/[cvs]/nfo/php/libs/org.netfrag.glib/DesignPattern/RemoteProxy.php
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revision 1.4 by joko, Wed Mar 5 16:32:19 2003 UTC revision 1.16 by jonen, Wed Jul 2 13:51:38 2003 UTC
# Line 5  Line 5 
5   * @author Andreas Motl <andreas.motl@ilo.de>   * @author Andreas Motl <andreas.motl@ilo.de>
6   * @package org.netfrag.glib   * @package org.netfrag.glib
7   * @name DesignPattern::RemoteProxy   * @name DesignPattern::RemoteProxy
  * @filesource  
8   *   *
9   *   *
10     */
11    
12    
13    /**
14   * <b>Cvs-Log:</b>   * <b>Cvs-Log:</b>
15   *   *
16   * <pre>   * <pre>
# Line 15  Line 18 
18   *    $Id$   *    $Id$
19   * -------------------------------------------------------------------------   * -------------------------------------------------------------------------
20   *    $Log$   *    $Log$
21     *    Revision 1.16  2003/07/02 13:51:38  jonen
22     *    removed debug dumper
23     *
24     *    Revision 1.15  2003/04/11 01:32:21  joko
25     *    renamed logging function
26     *
27     *    Revision 1.14  2003/04/09 02:06:45  joko
28     *    errormessage now shown preformatted
29     *
30     *    Revision 1.13  2003/04/04 17:38:03  joko
31     *    modifications regarding error-/exception-handling and -tracing
32     *
33     *    Revision 1.12  2003/03/29 08:01:21  joko
34     *    modified ErrorBoxing
35     *
36     *    Revision 1.11  2003/03/28 06:44:51  joko
37     *    VERBOSE mode
38     *
39     *    Revision 1.10  2003/03/28 03:05:54  joko
40     *    more fancy debugging-output
41     *
42     *    Revision 1.9  2003/03/10 23:05:25  joko
43     *    + fixed metadata for phpDocumentor
44     *
45     *    Revision 1.8  2003/03/10 22:31:56  joko
46     *    + fixed metadata for phpDocumentor
47     *
48     *    Revision 1.7  2003/03/09 15:51:44  joko
49     *    + additional metadata for Autodia
50     *
51     *    Revision 1.6  2003/03/05 17:28:43  joko
52     *    updated docu (phpDocumentor testing....)
53     *
54     *    Revision 1.5  2003/03/05 17:02:22  joko
55     *    updated docu (phpDocumentor testing....)
56     *
57   *    Revision 1.4  2003/03/05 16:32:19  joko   *    Revision 1.4  2003/03/05 16:32:19  joko
58   *    updated docu (phpDocumentor testing....)   *    updated docu (phpDocumentor testing....)
59   *   *
# Line 127  loadModule('DesignPattern::Proxy'); Line 166  loadModule('DesignPattern::Proxy');
166    
167    
168  /**  /**
169   * Data::Driver::Proxy  --  Multiple stage data fetching and caching   * DesignPattern::RemoteProxy  --  Multiple stage data fetching and caching
170   *   *
171   *   *
172   * This class (Data::Driver::Proxy) provides an abstract framework   * This class (DesignPattern::RemoteProxy) provides an abstract framework
173   * for loading/saving arbitrary data from/to data storages interfaced   * for loading/saving arbitrary data from/to data storages interfaced
174   * by storage *proxy*-drivers.   * by storage *proxy*-drivers.
175   * Don't mix these up with the concrete storage *handle*-drivers   * Don't mix these up with the concrete storage *handle*-drivers
# Line 139  loadModule('DesignPattern::Proxy'); Line 178  loadModule('DesignPattern::Proxy');
178   * providing a more highlevel, consistent API making   * providing a more highlevel, consistent API making
179   * it easier for Data::Driver::Proxy to do its main work:   * it easier for Data::Driver::Proxy to do its main work:
180   *   *
181     * quote from: http://home.earthlink.net/~huston2/dp/proxy.html
182     * "A remote proxy provides a local representative for an
183     * object that resides in a different address space. This is
184     * what the "stub" code in RPC and CORBA provides."
185     *
186     *
187   * Multiple stage data fetching and caching:   * Multiple stage data fetching and caching:
188   *   *
189   * <pre>   * <pre>
# Line 191  loadModule('DesignPattern::Proxy'); Line 236  loadModule('DesignPattern::Proxy');
236   * An attempt to implement some software design patterns   * An attempt to implement some software design patterns
237   * --- RemoteProxyPattern   * --- RemoteProxyPattern
238   *   *
239     * @link http://www.agcs.com/supportv2/techpapers/patterns/papers/tutnotes/sld017.htm
240     * @link http://home.earthlink.net/~huston2/dp/proxy.html
241     * @link http://wiki.cs.uiuc.edu/PatternStories/RemoteObject
242   * @link http://c2.com/cgi-bin/wiki?ProxyPattern   * @link http://c2.com/cgi-bin/wiki?ProxyPattern
243     * @link http://c2.com/cgi-bin/wiki?LazyProxies
244   *   *
245   * @author Andreas Motl <andreas.motl@ilo.de>   * @author Andreas Motl <andreas.motl@ilo.de>
246   * @link http://www.netfrag.org/~joko/   * @link http://www.netfrag.org/~joko/
# Line 201  loadModule('DesignPattern::Proxy'); Line 250  loadModule('DesignPattern::Proxy');
250   * @link http://www.gnu.org/licenses/lgpl.txt   * @link http://www.gnu.org/licenses/lgpl.txt
251   *   *
252   * @package org.netfrag.glib   * @package org.netfrag.glib
253     * @subpackage DesignPattern
254   * @name DesignPattern::RemoteProxy   * @name DesignPattern::RemoteProxy
255   *   *
256   *   *
257   * @todo   * @todo extend options to en-/disable caching via a) session and/or b) database
258   * <pre>   *           make feature available via runtime setter-method to these options
259   *  x extend options to en-/disable caching via a) session and/or b) database   * @todo PEAR::Cache for caching purposes!!!
260   *    o make feature available via runtime setter-method to these options   * @todo refactor database access: use PEAR for this! no more 'connectdb' here!!!
261   *  o use PEAR::Cache for caching purposes!!!   * @todo make database connection more flexible to make possible
262   *  o refactor database access: use PEAR for this! no more 'connectdb' here!!!   *           to have different (probably named) proxy databases (besides a "main database")
263   *  o make database connection more flexible to make possible   * @todo rename this to Data::Proxy? or split into Data::Query, Data::Result and Data::Wrapper?
264   *      to have different (probably named) proxy databases (besides a "main database")   * @todo refactor this to a "RemoteObject" class!!! (inheriting from DesignPattern::RemoteObject)
265   *  o rename this to Data::Proxy? or split into Data::Query, Data::Result and Data::Wrapper?   * @todo rename this to "DesignPattern::LazyRemoteProxy"???
  * </pre>  
266   *   *
267   */   */
268  class DesignPattern_RemoteProxy extends DesignPattern_Proxy {  class DesignPattern_RemoteProxy extends DesignPattern_Proxy {
# Line 226  class DesignPattern_RemoteProxy extends Line 275  class DesignPattern_RemoteProxy extends
275    var $backend;    var $backend;
276    
277    function DesignPattern_RemoteProxy($objectId = "", $options = array() ) {    function DesignPattern_RemoteProxy($objectId = "", $options = array() ) {
278      logp(get_class($this) . "->new()", PEAR_LOG_INFO);      php::log(get_class($this) . "->new()", PEAR_LOG_INFO);
279      global $proxy;      global $proxy;
280    
281      // 2003-03-05 - modified constructor      // 2003-03-05 - modified constructor
# Line 268  class DesignPattern_RemoteProxy extends Line 317  class DesignPattern_RemoteProxy extends
317        session_register_safe("proxy");        session_register_safe("proxy");
318      }        }  
319    
320        /**
321         * <!-- Autodia -->
322         * can do: (this is metadata supplied for Autodia, don't delete!)
323         *  $this->backend = new DataSource_Proxy_XMLRPC()
324         *
325         */
326    
327      if ($this->meta[remote]) {      if ($this->meta[remote]) {
328        //$this->backend = mkObject('Data::Driver::RPC::Remote', $this->meta[rpcinfo]);        //$this->backend = mkObject('Data::Driver::RPC::Remote', $this->meta[rpcinfo]);
329        $this->backend = php::mkComponent('DataSource::Proxy::XMLRPC', $this->meta[rpcinfo]);        $this->backend = php::mkComponent('DataSource::Proxy::XMLRPC', $this->meta[rpcinfo]);
# Line 283  class DesignPattern_RemoteProxy extends Line 339  class DesignPattern_RemoteProxy extends
339    
340    
341    function load() {    function load() {
342      logp(get_class($this) . "->load()", PEAR_LOG_INFO);      php::log(get_class($this) . "->load()", PEAR_LOG_INFO);
343      if (!$this->_loadState()) {      if (!$this->_loadState()) {
344        if (!$this->_loadProxy()) {        if (!$this->_loadProxy()) {
345    
# Line 359  class DesignPattern_RemoteProxy extends Line 415  class DesignPattern_RemoteProxy extends
415        //print Dumper($this);        //print Dumper($this);
416    
417      // debug      // debug
418        logp(get_class($this) . "->_loadState()");        php::log(get_class($this) . "->_loadState()");
419                
420      if ($this->attributes = $proxy[$this->objectId]) {      if ($this->attributes = $proxy[$this->objectId]) {
421        //print "_loadState:" . dumpVar($this->attributes);        //print "_loadState:" . dumpVar($this->attributes);
# Line 371  class DesignPattern_RemoteProxy extends Line 427  class DesignPattern_RemoteProxy extends
427    
428    function _saveState() {    function _saveState() {
429      global $proxy;      global $proxy;
430      logp(get_class($this) . "->_saveState()");      php::log(get_class($this) . "->_saveState()");
431      $proxy[$this->objectId] = $this->attributes;      $proxy[$this->objectId] = $this->attributes;
432      //print "_saveState: " . dumpVar($this->attributes);      //print "_saveState: " . dumpVar($this->attributes);
433      // TODO: throw exception-message back to user if operation fails      // TODO: throw exception-message back to user if operation fails
# Line 384  class DesignPattern_RemoteProxy extends Line 440  class DesignPattern_RemoteProxy extends
440            
441      // trace & debug      // trace & debug
442        //print Dumper($this);        //print Dumper($this);
443        logp(get_class($this) . "->_loadProxy()");        php::log(get_class($this) . "->_loadProxy()");
444                
445      connectdb();      connectdb();
446      $sql = "SELECT payload FROM f_proxy WHERE oid='$this->objectId'";      $sql = "SELECT payload FROM f_proxy WHERE oid='$this->objectId'";
# Line 404  class DesignPattern_RemoteProxy extends Line 460  class DesignPattern_RemoteProxy extends
460      // FIXME!      // FIXME!
461      if (!$this->meta[cache][db]) { return; }      if (!$this->meta[cache][db]) { return; }
462    
463      logp(get_class($this) . "->_saveProxy()");      php::log(get_class($this) . "->_saveProxy()");
464          connectdb();          connectdb();
465          if ($this->payload) {          if ($this->payload) {
466        //$sql = "INSERT INTO f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'";        //$sql = "INSERT INTO f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'";
# Line 417  class DesignPattern_RemoteProxy extends Line 473  class DesignPattern_RemoteProxy extends
473    }    }
474        
475    function _loadRemote() {    function _loadRemote() {
476      logp(get_class($this) . "->_loadRemote()");      php::log(get_class($this) . "->_loadRemote()");
477            
478      // trace      // trace
479        //print Dumper($this->meta);        //print Dumper($this->meta);
# Line 426  class DesignPattern_RemoteProxy extends Line 482  class DesignPattern_RemoteProxy extends
482            
483      // 1. check backend-handle      // 1. check backend-handle
484      if (!$this->backend) {      if (!$this->backend) {
485        logp(get_class($this) . "->_loadRemote: no backend handle, please check argument 'rpcinfo'", PEAR_LOG_CRIT);        php::log(get_class($this) . "->_loadRemote: no backend handle, please check argument 'rpcinfo'", PEAR_LOG_CRIT);
486        return;        return;
487      }      }
488            
# Line 434  class DesignPattern_RemoteProxy extends Line 490  class DesignPattern_RemoteProxy extends
490        // check for guid or oid        // check for guid or oid
491        if ($this->meta[guid]) {        if ($this->meta[guid]) {
492          if (!$this->objectId) {          if (!$this->objectId) {
493            logp(get_class($this) . "->_loadRemote: argument 'guid' requires valid objectId", PEAR_LOG_WARNING);            php::log(get_class($this) . "->_loadRemote: argument 'guid' requires valid objectId", PEAR_LOG_WARNING);
494            return;            return;
495          }          }
496          if (!$this->meta[classname]) {          if (!$this->meta[classname]) {
497            logp(get_class($this) . "->_loadRemote: argument 'guid' requires 'classname'", PEAR_LOG_WARNING);            php::log(get_class($this) . "->_loadRemote: argument 'guid' requires 'classname'", PEAR_LOG_WARNING);
498            return;            return;
499          }          }
500            php::log(get_class($this) . "->_loadRemote: getObjectByGuid", PEAR_LOG_DEBUG);
501          $args = array( guid => $this->objectId, classname => $this->meta[classname] );          $args = array( guid => $this->objectId, classname => $this->meta[classname] );
502          $result = $this->backend->send('getObjectByGuid', $args );          $result = $this->backend->send('getObjectByGuid', $args );
503    
504        } elseif ($this->meta[oid]) {        } elseif ($this->meta[oid]) {
505          if (!$this->objectId) {          if (!$this->objectId) {
506            logp(get_class($this) . "->_loadRemote: argument 'oid' requires valid objectId", PEAR_LOG_WARNING);            php::log(get_class($this) . "->_loadRemote: argument 'oid' requires valid objectId", PEAR_LOG_WARNING);
507            return;            return;
508          }          }
509            php::log(get_class($this) . "->_loadRemote: getObject", PEAR_LOG_DEBUG);
510          $result = $this->backend->send('getObject', $this->objectId);          $result = $this->backend->send('getObject', $this->objectId);
511    
512        } elseif ($this->meta[key]) {        } elseif ($this->meta[key]) {
513          if (!$this->meta[command]) {          if (!$this->meta[command]) {
514            logp(get_class($this) . "->_loadRemote: argument 'key' requires 'command'", PEAR_LOG_WARNING);            php::log(get_class($this) . "->_loadRemote: argument 'key' requires 'command'", PEAR_LOG_WARNING);
515            return;            return;
516          }          }
517          /*          /*
518          if (!$this->meta[query]) {          if (!$this->meta[query]) {
519            logp(get_class($this) . "->_loadRemote: argument 'key' requires 'query'", PEAR_LOG_WARNING);            php::log(get_class($this) . "->_loadRemote: argument 'key' requires 'query'", PEAR_LOG_WARNING);
520            return;            return;
521          }          }
522          */          */
523            //php::log(get_class($this) . "->_loadRemote: $this->meta[command](" . join(' ', $this->meta[query]) . ")", PEAR_LOG_DEBUG);
524            //print Dumper(array($this->meta[command], $this->meta[query]));
525          $result = $this->backend->send($this->meta[command], $this->meta[query]);          $result = $this->backend->send($this->meta[command], $this->meta[query]);
526                    
527        }        }
528    
529        //print "result: " . dumpVar($result) . "<br>";
530    
531        $status = $this->backend->status();
532        //print Dumper($status);
533            
534      if ($result) {      $good = is_array($result) && sizeof($result) && $status[connected];
535        //print "result: " . dumpVar($result) . "<br>";  
536        if (count($result) == 0) { return; }      if ($good) {
537                
538        // FIXME: this is dangerous!        // FIXME: this is dangerous!
539          /*
540        if ($_GET[debug]) {        if ($_GET[debug]) {
541          print Dumper($result);          print Dumper($result);
542        }        }
543          */
544                
545        $this->payload = serialize($result);        $this->payload = serialize($result);
546        // ----- move this to _encode some times        // ----- move this to _encode some times
# Line 483  class DesignPattern_RemoteProxy extends Line 548  class DesignPattern_RemoteProxy extends
548        $this->_saveProxy();        $this->_saveProxy();
549        //print "oid: $this->objectId<br>";        //print "oid: $this->objectId<br>";
550        $this->flushState();        $this->flushState();
551        
552      } else {      } else {
553        //print "Error in _loadRemote!!!<br>";        
554        logp(get_class($this) . "->_loadRemote: error while trying to talk to remote side", PEAR_LOG_CRIT);        if (constants::get('APP_MODE_DEBUG')) {
555            $this->draw_error_box($status);
556          } else {
557            php::maintenance('rpc', array( status => $status ) );
558          }
559        
560      }      }
561            
562    }    }
563    
564    function draw_error_box($status) {
565      $style = html_style("text/css", '.boxlabel_yellow { color: yellow; font-weight:bold; }');
566      $statusbox = html_div();
567      $statusbox->set_style('background: red; border: 2px black groove; width:640px; padding:10px; margin:40px;');
568      $statusbox->add( html_span('boxlabel_yellow', "Method:"), get_class($this) . "->_loadRemote", html_br() );
569      $statusbox->add( html_span('boxlabel_yellow', "Connected:"), $status[connected], html_br() );
570      $statusbox->add( html_span('boxlabel_yellow', "RPCSESSID:"), $status[RPCSESSID], html_br() );
571      foreach ($status[errors] as $error) {
572        $msg = html_pre($error[message]);
573        $statusbox->add( html_span('boxlabel_yellow', "Error($error[code]):"), $msg );
574      }
575        
576      $message = "Error while talking to remote side. Please check wire, socket or api.";
577      php::log($message, PEAR_LOG_CRIT);
578      $statusbox->add( html_span('boxlabel_yellow', "Critical:"), $message, html_br() );
579    
580      // V1
581      /*
582      if (constants::get('VERBOSE') || constants::get('ERRORS_ONLY')) {
583        print $style->render();
584        print $statusbox->render();
585      } else {
586        foreach ($status[errors] as $error) {
587          print Dumper($error);
588        }
589      }
590      */
591    
592      // V2
593      trace( container($style, $statusbox) );
594    
595    }  
596    
597    
598    function _saveBackend($result) {    function _saveBackend($result) {
599      logp(get_class($this) . "->_saveBackend()");      php::log(get_class($this) . "->_saveBackend()");
600    
601      //$encoder = new TextEncode($result);      //$encoder = new TextEncode($result);
602      //$encoder->toUTF8();      //$encoder->toUTF8();
# Line 522  class DesignPattern_RemoteProxy extends Line 627  class DesignPattern_RemoteProxy extends
627    
628  }  }
629    
 ?>  
630    ?>
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