org.netfrag.glib/DesignPattern/RemoteProxy.php

<?php
/**
 * This file contains the DesignPattern::RemoteProxy class
 *
 * @author Andreas Motl <andreas.motl@ilo.de>
 * @package org.netfrag.glib
 * @name DesignPattern::RemoteProxy
 * @filesource
 *
 *
 * <b>Cvs-Log:</b>
 *
 * <pre>
 * -------------------------------------------------------------------------
 *    $Id: RemoteProxy.php,v 1.4 2003/03/05 16:32:19 joko Exp $
 * -------------------------------------------------------------------------
 *    $Log: RemoteProxy.php,v $
 *    Revision 1.4  2003/03/05 16:32:19  joko
 *    updated docu (phpDocumentor testing....)
 *
 *    Revision 1.3  2003/03/05 16:10:17  joko
 *    updated docu (phpDocumentor testing....)
 *
 *    Revision 1.2  2003/03/05 12:14:02  joko
 *    renamed method
 *    constructor argument expansion
 *
 *    Revision 1.1  2003/03/03 22:06:46  joko
 *    refactored from Data::Driver::Proxy
 *
 *    Revision 1.3  2003/03/01 04:56:38  joko
 *    new comment style for large blocks - stolen from phpHtmlLib
 *    commit-log encapsulated into such a block
 *    introduced some documentation
 *    refactored todo (now also inside a stylish block)
 *
 *    Revision 1.2  2003/02/13 21:48:09  joko
 *    + caching mechanisms more configurable now
 *
 *    Revision 1.1  2003/02/09 17:23:21  joko
 *    + refactored from flib/Application/RPC/ProxyObject.php
 *
 *    Revision 1.7  2003/02/03 03:31:38  jonen
 *    - moved '$encoder->toISO()' to 'Remote.php'
 *
 *    Revision 1.6  2002/12/22 13:26:20  jonen
 *    + added support of tangram independent id (e.g. Data::UUID) toggled by option at conrtuctor
 *
 *    Revision 1.5  2002/12/18 22:36:49  jonen
 *    + added support to get remote objects via backend via 'guid'
 *    + renamed '_loadBackend' to '_loadRemote'
 *    + constructor now accepts additional options:
 *      + remote: try to get object via '_loadRemote' ...
 *      + oid: use the given identifier as an 'oid' when doing '_loadRemote'
 *      + guid: use the given identifier as a 'guid' when doing '_loadRemote'
 *
 *    Revision 1.4  2002/12/12 02:46:31  joko
 *    + state (session) gets flushed when data was successfully loaded from remote side
 *    + fixed _loadBackend
 *    + fixed flushState
 *
 *    Revision 1.3  2002/12/06 04:12:54  joko
 *    + replaced 'xyzCache' through 'xyzProxy'
 *    + function store(...)
 *
 *    Revision 1.2  2002/12/05 21:44:09  joko
 *    + debugging
 *
 *    Revision 1.1  2002/12/01 17:23:58  joko
 *    + initial check-in
 *
 *    Revision 1.11  2002/11/12 06:05:58  cvsjoko
 *    + renamed class: Text_Encode -> TextEncode
 *
 *    Revision 1.10  2002/10/29 19:15:33  cvsjoko
 *    - moved utf8/iso-conversion to lib/utils/Text_Encode.php
 *
 *    Revision 1.9  2002/10/26 12:32:36  cvsjoko
 *    - removed debugging via "print"
 *    + added generic logging via PEAR::Log
 *
 *    Revision 1.8  2002/10/22 09:51:38  cvsmax
 *    + moved semi-method 'createBackend' to method $site->user->create at User.class.php
 *
 *    Revision 1.7  2002/10/21 18:27:09  cvsjoko
 *    - manually disabled any form of caching
 *
 *    Revision 1.6  2002/10/17 03:48:47  cvsmax
 *    + new
 *       + function _createBackend      create new Backend
 *       + function _create             api-create
 *
 *    Revision 1.5  2002/10/16 03:37:54  cvsjoko
 *    + bugfix: wrong comparison in restriction to save to array
 *
 *    Revision 1.4  2002/10/10 03:04:23  cvsjoko
 *    + no debug-output
 *
 *    Revision 1.3  2002/10/10 03:03:27  cvsjoko
 *    + bugfix: save object to cache only if payload from backend isn't empty
 *
 *    Revision 1.2  2002/10/10 02:40:06  cvsjoko
 *    + new level of data-caching (session and persistant)
 *        + function _loadState loads data from session
 *        + function _saveState saves data to session
 *        + function save               api-save (session & backend)
 *        + function _commit    saves data to backend
 *    + handy utils
 *        + function _setAttributes
 *        + function flushState
 *
 *    Revision 1.1  2002/10/09 00:51:39  cvsjoko
 *    + new
 * -------------------------------------------------------------------------
 * </pre>
 *
 */


/**
 * Load required modules:
 *
 */
loadModule('DesignPattern::Proxy');


/**
 * Data::Driver::Proxy  --  Multiple stage data fetching and caching
 *
 *
 * This class (Data::Driver::Proxy) provides an abstract framework 
 * for loading/saving arbitrary data from/to data storages interfaced 
 * by storage *proxy*-drivers.
 * Don't mix these up with the concrete storage *handle*-drivers 
 * doing the lowlevel stuff (opening files, talking sql, etc.).
 * These proxy-drivers are "just" wrappers around them 
 * providing a more highlevel, consistent API making
 * it easier for Data::Driver::Proxy to do its main work:
 *
 * Multiple stage data fetching and caching:
 *
 * <pre>
 *
 * DATA, ...
 *    ... also refered to as data, should be handled as 
 *    something called data.
 *
 * STAGES
 *    x native php4 session: serialized payload
 *    x single rdbms table: serialized payload
 *       x ... via custom database wrapper
 *          x included php-file, included php-library
 *          o object, component, package, callbacks
 *       x ... via php PEAR DB abstraction objects
 *    x remote objects (items): flat attribute hash
 *       o use Data::Object::Identity
 *       o via Data::Driver::Proxy::RPC or others
 *       o Data::Object::Encoder: encodes/decodes values
 *       o Data::Object::Interpolator: interpolates/resolves references
 * 
 * WORK
 *    x move data transparently around between these stages
 *
 * TOOLS
 *
 * x Overview - Packages, Handlers and Stages:
 *     This is weird.  ;-)
 *     - A Package can be instantiated by its namespaced classname
 *       e.g.: "mkObject('My::Package');"
 *     - A Package can be a Handler for Data::Driver::Proxy
 *     - A Handler implements exactly one Stage
 *     - Data::Driver::Proxy itself embeds these Stages:
 *        x php4-session
 *        x rdbms-table
 *     - An example Handler is Data::Driver::RPC::Remote
 *
 * x Handlers:
 *    x Data::Driver::RPC::Remote
 *        Interacts with a RPC::XML server (todo: talk SOAP!) 
 *        using PEAR::XML::RPC.
 *        It can cache data for "disconnected mode" using the
 *    o Data::Driver::phpHtmlLib
 *    o Data::Driver::PEAR::DB
 *    x Data::Driver::PEAR::Tree (via Data::Lift)
 *
 * </pre>
 *
 *
 * An attempt to implement some software design patterns
 * --- RemoteProxyPattern
 *
 * @link http://c2.com/cgi-bin/wiki?ProxyPattern
 *
 * @author Andreas Motl <andreas.motl@ilo.de>
 * @link http://www.netfrag.org/~joko/
 *
 * @copyright (c) 2003 - All Rights reserved.
 * @license GNU LGPL (GNU Lesser General Public License)
 * @link http://www.gnu.org/licenses/lgpl.txt
 *
 * @package org.netfrag.glib
 * @name DesignPattern::RemoteProxy
 *
 *
 * @todo
 * <pre>
 * x extend options to en-/disable caching via a) session and/or b) database
 *   o make feature available via runtime setter-method to these options
 * o use PEAR::Cache for caching purposes!!!
 * o refactor database access: use PEAR for this! no more 'connectdb' here!!!
 * o make database connection more flexible to make possible
 *     to have different (probably named) proxy databases (besides a "main database")
 * o rename this to Data::Proxy? or split into Data::Query, Data::Result and Data::Wrapper?
 * </pre>
 *
 */
class DesignPattern_RemoteProxy extends DesignPattern_Proxy {

  var $objectId;
  // purpose ...
  var $meta;
  var $payload;
  var $attributes;
  var $backend;

  function DesignPattern_RemoteProxy($objectId = "", $options = array() ) {
    logp(get_class($this) . "->new()", PEAR_LOG_INFO);
    global $proxy;

    // 2003-03-05 - modified constructor
    // expand objectId
    if (is_array($objectId)) {
      $options = $objectId[1];
      $objectId = $objectId[0];
    }

    // trace
      //print Dumper($objectId, $options);

    // initialization/startup
      $this->_init_meta_options($objectId, $options);
      $this->_init_caching();
      $this->_init_load();

    //print Dumper($this);

  }

  function _init_meta_options( $objectId="", $options = array() ) {
    $this->meta = $options;

    if ($objectId) {
      $this->objectId = $objectId;
      
      // set default load mechanism
      if ( $this->meta[remote] && ((!$this->meta[oid] && !$this->meta[guid]) || ($this->meta[oid] && $this->meta[guid])) && (!$this->meta[key]) ) {
        $this->meta[oid] = 1;
      }
      
    }
  }

  function _init_caching() {
    
    if ($this->meta[cache][session]) {
      session_register_safe("proxy");
    }  

    if ($this->meta[remote]) {
      //$this->backend = mkObject('Data::Driver::RPC::Remote', $this->meta[rpcinfo]);
      $this->backend = php::mkComponent('DataSource::Proxy::XMLRPC', $this->meta[rpcinfo]);
    }
  }

  function _init_load() {
    if ($this->objectId) {
      $this->load();
      //$this->_saveProxy();
    }
  }


  function load() {
    logp(get_class($this) . "->load()", PEAR_LOG_INFO);
    if (!$this->_loadState()) {
      if (!$this->_loadProxy()) {

        // just load object from remote side if its flagged to be a remote one ...
        if ($this->meta[remote]) {
          $this->_loadRemote();
        }

      }
    }
  }  

  function save($data, $type) {
    $this->_setAttributes($data);
    $this->_saveState();
    if ($type == 'commit') {
      $this->_commit();
    }
    if ($type == 'create') {
      $this->_create();
    }
  }  

  function flush() {
    $this->flushState();
    $this->flushProxy();
  }      

  function _commit() {
    $this->_saveBackend($this->attributes);
    $this->flushState();
    $this->flushProxy();
  }  


  // TODO: make this work
  /*
  function _create() {
    $this->_createBackend($this->attributes);
    $this->flushState();
    $this->flushProxy();
  }  
  */

  function getResult() {
    if (!$this->meta[decoded]) {
      $this->_decode();
      $this->_saveState();
    }
    return $this->attributes;
  }

  function _setAttributes($data) {
    $this->attributes = $data;
  }

  function flushProxy() {
        connectdb();
    $sql = "DELETE FROM f_proxy WHERE oid='$this->objectId'";
    send_sql($sql);
  }
  
  function flushState() {
    global $proxy;
    unset($proxy[$this->objectId]);
    $this->meta[decoded] = 0;
  }

  function _loadState() {
    global $proxy;

    // trace
      //print Dumper($this);

    // debug
      logp(get_class($this) . "->_loadState()");
      
    if ($this->attributes = $proxy[$this->objectId]) {
      //print "_loadState:" . dumpVar($this->attributes);
      $this->meta[decoded] = 1;
      // TODO: make a parameter from this (0 deactivates session-layer)
      return 0;
    }
  }

  function _saveState() {
    global $proxy;
    logp(get_class($this) . "->_saveState()");
    $proxy[$this->objectId] = $this->attributes;
    //print "_saveState: " . dumpVar($this->attributes);
    // TODO: throw exception-message back to user if operation fails
  }

  function _loadProxy() {
    
    // FIXME!
    if (!$this->meta[cache][db]) { return; }
    
    // trace & debug
      //print Dumper($this);
      logp(get_class($this) . "->_loadProxy()");
      
    connectdb();
    $sql = "SELECT payload FROM f_proxy WHERE oid='$this->objectId'";
    if ($res = send_sql($sql)) {
      $row = mysql_fetch_array($res, MYSQL_ASSOC);
      if ($row) {
        $this->payload = $row[payload];
        // TODO: make a parameter from this (0 deactivates mysqldb-layer)
        return 0;
      }
    }
  }
  
  // TODO: use PEAR here
  function _saveProxy() {

    // FIXME!
    if (!$this->meta[cache][db]) { return; }

    logp(get_class($this) . "->_saveProxy()");
        connectdb();
        if ($this->payload) {
      //$sql = "INSERT INTO f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'";
      $sql = "INSERT INTO f_proxy SET oid='$this->objectId', payload='$this->payload'";
      if (!send_sql($sql)) {
        $sql = "UPDATE f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'";
        send_sql($sql);
      }
    }
  }
  
  function _loadRemote() {
    logp(get_class($this) . "->_loadRemote()");
    
    // trace
      //print Dumper($this->meta);
        
    // TODO: test backend for reachability first (eventually cache this information and "reset" it by another party)
    
    // 1. check backend-handle
    if (!$this->backend) {
      logp(get_class($this) . "->_loadRemote: no backend handle, please check argument 'rpcinfo'", PEAR_LOG_CRIT);
      return;
    }
    
    // determine backend action by metadata
      // check for guid or oid
      if ($this->meta[guid]) {
        if (!$this->objectId) {
          logp(get_class($this) . "->_loadRemote: argument 'guid' requires valid objectId", PEAR_LOG_WARNING);
          return;
        }
        if (!$this->meta[classname]) {
          logp(get_class($this) . "->_loadRemote: argument 'guid' requires 'classname'", PEAR_LOG_WARNING);
          return;
        }
        $args = array( guid => $this->objectId, classname => $this->meta[classname] );
        $result = $this->backend->send('getObjectByGuid', $args );

      } elseif ($this->meta[oid]) {
        if (!$this->objectId) {
          logp(get_class($this) . "->_loadRemote: argument 'oid' requires valid objectId", PEAR_LOG_WARNING);
          return;
        }
        $result = $this->backend->send('getObject', $this->objectId);

      } elseif ($this->meta[key]) {
        if (!$this->meta[command]) {
          logp(get_class($this) . "->_loadRemote: argument 'key' requires 'command'", PEAR_LOG_WARNING);
          return;
        }
        /*
        if (!$this->meta[query]) {
          logp(get_class($this) . "->_loadRemote: argument 'key' requires 'query'", PEAR_LOG_WARNING);
          return;
        }
        */
        $result = $this->backend->send($this->meta[command], $this->meta[query]);
        
      }


    if ($result) {
      //print "result: " . dumpVar($result) . "<br>";
      if (count($result) == 0) { return; }
      
      // FIXME: this is dangerous!
      if ($_GET[debug]) {
        print Dumper($result);
      }
      
      $this->payload = serialize($result);
      // ----- move this to _encode some times
      
      $this->_saveProxy();
      //print "oid: $this->objectId<br>";
      $this->flushState();
    } else {
      //print "Error in _loadRemote!!!<br>";
      logp(get_class($this) . "->_loadRemote: error while trying to talk to remote side", PEAR_LOG_CRIT);
    }
    
  }
  
  function _saveBackend($result) {
    logp(get_class($this) . "->_saveBackend()");

    //$encoder = new TextEncode($result);
    //$encoder->toUTF8();

    // check for guid or oid
    if($this->meta[guid]) {
      $args = array( 'guid' => $this->objectId, 'classname' => $this->meta[classname], 'data' => $result );
      $response = $this->backend->send('saveObjectByGuid', $args, array( utf8 => 1) );
    }
    if($this->meta[oid]) {
      $response = $this->backend->send('saveObject', array('oid' => $this->objectId, 'data' => $result), array( utf8 => 1)  );
    }
  }

  function _decode() {
    // fill attributes-hashtable from message-hashtable
    if (!$this->payload) { return; }
    //if ($this->attributes = $backend->decodeData($this->payload)) {
    if ($this->attributes = unserialize($this->payload)) {
      $this->meta[decoded] = 1;
    }
  }
  
  function store($struct) {
    $this->payload = serialize($struct);
    $this->_saveProxy();
  }

}

?>
1	joko	1.1	<?php
2	joko	1.3	/**
3			* This file contains the DesignPattern::RemoteProxy class
4			*
5			* @author Andreas Motl <andreas.motl@ilo.de>
6			* @package org.netfrag.glib
7			* @name DesignPattern::RemoteProxy
8	joko	1.4	* @filesource
9	joko	1.3	*
10	joko	1.4	*
11			* <b>Cvs-Log:</b>
12			*
13			* <pre>
14	joko	1.1	* -------------------------------------------------------------------------
15	joko	1.5	* $Id: RemoteProxy.php,v 1.4 2003/03/05 16:32:19 joko Exp $
16	joko	1.1	* -------------------------------------------------------------------------
17	joko	1.2	* $Log: RemoteProxy.php,v $
18	joko	1.5	* Revision 1.4 2003/03/05 16:32:19 joko
19			* updated docu (phpDocumentor testing....)
20			*
21	joko	1.4	* Revision 1.3 2003/03/05 16:10:17 joko
22			* updated docu (phpDocumentor testing....)
23			*
24	joko	1.3	* Revision 1.2 2003/03/05 12:14:02 joko
25			* renamed method
26			* constructor argument expansion
27			*
28	joko	1.2	* Revision 1.1 2003/03/03 22:06:46 joko
29			* refactored from Data::Driver::Proxy
30			*
31	joko	1.1	* Revision 1.3 2003/03/01 04:56:38 joko
32			* new comment style for large blocks - stolen from phpHtmlLib
33			* commit-log encapsulated into such a block
34			* introduced some documentation
35			* refactored todo (now also inside a stylish block)
36			*
37			* Revision 1.2 2003/02/13 21:48:09 joko
38			* + caching mechanisms more configurable now
39			*
40			* Revision 1.1 2003/02/09 17:23:21 joko
41			* + refactored from flib/Application/RPC/ProxyObject.php
42			*
43			* Revision 1.7 2003/02/03 03:31:38 jonen
44			* - moved '$encoder->toISO()' to 'Remote.php'
45			*
46			* Revision 1.6 2002/12/22 13:26:20 jonen
47			* + added support of tangram independent id (e.g. Data::UUID) toggled by option at conrtuctor
48			*
49			* Revision 1.5 2002/12/18 22:36:49 jonen
50			* + added support to get remote objects via backend via 'guid'
51			* + renamed '_loadBackend' to '_loadRemote'
52			* + constructor now accepts additional options:
53			* + remote: try to get object via '_loadRemote' ...
54			* + oid: use the given identifier as an 'oid' when doing '_loadRemote'
55			* + guid: use the given identifier as a 'guid' when doing '_loadRemote'
56			*
57			* Revision 1.4 2002/12/12 02:46:31 joko
58			* + state (session) gets flushed when data was successfully loaded from remote side
59			* + fixed _loadBackend
60			* + fixed flushState
61			*
62			* Revision 1.3 2002/12/06 04:12:54 joko
63			* + replaced 'xyzCache' through 'xyzProxy'
64			* + function store(...)
65			*
66			* Revision 1.2 2002/12/05 21:44:09 joko
67			* + debugging
68			*
69			* Revision 1.1 2002/12/01 17:23:58 joko
70			* + initial check-in
71			*
72			* Revision 1.11 2002/11/12 06:05:58 cvsjoko
73			* + renamed class: Text_Encode -> TextEncode
74			*
75			* Revision 1.10 2002/10/29 19:15:33 cvsjoko
76			* - moved utf8/iso-conversion to lib/utils/Text_Encode.php
77			*
78			* Revision 1.9 2002/10/26 12:32:36 cvsjoko
79			* - removed debugging via "print"
80			* + added generic logging via PEAR::Log
81			*
82			* Revision 1.8 2002/10/22 09:51:38 cvsmax
83			* + moved semi-method 'createBackend' to method $site->user->create at User.class.php
84			*
85			* Revision 1.7 2002/10/21 18:27:09 cvsjoko
86			* - manually disabled any form of caching
87			*
88			* Revision 1.6 2002/10/17 03:48:47 cvsmax
89			* + new
90			* + function _createBackend create new Backend
91			* + function _create api-create
92			*
93			* Revision 1.5 2002/10/16 03:37:54 cvsjoko
94			* + bugfix: wrong comparison in restriction to save to array
95			*
96			* Revision 1.4 2002/10/10 03:04:23 cvsjoko
97			* + no debug-output
98			*
99			* Revision 1.3 2002/10/10 03:03:27 cvsjoko
100			* + bugfix: save object to cache only if payload from backend isn't empty
101			*
102			* Revision 1.2 2002/10/10 02:40:06 cvsjoko
103			* + new level of data-caching (session and persistant)
104			* + function _loadState loads data from session
105			* + function _saveState saves data to session
106			* + function save api-save (session & backend)
107			* + function _commit saves data to backend
108			* + handy utils
109			* + function _setAttributes
110			* + function flushState
111			*
112			* Revision 1.1 2002/10/09 00:51:39 cvsjoko
113			* + new
114			* -------------------------------------------------------------------------
115	joko	1.4	* </pre>
116			*
117	joko	1.1	*/
118
119	joko	1.4
120
121
122			/**
123			* Load required modules:
124			*
125			*/
126			loadModule('DesignPattern::Proxy');
127
128
129	joko	1.1	/**
130			* Data::Driver::Proxy -- Multiple stage data fetching and caching
131			*
132			*
133			* This class (Data::Driver::Proxy) provides an abstract framework
134			* for loading/saving arbitrary data from/to data storages interfaced
135			* by storage proxy-drivers.
136			* Don't mix these up with the concrete storage handle-drivers
137			* doing the lowlevel stuff (opening files, talking sql, etc.).
138			* These proxy-drivers are "just" wrappers around them
139			* providing a more highlevel, consistent API making
140			* it easier for Data::Driver::Proxy to do its main work:
141			*
142			* Multiple stage data fetching and caching:
143			*
144	joko	1.4	* <pre>
145			*
146	joko	1.1	* DATA, ...
147			* ... also refered to as data, should be handled as
148			* something called data.
149			*
150			* STAGES
151			* x native php4 session: serialized payload
152			* x single rdbms table: serialized payload
153			* x ... via custom database wrapper
154			* x included php-file, included php-library
155			* o object, component, package, callbacks
156			* x ... via php PEAR DB abstraction objects
157			* x remote objects (items): flat attribute hash
158			* o use Data::Object::Identity
159			* o via Data::Driver::Proxy::RPC or others
160			* o Data::Object::Encoder: encodes/decodes values
161			* o Data::Object::Interpolator: interpolates/resolves references
162			*
163			* WORK
164			* x move data transparently around between these stages
165			*
166			* TOOLS
167			*
168			* x Overview - Packages, Handlers and Stages:
169			* This is weird. ;-)
170			* - A Package can be instantiated by its namespaced classname
171			* e.g.: "mkObject('My::Package');"
172			* - A Package can be a Handler for Data::Driver::Proxy
173			* - A Handler implements exactly one Stage
174			* - Data::Driver::Proxy itself embeds these Stages:
175			* x php4-session
176			* x rdbms-table
177			* - An example Handler is Data::Driver::RPC::Remote
178			*
179			* x Handlers:
180			* x Data::Driver::RPC::Remote
181			* Interacts with a RPC::XML server (todo: talk SOAP!)
182			* using PEAR::XML::RPC.
183			* It can cache data for "disconnected mode" using the
184			* o Data::Driver::phpHtmlLib
185			* o Data::Driver::PEAR::DB
186			* x Data::Driver::PEAR::Tree (via Data::Lift)
187			*
188	joko	1.4	* </pre>
189			*
190			*
191			* An attempt to implement some software design patterns
192	joko	1.3	* --- RemoteProxyPattern
193			*
194			* @link http://c2.com/cgi-bin/wiki?ProxyPattern
195			*
196			* @author Andreas Motl <andreas.motl@ilo.de>
197			* @link http://www.netfrag.org/~joko/
198			*
199			* @copyright (c) 2003 - All Rights reserved.
200			* @license GNU LGPL (GNU Lesser General Public License)
201			* @link http://www.gnu.org/licenses/lgpl.txt
202			*
203			* @package org.netfrag.glib
204			* @name DesignPattern::RemoteProxy
205			*
206	joko	1.4	*
207	joko	1.3	* @todo
208			* <pre>
209	joko	1.5	* x extend options to en-/disable caching via a) session and/or b) database
210			* o make feature available via runtime setter-method to these options
211			* o use PEAR::Cache for caching purposes!!!
212			* o refactor database access: use PEAR for this! no more 'connectdb' here!!!
213			* o make database connection more flexible to make possible
214			* to have different (probably named) proxy databases (besides a "main database")
215			* o rename this to Data::Proxy? or split into Data::Query, Data::Result and Data::Wrapper?
216	joko	1.3	* </pre>
217	joko	1.1	*
218			*/
219			class DesignPattern_RemoteProxy extends DesignPattern_Proxy {
220
221			var $objectId;
222			// purpose ...
223			var $meta;
224			var $payload;
225			var $attributes;
226			var $backend;
227
228			function DesignPattern_RemoteProxy($objectId = "", $options = array() ) {
229			logp(get_class($this) . "->new()", PEAR_LOG_INFO);
230			global $proxy;
231
232	joko	1.2	// 2003-03-05 - modified constructor
233			// expand objectId
234			if (is_array($objectId)) {
235			$options = $objectId[1];
236			$objectId = $objectId[0];
237			}
238
239	joko	1.1	// trace
240			//print Dumper($objectId, $options);
241
242			// initialization/startup
243			$this->_init_meta_options($objectId, $options);
244			$this->_init_caching();
245			$this->_init_load();
246
247	joko	1.2	//print Dumper($this);
248
249	joko	1.1	}
250
251			function _init_meta_options( $objectId="", $options = array() ) {
252			$this->meta = $options;
253
254			if ($objectId) {
255			$this->objectId = $objectId;
256
257			// set default load mechanism
258			if ( $this->meta[remote] && ((!$this->meta[oid] && !$this->meta[guid]) \|\| ($this->meta[oid] && $this->meta[guid])) && (!$this->meta[key]) ) {
259			$this->meta[oid] = 1;
260			}
261
262			}
263			}
264
265			function _init_caching() {
266
267			if ($this->meta[cache][session]) {
268			session_register_safe("proxy");
269			}
270
271			if ($this->meta[remote]) {
272			//$this->backend = mkObject('Data::Driver::RPC::Remote', $this->meta[rpcinfo]);
273	joko	1.2	$this->backend = php::mkComponent('DataSource::Proxy::XMLRPC', $this->meta[rpcinfo]);
274	joko	1.1	}
275			}
276
277			function _init_load() {
278			if ($this->objectId) {
279			$this->load();
280			//$this->_saveProxy();
281			}
282			}
283
284
285			function load() {
286			logp(get_class($this) . "->load()", PEAR_LOG_INFO);
287			if (!$this->_loadState()) {
288			if (!$this->_loadProxy()) {
289
290			// just load object from remote side if its flagged to be a remote one ...
291			if ($this->meta[remote]) {
292			$this->_loadRemote();
293			}
294
295			}
296			}
297			}
298
299			function save($data, $type) {
300			$this->_setAttributes($data);
301			$this->_saveState();
302			if ($type == 'commit') {
303			$this->_commit();
304			}
305			if ($type == 'create') {
306			$this->_create();
307			}
308			}
309
310			function flush() {
311			$this->flushState();
312			$this->flushProxy();
313			}
314
315			function _commit() {
316			$this->_saveBackend($this->attributes);
317			$this->flushState();
318			$this->flushProxy();
319			}
320
321
322			// TODO: make this work
323			/*
324			function _create() {
325			$this->_createBackend($this->attributes);
326			$this->flushState();
327			$this->flushProxy();
328			}
329			*/
330
331	joko	1.2	function getResult() {
332	joko	1.1	if (!$this->meta[decoded]) {
333			$this->_decode();
334			$this->_saveState();
335			}
336			return $this->attributes;
337			}
338
339			function _setAttributes($data) {
340			$this->attributes = $data;
341			}
342
343			function flushProxy() {
344			connectdb();
345			$sql = "DELETE FROM f_proxy WHERE oid='$this->objectId'";
346			send_sql($sql);
347			}
348
349			function flushState() {
350			global $proxy;
351			unset($proxy[$this->objectId]);
352			$this->meta[decoded] = 0;
353			}
354
355			function _loadState() {
356			global $proxy;
357
358			// trace
359			//print Dumper($this);
360
361			// debug
362			logp(get_class($this) . "->_loadState()");
363
364			if ($this->attributes = $proxy[$this->objectId]) {
365			//print "_loadState:" . dumpVar($this->attributes);
366			$this->meta[decoded] = 1;
367			// TODO: make a parameter from this (0 deactivates session-layer)
368			return 0;
369			}
370			}
371
372			function _saveState() {
373			global $proxy;
374			logp(get_class($this) . "->_saveState()");
375			$proxy[$this->objectId] = $this->attributes;
376			//print "_saveState: " . dumpVar($this->attributes);
377			// TODO: throw exception-message back to user if operation fails
378			}
379
380			function _loadProxy() {
381
382			// FIXME!
383			if (!$this->meta[cache][db]) { return; }
384
385			// trace & debug
386			//print Dumper($this);
387			logp(get_class($this) . "->_loadProxy()");
388
389			connectdb();
390			$sql = "SELECT payload FROM f_proxy WHERE oid='$this->objectId'";
391			if ($res = send_sql($sql)) {
392			$row = mysql_fetch_array($res, MYSQL_ASSOC);
393			if ($row) {
394			$this->payload = $row[payload];
395			// TODO: make a parameter from this (0 deactivates mysqldb-layer)
396			return 0;
397			}
398			}
399			}
400
401			// TODO: use PEAR here
402			function _saveProxy() {
403
404			// FIXME!
405			if (!$this->meta[cache][db]) { return; }
406
407			logp(get_class($this) . "->_saveProxy()");
408			connectdb();
409			if ($this->payload) {
410			//$sql = "INSERT INTO f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'";
411			$sql = "INSERT INTO f_proxy SET oid='$this->objectId', payload='$this->payload'";
412			if (!send_sql($sql)) {
413			$sql = "UPDATE f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'";
414			send_sql($sql);
415			}
416			}
417			}
418
419			function _loadRemote() {
420			logp(get_class($this) . "->_loadRemote()");
421
422			// trace
423			//print Dumper($this->meta);
424
425			// TODO: test backend for reachability first (eventually cache this information and "reset" it by another party)
426
427			// 1. check backend-handle
428			if (!$this->backend) {
429			logp(get_class($this) . "->_loadRemote: no backend handle, please check argument 'rpcinfo'", PEAR_LOG_CRIT);
430			return;
431			}
432
433			// determine backend action by metadata
434			// check for guid or oid
435			if ($this->meta[guid]) {
436			if (!$this->objectId) {
437			logp(get_class($this) . "->_loadRemote: argument 'guid' requires valid objectId", PEAR_LOG_WARNING);
438			return;
439			}
440			if (!$this->meta[classname]) {
441			logp(get_class($this) . "->_loadRemote: argument 'guid' requires 'classname'", PEAR_LOG_WARNING);
442			return;
443			}
444			$args = array( guid => $this->objectId, classname => $this->meta[classname] );
445			$result = $this->backend->send('getObjectByGuid', $args );
446
447			} elseif ($this->meta[oid]) {
448			if (!$this->objectId) {
449			logp(get_class($this) . "->_loadRemote: argument 'oid' requires valid objectId", PEAR_LOG_WARNING);
450			return;
451			}
452			$result = $this->backend->send('getObject', $this->objectId);
453
454			} elseif ($this->meta[key]) {
455			if (!$this->meta[command]) {
456			logp(get_class($this) . "->_loadRemote: argument 'key' requires 'command'", PEAR_LOG_WARNING);
457			return;
458			}
459			/*
460			if (!$this->meta[query]) {
461			logp(get_class($this) . "->_loadRemote: argument 'key' requires 'query'", PEAR_LOG_WARNING);
462			return;
463			}
464			*/
465			$result = $this->backend->send($this->meta[command], $this->meta[query]);
466
467			}
468
469
470
471			if ($result) {
472			//print "result: " . dumpVar($result) . "<br>";
473			if (count($result) == 0) { return; }
474
475			// FIXME: this is dangerous!
476			if ($_GET[debug]) {
477			print Dumper($result);
478			}
479
480			$this->payload = serialize($result);
481			// ----- move this to _encode some times
482
483			$this->_saveProxy();
484			//print "oid: $this->objectId<br>";
485			$this->flushState();
486			} else {
487			//print "Error in _loadRemote!!!<br>";
488			logp(get_class($this) . "->_loadRemote: error while trying to talk to remote side", PEAR_LOG_CRIT);
489			}
490
491			}
492
493			function _saveBackend($result) {
494			logp(get_class($this) . "->_saveBackend()");
495
496			//$encoder = new TextEncode($result);
497			//$encoder->toUTF8();
498
499			// check for guid or oid
500			if($this->meta[guid]) {
501			$args = array( 'guid' => $this->objectId, 'classname' => $this->meta[classname], 'data' => $result );
502			$response = $this->backend->send('saveObjectByGuid', $args, array( utf8 => 1) );
503			}
504			if($this->meta[oid]) {
505			$response = $this->backend->send('saveObject', array('oid' => $this->objectId, 'data' => $result), array( utf8 => 1) );
506			}
507			}
508
509			function _decode() {
510			// fill attributes-hashtable from message-hashtable
511			if (!$this->payload) { return; }
512			//if ($this->attributes = $backend->decodeData($this->payload)) {
513			if ($this->attributes = unserialize($this->payload)) {
514			$this->meta[decoded] = 1;
515			}
516			}
517
518			function store($struct) {
519			$this->payload = serialize($struct);
520			$this->_saveProxy();
521			}
522
523			}
524
525			?>
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