/[cvs]/nfo/php/libs/org.netfrag.glib/DesignPattern/RemoteProxy.php
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revision 1.3 by joko, Wed Mar 5 16:10:17 2003 UTC revision 1.15 by joko, Fri Apr 11 01:32:21 2003 UTC
# Line 6  Line 6 
6   * @package org.netfrag.glib   * @package org.netfrag.glib
7   * @name DesignPattern::RemoteProxy   * @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 1.15  2003/04/11 01:32:21  joko
22     *    renamed logging function
23     *
24     *    Revision 1.14  2003/04/09 02:06:45  joko
25     *    errormessage now shown preformatted
26     *
27     *    Revision 1.13  2003/04/04 17:38:03  joko
28     *    modifications regarding error-/exception-handling and -tracing
29     *
30     *    Revision 1.12  2003/03/29 08:01:21  joko
31     *    modified ErrorBoxing
32     *
33     *    Revision 1.11  2003/03/28 06:44:51  joko
34     *    VERBOSE mode
35     *
36     *    Revision 1.10  2003/03/28 03:05:54  joko
37     *    more fancy debugging-output
38     *
39     *    Revision 1.9  2003/03/10 23:05:25  joko
40     *    + fixed metadata for phpDocumentor
41     *
42     *    Revision 1.8  2003/03/10 22:31:56  joko
43     *    + fixed metadata for phpDocumentor
44     *
45     *    Revision 1.7  2003/03/09 15:51:44  joko
46     *    + additional metadata for Autodia
47     *
48     *    Revision 1.6  2003/03/05 17:28:43  joko
49     *    updated docu (phpDocumentor testing....)
50     *
51     *    Revision 1.5  2003/03/05 17:02:22  joko
52     *    updated docu (phpDocumentor testing....)
53     *
54     *    Revision 1.4  2003/03/05 16:32:19  joko
55     *    updated docu (phpDocumentor testing....)
56     *
57   *    Revision 1.3  2003/03/05 16:10:17  joko   *    Revision 1.3  2003/03/05 16:10:17  joko
58   *    updated docu (phpDocumentor testing....)   *    updated docu (phpDocumentor testing....)
59   *   *
# Line 107  Line 148 
148   *    Revision 1.1  2002/10/09 00:51:39  cvsjoko   *    Revision 1.1  2002/10/09 00:51:39  cvsjoko
149   *    + new   *    + new
150   * -------------------------------------------------------------------------   * -------------------------------------------------------------------------
151     * </pre>
152     *
153   */   */
154    
155    
156    
157    
158  /**  /**
159   * Data::Driver::Proxy  --  Multiple stage data fetching and caching   * Load required modules:
160     *
161     */
162    loadModule('DesignPattern::Proxy');
163    
164    
165    /**
166     * DesignPattern::RemoteProxy  --  Multiple stage data fetching and caching
167   *   *
168   *   *
169   * This class (Data::Driver::Proxy) provides an abstract framework   * This class (DesignPattern::RemoteProxy) provides an abstract framework
170   * for loading/saving arbitrary data from/to data storages interfaced   * for loading/saving arbitrary data from/to data storages interfaced
171   * by storage *proxy*-drivers.   * by storage *proxy*-drivers.
172   * Don't mix these up with the concrete storage *handle*-drivers   * Don't mix these up with the concrete storage *handle*-drivers
# Line 122  Line 175 
175   * providing a more highlevel, consistent API making   * providing a more highlevel, consistent API making
176   * it easier for Data::Driver::Proxy to do its main work:   * it easier for Data::Driver::Proxy to do its main work:
177   *   *
178     * quote from: http://home.earthlink.net/~huston2/dp/proxy.html
179     * "A remote proxy provides a local representative for an
180     * object that resides in a different address space. This is
181     * what the "stub" code in RPC and CORBA provides."
182     *
183     *
184   * Multiple stage data fetching and caching:   * Multiple stage data fetching and caching:
185   *   *
186     * <pre>
187     *
188   * DATA, ...   * DATA, ...
189   *    ... also refered to as data, should be handled as   *    ... also refered to as data, should be handled as
190   *    something called data.   *    something called data.
# Line 166  Line 227 
227   *    o Data::Driver::PEAR::DB   *    o Data::Driver::PEAR::DB
228   *    x Data::Driver::PEAR::Tree (via Data::Lift)   *    x Data::Driver::PEAR::Tree (via Data::Lift)
229   *   *
230   */   * </pre>
231     *
232  /**   *
233   * An attempt to implement some software design patterns...   * An attempt to implement some software design patterns
234   * --- RemoteProxyPattern   * --- RemoteProxyPattern
235   *   *
236     * @link http://www.agcs.com/supportv2/techpapers/patterns/papers/tutnotes/sld017.htm
237     * @link http://home.earthlink.net/~huston2/dp/proxy.html
238     * @link http://wiki.cs.uiuc.edu/PatternStories/RemoteObject
239   * @link http://c2.com/cgi-bin/wiki?ProxyPattern   * @link http://c2.com/cgi-bin/wiki?ProxyPattern
240     * @link http://c2.com/cgi-bin/wiki?LazyProxies
241   *   *
242   * @author Andreas Motl <andreas.motl@ilo.de>   * @author Andreas Motl <andreas.motl@ilo.de>
243   * @link http://www.netfrag.org/~joko/   * @link http://www.netfrag.org/~joko/
# Line 182  Line 247 
247   * @link http://www.gnu.org/licenses/lgpl.txt   * @link http://www.gnu.org/licenses/lgpl.txt
248   *   *
249   * @package org.netfrag.glib   * @package org.netfrag.glib
250     * @subpackage DesignPattern
251   * @name DesignPattern::RemoteProxy   * @name DesignPattern::RemoteProxy
252   *   *
  */  
   
 /**  
  * @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>  
253   *   *
254   */   * @todo extend options to en-/disable caching via a) session and/or b) database
255     *           make feature available via runtime setter-method to these options
256  /**   * @todo PEAR::Cache for caching purposes!!!
257   * Load required modules:   * @todo refactor database access: use PEAR for this! no more 'connectdb' here!!!
258     * @todo make database connection more flexible to make possible
259     *           to have different (probably named) proxy databases (besides a "main database")
260     * @todo rename this to Data::Proxy? or split into Data::Query, Data::Result and Data::Wrapper?
261     * @todo refactor this to a "RemoteObject" class!!! (inheriting from DesignPattern::RemoteObject)
262     * @todo rename this to "DesignPattern::LazyRemoteProxy"???
263   *   *
264   */   */
 loadModule('DesignPattern::Proxy');  
   
265  class DesignPattern_RemoteProxy extends DesignPattern_Proxy {  class DesignPattern_RemoteProxy extends DesignPattern_Proxy {
266    
267    var $objectId;    var $objectId;
# Line 216  class DesignPattern_RemoteProxy extends Line 272  class DesignPattern_RemoteProxy extends
272    var $backend;    var $backend;
273    
274    function DesignPattern_RemoteProxy($objectId = "", $options = array() ) {    function DesignPattern_RemoteProxy($objectId = "", $options = array() ) {
275      logp(get_class($this) . "->new()", PEAR_LOG_INFO);      php::log(get_class($this) . "->new()", PEAR_LOG_INFO);
276      global $proxy;      global $proxy;
277    
278      // 2003-03-05 - modified constructor      // 2003-03-05 - modified constructor
# Line 258  class DesignPattern_RemoteProxy extends Line 314  class DesignPattern_RemoteProxy extends
314        session_register_safe("proxy");        session_register_safe("proxy");
315      }        }  
316    
317        /**
318         * <!-- Autodia -->
319         * can do: (this is metadata supplied for Autodia, don't delete!)
320         *  $this->backend = new DataSource_Proxy_XMLRPC()
321         *
322         */
323    
324      if ($this->meta[remote]) {      if ($this->meta[remote]) {
325        //$this->backend = mkObject('Data::Driver::RPC::Remote', $this->meta[rpcinfo]);        //$this->backend = mkObject('Data::Driver::RPC::Remote', $this->meta[rpcinfo]);
326        $this->backend = php::mkComponent('DataSource::Proxy::XMLRPC', $this->meta[rpcinfo]);        $this->backend = php::mkComponent('DataSource::Proxy::XMLRPC', $this->meta[rpcinfo]);
# Line 273  class DesignPattern_RemoteProxy extends Line 336  class DesignPattern_RemoteProxy extends
336    
337    
338    function load() {    function load() {
339      logp(get_class($this) . "->load()", PEAR_LOG_INFO);      php::log(get_class($this) . "->load()", PEAR_LOG_INFO);
340      if (!$this->_loadState()) {      if (!$this->_loadState()) {
341        if (!$this->_loadProxy()) {        if (!$this->_loadProxy()) {
342    
# Line 349  class DesignPattern_RemoteProxy extends Line 412  class DesignPattern_RemoteProxy extends
412        //print Dumper($this);        //print Dumper($this);
413    
414      // debug      // debug
415        logp(get_class($this) . "->_loadState()");        php::log(get_class($this) . "->_loadState()");
416                
417      if ($this->attributes = $proxy[$this->objectId]) {      if ($this->attributes = $proxy[$this->objectId]) {
418        //print "_loadState:" . dumpVar($this->attributes);        //print "_loadState:" . dumpVar($this->attributes);
# Line 361  class DesignPattern_RemoteProxy extends Line 424  class DesignPattern_RemoteProxy extends
424    
425    function _saveState() {    function _saveState() {
426      global $proxy;      global $proxy;
427      logp(get_class($this) . "->_saveState()");      php::log(get_class($this) . "->_saveState()");
428      $proxy[$this->objectId] = $this->attributes;      $proxy[$this->objectId] = $this->attributes;
429      //print "_saveState: " . dumpVar($this->attributes);      //print "_saveState: " . dumpVar($this->attributes);
430      // TODO: throw exception-message back to user if operation fails      // TODO: throw exception-message back to user if operation fails
# Line 374  class DesignPattern_RemoteProxy extends Line 437  class DesignPattern_RemoteProxy extends
437            
438      // trace & debug      // trace & debug
439        //print Dumper($this);        //print Dumper($this);
440        logp(get_class($this) . "->_loadProxy()");        php::log(get_class($this) . "->_loadProxy()");
441                
442      connectdb();      connectdb();
443      $sql = "SELECT payload FROM f_proxy WHERE oid='$this->objectId'";      $sql = "SELECT payload FROM f_proxy WHERE oid='$this->objectId'";
# Line 394  class DesignPattern_RemoteProxy extends Line 457  class DesignPattern_RemoteProxy extends
457      // FIXME!      // FIXME!
458      if (!$this->meta[cache][db]) { return; }      if (!$this->meta[cache][db]) { return; }
459    
460      logp(get_class($this) . "->_saveProxy()");      php::log(get_class($this) . "->_saveProxy()");
461          connectdb();          connectdb();
462          if ($this->payload) {          if ($this->payload) {
463        //$sql = "INSERT INTO f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'";        //$sql = "INSERT INTO f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'";
# Line 407  class DesignPattern_RemoteProxy extends Line 470  class DesignPattern_RemoteProxy extends
470    }    }
471        
472    function _loadRemote() {    function _loadRemote() {
473      logp(get_class($this) . "->_loadRemote()");      php::log(get_class($this) . "->_loadRemote()");
474            
475      // trace      // trace
476        //print Dumper($this->meta);        //print Dumper($this->meta);
# Line 416  class DesignPattern_RemoteProxy extends Line 479  class DesignPattern_RemoteProxy extends
479            
480      // 1. check backend-handle      // 1. check backend-handle
481      if (!$this->backend) {      if (!$this->backend) {
482        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);
483        return;        return;
484      }      }
485            
# Line 424  class DesignPattern_RemoteProxy extends Line 487  class DesignPattern_RemoteProxy extends
487        // check for guid or oid        // check for guid or oid
488        if ($this->meta[guid]) {        if ($this->meta[guid]) {
489          if (!$this->objectId) {          if (!$this->objectId) {
490            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);
491            return;            return;
492          }          }
493          if (!$this->meta[classname]) {          if (!$this->meta[classname]) {
494            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);
495            return;            return;
496          }          }
497            php::log(get_class($this) . "->_loadRemote: getObjectByGuid", PEAR_LOG_DEBUG);
498          $args = array( guid => $this->objectId, classname => $this->meta[classname] );          $args = array( guid => $this->objectId, classname => $this->meta[classname] );
499          $result = $this->backend->send('getObjectByGuid', $args );          $result = $this->backend->send('getObjectByGuid', $args );
500    
501        } elseif ($this->meta[oid]) {        } elseif ($this->meta[oid]) {
502          if (!$this->objectId) {          if (!$this->objectId) {
503            logp(get_class($this) . "->_loadRemote: argument 'oid' requires valid objectId", PEAR_LOG_WARNING);            php::log(get_class($this) . "->_loadRemote: argument 'oid' requires valid objectId", PEAR_LOG_WARNING);
504            return;            return;
505          }          }
506            php::log(get_class($this) . "->_loadRemote: getObject", PEAR_LOG_DEBUG);
507          $result = $this->backend->send('getObject', $this->objectId);          $result = $this->backend->send('getObject', $this->objectId);
508    
509        } elseif ($this->meta[key]) {        } elseif ($this->meta[key]) {
510          if (!$this->meta[command]) {          if (!$this->meta[command]) {
511            logp(get_class($this) . "->_loadRemote: argument 'key' requires 'command'", PEAR_LOG_WARNING);            php::log(get_class($this) . "->_loadRemote: argument 'key' requires 'command'", PEAR_LOG_WARNING);
512            return;            return;
513          }          }
514          /*          /*
515          if (!$this->meta[query]) {          if (!$this->meta[query]) {
516            logp(get_class($this) . "->_loadRemote: argument 'key' requires 'query'", PEAR_LOG_WARNING);            php::log(get_class($this) . "->_loadRemote: argument 'key' requires 'query'", PEAR_LOG_WARNING);
517            return;            return;
518          }          }
519          */          */
520            //php::log(get_class($this) . "->_loadRemote: $this->meta[command](" . join(' ', $this->meta[query]) . ")", PEAR_LOG_DEBUG);
521            //print Dumper(array($this->meta[command], $this->meta[query]));
522          $result = $this->backend->send($this->meta[command], $this->meta[query]);          $result = $this->backend->send($this->meta[command], $this->meta[query]);
523                    
524        }        }
525    
526        //print "result: " . dumpVar($result) . "<br>";
527    
528        $status = $this->backend->status();
529        //print Dumper($status);
530            
531      if ($result) {      $good = is_array($result) && sizeof($result) && $status[connected];
532        //print "result: " . dumpVar($result) . "<br>";  
533        if (count($result) == 0) { return; }      if ($good) {
534                
535        // FIXME: this is dangerous!        // FIXME: this is dangerous!
536          /*
537        if ($_GET[debug]) {        if ($_GET[debug]) {
538          print Dumper($result);          print Dumper($result);
539        }        }
540          */
541                
542        $this->payload = serialize($result);        $this->payload = serialize($result);
543        // ----- move this to _encode some times        // ----- move this to _encode some times
# Line 473  class DesignPattern_RemoteProxy extends Line 545  class DesignPattern_RemoteProxy extends
545        $this->_saveProxy();        $this->_saveProxy();
546        //print "oid: $this->objectId<br>";        //print "oid: $this->objectId<br>";
547        $this->flushState();        $this->flushState();
548        
549      } else {      } else {
550        //print "Error in _loadRemote!!!<br>";        
551        logp(get_class($this) . "->_loadRemote: error while trying to talk to remote side", PEAR_LOG_CRIT);        if (constants::get('APP_MODE_DEBUG')) {
552            $this->draw_error_box($status);
553          } else {
554            php::maintenance('rpc', array( status => $status ) );
555          }
556        
557      }      }
558            
559    }    }
560    
561    function draw_error_box($status) {
562      $style = html_style("text/css", '.boxlabel_yellow { color: yellow; font-weight:bold; }');
563      $statusbox = html_div();
564      $statusbox->set_style('background: red; border: 2px black groove; width:640px; padding:10px; margin:40px;');
565      $statusbox->add( html_span('boxlabel_yellow', "Method:"), get_class($this) . "->_loadRemote", html_br() );
566      $statusbox->add( html_span('boxlabel_yellow', "Connected:"), $status[connected], html_br() );
567      $statusbox->add( html_span('boxlabel_yellow', "RPCSESSID:"), $status[RPCSESSID], html_br() );
568      foreach ($status[errors] as $error) {
569        $msg = html_pre($error[message]);
570        $statusbox->add( html_span('boxlabel_yellow', "Error($error[code]):"), $msg );
571      }
572        
573      $message = "Error while talking to remote side. Please check wire, socket or api.";
574      php::log($message, PEAR_LOG_CRIT);
575      $statusbox->add( html_span('boxlabel_yellow', "Critical:"), $message, html_br() );
576    
577      // V1
578      /*
579      if (constants::get('VERBOSE') || constants::get('ERRORS_ONLY')) {
580        print $style->render();
581        print $statusbox->render();
582      } else {
583        foreach ($status[errors] as $error) {
584          print Dumper($error);
585        }
586      }
587      */
588    
589      // V2
590      trace( container($style, $statusbox) );
591    
592    }  
593    
594    
595    function _saveBackend($result) {    function _saveBackend($result) {
596      logp(get_class($this) . "->_saveBackend()");      php::log(get_class($this) . "->_saveBackend()");
597    
598      //$encoder = new TextEncode($result);      //$encoder = new TextEncode($result);
599      //$encoder->toUTF8();      //$encoder->toUTF8();
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