Data/Driver/Proxy.php

<?php

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