| 1 |
<?php |
| 2 |
/** |
| 3 |
* This file contains the DataSource::Locator class. |
| 4 |
* |
| 5 |
* It acts as a container for DataSource connection |
| 6 |
* metadata. Think of it as an enhanced dsn. |
| 7 |
* |
| 8 |
* It gets used by DataSource::Generic |
| 9 |
* to be informed about the most important stuff it |
| 10 |
* has to do. |
| 11 |
* |
| 12 |
* @author Andreas Motl <andreas.motl@ilo.de> |
| 13 |
* @package org.netfrag.glib |
| 14 |
* @name DataSource::Locator |
| 15 |
* |
| 16 |
* |
| 17 |
*/ |
| 18 |
|
| 19 |
|
| 20 |
/** |
| 21 |
* <b>Cvs-Log:</b> |
| 22 |
* |
| 23 |
* <pre> |
| 24 |
* $Id: Locator.php,v 1.9 2003/03/10 22:31:55 joko Exp $ |
| 25 |
* |
| 26 |
* $Log: Locator.php,v $ |
| 27 |
* Revision 1.9 2003/03/10 22:31:55 joko |
| 28 |
* + fixed metadata for phpDocumentor |
| 29 |
* |
| 30 |
* Revision 1.8 2003/03/09 15:50:36 joko |
| 31 |
* + additional metadata for Autodia |
| 32 |
* |
| 33 |
* Revision 1.7 2003/03/05 17:13:16 joko |
| 34 |
* updated docu (phpDocumentor testing....) |
| 35 |
* |
| 36 |
* Revision 1.6 2003/03/05 16:10:08 joko |
| 37 |
* updated docu (phpDocumentor testing....) |
| 38 |
* |
| 39 |
* Revision 1.5 2003/03/05 15:40:39 joko |
| 40 |
* updated docu (phpDocumentor testing....) |
| 41 |
* |
| 42 |
* Revision 1.4 2003/03/05 15:26:23 joko |
| 43 |
* updated docu (phpDocumentor testing....) |
| 44 |
* |
| 45 |
* Revision 1.3 2003/03/05 15:21:54 joko |
| 46 |
* updated docu (phpDocumentor testing....) |
| 47 |
* |
| 48 |
* Revision 1.2 2003/03/05 15:01:10 joko |
| 49 |
* updated docu |
| 50 |
* |
| 51 |
* Revision 1.1 2003/03/05 12:04:37 joko |
| 52 |
* + initial commit |
| 53 |
* </pre> |
| 54 |
* |
| 55 |
* |
| 56 |
*/ |
| 57 |
|
| 58 |
/** |
| 59 |
* It helps DataSource::Generic working in different "operation modes". |
| 60 |
* |
| 61 |
* <ul> |
| 62 |
* o Pass-Through-Reference: php Object will get passed through all layers |
| 63 |
* o Pass-Through-Memory: reference to a memory area will get used |
| 64 |
* x Build-Locator: build locator from datasource-type and adapter-type |
| 65 |
* o Use-Locator: directly use DataSource::Locator instance passed in |
| 66 |
* o Merge-Locators: merge metadata of two or more DataSource::Locator instances |
| 67 |
* o Build-AutoLocator: use global constants making up our metadata |
| 68 |
* <ul> |
| 69 |
* |
| 70 |
* |
| 71 |
* <b>It can/should contain:</b> |
| 72 |
* (flexible, just some parameters are required for each operation mode) |
| 73 |
* <ul> |
| 74 |
* o an oldschool "dsn"-string (e.g. for rdbms-connection via PEAR) |
| 75 |
* x name of a Proxy module to use to *wrap/hide* the connection/transport-layer |
| 76 |
* (e.g. DataSource::Proxy::XMLRPC via DesignPattern::RemoteProxy) |
| 77 |
* x metadata (a hash) directly describing *where* to connect to (e.g. 'Host', 'Port') |
| 78 |
* o an instance of an already instantiated arbitrary datasource handler (e.g. 'source') |
| 79 |
* this will get propagated (pass-through-mode) |
| 80 |
* o a datasource-type (of 'rpc|mysql|csv-file|xml-file') |
| 81 |
* this will be mapped to a module name and used as a *Proxy* |
| 82 |
* by the DataSource::Generic at runtime |
| 83 |
* x an adapter-type (of 'phpHtmlLib|pear') |
| 84 |
* this will be mapped to a module name and used as an *Adapter* |
| 85 |
* by the DataSource::Generic at runtime |
| 86 |
* o names of global constants where to find these informations |
| 87 |
* o datasource-type ('rpc|csv-file|...') <-> datasource-family ('orm|rdbms|odbms') |
| 88 |
* <ul> |
| 89 |
* |
| 90 |
* |
| 91 |
* <b>It can do</b> |
| 92 |
* - builds a larger locator from a minimum of information passed in via constructor-arguments |
| 93 |
* - direct fallback mode to some predefined constant names if locator is empty and above method fails |
| 94 |
* - direct fallback mode to some predefined values if just *everything* fails |
| 95 |
* |
| 96 |
* |
| 97 |
* <b>How to use?</b> |
| 98 |
* |
| 99 |
* Pass an array holding "locator metadata" to the constructor. |
| 100 |
* This module takes care of the rest. |
| 101 |
* |
| 102 |
* Pass an array to the constructor: (e.g.) |
| 103 |
* |
| 104 |
* 1. for doing rpc-calls.... |
| 105 |
* <code> |
| 106 |
* $locator = array( |
| 107 |
* datasource_type => 'rpc', |
| 108 |
* [adapter_type => 'phpHtmlLib',] |
| 109 |
* metadata => array( Host => 'localhost', Port => '8765' ), |
| 110 |
* ); |
| 111 |
* $source = ne w DataSource::Generic($locator); |
| 112 |
* $this->set_data_source( &$source ); |
| 113 |
* </code> |
| 114 |
* |
| 115 |
* 2. [proposal] for common/oldschool datahandles.... |
| 116 |
* <code> |
| 117 |
* $locator = array( |
| 118 |
* dsn => 'known dsn markup', |
| 119 |
* ); |
| 120 |
* $source = ne w DataSource::Generic($locator); |
| 121 |
* $this->set_data_source( &$source ); |
| 122 |
* </code> |
| 123 |
* |
| 124 |
* |
| 125 |
* |
| 126 |
* @author Andreas Motl <andreas.motl@ilo.de> |
| 127 |
* @link http://www.netfrag.org/~joko/ |
| 128 |
* @copyright (c) 2003 - All Rights reserved. |
| 129 |
* |
| 130 |
* @license GNU LGPL (GNU Lesser General Public License) |
| 131 |
* @link http://www.gnu.org/licenses/lgpl.txt |
| 132 |
* |
| 133 |
* @package org.netfrag.glib |
| 134 |
* @subpackage DataSource |
| 135 |
* @name DataSource::Locator |
| 136 |
* |
| 137 |
*/ |
| 138 |
class DataSource_Locator { |
| 139 |
|
| 140 |
/** |
| 141 |
* This var holds the locator metadata hash |
| 142 |
* which is built from some predefined rules |
| 143 |
* using metadata from $_options and some |
| 144 |
* other presets. |
| 145 |
* |
| 146 |
* @see function build, which acts as a dispatcher |
| 147 |
* depending on $_options[datasource]. |
| 148 |
* (main dispatching level) |
| 149 |
* |
| 150 |
* The structure of a full blown locator looks like this: |
| 151 |
* |
| 152 |
* <code> |
| 153 |
* $locator = array( |
| 154 |
* type => '<your type specifying the datasource-type>', |
| 155 |
* metadata => array( |
| 156 |
* ... your arbitrary deep metadata structure ... |
| 157 |
* ), |
| 158 |
* [dsn => '<your dsn markup>'], |
| 159 |
* ); |
| 160 |
* </code> |
| 161 |
* |
| 162 |
* Example 1 - data is inside a rdbms, using a dsn to connect to it: |
| 163 |
* <code> |
| 164 |
* $locator = array( |
| 165 |
* dsn => 'mysql://username:password@localhost/database', |
| 166 |
* ); |
| 167 |
* </code> |
| 168 |
* |
| 169 |
* Example 2 - data is inside an odbms, reachable by doing remote procedure calls (rpc): |
| 170 |
* <code> |
| 171 |
* $locator = array( |
| 172 |
* type => 'rpc', |
| 173 |
* metadata => array( |
| 174 |
* package => 'Data::Driver::Proxy', |
| 175 |
* Host => 'localhost', |
| 176 |
* Port => '8765', |
| 177 |
* ) |
| 178 |
* ); |
| 179 |
* </code> |
| 180 |
* |
| 181 |
* @deprecated |
| 182 |
* |
| 183 |
*/ |
| 184 |
var $_locator_metadata = NULL; |
| 185 |
|
| 186 |
|
| 187 |
/** |
| 188 |
* This var holds the arguments passed in to the constructor. |
| 189 |
* We will try to build full blown locator metadata information from that. |
| 190 |
* |
| 191 |
* @deprecated |
| 192 |
* |
| 193 |
*/ |
| 194 |
var $_in = NULL; |
| 195 |
|
| 196 |
/** |
| 197 |
* This var holds the locator metadata informations inside |
| 198 |
* a single hash. This is returned from '->get()'. |
| 199 |
* |
| 200 |
* @deprecated |
| 201 |
* |
| 202 |
*/ |
| 203 |
var $_out = NULL; |
| 204 |
|
| 205 |
|
| 206 |
/** |
| 207 |
* Locator metadata. |
| 208 |
* |
| 209 |
*/ |
| 210 |
|
| 211 |
// name of a Proxy module |
| 212 |
var $_datasource_type; |
| 213 |
|
| 214 |
// name of an Adapter module |
| 215 |
var $_adapter_type; |
| 216 |
|
| 217 |
// additional information required (passed on to the Proxy by DataSource::Generic) |
| 218 |
var $_metadata = array(); |
| 219 |
|
| 220 |
//var $_dsn; |
| 221 |
|
| 222 |
|
| 223 |
/** |
| 224 |
* The constructor is used to pass in the |
| 225 |
* locator metadata hash. |
| 226 |
* |
| 227 |
* @param object(DataSource::Locator)|hash optional: a &$locator instance |
| 228 |
*/ |
| 229 |
function DataSource_Locator() { |
| 230 |
$args_multi = func_get_args(); |
| 231 |
|
| 232 |
//php::array_shrink($args_multi); |
| 233 |
|
| 234 |
//print Dumper($args_multi); |
| 235 |
//exit; |
| 236 |
|
| 237 |
foreach ($args_multi as $args) { |
| 238 |
if (isset($args)) { |
| 239 |
$this->merge_args($args); |
| 240 |
} |
| 241 |
} |
| 242 |
|
| 243 |
$this->build(); |
| 244 |
//$this->check(); |
| 245 |
} |
| 246 |
|
| 247 |
function merge_args(&$args) { |
| 248 |
|
| 249 |
//print "args: " . Dumper($args); |
| 250 |
|
| 251 |
// check if passed in locator is already of type *me* ... |
| 252 |
// ... if so, merge it into current instance |
| 253 |
if (is_object($args) && get_class($args) == get_class($this)) { |
| 254 |
$this->merge_to($this, $args); |
| 255 |
|
| 256 |
} else { |
| 257 |
|
| 258 |
// FIXME: handle locator merging here? |
| 259 |
//$this->_arguments = &$args; |
| 260 |
|
| 261 |
// FIXME: to php::merge_to($this, $locator) here!!! |
| 262 |
//$this->_data |
| 263 |
// for now: assume plain hash, so just iterate and overwrite! |
| 264 |
$this->merge_to($this, $args, '_'); |
| 265 |
|
| 266 |
} |
| 267 |
} |
| 268 |
|
| 269 |
function merge_to(&$target, $source, $prefix_key = '') { |
| 270 |
|
| 271 |
//print "target: " . Dumper($target); |
| 272 |
//print "source: " . Dumper($source); |
| 273 |
|
| 274 |
// pre-flight checks |
| 275 |
if (!isset($target)) { |
| 276 |
user_error("variable passed as reference (merge target) is not set."); |
| 277 |
return; |
| 278 |
} |
| 279 |
//if (!is_hash($hash)) { |
| 280 |
if (!isset($source)) { |
| 281 |
user_error("variable passed as source is not set."); |
| 282 |
return; |
| 283 |
} |
| 284 |
|
| 285 |
// perform merge |
| 286 |
foreach ($source as $key => $val) { |
| 287 |
$name = $prefix_key . $key; |
| 288 |
if (is_object($target)) { |
| 289 |
$target->$name = $val; |
| 290 |
//} elseif (php::is_hash($target)) { |
| 291 |
} else { |
| 292 |
$target[$name] = $val; |
| 293 |
} |
| 294 |
} |
| 295 |
|
| 296 |
// indicate good |
| 297 |
return 1; |
| 298 |
|
| 299 |
} |
| 300 |
|
| 301 |
/** |
| 302 |
* Set the locator metadata hash we will feed *partly* |
| 303 |
* to an encapsulated Data::Driver::Proxy instance |
| 304 |
* |
| 305 |
* @param LocatorMetadataHash array - |
| 306 |
* |
| 307 |
*/ |
| 308 |
function set( &$locator ) { |
| 309 |
$this->_out = &$locator; |
| 310 |
} |
| 311 |
|
| 312 |
function &get_metadata() { |
| 313 |
//return ($this->_out); |
| 314 |
return $this->_metadata; |
| 315 |
} |
| 316 |
|
| 317 |
|
| 318 |
function build( ) { |
| 319 |
|
| 320 |
// trace |
| 321 |
//print Dumper($this); |
| 322 |
|
| 323 |
$good = 0; |
| 324 |
switch ($this->_datasource_type) { |
| 325 |
case 'rpc': |
| 326 |
// get rpc connection information from global constants |
| 327 |
$metadata = array( |
| 328 |
//package => 'Data::Driver::Proxy', |
| 329 |
//package => 'DataSource::Proxy::XMLRPC', |
| 330 |
//package => 'DataSource::Generic', |
| 331 |
//package => 'DesignPattern::RemoteProxy', |
| 332 |
Host => RPC_HOSTNAME, |
| 333 |
Port => RPC_PORT, |
| 334 |
); |
| 335 |
$good = 1; |
| 336 |
break; |
| 337 |
} |
| 338 |
|
| 339 |
if ($good) { |
| 340 |
|
| 341 |
// V1: |
| 342 |
/* |
| 343 |
$this->_out = array( |
| 344 |
datasource_type => $datasource, |
| 345 |
adapter_type => 'Data', |
| 346 |
metadata => $metadata, |
| 347 |
); |
| 348 |
*/ |
| 349 |
|
| 350 |
// V2: |
| 351 |
//$this->_out = $metadata; |
| 352 |
|
| 353 |
// V3: |
| 354 |
$this->merge_to($this->_metadata, $metadata); |
| 355 |
|
| 356 |
} |
| 357 |
|
| 358 |
// trace |
| 359 |
//print Dumper($this); |
| 360 |
|
| 361 |
} |
| 362 |
|
| 363 |
function check() { |
| 364 |
if (!sizeof($this->_metadata)) { |
| 365 |
user_error("DataSource::Locator::check() failed: " . "Locator metadata not established, please check configuration options."); |
| 366 |
return; |
| 367 |
} |
| 368 |
return 1; |
| 369 |
} |
| 370 |
|
| 371 |
|
| 372 |
} |
| 373 |
|
| 374 |
?> |
Parent Directory
| 
Revision Log
