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CC-3337: Optimize Schedule/get-current-playlist/format/json 

- I've updated the logic to query the cc_schedule table directly for the previous, next, current shows which makes look up time much faster. If that doesn't work then I revert back to the previous logic, incase nothing is scheduled within an hour of the current time.
This commit is contained in:
Daniel 2012-02-22 11:36:48 -05:00
parent 664584ec6b
commit 80e33ee533
1 changed files with 65 additions and 6 deletions
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71
airtime_mvc/application/models/Schedule.php
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@ -146,18 +146,77 @@ class Application_Model_Schedule {
$date = new Application_Model_DateHelper;
$timeNow = $date->getTimestamp();
$utcTimeNow = $date->getUtcTimestamp();
$currentShow = Application_Model_Show::GetCurrentShow($utcTimeNow);
$results = Application_Model_Schedule::GetPrevCurrentNext($utcTimeNow);
$range = array("env"=>APPLICATION_ENV,
"schedulerTime"=>$timeNow,
"previous"=>Application_Model_Dashboard::GetPreviousItem($utcTimeNow),
"current"=>Application_Model_Dashboard::GetCurrentItem($utcTimeNow),
"next"=>Application_Model_Dashboard::GetNextItem($utcTimeNow),
"currentShow"=>Application_Model_Show::GetCurrentShow($utcTimeNow),
"nextShow"=>Application_Model_Show::GetNextShows($utcTimeNow, 1),
"previous"=>$results['previous'],
"current"=>$results['current'],
"next"=>$results['next'],
"currentShow"=>$currentShow,
"nextShow"=>"",//Application_Model_Show::GetNextShows($utcTimeNow, 1),
"timezone"=> date("T"),
"timezoneOffset"=> date("Z"));
return $range;
}
/**
* Queries the database for the set of schedules one hour before and after the given time.
* If a show starts and ends within that time that is considered the current show. Then the
* scheduled item before it is the previous show, and the scheduled item after it is the next
* show. This way the dashboard getCurrentPlaylist is very fast. But if any one of the three
* show types are not found through this mechanism a call is made to the old way of querying
* the database to find the track info.
**/
public static function GetPrevCurrentNext($p_timeNow)
{
global $CC_CONFIG, $CC_DBC;
$sql = "Select ft.artist_name, ft.track_title, st.starts as starts, st.ends as ends, st.media_item_played as media_item_played
FROM cc_schedule st LEFT JOIN cc_files ft ON st.file_id = ft.id LEFT JOIN cc_show_instances sit ON st.instance_id = sit.id
WHERE st.starts > (TIMESTAMP '$p_timeNow'-INTERVAL '1 hours') AND st.starts < (TIMESTAMP '$p_timeNow'+INTERVAL '1 hours') AND st.starts < sit.ends
ORDER BY st.starts";
$row = $CC_DBC->GetAll($sql);
$numberOfRows = count($row);
$results;
$timeNowAsMillis = strtotime($p_timeNow);
for( $i = 0; $i < $numberOfRows && !isset($results); ++$i ){
if ((strtotime($row[$i]['starts']) <= $timeNowAsMillis) && (strtotime($row[$i]['ends']) >= $timeNowAsMillis)){
if ( $i - 1 >= 0){
$results['previous'] = array("name"=>$row[$i-1]["artist_name"]." - ".$row[$i-1]["track_title"],
"starts"=>$row[$i-1]["starts"],
"ends"=>$row[$i-1]["ends"]);
}
$results['current'] = array("name"=>$row[$i]["artist_name"]." - ".$row[$i]["track_title"],
"starts"=>$row[$i]["starts"],
"ends"=>$row[$i]["ends"],
"media_item_played"=>$row[0]["media_item_played"],
"record"=>0);
if ( $i +1 <= $numberOfRows){
$results['next'] = array("name"=>$row[$i+1]["artist_name"]." - ".$row[$i+1]["track_title"],
"starts"=>$row[$i+1]["starts"],
"ends"=>$row[$i+1]["ends"]);
}
break;
}
}
if (!isset($results['previous'])){
$results['previous'] = Application_Model_Dashboard::GetPreviousItem($p_timeNow);
}
if (!isset($results['current'])){
$results['current'] = Application_Model_Dashboard::GetCurrentItem($p_timeNow);
}
if (!isset($results['next'])) {
$results['next'] = Application_Model_Dashboard::GetNextItem($p_timeNow);
}
return $results;
}
public static function GetLastScheduleItem($p_timeNow){
global $CC_CONFIG, $CC_DBC;