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<?php |
<?php |
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/** |
/** |
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* This file contains the ProxyDataSource child class |
* This file contains the ProxyDataSource child class |
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* that uses the Data::Driver::Proxy object to talk to a remote rpc server. |
* that uses the Data::Driver::Proxy object to talk |
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* |
* to a remote rpc server. |
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* Data::Driver::Proxy uses a PEAR XML::RPC object to actually |
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* talk HTTP and serialize data chunks to and from XML, |
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* but adds some caching to this "process of fetching data from a remote side". |
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* It "proxies" arbitrary data chunks a) inside a native php4 session, |
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* b) by talking to a rdbms (single proxy-table) or c) [TODO] using PEAR::Cache. |
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* |
* |
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* @author Andreas Motl <andreas.motl@ilo.de> |
* @author Andreas Motl <andreas.motl@ilo.de> |
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* @author Sebastian Utz <seut@tunemedia.de> |
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* @package phpHtmlLib |
* @package phpHtmlLib |
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* @module ProxyDataSource |
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* |
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*/ |
*/ |
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/** |
/** |
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* $Id$ |
* $Id$ |
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* |
* |
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* $Log$ |
* $Log$ |
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* Revision 1.3 2003/03/01 15:36:11 joko |
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* + debugging |
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* + renamed some methods regarding new proposal (build_proxy_options, fetch_result, etc.) |
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* |
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* Revision 1.2 2003/03/01 04:50:27 joko |
* Revision 1.2 2003/03/01 04:50:27 joko |
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* encapsulated all output into tracing mode |
* encapsulated all output into tracing mode |
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* disabled tracing |
* disabled tracing |
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* This requires the MemoryDataSource base class |
* This requires the MemoryDataSource base class |
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* |
* |
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*/ |
*/ |
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include_once($phphtmllib."/widgets/data_source/MemoryDataSource.inc"); |
// V1: compile-time-include, stable since years ;-) |
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include_once($phphtmllib."/widgets/data_source/MemoryDataSource.inc"); |
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// V2: runtime-load proposal, more flexible |
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// loadModule('MemoryDataSource', 'inc'); // doesn't work (would do if basepath of module is in libpath) |
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// loadModule($phphtmllib . '::widgets::data_source::MemoryDataSource', 'inc'); // works (by accident) |
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// loadModule($phphtmllib . "/widgets/data_source/MemoryDataSource", "inc"); // works (should be stable) |
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// loadModule($phphtmllib . "/widgets/data_source/MemoryDataSource.inc", null); // works (should be stable) |
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/** |
/** |
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* Have to have PEAR and DB included |
* Have to have PEAR and DB included |
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* the pear dir must be in the |
* the pear dir must be in the |
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* include path. |
* include path. |
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*/ |
*/ |
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//require_once("PEAR.php"); // FIXME: what about PEAR::XML::RPC? |
// require_once("PEAR.php"); // FIXME: what about PEAR::XML::RPC? |
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//require_once("DB.php"); |
// require_once("DB.php"); |
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/** |
/** |
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* This ProxyDataSource child class is *completely* independent |
* This ProxyDataSource child class is *completely* independent |
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* |
* |
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* But the point is: Caching! The actual *data* isn't read redundant! |
* But the point is: Caching! The actual *data* isn't read redundant! |
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* |
* |
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* |
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* !!!!!! refactor this to Data::Driver::Proxy !!!!!! <----------------- |
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* |
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* Data::Driver::Proxy instantiates "handlers" below itself |
* Data::Driver::Proxy instantiates "handlers" below itself |
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* which act as encapsulated workers to actually do the stuff to do. |
* which act as encapsulated workers to actually do the stuff to do. |
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* It can cache data for "disconnected mode" using the |
* It can cache data for "disconnected mode" using the |
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* One worker already implemented is Data::Driver::RPC::Remote, which |
* One worker already implemented is Data::Driver::RPC::Remote, which |
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* 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. |
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* |
* |
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* --- refactored here, but: redundant somehow --- |
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* Data::Driver::Proxy uses a PEAR XML::RPC object to actually |
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* talk HTTP and serialize data chunks to and from XML, |
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* but adds some caching to this "process of fetching data from a remote side". |
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* It "proxies" arbitrary data chunks a) inside a native php4 session, |
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* b) by talking to a rdbms (single proxy-table) or c) [TODO] using PEAR::Cache. |
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* --- refactored here, but: redundant somehow --- |
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* |
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* !!!!!! refactor this to Data::Driver::Proxy !!!!!! <----------------- |
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* |
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* |
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* How to use? |
* How to use? |
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* |
* |
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* Pass an array holding "locator metadata" to the constructor. |
* Pass an array holding "locator metadata" to the constructor. |
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* |
* |
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* @author Andreas Motl <andreas.motl@ilo.de> |
* @author Andreas Motl <andreas.motl@ilo.de> |
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* @author Sebastian Utz <seut@tunemedia.de> |
* @author Sebastian Utz <seut@tunemedia.de> |
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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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* |
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* @author-url http://www.netfrag.org/~joko/ |
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* @author-url http://www.netfrag.org/~jonen/ |
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* @license-url http://www.gnu.org/licenses/lgpl.txt |
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* |
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* @package phpHtmlLib |
* @package phpHtmlLib |
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* @module ProxyDataSource |
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* |
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*/ |
*/ |
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/** |
/** |
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* This var holds the locator metadata hash |
* This var holds the locator metadata hash |
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* that is used to feed metadata to a per-query-instance |
* that is used to feed metadata to a per-query-instance |
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* of a Data::Driver::Proxy object. |
* of a Data::Driver::Proxy object. |
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* |
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*/ |
*/ |
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var $_locator = NULL; |
var $_locator = NULL; |
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/** |
/** |
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* This var holds the query hash |
* This var holds the query hash |
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* that is used to feed as query to a per-query-instance |
* that is used to feed as query to a per-query-instance |
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* of a Data::Driver::Proxy object. |
* of a Data::Driver::Proxy object. |
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* |
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*/ |
*/ |
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var $_query = NULL; |
var $_query = NULL; |
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* queryData() - execute a query against a data storage |
* queryData() - execute a query against a data storage |
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* querySchema() - execute a query against underlying storage metadata |
* querySchema() - execute a query against underlying storage metadata |
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* sendCommand() - send a command against an arbitrary execution engine |
* sendCommand() - send a command against an arbitrary execution engine |
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* |
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*/ |
*/ |
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var $_proxy = NULL; |
var $_proxy = NULL; |
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/** |
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* This var holds options fed to the Proxy object |
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* These are built from locator metadata (_locator) and query arguments (_query) |
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* It's a simple structured hash: |
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* $proxy_options = array( |
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* method => '<remote-method-name>', |
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* args => array('list', 'of', 'arguments') |
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* ); |
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* |
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*/ |
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var $_proxy_options = NULL; |
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/** |
/** |
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* this holds the query result from the |
* this holds the query result from the |
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* Data::Driver::Proxy->queryXyz() call |
* Data::Driver::Proxy->queryXyz() call |
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*/ |
*/ |
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var $_result = NULL; |
var $_result = NULL; |
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/** |
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* This holds some information about the tracing level. |
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* |
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*/ |
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var $_debug = array( |
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notice => 0, |
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trace => 0, |
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payload => 0, |
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); |
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/** |
/** |
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* The constructor is used to pass in the |
* The constructor is used to pass in the |
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*/ |
*/ |
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function ProxyDataSource( &$locator, $query ) { |
function ProxyDataSource( &$locator, $query ) { |
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$this->trace = 0; |
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$this->set_locator( $locator ); |
$this->set_locator( $locator ); |
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$this->set_query( $query ); |
$this->set_query( $query ); |
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} |
} |
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* @param string - $proxy_name (namespaced classname - perl syntax - e.g.: Data::Driver::Proxy) |
* @param string - $proxy_name (namespaced classname - perl syntax - e.g.: Data::Driver::Proxy) |
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* |
* |
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*/ |
*/ |
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function call_proxy_method() { |
function do_proxy_call() { |
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// 1. read args |
// 1. read args |
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} |
} |
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} |
} |
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function call_proxy() { |
function build_proxy_options() { |
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// make up a command from metadata |
// make up a command from metadata |
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// FIXME: abstract this some more (e.g. via a CommandMapper|Registry) |
// FIXME: abstract this some more (e.g. via a CommandMapper|Registry) |
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switch ($this->_query[metatype]) { |
switch ($this->_query[metatype]) { |
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} |
} |
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// trace |
// trace |
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if ($this->trace) { |
$this->debug(null, '<b>= = = = = = = = = = = = = = = = = = = = = =</b>'); |
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print "ProxyDataSource->do_query()<br/>"; |
$this->trace('build_proxy_options', array( |
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print "_locator = " . Dumper($this->_locator); |
"_locator" => $this->_locator, |
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print "_query = " . Dumper($this->_query); |
"_query" => $this->_query, |
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print "<b>\$command = " . $command . "</b><br/>"; |
"command" => '<b>' . $command . "</b>", |
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print "<b>\$args = " . Dumper($args) . "</b><br/>"; |
"args" => $args |
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} |
)); |
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$this->_proxy_options = array( |
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method => $command, |
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args => $args, |
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); |
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} |
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function fetch_result() { |
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$this->build_proxy_options(); |
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$method = $this->_proxy_options[method]; |
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$args = $this->_proxy_options[args]; |
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// pre-flight checks |
// pre-flight checks |
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if (!$command) { |
if (!$method) { |
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$msg = "Remote command could not be resolved, please pass in or check configuration."; |
$msg = "Remote command could not be resolved, please pass in or check configuration."; |
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user_error("ProxyDataSource::do_query() - failed: " . $msg); |
user_error("ProxyDataSource::do_query() - failed: " . $msg); |
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return; |
return; |
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} |
} |
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// do remote call here and get result |
// do remote call here and get result |
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// FIXME: handle synchronous/asynchronous mode here!!! |
// FIXME: handle synchronous/asynchronous mode here!!! |
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$this->call_proxy_method($command, $args); |
$this->do_proxy_call($method, $args); |
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// TODO: ... = $this->poll_proxy_result and $this->get_proxy_result |
// TODO: ... = $this->poll_proxy_result and $this->get_proxy_result |
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$this->_result = $this->_proxy->getAttributes(); |
$this->_result = $this->_proxy->getAttributes(); |
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// trace |
// trace |
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if ($this->trace) { |
if ($this->_debug[notice]) { |
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//print "_result = " . Dumper($this->_result); |
//print "_result = " . Dumper($this->_result); |
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print "_result - count = " . sizeof($this->_result) . "<br/>"; |
print "_result - count = " . sizeof($this->_result) . "<br/>"; |
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} |
} |
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// pass data to MemoryDataSource |
} |
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// V1 - doesn't work! |
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//$this->_data_list = $this->_result; |
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// V2 - ??? |
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//$this->MemoryDataSource(); |
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// V3 - copy & paste |
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/* |
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foreach ($this->_result as $value) { |
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print Dumper($value); |
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if ($this->add_data_row($value)) { |
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$count++; |
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} |
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} |
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$this->set_total_rows( $count ); |
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$this->sort(); |
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*/ |
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} |
function do_query() { |
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//print "query!<br/>"; |
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$this->fetch_result(); |
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$this->handle_result(); |
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} |
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function get_header() { |
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$this->fetch_result(); |
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$this->read_labels_from_result(); |
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return $this->get_labels(); |
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} |
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function O_do_prequery() { |
function O_do_prequery() { |
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//print "prequery!<br/>"; |
//print "prequery!<br/>"; |
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// HACK!!! |
// HACK!!! |
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// modify behaviour here: for now it is needed to call for the schem |
// modify behaviour here: for now it is needed to call for the schem |
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// eventually modify here to get schema from some registry component (already locally available) |
// eventually modify here to get schema from some registry component (already locally available) |
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$this->call_proxy(); |
$this->fetch_result(); |
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//print Dumper($this->_result); |
//print Dumper($this->_result); |
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//print Dumper($this->_result[0]); |
//print Dumper($this->_result[0]); |
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//exit; |
//exit; |
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//$this->_get_header(); |
//$this->_get_header(); |
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} |
} |
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function do_query() { |
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//print "query!<br/>"; |
function O_get_header() { |
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$this->handle_result(); |
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} |
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function _get_header() { |
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//$this->do_prequery(); |
//$this->do_prequery(); |
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// FIXME: prevent multi-calls by base class |
// FIXME: prevent multi-calls by base class |
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$this->call_proxy(); |
$this->fetch_result(); |
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foreach($this->_result[0] as $key => $value) { |
foreach($this->_result[0] as $key => $value) { |
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array_push($this->_data_keys, $key); |
array_push($this->_data_keys, $key); |
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} |
} |
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} |
} |
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/** |
/** |
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* This function gets the next data row |
* This function gets the next data row |
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* from the query() |
* from the query() |