<?php
/**
 * A general listener class
 *
 * @author		Roland Haeder <webmaster@shipsimu.org>
 * @version		0.0.0
 * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2015 Core 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 BaseListener extends BaseFrameworkSystem implements Visitable {
	// Exception code constants
	const EXCEPTION_INVALID_SOCKET                   = 0xa00;
	const EXCEPTION_SOCKET_ALREADY_REGISTERED        = 0xa01;
	const EXCEPTION_SOCKET_CREATION_FAILED           = 0xa02;
	const EXCEPTION_NO_SOCKET_ERROR                  = 0xa03;
	const EXCEPTION_CONNECTION_ALREADY_REGISTERED    = 0xa04;
	const EXCEPTION_UNEXPECTED_PACKAGE_STATUS        = 0xa05;
	const EXCEPTION_UNSUPPORTED_PACKAGE_CODE_HANDLER = 0xa06;
	const EXCEPTION_FINAL_CHUNK_VERIFICATION         = 0xa07;
	const EXCEPTION_INVALID_DATA_CHECKSUM            = 0xa08;

	/**
	 * Address (IP mostly) we shall listen on
	 */
	private $listenAddress = '0.0.0.0'; // This is the default and listens on all interfaces

	/**
	 * Port we shall listen on (or wait for incoming data)
	 */
	private $listenPort = 0; // This port MUST be changed by your application

	/**
	 * Whether we are in blocking or non-blocking mode (default: non-blocking
	 */
	private $blockingMode = FALSE;

	/**
	 * A peer pool instance
	 */
	private $poolInstance = NULL;

	/**
	 * Protected constructor
	 *
	 * @param	$className	Name of the class
	 * @return	void
	 */
	protected function __construct ($className) {
		// Call parent constructor
		parent::__construct($className);
	}

	/**
	 * Checks whether the given socket resource is a server socket
	 *
	 * @param	$socketResource		A valid socket resource
	 * @return	$isServerSocket		Whether the socket resource is a server socket
	 */
	protected function isServerSocketResource ($socketResource) {
		// Check it
		$isServerSocket = ((is_resource($socketResource)) && (!@socket_getpeername($socketResource, $peerName)));

		// We need to clear the error here if it is a resource
		if ($isServerSocket === TRUE) {
			// Clear the error
			//* DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('socketResource[]=' . gettype($socketResource));
			socket_clear_error($socketResource);
		} // END - if

		// Check peer name, it must be empty
		$isServerSocket = (($isServerSocket) && (empty($peerName)));

		// Return result
		return $isServerSocket;
	}

	/**
	 * Setter for listen address
	 *
	 * @param	$listenAddress	The address this listener should listen on
	 * @return	void
	 */
	protected final function setListenAddress ($listenAddress) {
		$this->listenAddress = (string) $listenAddress;
	}

	/**
	 * Getter for listen address
	 *
	 * @return	$listenAddress	The address this listener should listen on
	 */
	public final function getListenAddress () {
		return $this->listenAddress;
	}

	/**
	 * Setter for listen port
	 *
	 * @param	$listenPort		The port this listener should listen on
	 * @return	void
	 */
	protected final function setListenPort ($listenPort) {
		$this->listenPort = (int) $listenPort;
	}

	/**
	 * Getter for listen port
	 *
	 * @return	$listenPort		The port this listener should listen on
	 */
	public final function getListenPort () {
		return $this->listenPort;
	}

	/**
	 * "Setter" to set listen address from configuration entry
	 *
	 * @param	$configEntry	The configuration entry holding our listen address
	 * @return	void
	 */
	public final function setListenAddressByConfiguration ($configEntry) {
		$this->setListenAddress($this->getConfigInstance()->getConfigEntry($configEntry));
	}

	/**
	 * "Setter" to set listen port from configuration entry
	 *
	 * @param	$configEntry	The configuration entry holding our listen port
	 * @return	void
	 */
	public final function setListenPortByConfiguration ($configEntry) {
		$this->setListenPort($this->getConfigInstance()->getConfigEntry($configEntry));
	}

	/**
	 * Setter for blocking-mode
	 *
	 * @param	$blockingMode	Whether blocking-mode is disabled (default) or enabled
	 * @return	void
	 */
	protected final function setBlockingMode ($blockingMode) {
		$this->blockingMode = (boolean) $blockingMode;
	}

	/**
	 * Checks whether blocking-mode is enabled or disabled
	 *
	 * @return	$blockingMode	Whether blocking mode is disabled or enabled
	 */
	public final function isBlockingModeEnabled () {
		return $this->blockingMode;
	}

	/**
	 * Setter for peer pool instance
	 *
	 * @param	$poolInstance	The peer pool instance we shall set
	 * @return	void
	 */
	protected final function setPoolInstance (PoolablePeer $poolInstance) {
		$this->poolInstance = $poolInstance;
	}

	/**
	 * Getter for peer pool instance
	 *
	 * @return	$poolInstance	The peer pool instance we shall set
	 */
	public final function getPoolInstance () {
		return $this->poolInstance;
	}

	/**
	 * Getter for connection type
	 *
	 * @return	$connectionType		Connection type for this listener
	 */
	public final function getConnectionType () {
		// Wrap the real getter
		return $this->getProtocolName();
	}

	/**
	 * Registeres the given socket resource for "this" listener instance. This
	 * will be done in a seperate class to allow package writers to use it
	 * again.
	 *
	 * @param	$socketResource		A valid server socket resource
	 * @return	void
	 * @throws	InvalidServerSocketException		If the given resource is no server socket
	 * @throws	SocketAlreadyRegisteredException	If the given resource is already registered
	 */
	protected function registerServerSocketResource ($socketResource) {
		// First check if it is valid
		if (!$this->isServerSocketResource($socketResource)) {
			// No server socket
			throw new InvalidServerSocketException(array($this, $socketResource), self::EXCEPTION_INVALID_SOCKET);
		} elseif ($this->isServerSocketRegistered($socketResource)) {
			// Already registered
			throw new SocketAlreadyRegisteredException($this, self::EXCEPTION_SOCKET_ALREADY_REGISTERED);
		}

		// Get a socket registry instance (singleton)
		$registryInstance = SocketRegistryFactory::createSocketRegistryInstance();

		// Get a connection info instance
		$infoInstance = ConnectionInfoFactory::createConnectionInfoInstance($this->getProtocolName(), 'listener');

		// Will the info instance with listener data
		$infoInstance->fillWithListenerInformation($this);

		// Register the socket
		$registryInstance->registerSocket($infoInstance, $socketResource);

		// And set it here
		$this->setSocketResource($socketResource);
	}

	/**
	 * Checks whether given socket resource is registered in socket registry
	 *
	 * @param	$socketResource		A valid server socket resource
	 * @return	$isRegistered		Whether given server socket is registered
	 */
	protected function isServerSocketRegistered ($socketResource) {
		// Get a socket registry instance (singleton)
		$registryInstance = SocketRegistryFactory::createSocketRegistryInstance();

		// Get a connection info instance
		$infoInstance = ConnectionInfoFactory::createConnectionInfoInstance($this->getProtocolName(), 'listener');

		// Will the info instance with listener data
		$infoInstance->fillWithListenerInformation($this);

		// Check it
		$isRegistered = $registryInstance->isSocketRegistered($infoInstance, $socketResource);

		// Return result
		return $isRegistered;
	}

	/**
	 * Accepts the visitor to process the visit "request"
	 *
	 * @param	$visitorInstance	An instance of a Visitor class
	 * @return	void
	 */
	public function accept (Visitor $visitorInstance) {
		// Debug message
		//* DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(strtoupper($this->getProtocolName()) . '-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: ' . $visitorInstance->__toString() . ' has visited ' . $this->__toString() . ' - CALLED!');

		// Visit this listener
		$visitorInstance->visitListener($this);

		// Visit the pool if set
		if ($this->getPoolInstance() instanceof Poolable) {
			$this->getPoolInstance()->accept($visitorInstance);
		} // END - if

		// Debug message
		//* DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput(strtoupper($this->getProtocolName()) . '-LISTENER[' . __METHOD__ . ':' . __LINE__ . ']: ' . $visitorInstance->__toString() . ' has visited ' . $this->__toString() . ' - EXIT!');
	}

	/**
	 * Monitors incoming raw data from the handler and transfers it to the
	 * given receiver instance. This method should not be called, please call
	 * the decorator's version instead to separator node/client traffic.
	 *
	 * @return	void
	 * @throws	UnsupportedOperatorException	If this method is called by a mistake
	 */
	public function monitorIncomingRawData () {
		throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
	}
}

// [EOF]
?>