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joko |
1.1 |
<?php |
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joko |
1.3 |
/** |
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* This file contains the DesignPattern::RemoteProxy class |
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* |
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* @author Andreas Motl <andreas.motl@ilo.de> |
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* @package org.netfrag.glib |
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* @name DesignPattern::RemoteProxy |
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joko |
1.4 |
* @filesource |
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joko |
1.3 |
* |
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joko |
1.4 |
* |
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* <b>Cvs-Log:</b> |
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* |
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* <pre> |
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joko |
1.1 |
* ------------------------------------------------------------------------- |
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joko |
1.4 |
* $Id: RemoteProxy.php,v 1.3 2003/03/05 16:10:17 joko Exp $ |
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joko |
1.1 |
* ------------------------------------------------------------------------- |
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joko |
1.2 |
* $Log: RemoteProxy.php,v $ |
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joko |
1.4 |
* Revision 1.3 2003/03/05 16:10:17 joko |
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* updated docu (phpDocumentor testing....) |
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* |
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joko |
1.3 |
* Revision 1.2 2003/03/05 12:14:02 joko |
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* renamed method |
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* constructor argument expansion |
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* |
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joko |
1.2 |
* Revision 1.1 2003/03/03 22:06:46 joko |
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* refactored from Data::Driver::Proxy |
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* |
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joko |
1.1 |
* Revision 1.3 2003/03/01 04:56:38 joko |
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* new comment style for large blocks - stolen from phpHtmlLib |
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* commit-log encapsulated into such a block |
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* introduced some documentation |
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* refactored todo (now also inside a stylish block) |
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* |
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* Revision 1.2 2003/02/13 21:48:09 joko |
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* + caching mechanisms more configurable now |
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* |
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* Revision 1.1 2003/02/09 17:23:21 joko |
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* + refactored from flib/Application/RPC/ProxyObject.php |
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* |
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* Revision 1.7 2003/02/03 03:31:38 jonen |
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* - moved '$encoder->toISO()' to 'Remote.php' |
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* |
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* Revision 1.6 2002/12/22 13:26:20 jonen |
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* + added support of tangram independent id (e.g. Data::UUID) toggled by option at conrtuctor |
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* |
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* Revision 1.5 2002/12/18 22:36:49 jonen |
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* + added support to get remote objects via backend via 'guid' |
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* + renamed '_loadBackend' to '_loadRemote' |
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* + constructor now accepts additional options: |
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* + remote: try to get object via '_loadRemote' ... |
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* + oid: use the given identifier as an 'oid' when doing '_loadRemote' |
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* + guid: use the given identifier as a 'guid' when doing '_loadRemote' |
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* |
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* Revision 1.4 2002/12/12 02:46:31 joko |
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* + state (session) gets flushed when data was successfully loaded from remote side |
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* + fixed _loadBackend |
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* + fixed flushState |
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* |
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* Revision 1.3 2002/12/06 04:12:54 joko |
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* + replaced 'xyzCache' through 'xyzProxy' |
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* + function store(...) |
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* |
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* Revision 1.2 2002/12/05 21:44:09 joko |
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* + debugging |
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* |
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* Revision 1.1 2002/12/01 17:23:58 joko |
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* + initial check-in |
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* |
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* Revision 1.11 2002/11/12 06:05:58 cvsjoko |
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* + renamed class: Text_Encode -> TextEncode |
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* |
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* Revision 1.10 2002/10/29 19:15:33 cvsjoko |
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* - moved utf8/iso-conversion to lib/utils/Text_Encode.php |
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* |
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* Revision 1.9 2002/10/26 12:32:36 cvsjoko |
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* - removed debugging via "print" |
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* + added generic logging via PEAR::Log |
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* |
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* Revision 1.8 2002/10/22 09:51:38 cvsmax |
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* + moved semi-method 'createBackend' to method $site->user->create at User.class.php |
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* |
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* Revision 1.7 2002/10/21 18:27:09 cvsjoko |
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* - manually disabled any form of caching |
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* |
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* Revision 1.6 2002/10/17 03:48:47 cvsmax |
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* + new |
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* + function _createBackend create new Backend |
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* + function _create api-create |
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* |
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* Revision 1.5 2002/10/16 03:37:54 cvsjoko |
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* + bugfix: wrong comparison in restriction to save to array |
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* |
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* Revision 1.4 2002/10/10 03:04:23 cvsjoko |
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* + no debug-output |
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* |
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* Revision 1.3 2002/10/10 03:03:27 cvsjoko |
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* + bugfix: save object to cache only if payload from backend isn't empty |
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* |
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* Revision 1.2 2002/10/10 02:40:06 cvsjoko |
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* + new level of data-caching (session and persistant) |
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* + function _loadState loads data from session |
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* + function _saveState saves data to session |
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* + function save api-save (session & backend) |
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* + function _commit saves data to backend |
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* + handy utils |
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* + function _setAttributes |
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* + function flushState |
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* |
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* Revision 1.1 2002/10/09 00:51:39 cvsjoko |
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* + new |
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* ------------------------------------------------------------------------- |
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joko |
1.4 |
* </pre> |
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* |
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joko |
1.1 |
*/ |
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joko |
1.4 |
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/** |
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* Load required modules: |
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* |
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*/ |
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loadModule('DesignPattern::Proxy'); |
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joko |
1.1 |
/** |
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* Data::Driver::Proxy -- Multiple stage data fetching and caching |
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* |
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* |
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* This class (Data::Driver::Proxy) provides an abstract framework |
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* for loading/saving arbitrary data from/to data storages interfaced |
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* by storage *proxy*-drivers. |
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* Don't mix these up with the concrete storage *handle*-drivers |
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* doing the lowlevel stuff (opening files, talking sql, etc.). |
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* These proxy-drivers are "just" wrappers around them |
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* providing a more highlevel, consistent API making |
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* it easier for Data::Driver::Proxy to do its main work: |
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* |
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* Multiple stage data fetching and caching: |
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* |
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joko |
1.4 |
* <pre> |
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* |
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joko |
1.1 |
* DATA, ... |
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* ... also refered to as data, should be handled as |
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* something called data. |
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* |
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* STAGES |
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* x native php4 session: serialized payload |
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* x single rdbms table: serialized payload |
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* x ... via custom database wrapper |
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* x included php-file, included php-library |
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* o object, component, package, callbacks |
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* x ... via php PEAR DB abstraction objects |
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* x remote objects (items): flat attribute hash |
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* o use Data::Object::Identity |
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* o via Data::Driver::Proxy::RPC or others |
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* o Data::Object::Encoder: encodes/decodes values |
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* o Data::Object::Interpolator: interpolates/resolves references |
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* |
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* WORK |
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* x move data transparently around between these stages |
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* |
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* TOOLS |
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* |
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* x Overview - Packages, Handlers and Stages: |
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* This is weird. ;-) |
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* - A Package can be instantiated by its namespaced classname |
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* e.g.: "mkObject('My::Package');" |
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* - A Package can be a Handler for Data::Driver::Proxy |
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* - A Handler implements exactly one Stage |
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* - Data::Driver::Proxy itself embeds these Stages: |
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* x php4-session |
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* x rdbms-table |
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* - An example Handler is Data::Driver::RPC::Remote |
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* |
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* x Handlers: |
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* x Data::Driver::RPC::Remote |
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* Interacts with a RPC::XML server (todo: talk SOAP!) |
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* using PEAR::XML::RPC. |
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* It can cache data for "disconnected mode" using the |
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* o Data::Driver::phpHtmlLib |
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* o Data::Driver::PEAR::DB |
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* x Data::Driver::PEAR::Tree (via Data::Lift) |
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* |
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joko |
1.4 |
* </pre> |
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* |
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* |
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* An attempt to implement some software design patterns |
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joko |
1.3 |
* --- RemoteProxyPattern |
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* |
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* @link http://c2.com/cgi-bin/wiki?ProxyPattern |
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* |
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* @author Andreas Motl <andreas.motl@ilo.de> |
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* @link http://www.netfrag.org/~joko/ |
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* |
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* @copyright (c) 2003 - All Rights reserved. |
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* @license GNU LGPL (GNU Lesser General Public License) |
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* @link http://www.gnu.org/licenses/lgpl.txt |
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* |
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* @package org.netfrag.glib |
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* @name DesignPattern::RemoteProxy |
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* |
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joko |
1.4 |
* |
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joko |
1.3 |
* @todo |
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* <pre> |
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joko |
1.1 |
* x extend options to en-/disable caching via a) session and/or b) database |
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* o make feature available via runtime setter-method to these options |
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* o use PEAR::Cache for caching purposes!!! |
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* o refactor database access: use PEAR for this! no more 'connectdb' here!!! |
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* o make database connection more flexible to make possible |
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* to have different (probably named) proxy databases (besides a "main database") |
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* o rename this to Data::Proxy? or split into Data::Query, Data::Result and Data::Wrapper? |
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joko |
1.3 |
* </pre> |
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joko |
1.1 |
* |
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*/ |
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class DesignPattern_RemoteProxy extends DesignPattern_Proxy { |
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var $objectId; |
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// purpose ... |
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var $meta; |
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var $payload; |
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var $attributes; |
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var $backend; |
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function DesignPattern_RemoteProxy($objectId = "", $options = array() ) { |
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logp(get_class($this) . "->new()", PEAR_LOG_INFO); |
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global $proxy; |
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joko |
1.2 |
// 2003-03-05 - modified constructor |
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// expand objectId |
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if (is_array($objectId)) { |
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$options = $objectId[1]; |
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$objectId = $objectId[0]; |
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} |
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joko |
1.1 |
// trace |
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//print Dumper($objectId, $options); |
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// initialization/startup |
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$this->_init_meta_options($objectId, $options); |
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$this->_init_caching(); |
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$this->_init_load(); |
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joko |
1.2 |
//print Dumper($this); |
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joko |
1.1 |
} |
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function _init_meta_options( $objectId="", $options = array() ) { |
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$this->meta = $options; |
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if ($objectId) { |
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$this->objectId = $objectId; |
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// set default load mechanism |
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if ( $this->meta[remote] && ((!$this->meta[oid] && !$this->meta[guid]) || ($this->meta[oid] && $this->meta[guid])) && (!$this->meta[key]) ) { |
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$this->meta[oid] = 1; |
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} |
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} |
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} |
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function _init_caching() { |
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if ($this->meta[cache][session]) { |
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session_register_safe("proxy"); |
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} |
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if ($this->meta[remote]) { |
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//$this->backend = mkObject('Data::Driver::RPC::Remote', $this->meta[rpcinfo]); |
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joko |
1.2 |
$this->backend = php::mkComponent('DataSource::Proxy::XMLRPC', $this->meta[rpcinfo]); |
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joko |
1.1 |
} |
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} |
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function _init_load() { |
275 |
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if ($this->objectId) { |
276 |
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$this->load(); |
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//$this->_saveProxy(); |
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} |
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} |
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function load() { |
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logp(get_class($this) . "->load()", PEAR_LOG_INFO); |
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if (!$this->_loadState()) { |
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if (!$this->_loadProxy()) { |
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// just load object from remote side if its flagged to be a remote one ... |
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if ($this->meta[remote]) { |
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$this->_loadRemote(); |
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} |
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} |
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} |
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} |
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function save($data, $type) { |
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$this->_setAttributes($data); |
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$this->_saveState(); |
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if ($type == 'commit') { |
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$this->_commit(); |
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} |
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if ($type == 'create') { |
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$this->_create(); |
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} |
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} |
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function flush() { |
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$this->flushState(); |
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$this->flushProxy(); |
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} |
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function _commit() { |
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$this->_saveBackend($this->attributes); |
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$this->flushState(); |
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$this->flushProxy(); |
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} |
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// TODO: make this work |
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/* |
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function _create() { |
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$this->_createBackend($this->attributes); |
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$this->flushState(); |
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$this->flushProxy(); |
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} |
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*/ |
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joko |
1.2 |
function getResult() { |
329 |
joko |
1.1 |
if (!$this->meta[decoded]) { |
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$this->_decode(); |
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$this->_saveState(); |
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} |
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return $this->attributes; |
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} |
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function _setAttributes($data) { |
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$this->attributes = $data; |
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} |
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function flushProxy() { |
341 |
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connectdb(); |
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$sql = "DELETE FROM f_proxy WHERE oid='$this->objectId'"; |
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send_sql($sql); |
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} |
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function flushState() { |
347 |
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global $proxy; |
348 |
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unset($proxy[$this->objectId]); |
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$this->meta[decoded] = 0; |
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} |
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function _loadState() { |
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global $proxy; |
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// trace |
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//print Dumper($this); |
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// debug |
359 |
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logp(get_class($this) . "->_loadState()"); |
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if ($this->attributes = $proxy[$this->objectId]) { |
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//print "_loadState:" . dumpVar($this->attributes); |
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$this->meta[decoded] = 1; |
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// TODO: make a parameter from this (0 deactivates session-layer) |
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return 0; |
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} |
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} |
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function _saveState() { |
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global $proxy; |
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logp(get_class($this) . "->_saveState()"); |
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$proxy[$this->objectId] = $this->attributes; |
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//print "_saveState: " . dumpVar($this->attributes); |
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// TODO: throw exception-message back to user if operation fails |
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} |
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function _loadProxy() { |
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// FIXME! |
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if (!$this->meta[cache][db]) { return; } |
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// trace & debug |
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//print Dumper($this); |
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logp(get_class($this) . "->_loadProxy()"); |
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connectdb(); |
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$sql = "SELECT payload FROM f_proxy WHERE oid='$this->objectId'"; |
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if ($res = send_sql($sql)) { |
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$row = mysql_fetch_array($res, MYSQL_ASSOC); |
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if ($row) { |
391 |
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$this->payload = $row[payload]; |
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|
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// TODO: make a parameter from this (0 deactivates mysqldb-layer) |
393 |
|
|
return 0; |
394 |
|
|
} |
395 |
|
|
} |
396 |
|
|
} |
397 |
|
|
|
398 |
|
|
// TODO: use PEAR here |
399 |
|
|
function _saveProxy() { |
400 |
|
|
|
401 |
|
|
// FIXME! |
402 |
|
|
if (!$this->meta[cache][db]) { return; } |
403 |
|
|
|
404 |
|
|
logp(get_class($this) . "->_saveProxy()"); |
405 |
|
|
connectdb(); |
406 |
|
|
if ($this->payload) { |
407 |
|
|
//$sql = "INSERT INTO f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'"; |
408 |
|
|
$sql = "INSERT INTO f_proxy SET oid='$this->objectId', payload='$this->payload'"; |
409 |
|
|
if (!send_sql($sql)) { |
410 |
|
|
$sql = "UPDATE f_proxy SET payload='$this->payload' WHERE oid='$this->objectId'"; |
411 |
|
|
send_sql($sql); |
412 |
|
|
} |
413 |
|
|
} |
414 |
|
|
} |
415 |
|
|
|
416 |
|
|
function _loadRemote() { |
417 |
|
|
logp(get_class($this) . "->_loadRemote()"); |
418 |
|
|
|
419 |
|
|
// trace |
420 |
|
|
//print Dumper($this->meta); |
421 |
|
|
|
422 |
|
|
// TODO: test backend for reachability first (eventually cache this information and "reset" it by another party) |
423 |
|
|
|
424 |
|
|
// 1. check backend-handle |
425 |
|
|
if (!$this->backend) { |
426 |
|
|
logp(get_class($this) . "->_loadRemote: no backend handle, please check argument 'rpcinfo'", PEAR_LOG_CRIT); |
427 |
|
|
return; |
428 |
|
|
} |
429 |
|
|
|
430 |
|
|
// determine backend action by metadata |
431 |
|
|
// check for guid or oid |
432 |
|
|
if ($this->meta[guid]) { |
433 |
|
|
if (!$this->objectId) { |
434 |
|
|
logp(get_class($this) . "->_loadRemote: argument 'guid' requires valid objectId", PEAR_LOG_WARNING); |
435 |
|
|
return; |
436 |
|
|
} |
437 |
|
|
if (!$this->meta[classname]) { |
438 |
|
|
logp(get_class($this) . "->_loadRemote: argument 'guid' requires 'classname'", PEAR_LOG_WARNING); |
439 |
|
|
return; |
440 |
|
|
} |
441 |
|
|
$args = array( guid => $this->objectId, classname => $this->meta[classname] ); |
442 |
|
|
$result = $this->backend->send('getObjectByGuid', $args ); |
443 |
|
|
|
444 |
|
|
} elseif ($this->meta[oid]) { |
445 |
|
|
if (!$this->objectId) { |
446 |
|
|
logp(get_class($this) . "->_loadRemote: argument 'oid' requires valid objectId", PEAR_LOG_WARNING); |
447 |
|
|
return; |
448 |
|
|
} |
449 |
|
|
$result = $this->backend->send('getObject', $this->objectId); |
450 |
|
|
|
451 |
|
|
} elseif ($this->meta[key]) { |
452 |
|
|
if (!$this->meta[command]) { |
453 |
|
|
logp(get_class($this) . "->_loadRemote: argument 'key' requires 'command'", PEAR_LOG_WARNING); |
454 |
|
|
return; |
455 |
|
|
} |
456 |
|
|
/* |
457 |
|
|
if (!$this->meta[query]) { |
458 |
|
|
logp(get_class($this) . "->_loadRemote: argument 'key' requires 'query'", PEAR_LOG_WARNING); |
459 |
|
|
return; |
460 |
|
|
} |
461 |
|
|
*/ |
462 |
|
|
$result = $this->backend->send($this->meta[command], $this->meta[query]); |
463 |
|
|
|
464 |
|
|
} |
465 |
|
|
|
466 |
|
|
|
467 |
|
|
|
468 |
|
|
if ($result) { |
469 |
|
|
//print "result: " . dumpVar($result) . "<br>"; |
470 |
|
|
if (count($result) == 0) { return; } |
471 |
|
|
|
472 |
|
|
// FIXME: this is dangerous! |
473 |
|
|
if ($_GET[debug]) { |
474 |
|
|
print Dumper($result); |
475 |
|
|
} |
476 |
|
|
|
477 |
|
|
$this->payload = serialize($result); |
478 |
|
|
// ----- move this to _encode some times |
479 |
|
|
|
480 |
|
|
$this->_saveProxy(); |
481 |
|
|
//print "oid: $this->objectId<br>"; |
482 |
|
|
$this->flushState(); |
483 |
|
|
} else { |
484 |
|
|
//print "Error in _loadRemote!!!<br>"; |
485 |
|
|
logp(get_class($this) . "->_loadRemote: error while trying to talk to remote side", PEAR_LOG_CRIT); |
486 |
|
|
} |
487 |
|
|
|
488 |
|
|
} |
489 |
|
|
|
490 |
|
|
function _saveBackend($result) { |
491 |
|
|
logp(get_class($this) . "->_saveBackend()"); |
492 |
|
|
|
493 |
|
|
//$encoder = new TextEncode($result); |
494 |
|
|
//$encoder->toUTF8(); |
495 |
|
|
|
496 |
|
|
// check for guid or oid |
497 |
|
|
if($this->meta[guid]) { |
498 |
|
|
$args = array( 'guid' => $this->objectId, 'classname' => $this->meta[classname], 'data' => $result ); |
499 |
|
|
$response = $this->backend->send('saveObjectByGuid', $args, array( utf8 => 1) ); |
500 |
|
|
} |
501 |
|
|
if($this->meta[oid]) { |
502 |
|
|
$response = $this->backend->send('saveObject', array('oid' => $this->objectId, 'data' => $result), array( utf8 => 1) ); |
503 |
|
|
} |
504 |
|
|
} |
505 |
|
|
|
506 |
|
|
function _decode() { |
507 |
|
|
// fill attributes-hashtable from message-hashtable |
508 |
|
|
if (!$this->payload) { return; } |
509 |
|
|
//if ($this->attributes = $backend->decodeData($this->payload)) { |
510 |
|
|
if ($this->attributes = unserialize($this->payload)) { |
511 |
|
|
$this->meta[decoded] = 1; |
512 |
|
|
} |
513 |
|
|
} |
514 |
|
|
|
515 |
|
|
function store($struct) { |
516 |
|
|
$this->payload = serialize($struct); |
517 |
|
|
$this->_saveProxy(); |
518 |
|
|
} |
519 |
|
|
|
520 |
|
|
} |
521 |
|
|
|
522 |
|
|
?> |