application/hub/main/discovery/socket/class_PackageSocketDiscovery.php

   1 <?php
   2 /**
   3  * A socket discovery class
   4  *
   5  * @author              Roland Haeder <webmaster@ship-simu.org>
   6  * @version             0.0.0
   7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2012 Core Developer Team
   8  * @license             GNU GPL 3.0 or any newer version
   9  * @link                http://www.ship-simu.org
  10  *
  11  * This program is free software: you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation, either version 3 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  23  */
  24 class PackageSocketDiscovery extends BaseHubDiscovery implements DiscoverableSocket, Registerable {
  25         /**
  26          * Protected constructor
  27          *
  28          * @return      void
  29          */
  30         protected function __construct () {
  31                 // Call parent constructor
  32                 parent::__construct(__CLASS__);
  33         }
  34
  35         /**
  36          * Create an instance of this class
  37          *
  38          * @return      $discoveryInstance      An instance of this discovery class
  39          */
  40         public static final function createPackageSocketDiscovery () {
  41                 // Get an instance of this class
  42                 $discoveryInstance = new PackageSocketDiscovery();
  43
  44                 // Output debug message
  45                 $discoveryInstance->debugOutput('SOCKET-DISCOVERY: Initialized.');
  46
  47                 // Return the prepared instance
  48                 return $discoveryInstance;
  49         }
  50
  51         /**
  52          * Tries to dicover the right listener instance
  53          *
  54          * @param       $protocolName           Protocol name
  55          * @param       $packageData            Raw package data
  56          * @return      $listenerInstance       An instance of a Listenable instance or null
  57          */
  58         public function discoverListenerInstance ($protocolName, array $packageData) {
  59                 // Debug message
  60                 //* NOISY-DEBUG: */ $this->debugOutput('SOCKET-DISCOVERY: protocolName=' . $protocolName . ' - ENTERED!');
  61
  62                 /*
  63                  * Get the listener pool instance, we need to lookup the matching
  64                  * listener->poolInstance chain there.
  65                  */
  66                 $poolInstance = Registry::getRegistry()->getInstance('node')->getListenerPoolInstance();
  67
  68                 // Init listener instance
  69                 $listenerInstance = NULL;
  70
  71                 /*
  72                  * Now we need to choose again. It is whether we are speaking with a hub
  73                  * or with a client. So just handle it over to all listeners in this
  74                  * pool.
  75                  */
  76                 foreach ($poolInstance->getPoolEntriesInstance()->getArrayFromGroup($protocolName) as $listenerInstance) {
  77                         // Debug output
  78                         //* NOISY-DEBUG: */ $this->debugOutput('SOCKET-DISCOVERY: protocolName=' . $protocolName . ',listenerInstance=' . $listenerInstance->__toString());
  79
  80                         // Does the listener want that package?
  81                         if ($listenerInstance->ifListenerAcceptsPackageData($packageData)) {
  82                                 // This listener likes our package data, so abort here
  83                                 //* NOISY-DEBUG: */ $this->debugOutput('SOCKET-DISCOVERY: Listener is accepting package data.');
  84                                 break;
  85                         } // END - if
  86
  87                         // Debug output
  88                         //* NOISY-DEBUG: */ $this->debugOutput('SOCKET-DISCOVERY: Listener is NOT accepting package data.');
  89                 } // END - foreach
  90
  91                 // Return it
  92                 return $listenerInstance;
  93         }
  94
  95         /**
  96          * Tries to discover the right socket for given package data and returns a
  97          * matching socket resource for that protocol.
  98          *
  99          * @param       $packageData            Raw package data array
 100          * @return      $socketResource         A valid socket resource or FALSE if an error occured
 101          * @throws      NoListGroupException    If the procol group is not found in peer list
 102          * @throws      NullPointerException    If listenerInstance is NULL
 103          */
 104         public function discoverSocket (array $packageData) {
 105                 // Determine protocol name
 106                 $protocolName = $this->determineProtocolByPackageData($packageData);
 107
 108                 // Is it the same?
 109                 assert(strtoupper($protocolName) == $packageData[NetworkPackage::PACKAGE_DATA_PROTOCOL]);
 110
 111                 // Get the listener instance
 112                 $listenerInstance = $this->discoverListenerInstance($protocolName, $packageData);
 113
 114                 // If there is no listener who wants to have that package, we simply drop it here
 115                 if (is_null($listenerInstance)) {
 116                         // Abort with no resource
 117                         throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
 118                 } // END - if
 119
 120                 // Debug message
 121                 /* NOISY-DEBUG: */ $this->debugOutput('protocolName=' . $protocolName . ',packageData=' . print_r($packageData, true));
 122
 123                 /*
 124                  * Now we have the listener instance, we can determine the right
 125                  * resource to continue. The first step is to get the attached pool
 126                  * instance and pass over the whole package data to get the right
 127                  * socket.
 128                  */
 129                 $socketResource = $listenerInstance->getPoolInstance()->getSocketFromPackageData($packageData);
 130
 131                 // Debug message
 132                 //* NOISY-DEBUG: */ $this->debugOutput('socketResource=' . $socketResource . ',packageData=' . print_r($packageData, true));
 133
 134                 // Is it false, the recipient isn't known to us and we have no connection to it
 135                 if (($socketResource === false) || (!is_resource($socketResource)) || (socket_last_error($socketResource) > 0)) {
 136                         // Try to create a new socket resource
 137                         try {
 138                                 // Possibly noisy debug message
 139                                 /* NOISY-DEBUG: */ $this->debugOutput('SOCKET-DISCOVERY: Trying to establish a ' . strtoupper($protocolName) . ' connection to ' . $packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT] . ' ...');
 140
 141                                 // Get a socket resource from our factory (if succeeded)
 142                                 $socketResource = SocketFactory::createSocketFromPackageData($packageData, $protocolName);
 143                         } catch (SocketConnectionException $e) {
 144                                 // The connection fails of being established, so log it away
 145                                 $this->debugOutput('SOCKET-DISCOVERY: Caught ' . $e->__toString() . ',message=' . $e->getMessage());
 146                         }
 147                 } // END - if
 148
 149                 // Try to resolve the socket resource
 150                 try {
 151                         // Get the helper instance from registry
 152                         $helperInstance = Registry::getRegistry()->getInstance('connection');
 153
 154                         // Possibly noisy debug message
 155                         /* NOISY-DEBUG: */ $this->debugOutput('SOCKET-DISCOVERY: Going to resolve socket from peer state and given package data ...');
 156
 157                         // Resolve the peer's state (but ignore return value)
 158                         PeerStateResolver::resolveStateByPackage($helperInstance, $packageData, $socketResource);
 159                 } catch (InvalidSocketException $e) {
 160                         // This cannot be fixed, so log it away
 161                         $this->debugOutput('SOCKET-DISCOVERY: Cannot discover socket resource for recipient ' . $packageData[NetworkPackage::PACKAGE_DATA_RECIPIENT] . ': ' . $e->getMessage());
 162
 163                         // Make any failed attempts to 'false'
 164                         $socketResource = false;
 165                 }
 166
 167                 // And return it
 168                 //* NOISY-DEBUG: */ $this->debugOutput('SOCKET-DISCOVERY: socketResource=' . $socketResource . ',packageData=' . print_r($packageData, true));
 169                 return $socketResource;
 170         }
 171 }
 172
 173 // [EOF]
 174 ?>