/[cvs]/nfo/php/libs/org.netfrag.glib/DataSource/Generic.php
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revision 1.1 by joko, Wed Mar 5 12:04:00 2003 UTC revision 1.7 by joko, Tue Mar 11 01:43:00 2003 UTC
# Line 1  Line 1 
1  <?php  <?php
2  /**  /**
3   * This file contains the GenericDataSource child class   * This file contains the GenericDataSource child class
  * that may use arbitrary code modules as database handlers.  
  * It's aims are to get together:  
  *   o phpHtmlLibs "source-handlers"  
  *   o PEAR's database handlers  
  *   o custom ones (e.g. Data::Driver::Proxy object, which talks to a remote rpc server)  
4   *   *
5   * @author Andreas Motl <andreas.motl@ilo.de>   * @author Andreas Motl <andreas.motl@ilo.de>
6   * @package phpHtmlLib   * @package org.netfrag.glib
7   * @module GenericDataSource   * @name DataSource::Generic
8   *   *
9   */   */
10    
11  /**  /**
12     * <b>Cvs-Log:</b>
13     *
14     * <pre>
15   * $Id$   * $Id$
16   *   *
17   * $Log$   * $Log$
18     * Revision 1.7  2003/03/11 01:43:00  joko
19     * + fixed metadata for phpDocumentor
20     *
21     * Revision 1.6  2003/03/11 01:22:25  joko
22     * + fixed metadata for phpDocumentor
23     *
24     * Revision 1.5  2003/03/11 00:12:49  joko
25     * + fixed metadata for phpDocumentor
26     *
27     * Revision 1.4  2003/03/10 23:25:03  joko
28     * + fixed metadata for phpDocumentor
29     *
30     * Revision 1.3  2003/03/09 15:50:36  joko
31     * + additional metadata for Autodia
32     *
33     * Revision 1.2  2003/03/05 17:28:43  joko
34     * updated docu (phpDocumentor testing....)
35     *
36   * Revision 1.1  2003/03/05 12:04:00  joko   * Revision 1.1  2003/03/05 12:04:00  joko
37   * + initial commit, from GenericDataSource   * + initial commit, from GenericDataSource
38   *   *
# Line 43  Line 59 
59   *   *
60   * Revision 1.1  2003/03/01 03:10:40  joko   * Revision 1.1  2003/03/01 03:10:40  joko
61   * + initial commit   * + initial commit
62   *   * </pre>
63   *   *
64   */   */
65    
# Line 71  Line 87 
87    // require_once("PEAR.php");   // FIXME: what about PEAR::XML::RPC?    // require_once("PEAR.php");   // FIXME: what about PEAR::XML::RPC?
88    // require_once("DB.php");    // require_once("DB.php");
89    
90    
91    loadModule('DesignPattern::Proxy');
92    loadModule('DesignPattern::TransparentProxy');
93    loadModule('DesignPattern::RemoteProxy');
94    
95    //class GenericDataSource extends MemoryDataSource {
96    //class GenericDataSource extends DesignPattern_Proxy {
97    //class GenericDataSource extends DesignPattern_RemoteProxy {
98    //class GenericDataSource extends DesignPattern_TransparentProxy {
99    
100    //class GenericDataSource extends MemoryDataSource {
101    //loadModule("DataSource::Proxy::Memory");
102    //class GenericDataSource extends DataSource_Proxy_Memory {
103    //class DataSource_GenericDataSource extends DataSource_Proxy_Memory {
104    //class DataSource_GenericDataSource extends DesignPattern_Proxy {
105    //class DataSource_GenericDataSource extends DataSource_Proxy_Memory {
106    
107    // now independent!!! new class-inheritance-tree possible now!
108    // solved by having an Adapter *and* a Proxy here!
109    //class GenericDataSource {
110    
111    loadModule('DesignPattern::AdapterProxy');
112    
113    
114    
115  /**  /**
116   * This GenericDataSource child class is *completely* independent   * This GenericDataSource child class is *completely* independent
117   * of a specific storage implementation and intended to be a wrapper   * of a specific storage implementation and intended to be a wrapper
118   * class on the way from phpHtmlLib to Xyz.   * class on the way from phpHtmlLib to Xyz. <br>
119   *    ("Yyz" gets represented by Data::Storage by now.....)   *    ("Yyz" gets represented by Data::Storage by now.....)
120   *   *
121   * GenericDataSource interacts with an intermediate "proxy" object   * GenericDataSource interacts with an intermediate "proxy" object
122   * (e.g. Data::Driver::Proxy) when doing queries.   * (e.g. Data::Driver::Proxy) when doing queries. <br>
123     * <pre>
124   *    Don't mix this up with a persistent database handle which gets   *    Don't mix this up with a persistent database handle which gets
125   *    reused each and every time for different queries.   *    reused each and every time for different queries.
126   *    Here *is* a new instance of Data::Driver::Proxy for *each* query.   *    Here *is* a new instance of Data::Driver::Proxy for *each* query.
127     * </pre>
128   *   *
129   * But the point is: Caching! The actual *data* isn't read redundant!   * But the point is: Caching! The actual *data* isn't read redundant!
130   *   *
131     * <pre>
132     * --- snipped into here from above ---
133     * that may use arbitrary code modules as database handlers.
134     * It's aims are to get together:
135     *   o phpHtmlLibs "source-handlers"
136     *   o PEAR's database handlers
137     *   o custom ones (e.g. Data::Driver::Proxy object, which talks to a remote rpc server)
138     * --- snipped into here from above ---
139     * </pre>
140   *   *
141     * <p>
142   * !!!!!!  refactor this to Data::Driver::Proxy  !!!!!!     <-----------------   * !!!!!!  refactor this to Data::Driver::Proxy  !!!!!!     <-----------------
143   *   *
144   * Data::Driver::Proxy instantiates "handlers" below itself   * Data::Driver::Proxy instantiates "handlers" below itself
# Line 95  Line 148 
148   * One worker already implemented is Data::Driver::RPC::Remote, which   * One worker already implemented is Data::Driver::RPC::Remote, which
149   * talks to a RPC::XML server (todo: talk SOAP!) using PEAR::XML::RPC.   * talks to a RPC::XML server (todo: talk SOAP!) using PEAR::XML::RPC.
150   *   *
151     * <pre>
152   * ---  refactored here, but: redundant somehow  ---   * ---  refactored here, but: redundant somehow  ---
153   * Data::Driver::Proxy uses a PEAR XML::RPC object to actually   * Data::Driver::Proxy uses a PEAR XML::RPC object to actually
154   * talk HTTP and serialize data chunks to and from XML,   * talk HTTP and serialize data chunks to and from XML,
# Line 102  Line 156 
156   * It "proxies" arbitrary data chunks a) inside a native php4 session,   * It "proxies" arbitrary data chunks a) inside a native php4 session,
157   * b) by talking to a rdbms (single proxy-table) or c) [TODO] using PEAR::Cache.   * b) by talking to a rdbms (single proxy-table) or c) [TODO] using PEAR::Cache.
158   * ---  refactored here, but: redundant somehow  ---   * ---  refactored here, but: redundant somehow  ---
159     * </pre>
160   *   *
161   * !!!!!!  refactor this to Data::Driver::Proxy  !!!!!!     <-----------------   * !!!!!!  refactor this to Data::Driver::Proxy  !!!!!!     <-----------------
162     * </p>
163   *   *
164   *   *
165   * How to use?   * <p>
166     * <b>How to use?</b>
167   *   *
168   * Pass an array holding "locator metadata" to the constructor.   * Pass an array holding "locator metadata" to the constructor.
169   * GenericDataSource takes care of the rest.   * GenericDataSource takes care of the rest.
170   *   *
171     * <pre>
172   * Pass an array to the constructor: (e.g.)   * Pass an array to the constructor: (e.g.)
173   *   *
174   *  1. doing rpc-calls....   *  1. doing rpc-calls....
175     *    <code>
176   *    $locator = array(   *    $locator = array(
177   *      type => 'rpc',   *      type => 'rpc',
178   *      metadata => array( Host => 'localhost', Port => '8765' ),   *      metadata => array( Host => 'localhost', Port => '8765' ),
179   *    );   *    );
180   *    $source = new GenericDataSource($locator);   *    $source = ne w GenericDataSource($locator);
181   *    $this->set_data_source( &$source );   *    $this->set_data_source( &$source );
182     *    </code>
183   *   *
184   *  2. [proposal] common datahandles....   *  2. [proposal] common datahandles....
185     *    <code>
186   *    $locator = array(   *    $locator = array(
187   *      type => 'mysql',   *      type => 'mysql',
188   *      dsn => 'known dsn markup',   *      dsn => 'known dsn markup',
189   *    );   *    );
190   *    $source = new GenericDataSource($locator);   *    $source = ne w GenericDataSource($locator);
191   *    $this->set_data_source( &$source );   *    $this->set_data_source( &$source );
192     *    </code>
193     * </pre>
194     * </p>
195     *
196   *   *
197     * @link http://www.netfrag.org/~joko/
198   * @author Andreas Motl <andreas.motl@ilo.de>   * @author Andreas Motl <andreas.motl@ilo.de>
199     *
200     * @link http://www.netfrag.org/~jonen/
201   * @author Sebastian Utz <seut@tunemedia.de>   * @author Sebastian Utz <seut@tunemedia.de>
202     *
203   * @copyright (c) 2003 - All Rights reserved.   * @copyright (c) 2003 - All Rights reserved.
  * @license GNU LGPL (GNU Lesser General Public License)  
204   *   *
205   * @author-url http://www.netfrag.org/~joko/   * @link http://www.gnu.org/licenses/lgpl.txt
206   * @author-url http://www.netfrag.org/~jonen/   * @license GNU LGPL (GNU Lesser General Public License)
  * @license-url http://www.gnu.org/licenses/lgpl.txt  
207   *   *
  * @package phpHtmlLib  
  * @module GenericDataSource  
208   *   *
209   */   * @package org.netfrag.glib
210     * @subpackage DataSource
211  /**   * @name DataSource::Generic
212   * Todo:   *
213     * @todo this:
214     * o mungle this to be able to be wrapped around phpHtmlLib's own storage-handles
215     * o implement another Data::Driver::Proxy container
216     *
217     * <pre>
218     *              !!!!!!!!          THIS IS THE PROBLEM          !!!!!!!!
219     *    !!!!!!!!   here is it where we have to break inheritance again   !!!!!!!!
220     *
221     *    THE CONFLICT: Beeing in phpHtmlLib *and* DesignPattern::TransparentProxy
222     *    inheritance trees at the same time, which is *not* possible at
223     *    declare-time. We *do* need some runtime-infrastructure to solve this!
224     *
225     *    TODO: move build- and check-locator stuff from ObjectList to this place!!!
226     *
227     *    ABOUT:
228     *      1. otherwhere: WebApp - scope:
229     *          x handles page vs. block vs. widget; dispatches MVC-View
230     *      2. here: DataSource - scope:
231     *          x handles bridge to frameworks (e.g. phpHtmlLib) vs. actual data driver libs (PEAR, etc.))
232     *          o clean implementation using a DesignPattern::AdapterProxy
233     * </pre>
234   *   *
  *  o mungle this to be able to be wrapped around phpHtmlLib's own storage-handles  
  *  o implement another Data::Driver::Proxy container  
235   *   *
236   */   */
   
   
 //              !!!!!!!!          THIS IS THE PROBLEM          !!!!!!!!  
 //    !!!!!!!!   here is it where we have to break inheritance again   !!!!!!!!  
 //  
 //    THE CONFLICT: Beeing in phpHtmlLib *and* DesignPattern::TransparentProxy  
 //    inheritance trees at the same time, which is *not* possible at  
 //    declare-time. We *do* need some runtime-infrastructure to solve this!  
 //  
 //    TODO: move build- and check-locator stuff from ObjectList to this place!!!  
 //  
 //    ABOUT:  
 //      1. otherwhere: WebApp - scope:  
 //          x handles page vs. block vs. widget; dispatches MVC-View  
 //      2. here: DataSource - scope:  
 //          x handles bridge to frameworks (e.g. phpHtmlLib) vs. actual data driver libs (PEAR, etc.))  
 //          o clean implementation using a DesignPattern::AdapterProxy  
 //  
   
 loadModule('DesignPattern::Proxy');  
 loadModule('DesignPattern::TransparentProxy');  
 loadModule('DesignPattern::RemoteProxy');  
   
 //class GenericDataSource extends MemoryDataSource {  
 //class GenericDataSource extends DesignPattern_Proxy {  
 //class GenericDataSource extends DesignPattern_RemoteProxy {  
 //class GenericDataSource extends DesignPattern_TransparentProxy {  
   
 //class GenericDataSource extends MemoryDataSource {  
 //loadModule("DataSource::Proxy::Memory");  
 //class GenericDataSource extends DataSource_Proxy_Memory {  
 //class DataSource_GenericDataSource extends DataSource_Proxy_Memory {  
 //class DataSource_GenericDataSource extends DesignPattern_Proxy {  
 //class DataSource_GenericDataSource extends DataSource_Proxy_Memory {  
   
 // now independent!!! new class-inheritance-tree possible now!  
 // solved by having an Adapter *and* a Proxy here!  
 //class GenericDataSource {  
   
 loadModule('DesignPattern::AdapterProxy');  
237  class DataSource_Generic extends DesignPattern_AdapterProxy {  class DataSource_Generic extends DesignPattern_AdapterProxy {
238    
239  //    !!!!!!!!   here is it where we have to break inheritance again   !!!!!!!!  //    !!!!!!!!   here is it where we have to break inheritance again   !!!!!!!!
# Line 305  class DataSource_Generic extends DesignP Line 349  class DataSource_Generic extends DesignP
349                  //$this->_locator->_datasource_type = $query[datasource];                  //$this->_locator->_datasource_type = $query[datasource];
350                  //$locator[_datasource_type] = $query[datasource];                  //$locator[_datasource_type] = $query[datasource];
351                                    
352          /**
353           * <!-- Autodia -->
354           * can do: (this is metadata supplied for Autodia, don't delete!)
355           *  $this->_locator = new DataSource_Locator()
356           *
357           */
358    
359                  // build master locator                  // build master locator
360                  $this->_locator = php::mkComponent('DataSource::Locator', $locator, array( datasource_type => $query[datasource] ) );                  $this->_locator = php::mkComponent('DataSource::Locator', $locator, array( datasource_type => $query[datasource] ) );
361                  //exit;                  //exit;
# Line 351  class DataSource_Generic extends DesignP Line 402  class DataSource_Generic extends DesignP
402  //exit;  //exit;
403    
404    
405        /**
406         * <!-- Autodia -->
407         * can do: (this is metadata supplied for Autodia, don't delete!)
408         *  $proxy = new DesignPattern_RemoteProxy()
409         *
410         */
411    
412    
413      // --- Proxy selector/dispatcher ...      // --- Proxy selector/dispatcher ...
414            
415      switch ($this->_locator->_datasource_type) {      switch ($this->_locator->_datasource_type) {
# Line 446  class DataSource_Generic extends DesignP Line 505  class DataSource_Generic extends DesignP
505        // $this->create_handler();        // $this->create_handler();
506    
507    
508          /**
509           * <!-- Autodia -->
510           * can do: (this is metadata supplied for Autodia, don't delete!)
511           *  $adapter = new DataSource_Adapter_phpHtmlLib_DataListSource()
512           *
513           */
514    
515        // V1:        // V1:
516        //$this->create_adapter($adapter_module, $this->function, $this->arguments);        //$this->create_adapter($adapter_module, $this->function, $this->arguments);
517    
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