/**
*
* @return object|array Response array or WP Error object.
*/
protected function _getHTTPResponseWithCache($sURL, $aArguments = array(), $iCacheDuration = 86400)
{
$_oCacheTable = new AmazonAutoLinks_DatabaseTable_request_cache(AmazonAutoLinks_Registry::$aDatabaseTables['request_cache']);
// If a cache exists, use it.
$_aData = 0 === $iCacheDuration ? array() : $_oCacheTable->getCache($this->sCacheName);
$_aData = $_aData + array('remained_time' => 0, 'charset' => null, 'data' => null);
if ($_aData['remained_time'] && $_aData['data']) {
$this->sLastCharSet = $_aData['charset'];
return $_aData['data'];
}
// @todo maybe implement a mechanism that fetches data in the background
// and return the stored data anyway.
// Otherwise, retrieve a data from a remote server and set a cache.
$_asResponse = file_get_contents($sURL);
$this->sLastCharSet = $this->getCharacterSetFromResponseHeader($http_response_header);
$_oCacheTable->setCache($_sCacheName, $_asResponse, (int) $iCacheDuration, array('request_uri' => $sURL, 'type' => 'file_get_contents', 'charset' => $this->sLastCharSet));
return $_asResponse;
}
/**
* A wrapper method for the set_transient() function.
*
* @since unknown
* @since 3 Changed the name from `setTransient()`.
*/
public function setCache($sTransientKey, $vData, $iDuration = 0, $sRequestURI = '')
{
$sLockTransient = AmazonAutoLinks_Registry::TRANSIENT_PREFIX . '_' . md5("Lock_{$sTransientKey}");
// Check if the transient is locked
if (AmazonAutoLinks_WPUtility::getTransient($sLockTransient) !== false) {
return;
// it means the cache is being modified right now in a different process.
}
// Set a lock flag transient that indicates the transient is being renewed.
AmazonAutoLinks_WPUtility::setTransient($sLockTransient, time(), AmazonAutoLinks_WPUtility::getAllowedMaxExecutionTime(30, 30));
// Save the cache
if ($this->bUseCacheTable) {
$_oCacheTable = new AmazonAutoLinks_DatabaseTable_request_cache(AmazonAutoLinks_Registry::$aDatabaseTables['request_cache']);
$_aData = $_oCacheTable->setCache($sTransientKey, array('mod' => time(), 'data' => $vData), (int) $iDuration, array('request_uri' => $sRequestURI, 'type' => 'api'));
} else {
AmazonAutoLinks_WPUtility::setTransient($sTransientKey, array('mod' => time(), 'data' => $this->oEncrypt->encode($vData)), 9999999);
}
}
/**
* Sets a cache by url.
* It internally sets a cache name.
* @return boolean
* @todo Examine the return value as it is not tested.
*/
private function _setCache($sURL, $mData, $iCacheDuration = 86400)
{
$_sCharSet = $this->_getCharacterSet($mData);
$_oCacheTable = new AmazonAutoLinks_DatabaseTable_request_cache(AmazonAutoLinks_Registry::$aDatabaseTables['request_cache']);
$_bResult = $_oCacheTable->setCache($this->_getCacheName($sURL), $mData, $iCacheDuration ? (int) $iCacheDuration : 86400, array('request_uri' => $sURL, 'type' => $this->sRequestType, 'charset' => $_sCharSet));
$this->sLastCharSet = $_sCharSet;
return $_bResult;
}
