/classes/main/index/class_BaseIndex.php +++ b/inc/classes/main/index/class_BaseIndex.php @@ -22,6 +22,11 @@ * along with this program. If not, see . */ class BaseIndex extends BaseFrameworkSystem { + /** + * Magic for this index + */ + const INDEX_MAGIC = 'INDEXv0.1'; + /** * Protected constructor * @@ -31,6 +36,189 @@ class BaseIndex extends BaseFrameworkSystem { protected function __construct ($className) { // Call parent constructor parent::__construct($className); + + // Calculate header size + $this->setHeaderSize( + strlen(self::INDEX_MAGIC) + + strlen(chr(BaseFile::SEPARATOR_HEADER_DATA)) + + BaseFile::LENGTH_COUNT + + strlen(chr(BaseFile::SEPARATOR_HEADER_ENTRIES)) + ); + + // Init counters and gaps array + $this->initCountersGapsArray(); + } + + /** + * Reads the file header + * + * @return void + */ + public function readFileHeader () { + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__)); + + // First rewind to beginning as the header sits at the beginning ... + $this->getIteratorInstance()->rewind(); + + // Then read it (see constructor for calculation) + $data = $this->getIteratorInstance()->read($this->getHeaderSize()); + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Read %d bytes (%d wanted).', __METHOD__, __LINE__, strlen($data), $this->getHeaderSize())); + + // Have all requested bytes been read? + assert(strlen($data) == $this->getHeaderSize()); + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__)); + + // Last character must be the separator + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] data(-1)=%s', __METHOD__, __LINE__, dechex(ord(substr($data, -1, 1))))); + assert(substr($data, -1, 1) == chr(BaseFile::SEPARATOR_HEADER_ENTRIES)); + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__)); + + // Okay, then remove it + $data = substr($data, 0, -1); + + // And update seek position + $this->updateSeekPosition(); + + /* + * Now split it: + * + * 0 => magic + * 1 => total entries + */ + $header = explode(chr(BaseFile::SEPARATOR_HEADER_DATA), $data); + + // Set it here + $this->setHeader($header); + + // Check if the array has only 3 elements + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] header(%d)=%s', __METHOD__, __LINE__, count($header), print_r($header, TRUE))); + assert(count($header) == 2); + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__)); + + // Check magic + assert($header[0] == self::INDEX_MAGIC); + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__)); + + // Check length of count + assert(strlen($header[1]) == BaseFile::LENGTH_COUNT); + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__)); + + // Decode count + $header[1] = hex2bin($header[1]); + + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] EXIT!', __METHOD__, __LINE__)); + } + + /** + * Flushes the file header + * + * @return void + */ + public function flushFileHeader () { + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__)); + + // Put all informations together + $header = sprintf('%s%s%s%s', + // Magic + self::INDEX_MAGIC, + + // Separator header data + chr(BaseFile::SEPARATOR_HEADER_DATA), + + // Total entries + str_pad($this->dec2hex($this->getCounter()), BaseFile::LENGTH_COUNT, '0', STR_PAD_LEFT), + + // Separator header<->entries + chr(BaseFile::SEPARATOR_HEADER_ENTRIES) + ); + + // Write it to disk (header is always at seek position 0) + $this->writeData(0, $header, FALSE); + + //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(sprintf('[%s:%d:] EXIT!', __METHOD__, __LINE__)); + } + + /** + * Initializes this index + * + * @param $fileName File name of this index + * @return void + * @todo Currently the index file is not cached, please implement a memory-handling class and if enough RAM is found, cache the whole index file. + */ + protected function initIndex ($fileName) { + // Append index file extension + $fileName .= $this->getConfigInstance()->getConfigEntry('index_extension'); + + // Get a file i/o pointer instance for index file + $fileInstance = ObjectFactory::createObjectByConfiguredName('index_file_class', array($fileName, $this)); + + // Get iterator instance + $iteratorInstance = ObjectFactory::createObjectByConfiguredName('file_iterator_class', array($fileInstance)); + + // Is the instance implementing the right interface? + assert($iteratorInstance instanceof SeekableWritableFileIterator); + + // Set iterator here + $this->setIteratorInstance($iteratorInstance); + + // Is the file's header initialized? + if (!$this->getIteratorInstance()->isFileHeaderInitialized()) { + // No, then create it (which may pre-allocate the index) + $this->getIteratorInstance()->createFileHeader(); + + // And pre-allocate a bit + $this->getIteratorInstance()->preAllocateFile('index'); + } // END - if + + // Load the file header + $this->readFileHeader(); + + // Count all entries in file + $this->getIteratorInstance()->analyzeFile(); + } + + /** + * Calculates minimum length for one entry/block + * + * @return $length Minimum length for one entry/block + */ + public function calculateMinimumBlockLength () { + // Calulcate it + $length = BaseFile::LENGTH_TYPE + strlen(chr(BaseFile::SEPARATOR_TYPE_POSITION)) + BaseFile::LENGTH_POSITION + strlen(chr(BaseFile::SEPARATOR_ENTRIES)); + + // Return it + return $length; + } + + /** + * Close a file source and set it's instance to null and the file name + * to empty. + * + * @return void + * @throws UnsupportedOperationException If this method is called + */ + public function closeFile () { + throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION); + } + + /** + * Determines whether the EOF has been reached + * + * @return $isEndOfFileReached Whether the EOF has been reached + * @throws UnsupportedOperationException If this method is called + */ + public function isEndOfFileReached () { + throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION); + } + + /** + * Getter for file name + * + * @return $fileName The current file name + * @throws UnsupportedOperationException If this method is called + */ + public function getFileName () { + throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION); } }