/[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 1.5 by joko, Tue Mar 11 00:12:49 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    
# Line 17  Line 12 
12   * $Id$   * $Id$
13   *   *
14   * $Log$   * $Log$
15     * Revision 1.5  2003/03/11 00:12:49  joko
16     * + fixed metadata for phpDocumentor
17     *
18     * Revision 1.4  2003/03/10 23:25:03  joko
19     * + fixed metadata for phpDocumentor
20     *
21     * Revision 1.3  2003/03/09 15:50:36  joko
22     * + additional metadata for Autodia
23     *
24     * Revision 1.2  2003/03/05 17:28:43  joko
25     * updated docu (phpDocumentor testing....)
26     *
27   * Revision 1.1  2003/03/05 12:04:00  joko   * Revision 1.1  2003/03/05 12:04:00  joko
28   * + initial commit, from GenericDataSource   * + initial commit, from GenericDataSource
29   *   *
# Line 71  Line 78 
78    // require_once("PEAR.php");   // FIXME: what about PEAR::XML::RPC?    // require_once("PEAR.php");   // FIXME: what about PEAR::XML::RPC?
79    // require_once("DB.php");    // require_once("DB.php");
80    
81    
82    loadModule('DesignPattern::Proxy');
83    loadModule('DesignPattern::TransparentProxy');
84    loadModule('DesignPattern::RemoteProxy');
85    
86    //class GenericDataSource extends MemoryDataSource {
87    //class GenericDataSource extends DesignPattern_Proxy {
88    //class GenericDataSource extends DesignPattern_RemoteProxy {
89    //class GenericDataSource extends DesignPattern_TransparentProxy {
90    
91    //class GenericDataSource extends MemoryDataSource {
92    //loadModule("DataSource::Proxy::Memory");
93    //class GenericDataSource extends DataSource_Proxy_Memory {
94    //class DataSource_GenericDataSource extends DataSource_Proxy_Memory {
95    //class DataSource_GenericDataSource extends DesignPattern_Proxy {
96    //class DataSource_GenericDataSource extends DataSource_Proxy_Memory {
97    
98    // now independent!!! new class-inheritance-tree possible now!
99    // solved by having an Adapter *and* a Proxy here!
100    //class GenericDataSource {
101    
102    loadModule('DesignPattern::AdapterProxy');
103    
104    
105    
106  /**  /**
107   * This GenericDataSource child class is *completely* independent   * This GenericDataSource child class is *completely* independent
108   * of a specific storage implementation and intended to be a wrapper   * of a specific storage implementation and intended to be a wrapper
109   * class on the way from phpHtmlLib to Xyz.   * class on the way from phpHtmlLib to Xyz. <br>
110   *    ("Yyz" gets represented by Data::Storage by now.....)   *    ("Yyz" gets represented by Data::Storage by now.....)
111   *   *
112   * GenericDataSource interacts with an intermediate "proxy" object   * GenericDataSource interacts with an intermediate "proxy" object
113   * (e.g. Data::Driver::Proxy) when doing queries.   * (e.g. Data::Driver::Proxy) when doing queries. <br>
114     * <pre>
115   *    Don't mix this up with a persistent database handle which gets   *    Don't mix this up with a persistent database handle which gets
116   *    reused each and every time for different queries.   *    reused each and every time for different queries.
117   *    Here *is* a new instance of Data::Driver::Proxy for *each* query.   *    Here *is* a new instance of Data::Driver::Proxy for *each* query.
118     * </pre>
119   *   *
120   * But the point is: Caching! The actual *data* isn't read redundant!   * But the point is: Caching! The actual *data* isn't read redundant!
121   *   *
122     * <pre>
123     * --- snipped into here from above ---
124     * that may use arbitrary code modules as database handlers.
125     * It's aims are to get together:
126     *   o phpHtmlLibs "source-handlers"
127     *   o PEAR's database handlers
128     *   o custom ones (e.g. Data::Driver::Proxy object, which talks to a remote rpc server)
129     * --- snipped into here from above ---
130     * </pre>
131     *
132   *   *
133   * !!!!!!  refactor this to Data::Driver::Proxy  !!!!!!     <-----------------   * !!!!!!  refactor this to Data::Driver::Proxy  !!!!!!     <-----------------
134   *   *
# Line 95  Line 139 
139   * One worker already implemented is Data::Driver::RPC::Remote, which   * One worker already implemented is Data::Driver::RPC::Remote, which
140   * 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.
141   *   *
142     * <pre>
143   * ---  refactored here, but: redundant somehow  ---   * ---  refactored here, but: redundant somehow  ---
144   * Data::Driver::Proxy uses a PEAR XML::RPC object to actually   * Data::Driver::Proxy uses a PEAR XML::RPC object to actually
145   * talk HTTP and serialize data chunks to and from XML,   * talk HTTP and serialize data chunks to and from XML,
# Line 102  Line 147 
147   * It "proxies" arbitrary data chunks a) inside a native php4 session,   * It "proxies" arbitrary data chunks a) inside a native php4 session,
148   * 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.
149   * ---  refactored here, but: redundant somehow  ---   * ---  refactored here, but: redundant somehow  ---
150     * </pre>
151   *   *
152   * !!!!!!  refactor this to Data::Driver::Proxy  !!!!!!     <-----------------   * !!!!!!  refactor this to Data::Driver::Proxy  !!!!!!     <-----------------
153   *   *
154   *   *
155   * How to use?   * <b>How to use?</b>
156   *   *
157   * Pass an array holding "locator metadata" to the constructor.   * Pass an array holding "locator metadata" to the constructor.
158   * GenericDataSource takes care of the rest.   * GenericDataSource takes care of the rest.
# Line 114  Line 160 
160   * Pass an array to the constructor: (e.g.)   * Pass an array to the constructor: (e.g.)
161   *   *
162   *  1. doing rpc-calls....   *  1. doing rpc-calls....
163     *    <code>
164   *    $locator = array(   *    $locator = array(
165   *      type => 'rpc',   *      type => 'rpc',
166   *      metadata => array( Host => 'localhost', Port => '8765' ),   *      metadata => array( Host => 'localhost', Port => '8765' ),
167   *    );   *    );
168   *    $source = new GenericDataSource($locator);   *    $source = ne w GenericDataSource($locator);
169   *    $this->set_data_source( &$source );   *    $this->set_data_source( &$source );
170     *    </code>
171   *   *
172   *  2. [proposal] common datahandles....   *  2. [proposal] common datahandles....
173     *    <code>
174   *    $locator = array(   *    $locator = array(
175   *      type => 'mysql',   *      type => 'mysql',
176   *      dsn => 'known dsn markup',   *      dsn => 'known dsn markup',
177   *    );   *    );
178   *    $source = new GenericDataSource($locator);   *    $source = ne w GenericDataSource($locator);
179   *    $this->set_data_source( &$source );   *    $this->set_data_source( &$source );
180     *    </code>
181   *   *
182     * @link http://www.netfrag.org/~joko/
183   * @author Andreas Motl <andreas.motl@ilo.de>   * @author Andreas Motl <andreas.motl@ilo.de>
184     *
185     * @link http://www.netfrag.org/~jonen/
186   * @author Sebastian Utz <seut@tunemedia.de>   * @author Sebastian Utz <seut@tunemedia.de>
187     *
188   * @copyright (c) 2003 - All Rights reserved.   * @copyright (c) 2003 - All Rights reserved.
  * @license GNU LGPL (GNU Lesser General Public License)  
189   *   *
190   * @author-url http://www.netfrag.org/~joko/   * @link http://www.gnu.org/licenses/lgpl.txt
191   * @author-url http://www.netfrag.org/~jonen/   * @license GNU LGPL (GNU Lesser General Public License)
  * @license-url http://www.gnu.org/licenses/lgpl.txt  
192   *   *
  * @package phpHtmlLib  
  * @module GenericDataSource  
193   *   *
194   */   * @package org.netfrag.glib
195     * @subpackage DataSource
196  /**   * @name DataSource::Generic
197   * Todo:   *
198     * @todo this:
199     *
200     * o mungle this to be able to be wrapped around phpHtmlLib's own storage-handles
201     * o implement another Data::Driver::Proxy container
202     *
203     * <pre>
204     *              !!!!!!!!          THIS IS THE PROBLEM          !!!!!!!!
205     *    !!!!!!!!   here is it where we have to break inheritance again   !!!!!!!!
206     *
207     *    THE CONFLICT: Beeing in phpHtmlLib *and* DesignPattern::TransparentProxy
208     *    inheritance trees at the same time, which is *not* possible at
209     *    declare-time. We *do* need some runtime-infrastructure to solve this!
210     *
211     *    TODO: move build- and check-locator stuff from ObjectList to this place!!!
212     *
213     *    ABOUT:
214     *      1. otherwhere: WebApp - scope:
215     *          x handles page vs. block vs. widget; dispatches MVC-View
216     *      2. here: DataSource - scope:
217     *          x handles bridge to frameworks (e.g. phpHtmlLib) vs. actual data driver libs (PEAR, etc.))
218     *          o clean implementation using a DesignPattern::AdapterProxy
219     * </pre>
220   *   *
  *  o mungle this to be able to be wrapped around phpHtmlLib's own storage-handles  
  *  o implement another Data::Driver::Proxy container  
221   *   *
222   */   */
   
   
 //              !!!!!!!!          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');  
223  class DataSource_Generic extends DesignPattern_AdapterProxy {  class DataSource_Generic extends DesignPattern_AdapterProxy {
224    
225  //    !!!!!!!!   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 335  class DataSource_Generic extends DesignP
335                  //$this->_locator->_datasource_type = $query[datasource];                  //$this->_locator->_datasource_type = $query[datasource];
336                  //$locator[_datasource_type] = $query[datasource];                  //$locator[_datasource_type] = $query[datasource];
337                                    
338          /**
339           * <!-- Autodia -->
340           * can do: (this is metadata supplied for Autodia, don't delete!)
341           *  $this->_locator = new DataSource_Locator()
342           *
343           */
344    
345                  // build master locator                  // build master locator
346                  $this->_locator = php::mkComponent('DataSource::Locator', $locator, array( datasource_type => $query[datasource] ) );                  $this->_locator = php::mkComponent('DataSource::Locator', $locator, array( datasource_type => $query[datasource] ) );
347                  //exit;                  //exit;
# Line 351  class DataSource_Generic extends DesignP Line 388  class DataSource_Generic extends DesignP
388  //exit;  //exit;
389    
390    
391        /**
392         * <!-- Autodia -->
393         * can do: (this is metadata supplied for Autodia, don't delete!)
394         *  $proxy = new DesignPattern_RemoteProxy()
395         *
396         */
397    
398    
399      // --- Proxy selector/dispatcher ...      // --- Proxy selector/dispatcher ...
400            
401      switch ($this->_locator->_datasource_type) {      switch ($this->_locator->_datasource_type) {
# Line 446  class DataSource_Generic extends DesignP Line 491  class DataSource_Generic extends DesignP
491        // $this->create_handler();        // $this->create_handler();
492    
493    
494          /**
495           * <!-- Autodia -->
496           * can do: (this is metadata supplied for Autodia, don't delete!)
497           *  $adapter = new DataSource_Adapter_phpHtmlLib_DataListSource()
498           *
499           */
500    
501        // V1:        // V1:
502        //$this->create_adapter($adapter_module, $this->function, $this->arguments);        //$this->create_adapter($adapter_module, $this->function, $this->arguments);
503    
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