Data/Driver/Proxy.php

<?php

/**
 * -------------------------------------------------------------------------
 *    $Id: Proxy.php,v 1.3 2003/03/01 04:56:38 joko Exp $
 * -------------------------------------------------------------------------
 *    $Log: Proxy.php,v $
 *    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
 * -------------------------------------------------------------------------
 */

/**
 *
 * 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:
 *
 * 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)
 *
 */

/**
 * Todo:
 *  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?
 *
 */


class Data_Driver_Proxy {

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

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

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

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

  }

  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]);
    }
  }

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