| 1 |
<?php |
| 2 |
|
| 3 |
/** |
| 4 |
* ------------------------------------------------------------------------- |
| 5 |
* $Id: RemoteProxy.php,v 1.1 2003/03/03 22:06:46 joko Exp $ |
| 6 |
* ------------------------------------------------------------------------- |
| 7 |
* $Log: RemoteProxy.php,v $ |
| 8 |
* Revision 1.1 2003/03/03 22:06:46 joko |
| 9 |
* refactored from Data::Driver::Proxy |
| 10 |
* |
| 11 |
* Revision 1.3 2003/03/01 04:56:38 joko |
| 12 |
* new comment style for large blocks - stolen from phpHtmlLib |
| 13 |
* commit-log encapsulated into such a block |
| 14 |
* introduced some documentation |
| 15 |
* refactored todo (now also inside a stylish block) |
| 16 |
* |
| 17 |
* Revision 1.2 2003/02/13 21:48:09 joko |
| 18 |
* + caching mechanisms more configurable now |
| 19 |
* |
| 20 |
* Revision 1.1 2003/02/09 17:23:21 joko |
| 21 |
* + refactored from flib/Application/RPC/ProxyObject.php |
| 22 |
* |
| 23 |
* Revision 1.7 2003/02/03 03:31:38 jonen |
| 24 |
* - moved '$encoder->toISO()' to 'Remote.php' |
| 25 |
* |
| 26 |
* Revision 1.6 2002/12/22 13:26:20 jonen |
| 27 |
* + added support of tangram independent id (e.g. Data::UUID) toggled by option at conrtuctor |
| 28 |
* |
| 29 |
* Revision 1.5 2002/12/18 22:36:49 jonen |
| 30 |
* + added support to get remote objects via backend via 'guid' |
| 31 |
* + renamed '_loadBackend' to '_loadRemote' |
| 32 |
* + constructor now accepts additional options: |
| 33 |
* + remote: try to get object via '_loadRemote' ... |
| 34 |
* + oid: use the given identifier as an 'oid' when doing '_loadRemote' |
| 35 |
* + guid: use the given identifier as a 'guid' when doing '_loadRemote' |
| 36 |
* |
| 37 |
* Revision 1.4 2002/12/12 02:46:31 joko |
| 38 |
* + state (session) gets flushed when data was successfully loaded from remote side |
| 39 |
* + fixed _loadBackend |
| 40 |
* + fixed flushState |
| 41 |
* |
| 42 |
* Revision 1.3 2002/12/06 04:12:54 joko |
| 43 |
* + replaced 'xyzCache' through 'xyzProxy' |
| 44 |
* + function store(...) |
| 45 |
* |
| 46 |
* Revision 1.2 2002/12/05 21:44:09 joko |
| 47 |
* + debugging |
| 48 |
* |
| 49 |
* Revision 1.1 2002/12/01 17:23:58 joko |
| 50 |
* + initial check-in |
| 51 |
* |
| 52 |
* Revision 1.11 2002/11/12 06:05:58 cvsjoko |
| 53 |
* + renamed class: Text_Encode -> TextEncode |
| 54 |
* |
| 55 |
* Revision 1.10 2002/10/29 19:15:33 cvsjoko |
| 56 |
* - moved utf8/iso-conversion to lib/utils/Text_Encode.php |
| 57 |
* |
| 58 |
* Revision 1.9 2002/10/26 12:32:36 cvsjoko |
| 59 |
* - removed debugging via "print" |
| 60 |
* + added generic logging via PEAR::Log |
| 61 |
* |
| 62 |
* Revision 1.8 2002/10/22 09:51:38 cvsmax |
| 63 |
* + moved semi-method 'createBackend' to method $site->user->create at User.class.php |
| 64 |
* |
| 65 |
* Revision 1.7 2002/10/21 18:27:09 cvsjoko |
| 66 |
* - manually disabled any form of caching |
| 67 |
* |
| 68 |
* Revision 1.6 2002/10/17 03:48:47 cvsmax |
| 69 |
* + new |
| 70 |
* + function _createBackend create new Backend |
| 71 |
* + function _create api-create |
| 72 |
* |
| 73 |
* Revision 1.5 2002/10/16 03:37:54 cvsjoko |
| 74 |
* + bugfix: wrong comparison in restriction to save to array |
| 75 |
* |
| 76 |
* Revision 1.4 2002/10/10 03:04:23 cvsjoko |
| 77 |
* + no debug-output |
| 78 |
* |
| 79 |
* Revision 1.3 2002/10/10 03:03:27 cvsjoko |
| 80 |
* + bugfix: save object to cache only if payload from backend isn't empty |
| 81 |
* |
| 82 |
* Revision 1.2 2002/10/10 02:40:06 cvsjoko |
| 83 |
* + new level of data-caching (session and persistant) |
| 84 |
* + function _loadState loads data from session |
| 85 |
* + function _saveState saves data to session |
| 86 |
* + function save api-save (session & backend) |
| 87 |
* + function _commit saves data to backend |
| 88 |
* + handy utils |
| 89 |
* + function _setAttributes |
| 90 |
* + function flushState |
| 91 |
* |
| 92 |
* Revision 1.1 2002/10/09 00:51:39 cvsjoko |
| 93 |
* + new |
| 94 |
* ------------------------------------------------------------------------- |
| 95 |
*/ |
| 96 |
|
| 97 |
/** |
| 98 |
* |
| 99 |
* Data::Driver::Proxy -- Multiple stage data fetching and caching |
| 100 |
* |
| 101 |
* |
| 102 |
* This class (Data::Driver::Proxy) provides an abstract framework |
| 103 |
* for loading/saving arbitrary data from/to data storages interfaced |
| 104 |
* by storage *proxy*-drivers. |
| 105 |
* Don't mix these up with the concrete storage *handle*-drivers |
| 106 |
* doing the lowlevel stuff (opening files, talking sql, etc.). |
| 107 |
* These proxy-drivers are "just" wrappers around them |
| 108 |
* providing a more highlevel, consistent API making |
| 109 |
* it easier for Data::Driver::Proxy to do its main work: |
| 110 |
* |
| 111 |
* Multiple stage data fetching and caching: |
| 112 |
* |
| 113 |
* DATA, ... |
| 114 |
* ... also refered to as data, should be handled as |
| 115 |
* something called data. |
| 116 |
* |
| 117 |
* STAGES |
| 118 |
* x native php4 session: serialized payload |
| 119 |
* x single rdbms table: serialized payload |
| 120 |
* x ... via custom database wrapper |
| 121 |
* x included php-file, included php-library |
| 122 |
* o object, component, package, callbacks |
| 123 |
* x ... via php PEAR DB abstraction objects |
| 124 |
* x remote objects (items): flat attribute hash |
| 125 |
* o use Data::Object::Identity |
| 126 |
* o via Data::Driver::Proxy::RPC or others |
| 127 |
* o Data::Object::Encoder: encodes/decodes values |
| 128 |
* o Data::Object::Interpolator: interpolates/resolves references |
| 129 |
* |
| 130 |
* WORK |
| 131 |
* x move data transparently around between these stages |
| 132 |
* |
| 133 |
* TOOLS |
| 134 |
* |
| 135 |
* x Overview - Packages, Handlers and Stages: |
| 136 |
* This is weird. ;-) |
| 137 |
* - A Package can be instantiated by its namespaced classname |
| 138 |
* e.g.: "mkObject('My::Package');" |
| 139 |
* - A Package can be a Handler for Data::Driver::Proxy |
| 140 |
* - A Handler implements exactly one Stage |
| 141 |
* - Data::Driver::Proxy itself embeds these Stages: |
| 142 |
* x php4-session |
| 143 |
* x rdbms-table |
| 144 |
* - An example Handler is Data::Driver::RPC::Remote |
| 145 |
* |
| 146 |
* x Handlers: |
| 147 |
* x Data::Driver::RPC::Remote |
| 148 |
* Interacts with a RPC::XML server (todo: talk SOAP!) |
| 149 |
* using PEAR::XML::RPC. |
| 150 |
* It can cache data for "disconnected mode" using the |
| 151 |
* o Data::Driver::phpHtmlLib |
| 152 |
* o Data::Driver::PEAR::DB |
| 153 |
* x Data::Driver::PEAR::Tree (via Data::Lift) |
| 154 |
* |
| 155 |
*/ |
| 156 |
|
| 157 |
/** |
| 158 |
* Todo: |
| 159 |
* x extend options to en-/disable caching via a) session and/or b) database |
| 160 |
* o make feature available via runtime setter-method to these options |
| 161 |
* o use PEAR::Cache for caching purposes!!! |
| 162 |
* o refactor database access: use PEAR for this! no more 'connectdb' here!!! |
| 163 |
* o make database connection more flexible to make possible |
| 164 |
* to have different (probably named) proxy databases (besides a "main database") |
| 165 |
* o rename this to Data::Proxy? or split into Data::Query, Data::Result and Data::Wrapper? |
| 166 |
* |
| 167 |
*/ |
| 168 |
|
| 169 |
/** |
| 170 |
* Load required modules: |
| 171 |
* |
| 172 |
*/ |
| 173 |
loadModule('DesignPattern::Proxy'); |
| 174 |
|
| 175 |
class DesignPattern_RemoteProxy extends DesignPattern_Proxy { |
| 176 |
|
| 177 |
var $objectId; |
| 178 |
// purpose ... |
| 179 |
var $meta; |
| 180 |
var $payload; |
| 181 |
var $attributes; |
| 182 |
var $backend; |
| 183 |
|
| 184 |
function DesignPattern_RemoteProxy($objectId = "", $options = array() ) { |
| 185 |
logp(get_class($this) . "->new()", PEAR_LOG_INFO); |
| 186 |
global $proxy; |
| 187 |
|
| 188 |
// 2003-03-05 - modified constructor |
| 189 |
// expand objectId |
| 190 |
if (is_array($objectId)) { |
| 191 |
$options = $objectId[1]; |
| 192 |
$objectId = $objectId[0]; |
| 193 |
} |
| 194 |
|
| 195 |
// trace |
| 196 |
//print Dumper($objectId, $options); |
| 197 |
|
| 198 |
// initialization/startup |
| 199 |
$this->_init_meta_options($objectId, $options); |
| 200 |
$this->_init_caching(); |
| 201 |
$this->_init_load(); |
| 202 |
|
| 203 |
//print Dumper($this); |
| 204 |
|
| 205 |
} |
| 206 |
|
| 207 |
function _init_meta_options( $objectId="", $options = array() ) { |
| 208 |
$this->meta = $options; |
| 209 |
|
| 210 |
if ($objectId) { |
| 211 |
$this->objectId = $objectId; |
| 212 |
|
| 213 |
// set default load mechanism |
| 214 |
if ( $this->meta[remote] && ((!$this->meta[oid] && !$this->meta[guid]) || ($this->meta[oid] && $this->meta[guid])) && (!$this->meta[key]) ) { |
| 215 |
$this->meta[oid] = 1; |
| 216 |
} |
| 217 |
|
| 218 |
} |
| 219 |
} |
| 220 |
|
| 221 |
function _init_caching() { |
| 222 |
|
| 223 |
if ($this->meta[cache][session]) { |
| 224 |
session_register_safe("proxy"); |
| 225 |
} |
| 226 |
|
| 227 |
if ($this->meta[remote]) { |
| 228 |
//$this->backend = mkObject('Data::Driver::RPC::Remote', $this->meta[rpcinfo]); |
| 229 |
$this->backend = php::mkComponent('DataSource::Proxy::XMLRPC', $this->meta[rpcinfo]); |
| 230 |
} |
| 231 |
} |
| 232 |
|
| 233 |
function _init_load() { |
| 234 |
if ($this->objectId) { |
| 235 |
$this->load(); |
| 236 |
//$this->_saveProxy(); |
| 237 |
} |
| 238 |
} |
| 239 |
|
| 240 |
|
| 241 |
function load() { |
| 242 |
logp(get_class($this) . "->load()", PEAR_LOG_INFO); |
| 243 |
if (!$this->_loadState()) { |
| 244 |
if (!$this->_loadProxy()) { |
| 245 |
|
| 246 |
// just load object from remote side if its flagged to be a remote one ... |
| 247 |
if ($this->meta[remote]) { |
| 248 |
$this->_loadRemote(); |
| 249 |
} |
| 250 |
|
| 251 |
} |
| 252 |
} |
| 253 |
} |
| 254 |
|
| 255 |
function save($data, $type) { |
| 256 |
$this->_setAttributes($data); |
| 257 |
$this->_saveState(); |
| 258 |
if ($type == 'commit') { |
| 259 |
$this->_commit(); |
| 260 |
} |
| 261 |
if ($type == 'create') { |
| 262 |
$this->_create(); |
| 263 |
} |
| 264 |
} |
| 265 |
|
| 266 |
function flush() { |
| 267 |
$this->flushState(); |
| 268 |
$this->flushProxy(); |
| 269 |
} |
| 270 |
|
| 271 |
function _commit() { |
| 272 |
$this->_saveBackend($this->attributes); |
| 273 |
$this->flushState(); |
| 274 |
$this->flushProxy(); |
| 275 |
} |
| 276 |
|
| 277 |
|
| 278 |
// TODO: make this work |
| 279 |
/* |
| 280 |
function _create() { |
| 281 |
$this->_createBackend($this->attributes); |
| 282 |
$this->flushState(); |
| 283 |
$this->flushProxy(); |
| 284 |
} |
| 285 |
*/ |
| 286 |
|
| 287 |
function getResult() { |
| 288 |
if (!$this->meta[decoded]) { |
| 289 |
$this->_decode(); |
| 290 |
$this->_saveState(); |
| 291 |
} |
| 292 |
return $this->attributes; |
| 293 |
} |
| 294 |
|
| 295 |
function _setAttributes($data) { |
| 296 |
$this->attributes = $data; |
| 297 |
} |
| 298 |
|
| 299 |
function flushProxy() { |
| 300 |
connectdb(); |
| 301 |
$sql = "DELETE FROM f_proxy WHERE oid='$this->objectId'"; |
| 302 |
send_sql($sql); |
| 303 |
} |
| 304 |
|
| 305 |
function flushState() { |
| 306 |
global $proxy; |
| 307 |
unset($proxy[$this->objectId]); |
| 308 |
$this->meta[decoded] = 0; |
| 309 |
} |
| 310 |
|
| 311 |
function _loadState() { |
| 312 |
global $proxy; |
| 313 |
|
| 314 |
// trace |
| 315 |
//print Dumper($this); |
| 316 |
|
| 317 |
// debug |
| 318 |
logp(get_class($this) . "->_loadState()"); |
| 319 |
|
| 320 |
if ($this->attributes = $proxy[$this->objectId]) { |
| 321 |
//print "_loadState:" . dumpVar($this->attributes); |
| 322 |
$this->meta[decoded] = 1; |
| 323 |
// TODO: make a parameter from this (0 deactivates session-layer) |
| 324 |
return 0; |
| 325 |
} |
| 326 |
} |
| 327 |
|
| 328 |
function _saveState() { |
| 329 |
global $proxy; |
| 330 |
logp(get_class($this) . "->_saveState()"); |
| 331 |
$proxy[$this->objectId] = $this->attributes; |
| 332 |
//print "_saveState: " . dumpVar($this->attributes); |
| 333 |
// TODO: throw exception-message back to user if operation fails |
| 334 |
} |
| 335 |
|
| 336 |
function _loadProxy() { |
| 337 |
|
| 338 |
// FIXME! |
| 339 |
if (!$this->meta[cache][db]) { return; } |
| 340 |
|
| 341 |
// trace & debug |
| 342 |
//print Dumper($this); |
| 343 |
logp(get_class($this) . "->_loadProxy()"); |
| 344 |
|
| 345 |
connectdb(); |
| 346 |
$sql = "SELECT payload FROM f_proxy WHERE oid='$this->objectId'"; |
| 347 |
if ($res = send_sql($sql)) { |
| 348 |
$row = mysql_fetch_array($res, MYSQL_ASSOC); |
| 349 |
if ($row) { |
| 350 |
$this->payload = $row[payload]; |
| 351 |
// TODO: make a parameter from this (0 deactivates mysqldb-layer) |
| 352 |
return 0; |
| 353 |
} |
| 354 |
} |
| 355 |
} |
| 356 |
|
| 357 |
// TODO: use PEAR here |
| 358 |
function _saveProxy() { |
| 359 |
|
| 360 |
// FIXME! |
| 361 |
if (!$this->meta[cache][db]) { return; } |
| 362 |
|
| 363 |
logp(get_class($this) . "->_saveProxy()"); |
| 364 |
connectdb(); |
| 365 |
if ($this->payload) { |
| 366 |
//$sql = "INSERT INTO f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'"; |
| 367 |
$sql = "INSERT INTO f_proxy SET oid='$this->objectId', payload='$this->payload'"; |
| 368 |
if (!send_sql($sql)) { |
| 369 |
$sql = "UPDATE f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'"; |
| 370 |
send_sql($sql); |
| 371 |
} |
| 372 |
} |
| 373 |
} |
| 374 |
|
| 375 |
function _loadRemote() { |
| 376 |
logp(get_class($this) . "->_loadRemote()"); |
| 377 |
|
| 378 |
// trace |
| 379 |
//print Dumper($this->meta); |
| 380 |
|
| 381 |
// TODO: test backend for reachability first (eventually cache this information and "reset" it by another party) |
| 382 |
|
| 383 |
// 1. check backend-handle |
| 384 |
if (!$this->backend) { |
| 385 |
logp(get_class($this) . "->_loadRemote: no backend handle, please check argument 'rpcinfo'", PEAR_LOG_CRIT); |
| 386 |
return; |
| 387 |
} |
| 388 |
|
| 389 |
// determine backend action by metadata |
| 390 |
// check for guid or oid |
| 391 |
if ($this->meta[guid]) { |
| 392 |
if (!$this->objectId) { |
| 393 |
logp(get_class($this) . "->_loadRemote: argument 'guid' requires valid objectId", PEAR_LOG_WARNING); |
| 394 |
return; |
| 395 |
} |
| 396 |
if (!$this->meta[classname]) { |
| 397 |
logp(get_class($this) . "->_loadRemote: argument 'guid' requires 'classname'", PEAR_LOG_WARNING); |
| 398 |
return; |
| 399 |
} |
| 400 |
$args = array( guid => $this->objectId, classname => $this->meta[classname] ); |
| 401 |
$result = $this->backend->send('getObjectByGuid', $args ); |
| 402 |
|
| 403 |
} elseif ($this->meta[oid]) { |
| 404 |
if (!$this->objectId) { |
| 405 |
logp(get_class($this) . "->_loadRemote: argument 'oid' requires valid objectId", PEAR_LOG_WARNING); |
| 406 |
return; |
| 407 |
} |
| 408 |
$result = $this->backend->send('getObject', $this->objectId); |
| 409 |
|
| 410 |
} elseif ($this->meta[key]) { |
| 411 |
if (!$this->meta[command]) { |
| 412 |
logp(get_class($this) . "->_loadRemote: argument 'key' requires 'command'", PEAR_LOG_WARNING); |
| 413 |
return; |
| 414 |
} |
| 415 |
/* |
| 416 |
if (!$this->meta[query]) { |
| 417 |
logp(get_class($this) . "->_loadRemote: argument 'key' requires 'query'", PEAR_LOG_WARNING); |
| 418 |
return; |
| 419 |
} |
| 420 |
*/ |
| 421 |
$result = $this->backend->send($this->meta[command], $this->meta[query]); |
| 422 |
|
| 423 |
} |
| 424 |
|
| 425 |
|
| 426 |
|
| 427 |
if ($result) { |
| 428 |
//print "result: " . dumpVar($result) . "<br>"; |
| 429 |
if (count($result) == 0) { return; } |
| 430 |
|
| 431 |
// FIXME: this is dangerous! |
| 432 |
if ($_GET[debug]) { |
| 433 |
print Dumper($result); |
| 434 |
} |
| 435 |
|
| 436 |
$this->payload = serialize($result); |
| 437 |
// ----- move this to _encode some times |
| 438 |
|
| 439 |
$this->_saveProxy(); |
| 440 |
//print "oid: $this->objectId<br>"; |
| 441 |
$this->flushState(); |
| 442 |
} else { |
| 443 |
//print "Error in _loadRemote!!!<br>"; |
| 444 |
logp(get_class($this) . "->_loadRemote: error while trying to talk to remote side", PEAR_LOG_CRIT); |
| 445 |
} |
| 446 |
|
| 447 |
} |
| 448 |
|
| 449 |
function _saveBackend($result) { |
| 450 |
logp(get_class($this) . "->_saveBackend()"); |
| 451 |
|
| 452 |
//$encoder = new TextEncode($result); |
| 453 |
//$encoder->toUTF8(); |
| 454 |
|
| 455 |
// check for guid or oid |
| 456 |
if($this->meta[guid]) { |
| 457 |
$args = array( 'guid' => $this->objectId, 'classname' => $this->meta[classname], 'data' => $result ); |
| 458 |
$response = $this->backend->send('saveObjectByGuid', $args, array( utf8 => 1) ); |
| 459 |
} |
| 460 |
if($this->meta[oid]) { |
| 461 |
$response = $this->backend->send('saveObject', array('oid' => $this->objectId, 'data' => $result), array( utf8 => 1) ); |
| 462 |
} |
| 463 |
} |
| 464 |
|
| 465 |
function _decode() { |
| 466 |
// fill attributes-hashtable from message-hashtable |
| 467 |
if (!$this->payload) { return; } |
| 468 |
//if ($this->attributes = $backend->decodeData($this->payload)) { |
| 469 |
if ($this->attributes = unserialize($this->payload)) { |
| 470 |
$this->meta[decoded] = 1; |
| 471 |
} |
| 472 |
} |
| 473 |
|
| 474 |
function store($struct) { |
| 475 |
$this->payload = serialize($struct); |
| 476 |
$this->_saveProxy(); |
| 477 |
} |
| 478 |
|
| 479 |
} |
| 480 |
|
| 481 |
?> |
Parent Directory
| 
Revision Log
