// pad with JSONP -- TMH 2012/07/20
$useJSONP = true;
// keep history -- TMH 2012/08/31
$keepHistory = false;
// grid Updated time
$updatedTime = -1;
$phpStart = microtime(true);
$queryManager = new QueryManager($readOnly);
$contourDataStore = new ContourCacheHelper($useGzip, $bandHelper->getSchemeId());
$phpTime = microtime(true) - $phpStart;
// Check if $txnAt for $timestamp is older than specified right now,
// then only proceed. Otherwise just exit from here
// Honour force flag if is set
$lastTxnAt = $txnAt;
if ($txnAt >= 0) {
$lastTxnAt = $queryManager->getGridUpdatedTime($timestamp);
}
if ($txnAt >= 0 && $lastTxnAt >= $txnAt) {
echo "Grid last updated with txn stamp [{$lastTxnAt}]," . " more recent than / equal to [{$txnAt}]\n";
echo "Use force write if it was intended to forcefully update data";
exit(0);
}
$midTime = microtime(true);
$queryStart = microtime(true);
$allData = $queryManager->getDataForWindBasedInterpolation($timestamp, 6);
if (empty($allData['ozoneValues'])) {
echo "No data available for interpolation algorithm for {$timestamp}\n";
exit(0);
}
$queryTime = microtime(true) - $queryStart;
$writeToGridStatus = true;
$grid = array();
$queryTime = 0;
//$driver = new Java('LatLongInterpolation.LatLngDriver', $bandHashMap);
for ($t = $timestamp; $t <= $timestamp2; $t += $interval) {
$queryStart = microtime(true);
if ($use_flat) {
$loadedData = $queryManager->getPointData_from_json($t, $pointsOfInterest);
if (!empty($loadedData)) {
if ($loadedData[0]['gen_time'] > $latest_gen_time) {
$latest_gen_time = $loadedData[0]['gen_time'];
}
}
} else {
$loadedData = $queryManager->getPointData($t, $pointsOfInterest, $gridReference, $useLatestDataWhenFail);
if (!empty($loadedData)) {
$latest_gen_time = $queryManager->getGridUpdatedTime($t);
}
}
$queryTime += microtime(true) - $queryStart;
// now prepare data
if (!empty($loadedData)) {
$latlngData = array();
// count($pointsOfInterest) should be same as count($loadedData)
for ($i = 0; $i < count($pointsOfInterest); $i++) {
$labelId = $bandHelper->getLabelId($loadedData[$i]['o3']);
$gridPoint = $loadedData[$i]['lat'] . ':' . $loadedData[$i]['lng'];
$attr = array('ozone_level' => intval($loadedData[$i]['o3']), 'exp' => $loadedData[$i]['exp'], 'gridpoint' => "{$gridPoint}");
if ($add_gen_time) {
$attr['gen_time'] = $loadedData[$i]['gen_time'];
}
$latlngData[] = array('label_id' => $labelId, 'lat' => $pointsOfInterest[$i][0], 'lng' => $pointsOfInterest[$i][1], 'attr' => $attr);
continue;
}
$lat = $stationData[$i][1];
$lng = $stationData[$i][2];
$o3 = floor($stationData[$i][3] + 0.5);
$siteDesc = $stationData[$i][5];
$responseObject['station'][] = array('lat' => $lat, 'lng' => $lng, 'o3' => $o3, 'desc' => $siteDesc);
}
}
$end = microtime(true);
if (!$fsCacheDetected) {
// TODO: Do we want to store the result?
}
if ($requestType == 'json') {
header('Content-Type: text/javascript');
$mod_timestamp = $queryManager->getGridUpdatedTime($timestamp);
header('Last-Modified: ' . gmdate("D, d M Y H:i:s", $mod_timestamp) . ' GMT');
$now = time();
// cache up to 5 min (at 3, 8, 13, ... min) if grid was timestamp is within 6 hours
if ($now - $timestamp < 3600 * 6) {
$expire_timestamp = floor(($now - 180 + 300) / 300) * 300 + 180;
$max_age = 300;
} else {
// cache up to 1 hour otherwise
$expire_timestamp = floor(($now - 180 + 3600) / 300) * 300 + 180;
$max_age = 3600;
}
// else
header('Cache-Control: max-age=' . $max_age);
header('Expires: ' . gmdate("D, d M Y H:i:s", $expire_timestamp) . ' GMT');
//echo "timestamp = '$timestamp' (".date($timestamp).")". " ; mod_timestamp = '$mod_timestamp' ; now = '$now' ; expire_timestamp = '$expire_timestamp'\n";