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<?php
/**
* Web service utility class.
*
* @file
* @author Niklas Laxström
* @license GPL-2.0+
*/
/**
* Runs multiple web service queries asynchronously to save time.
*
* @ingroup TranslationWebService
* @since 2015.02
*/
class QueryAggregator {
protected $queries = array();
protected $responses = array();
protected $timeout = 0;
protected $hasRun = false;
/**
* Register a query to be run.
* @param TranslationQuery $query
* @return mixed Query id that can be used to fetch results.
*/
public function addQuery( TranslationQuery $query ) {
$this->queries[] = $query;
$this->timeout = max( $query->getTimeout(), $this->timeout );
return count( $this->queries ) - 1;
}
/**
* Returns a response for a query.
* @param mixed $id Query id.
* @return TranslationQueryResponse
* @throws RuntimeException if called before run() has been called.
*/
public function getResponse( $id ) {
if ( !$this->hasRun ) {
throw new RuntimeException( 'Tried to get response before queries ran' );
}
return TranslationQueryResponse::newFromMultiHttp( $this->responses[$id] );
}
/**
* Runs all the queries.
*/
public function run() {
$http = new MultiHttpClient( array(
'reqTimeout' => $this->timeout,
'connTimeout' => 3
) );
$responses = $http->runMulti( $this->getMultiHttpQueries( $this->queries ) );
foreach ( $responses as $index => $response ) {
$this->responses[$index] = $response;
}
$this->hasRun = true;
}
/**
* Formats queries for format used by MultiHttpClient class.
* @param TranslationQuery[] $queries
* @return array[]
*/
protected function getMultiHttpQueries( $queries ) {
$converter = function( TranslationQuery $q ) {
return array(
'url' => $q->getUrl(),
'method' => $q->getMethod(),
'query' => $q->getQueryParameters(),
'body' => $q->getBody(),
);
};
return array_map( $converter, $queries );
}
}
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