--- /dev/null
+<?php
+/**
+ * A PackageAssembler class to assemble a package content stream fragemented
+ * by PackageFragmenter back to a raw package data array.
+ *
+ * @author Roland Haeder <webmaster@shipsimu.org>
+ * @version 0.0.0
+ * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2015 Hub Developer Team
+ * @license GNU GPL 3.0 or any newer version
+ * @link http://www.shipsimu.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+class PackageAssembler extends BaseHubSystem implements Assembler, Registerable, Visitable {
+ /**
+ * Name for stacker holding raw data of multiple messages
+ */
+ const STACKER_NAME_MULTIPLE_MESSAGE = 'multiple_message';
+
+ /**
+ * Pending data
+ */
+ private $pendingData = '';
+
+ /**
+ * Private call-back methods
+ */
+ private $callbacks = array();
+
+ /**
+ * Protected constructor
+ *
+ * @return void
+ */
+ protected function __construct () {
+ // Call parent constructor
+ parent::__construct(__CLASS__);
+ }
+
+ /**
+ * Creates an instance of this class
+ *
+ * @param $packageInstance An instance of a Receivable class
+ * @return $assemblerInstance An instance of an Assembler class
+ */
+ public static final function createPackageAssembler (Receivable $packageInstance) {
+ // Get new instance
+ $assemblerInstance = new PackageAssembler();
+
+ // Set package instance here
+ $assemblerInstance->setPackageInstance($packageInstance);
+
+ // Create an instance of a raw data input stream
+ $streamInstance = ObjectFactory::createObjectByConfiguredName('node_raw_data_input_stream_class');
+
+ // And set it
+ $assemblerInstance->setInputStreamInstance($streamInstance);
+
+ // Now get a chunk handler instance
+ $handlerInstance = ChunkHandlerFactory::createChunkHandlerInstance();
+
+ // Set handler instance
+ $assemblerInstance->setHandlerInstance($handlerInstance);
+
+ // Get stacker instance
+ $stackInstance = ObjectFactory::createObjectByConfiguredName('multiple_message_stacker_class');
+
+ // Initialize the only one stack
+ $stackInstance->initStack(self::STACKER_NAME_MULTIPLE_MESSAGE);
+
+ // And add it
+ $assemblerInstance->setStackInstance($stackInstance);
+
+ // Return the prepared instance
+ return $assemblerInstance;
+ }
+
+ /**
+ * Checks whether the input buffer (stacker to be more preceise) is empty.
+ *
+ * @return $isInputBufferEmpty Whether the input buffer is empty
+ */
+ private function ifInputBufferIsEmpty () {
+ // Check it
+ $isInputBufferEmpty = $this->getPackageInstance()->getStackInstance()->isStackEmpty(NetworkPackage::STACKER_NAME_DECODED_HANDLED);
+
+ // Debug message
+ //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('PACKAGE-ASSEMBLER[' . __METHOD__ . ':' . __LINE__ . ']: isInputBufferEmpty=' . intval($isInputBufferEmpty));
+
+ // Return it
+ return $isInputBufferEmpty;
+ }
+
+ /**
+ * Checks whether given package content is completed (start/end markers are found)
+ *
+ * @param $packageContent An array with two elements: 'raw_data' and 'error_code'
+ * @return $isCompleted Whether the given package content is completed
+ */
+ private function isPackageContentCompleted (array $packageContent) {
+ // Check both
+ $isCompleted = $this->ifStartEndMarkersSet($packageContent[BaseRawDataHandler::PACKAGE_RAW_DATA]);
+
+ // Return status
+ return $isCompleted;
+ }
+
+ /**
+ * Assembles the content from $packageContent. This method does only
+ * initialize the whole process by creating a call-back which will then
+ * itself (99.9% of all cases) "explode" the decoded data stream and add
+ * it to a chunk assembler queue.
+ *
+ * If the call-back method or this would attempt to assemble the package
+ * chunks and (maybe) re-request some chunks from the sender, this would
+ * take to much time and therefore slow down this node again.
+ *
+ * @param $packageContent An array with two elements: 'raw_data' and 'error_code'
+ * @return void
+ * @throws UnsupportedPackageCodeHandlerException If the package code handler is not implemented
+ */
+ public function chunkPackageContent (array $packageContent) {
+ // Validate the package content array again
+ assert(
+ (isset($packageContent[BaseRawDataHandler::PACKAGE_RAW_DATA])) &&
+ (isset($packageContent[BaseRawDataHandler::PACKAGE_ERROR_CODE]))
+ );
+
+ // Construct call-back name from package error code
+ $this->callbacks[$packageContent[BaseRawDataHandler::PACKAGE_ERROR_CODE]] = 'handlePackageBy' . self::convertToClassName($packageContent[BaseRawDataHandler::PACKAGE_ERROR_CODE]);
+
+ // Abort if the call-back method is not there
+ if (!method_exists($this, $this->callbacks[$packageContent[BaseRawDataHandler::PACKAGE_ERROR_CODE]])) {
+ // Throw an exception
+ throw new UnsupportedPackageCodeHandlerException(array($this, $this->callbacks[$packageContent[BaseRawDataHandler::PACKAGE_ERROR_CODE]], $packageContent), BaseListener::EXCEPTION_UNSUPPORTED_PACKAGE_CODE_HANDLER);
+ } // END - if
+
+ // Call it back
+ call_user_func(array($this, $this->callbacks[$packageContent[BaseRawDataHandler::PACKAGE_ERROR_CODE]]), $packageContent);
+ }
+
+ /**************************************************************************
+ * Call-back methods for above method *
+ **************************************************************************/
+
+ /**
+ * Call-back handler to handle unhandled package data. This method
+ * "explodes" the string with the chunk separator from PackageFragmenter
+ * class, does some low checks on it and feeds it into another queue for
+ * verification and re-request for bad chunks.
+ *
+ * @param $packageContent An array with two elements: 'raw_data' and 'error_code'
+ * @return void
+ */
+ private function handlePackageByUnhandledPackage (array $packageContent) {
+ // Debug message
+ //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('PACKAGE-ASSEMBLER[' . __METHOD__ . ':' . __LINE__ . ']: packageData[' . BaseRawDataHandler::PACKAGE_RAW_DATA . ']=' . $packageContent[BaseRawDataHandler::PACKAGE_RAW_DATA]);
+
+ // Check for some conditions
+ if ((!$this->ifInputBufferIsEmpty()) || (!$this->isPackageContentCompleted($packageContent))) {
+ // Last chunk is not valid, so wait for more
+ $this->pendingData .= $packageContent[BaseRawDataHandler::PACKAGE_RAW_DATA];
+
+ // Debug message
+ //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('PACKAGE-ASSEMBLER[' . __METHOD__ . ':' . __LINE__ . ']: Partial data received. Waiting for more ... ( ' . strlen($packageContent[BaseRawDataHandler::PACKAGE_RAW_DATA]) . ' bytes)');
+ } else {
+ // Debug message
+ //* DEBUG */ self::createDebugInstance(__CLASS__)->debugOutput('PACKAGE-ASSEMBLER[' . __METHOD__ . ':' . __LINE__ . ': packageContent=' . print_r($packageContent, TRUE) . ',chunks='.print_r($chunks, TRUE));
+ }
+ }
+
+ /**
+ * Checks whether the assembler's pending data is empty which means it has
+ * no pending data left for handling ... ;-)
+ *
+ * @return $ifPendingDataIsEmpty Whether pending data is empty
+ */
+ public function isPendingDataEmpty () {
+ // A simbple check
+ $ifPendingDataIsEmpty = empty($this->pendingData);
+
+ // Return it
+ return $ifPendingDataIsEmpty;
+ }
+
+ /**
+ * Checks whether the assembler has multiple messages pending
+ *
+ * @return $isPending Whether the assembler has multiple messages pending
+ */
+ public function ifMultipleMessagesPending () {
+ // Determine it
+ $isPending = (!$this->getStackInstance()->isStackEmpty(self::STACKER_NAME_MULTIPLE_MESSAGE));
+
+ // Return it
+ //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('PACKAGE-ASSEMBLER[' . __METHOD__ . ':' . __LINE__ . ': isPending=' . intval($isPending));
+ return $isPending;
+ }
+
+ /**
+ * Handles the assembler's pending data
+ *
+ * @return void
+ */
+ public function handlePendingData () {
+ // Debug output
+ //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('PACKAGE-ASSEMBLER[' . __METHOD__ . ':' . __LINE__ . ']: Going to decode ' . strlen($this->pendingData) . ' Bytes of pending data. pendingData=' . $this->pendingData);
+
+ // Assert on condition
+ assert(!$this->isPendingDataEmpty());
+
+ // No markers set?
+ if (!$this->ifStartEndMarkersSet($this->pendingData)) {
+ // This will cause an assertition in next call, so simply wait for more data
+ //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('PACKAGE-ASSEMBLER[' . __METHOD__ . ':' . __LINE__ . ']: Pending data of ' . strlen($this->pendingData) . ' Bytes are incomplete, waiting for more ...');
+ //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('PACKAGE-ASSEMBLER[' . __METHOD__ . ':' . __LINE__ . ']: this->pendingData=' . $this->pendingData);
+ return;
+ } elseif (substr_count($this->pendingData, BaseRawDataHandler::STREAM_START_MARKER) > 1) {
+ /*
+ * Multiple messages found, so split off first message as the input
+ * stream can only handle one message per time.
+ */
+ foreach (explode(BaseRawDataHandler::STREAM_START_MARKER, $this->pendingData) as $message) {
+ // Prepend start marker again as it is needed to decode the message.
+ $message = BaseRawDataHandler::STREAM_START_MARKER . $message;
+
+ // Push it on stack
+ $this->getStackInstance()->pushNamed(self::STACKER_NAME_MULTIPLE_MESSAGE, $message);
+ } // END - foreach
+
+ // Clear pending data
+ $this->clearPendingData();
+
+ // ... and exit here
+ return;
+ }
+
+ // Init fake array
+ $packageContent = array(
+ BaseRawDataHandler::PACKAGE_RAW_DATA => $this->getInputStreamInstance()->streamData($this->pendingData),
+ BaseRawDataHandler::PACKAGE_ERROR_CODE => BaseRawDataHandler::SOCKET_ERROR_UNHANDLED
+ );
+
+ /*
+ * Clear pending data as it has been processed and will be handled some
+ * lines below.
+ */
+ $this->clearPendingData();
+
+ // Debug message
+ //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('PACKAGE-ASSEMBLER[' . __METHOD__ . ':' . __LINE__ . ']: Last block of partial data received. A total of ' . strlen($packageContent[BaseRawDataHandler::PACKAGE_RAW_DATA]) . ' bytes has been received.');
+
+ // Make sure last CHUNK_SEPARATOR is not there
+ if (substr($packageContent[BaseRawDataHandler::PACKAGE_RAW_DATA], -1, 1) == PackageFragmenter::CHUNK_SEPARATOR) {
+ // Remove it
+ $packageContent[BaseRawDataHandler::PACKAGE_RAW_DATA] = substr($packageContent[BaseRawDataHandler::PACKAGE_RAW_DATA], 0, -1);
+ } // END - if
+
+ /*
+ * "explode" the string from 'raw_data' with chunk separator to get an
+ * array of chunks. These chunks must then be verified by their
+ * checksums. Also the final chunk must be handled.
+ */
+ $chunks = explode(PackageFragmenter::CHUNK_SEPARATOR, $packageContent[BaseRawDataHandler::PACKAGE_RAW_DATA]);
+
+ // Add all chunks because the last final chunk is found
+ //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('PACKAGE-ASSEMBLER[' . __METHOD__ . ':' . __LINE__ . ']: Going to add ' . count($chunks) . ' to chunk handler ...');
+ $this->getHandlerInstance()->addAllChunksWithFinal($chunks);
+ }
+
+ /**
+ * Handles multiple messages.
+ *
+ * @return void
+ */
+ public function handleMultipleMessages () {
+ // Assert on condition
+ assert($this->ifMultipleMessagesPending());
+ assert($this->isPendingDataEmpty());
+
+ // "Pop" next entry from stack and set it as new pending data
+ $this->pendingData = $this->getStackInstance()->popNamed(self::STACKER_NAME_MULTIPLE_MESSAGE);
+
+ // And handle it
+ $this->handlePendingData();
+ }
+
+ /**
+ * Accepts the visitor to process the visit "request"
+ *
+ * @param $visitorInstance An instance of a Visitor class
+ * @return void
+ */
+ public function accept (Visitor $visitorInstance) {
+ // Visit the assembler
+ $visitorInstance->visitAssembler($this);
+ }
+
+ /**
+ * Clears pending data
+ *
+ * @return void
+ */
+ public function clearPendingData () {
+ // Clear it
+ $this->pendingData = '';
+ }
+}
+
+// [EOF]
+?>
projects / hub.git / blobdiff