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