/[cvs]/nfo/php/libs/org.netfrag.glib/DesignPattern/RemoteProxy.php
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revision 1.1 by joko, Mon Mar 3 22:06:46 2003 UTC revision 1.14 by joko, Wed Apr 9 02:06:45 2003 UTC
# Line 1  Line 1 
1  <?php  <?php
2    /**
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     *
9     *
10     */
11    
12    
13  /**  /**
14     * <b>Cvs-Log:</b>
15     *
16     * <pre>
17   * -------------------------------------------------------------------------   * -------------------------------------------------------------------------
18   *    $Id$   *    $Id$
19   * -------------------------------------------------------------------------   * -------------------------------------------------------------------------
20   *    $Log$   *    $Log$
21     *    Revision 1.14  2003/04/09 02:06:45  joko
22     *    errormessage now shown preformatted
23     *
24     *    Revision 1.13  2003/04/04 17:38:03  joko
25     *    modifications regarding error-/exception-handling and -tracing
26     *
27     *    Revision 1.12  2003/03/29 08:01:21  joko
28     *    modified ErrorBoxing
29     *
30     *    Revision 1.11  2003/03/28 06:44:51  joko
31     *    VERBOSE mode
32     *
33     *    Revision 1.10  2003/03/28 03:05:54  joko
34     *    more fancy debugging-output
35     *
36     *    Revision 1.9  2003/03/10 23:05:25  joko
37     *    + fixed metadata for phpDocumentor
38     *
39     *    Revision 1.8  2003/03/10 22:31:56  joko
40     *    + fixed metadata for phpDocumentor
41     *
42     *    Revision 1.7  2003/03/09 15:51:44  joko
43     *    + additional metadata for Autodia
44     *
45     *    Revision 1.6  2003/03/05 17:28:43  joko
46     *    updated docu (phpDocumentor testing....)
47     *
48     *    Revision 1.5  2003/03/05 17:02:22  joko
49     *    updated docu (phpDocumentor testing....)
50     *
51     *    Revision 1.4  2003/03/05 16:32:19  joko
52     *    updated docu (phpDocumentor testing....)
53     *
54     *    Revision 1.3  2003/03/05 16:10:17  joko
55     *    updated docu (phpDocumentor testing....)
56     *
57     *    Revision 1.2  2003/03/05 12:14:02  joko
58     *    renamed method
59     *    constructor argument expansion
60     *
61   *    Revision 1.1  2003/03/03 22:06:46  joko   *    Revision 1.1  2003/03/03 22:06:46  joko
62   *    refactored from Data::Driver::Proxy   *    refactored from Data::Driver::Proxy
63   *   *
# Line 92  Line 145 
145   *    Revision 1.1  2002/10/09 00:51:39  cvsjoko   *    Revision 1.1  2002/10/09 00:51:39  cvsjoko
146   *    + new   *    + new
147   * -------------------------------------------------------------------------   * -------------------------------------------------------------------------
148     * </pre>
149     *
150   */   */
151    
152    
153    
154    
155  /**  /**
156     * Load required modules:
157   *   *
158   * Data::Driver::Proxy  --  Multiple stage data fetching and caching   */
159    loadModule('DesignPattern::Proxy');
160    
161    
162    /**
163     * DesignPattern::RemoteProxy  --  Multiple stage data fetching and caching
164   *   *
165   *   *
166   * This class (Data::Driver::Proxy) provides an abstract framework   * This class (DesignPattern::RemoteProxy) provides an abstract framework
167   * for loading/saving arbitrary data from/to data storages interfaced   * for loading/saving arbitrary data from/to data storages interfaced
168   * by storage *proxy*-drivers.   * by storage *proxy*-drivers.
169   * Don't mix these up with the concrete storage *handle*-drivers   * Don't mix these up with the concrete storage *handle*-drivers
# Line 108  Line 172 
172   * providing a more highlevel, consistent API making   * providing a more highlevel, consistent API making
173   * it easier for Data::Driver::Proxy to do its main work:   * it easier for Data::Driver::Proxy to do its main work:
174   *   *
175     * quote from: http://home.earthlink.net/~huston2/dp/proxy.html
176     * "A remote proxy provides a local representative for an
177     * object that resides in a different address space. This is
178     * what the "stub" code in RPC and CORBA provides."
179     *
180     *
181   * Multiple stage data fetching and caching:   * Multiple stage data fetching and caching:
182   *   *
183     * <pre>
184     *
185   * DATA, ...   * DATA, ...
186   *    ... also refered to as data, should be handled as   *    ... also refered to as data, should be handled as
187   *    something called data.   *    something called data.
# Line 152  Line 224 
224   *    o Data::Driver::PEAR::DB   *    o Data::Driver::PEAR::DB
225   *    x Data::Driver::PEAR::Tree (via Data::Lift)   *    x Data::Driver::PEAR::Tree (via Data::Lift)
226   *   *
227   */   * </pre>
   
 /**  
  * 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?  
228   *   *
229   */   *
230     * An attempt to implement some software design patterns
231  /**   * --- RemoteProxyPattern
232   * Load required modules:   *
233     * @link http://www.agcs.com/supportv2/techpapers/patterns/papers/tutnotes/sld017.htm
234     * @link http://home.earthlink.net/~huston2/dp/proxy.html
235     * @link http://wiki.cs.uiuc.edu/PatternStories/RemoteObject
236     * @link http://c2.com/cgi-bin/wiki?ProxyPattern
237     * @link http://c2.com/cgi-bin/wiki?LazyProxies
238     *
239     * @author Andreas Motl <andreas.motl@ilo.de>
240     * @link http://www.netfrag.org/~joko/
241     *
242     * @copyright (c) 2003 - All Rights reserved.
243     * @license GNU LGPL (GNU Lesser General Public License)
244     * @link http://www.gnu.org/licenses/lgpl.txt
245     *
246     * @package org.netfrag.glib
247     * @subpackage DesignPattern
248     * @name DesignPattern::RemoteProxy
249     *
250     *
251     * @todo extend options to en-/disable caching via a) session and/or b) database
252     *           make feature available via runtime setter-method to these options
253     * @todo PEAR::Cache for caching purposes!!!
254     * @todo refactor database access: use PEAR for this! no more 'connectdb' here!!!
255     * @todo make database connection more flexible to make possible
256     *           to have different (probably named) proxy databases (besides a "main database")
257     * @todo rename this to Data::Proxy? or split into Data::Query, Data::Result and Data::Wrapper?
258     * @todo refactor this to a "RemoteObject" class!!! (inheriting from DesignPattern::RemoteObject)
259     * @todo rename this to "DesignPattern::LazyRemoteProxy"???
260   *   *
261   */   */
 loadModule('DesignPattern::Proxy');  
   
262  class DesignPattern_RemoteProxy extends DesignPattern_Proxy {  class DesignPattern_RemoteProxy extends DesignPattern_Proxy {
263    
264    var $objectId;    var $objectId;
# Line 185  class DesignPattern_RemoteProxy extends Line 272  class DesignPattern_RemoteProxy extends
272      logp(get_class($this) . "->new()", PEAR_LOG_INFO);      logp(get_class($this) . "->new()", PEAR_LOG_INFO);
273      global $proxy;      global $proxy;
274    
275        // 2003-03-05 - modified constructor
276        // expand objectId
277        if (is_array($objectId)) {
278          $options = $objectId[1];
279          $objectId = $objectId[0];
280        }
281    
282      // trace      // trace
283        //print Dumper($objectId, $options);        //print Dumper($objectId, $options);
284    
# Line 193  class DesignPattern_RemoteProxy extends Line 287  class DesignPattern_RemoteProxy extends
287        $this->_init_caching();        $this->_init_caching();
288        $this->_init_load();        $this->_init_load();
289    
290        //print Dumper($this);
291    
292    }    }
293    
294    function _init_meta_options( $objectId="", $options = array() ) {    function _init_meta_options( $objectId="", $options = array() ) {
# Line 215  class DesignPattern_RemoteProxy extends Line 311  class DesignPattern_RemoteProxy extends
311        session_register_safe("proxy");        session_register_safe("proxy");
312      }        }  
313    
314        /**
315         * <!-- Autodia -->
316         * can do: (this is metadata supplied for Autodia, don't delete!)
317         *  $this->backend = new DataSource_Proxy_XMLRPC()
318         *
319         */
320    
321      if ($this->meta[remote]) {      if ($this->meta[remote]) {
322        //$this->backend = mkObject('Data::Driver::RPC::Remote', $this->meta[rpcinfo]);        //$this->backend = mkObject('Data::Driver::RPC::Remote', $this->meta[rpcinfo]);
323        $this->backend = mkObject('DataSource::Proxy::XMLRPC', $this->meta[rpcinfo]);        $this->backend = php::mkComponent('DataSource::Proxy::XMLRPC', $this->meta[rpcinfo]);
324      }      }
325    }    }
326    
# Line 275  class DesignPattern_RemoteProxy extends Line 378  class DesignPattern_RemoteProxy extends
378    }      }  
379    */    */
380    
381    function getAttributes() {    function getResult() {
382      if (!$this->meta[decoded]) {      if (!$this->meta[decoded]) {
383        $this->_decode();        $this->_decode();
384        $this->_saveState();        $this->_saveState();
# Line 388  class DesignPattern_RemoteProxy extends Line 491  class DesignPattern_RemoteProxy extends
491            logp(get_class($this) . "->_loadRemote: argument 'guid' requires 'classname'", PEAR_LOG_WARNING);            logp(get_class($this) . "->_loadRemote: argument 'guid' requires 'classname'", PEAR_LOG_WARNING);
492            return;            return;
493          }          }
494            logp(get_class($this) . "->_loadRemote: getObjectByGuid", PEAR_LOG_DEBUG);
495          $args = array( guid => $this->objectId, classname => $this->meta[classname] );          $args = array( guid => $this->objectId, classname => $this->meta[classname] );
496          $result = $this->backend->send('getObjectByGuid', $args );          $result = $this->backend->send('getObjectByGuid', $args );
497    
# Line 396  class DesignPattern_RemoteProxy extends Line 500  class DesignPattern_RemoteProxy extends
500            logp(get_class($this) . "->_loadRemote: argument 'oid' requires valid objectId", PEAR_LOG_WARNING);            logp(get_class($this) . "->_loadRemote: argument 'oid' requires valid objectId", PEAR_LOG_WARNING);
501            return;            return;
502          }          }
503            logp(get_class($this) . "->_loadRemote: getObject", PEAR_LOG_DEBUG);
504          $result = $this->backend->send('getObject', $this->objectId);          $result = $this->backend->send('getObject', $this->objectId);
505    
506        } elseif ($this->meta[key]) {        } elseif ($this->meta[key]) {
# Line 409  class DesignPattern_RemoteProxy extends Line 514  class DesignPattern_RemoteProxy extends
514            return;            return;
515          }          }
516          */          */
517            //logp(get_class($this) . "->_loadRemote: $this->meta[command](" . join(' ', $this->meta[query]) . ")", PEAR_LOG_DEBUG);
518            //print Dumper(array($this->meta[command], $this->meta[query]));
519          $result = $this->backend->send($this->meta[command], $this->meta[query]);          $result = $this->backend->send($this->meta[command], $this->meta[query]);
520                    
521        }        }
522    
523        //print "result: " . dumpVar($result) . "<br>";
524    
525        $status = $this->backend->status();
526        //print Dumper($status);
527            
528      if ($result) {      $good = is_array($result) && sizeof($result) && $status[connected];
529        //print "result: " . dumpVar($result) . "<br>";  
530        if (count($result) == 0) { return; }      if ($good) {
531                
532        // FIXME: this is dangerous!        // FIXME: this is dangerous!
533          /*
534        if ($_GET[debug]) {        if ($_GET[debug]) {
535          print Dumper($result);          print Dumper($result);
536        }        }
537          */
538                
539        $this->payload = serialize($result);        $this->payload = serialize($result);
540        // ----- move this to _encode some times        // ----- move this to _encode some times
# Line 430  class DesignPattern_RemoteProxy extends Line 542  class DesignPattern_RemoteProxy extends
542        $this->_saveProxy();        $this->_saveProxy();
543        //print "oid: $this->objectId<br>";        //print "oid: $this->objectId<br>";
544        $this->flushState();        $this->flushState();
545        
546      } else {      } else {
547        //print "Error in _loadRemote!!!<br>";        
548        logp(get_class($this) . "->_loadRemote: error while trying to talk to remote side", PEAR_LOG_CRIT);        if (constants::get('APP_MODE_DEBUG')) {
549            $this->draw_error_box($status);
550          } else {
551            php::maintenance('rpc', array( status => $status ) );
552          }
553        
554      }      }
555            
556    }    }
557    
558    function draw_error_box($status) {
559      $style = html_style("text/css", '.boxlabel_yellow { color: yellow; font-weight:bold; }');
560      $statusbox = html_div();
561      $statusbox->set_style('background: red; border: 2px black groove; width:640px; padding:10px; margin:40px;');
562      $statusbox->add( html_span('boxlabel_yellow', "Method:"), get_class($this) . "->_loadRemote", html_br() );
563      $statusbox->add( html_span('boxlabel_yellow', "Connected:"), $status[connected], html_br() );
564      $statusbox->add( html_span('boxlabel_yellow', "RPCSESSID:"), $status[RPCSESSID], html_br() );
565      foreach ($status[errors] as $error) {
566        $msg = html_pre($error[message]);
567        $statusbox->add( html_span('boxlabel_yellow', "Error($error[code]):"), $msg );
568      }
569        
570      $message = "Error while talking to remote side. Please check wire, socket or api.";
571      logp($message, PEAR_LOG_CRIT);
572      $statusbox->add( html_span('boxlabel_yellow', "Critical:"), $message, html_br() );
573    
574      // V1
575      /*
576      if (constants::get('VERBOSE') || constants::get('ERRORS_ONLY')) {
577        print $style->render();
578        print $statusbox->render();
579      } else {
580        foreach ($status[errors] as $error) {
581          print Dumper($error);
582        }
583      }
584      */
585    
586      // V2
587      trace( container($style, $statusbox) );
588    
589    }  
590    
591    
592    function _saveBackend($result) {    function _saveBackend($result) {
593      logp(get_class($this) . "->_saveBackend()");      logp(get_class($this) . "->_saveBackend()");
594    
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