長輪詢鎖定其他AJAX呼叫

我正在尋找做長輪詢來「推」一些數據下來到客戶端，我也做了與長輪詢並行服務器的其他無關的AJAX調用。看起來，我的其他AJAX調用不會完成，直到長時間輪詢收到響應（無論是響應還是超時）。當我瀏覽Javascript時，看起來第二個AJAX請求在適當的時候被髮送，但是在長的輪詢請求得到響應之前沒有收到響應。任何想法是怎麼回事？長輪詢鎖定其他AJAX呼叫

這裏是長輪詢部的代碼：

服務器端：

function getPlaylistTracksIfChanged($playlist_id, $numClientTracks) { 
    $reportChange = false; 
    for($i = 0; $i < 10; $i++) { 
    $numServerTracks = $this->PlaylistTrack->find('count', array(
    'conditions' => array('playlist_id' => $playlist_id) 
    ) 
    ); 

    if($numClientTracks != $numServerTracks) { 
    $reportChange = true; 
    break; 

    } 

    sleep(3); 

    } 

    if($reportChange) { 
    $playlist_tracks = $this->PlaylistTrack->find('all', array(
    'conditions' => array('playlist_id' => $playlist_id), 
    'order' => array('PlaylistTrack.position') 
    ) 
    ); 

    $this->set('playlist_tracks', $playlist_tracks); 
    $this->layout = false; 
    $this->render('show_playlist_tracks_list'); 

    } else { 
    $this->autoRender = false; 
    return 'false'; 
    } 

}

客戶端：

function checkForChangesOnServer() { 
$.post('/getResultsIfChanged/' + playlist_id + '/' + $('#sortable_tracks').children().size(), function(results) { 

    if(results == 'false') { 
    //alert('no change'); 
    } else { 
    //alert('change'); 
    } 

    checkForPlaylistChangesOnServer(); 

}); 
}

而另一AJAX調用的示例：

服務器端：

function getLibraryTracksStartingWithLetter($user_id, $letter) { 
    $results = $this->Track->find(
    'all', 
    array(
    'conditions' => array(
    'user_id' => $user_id, 
    'OR' => array(
     'Track.artist LIKE' => $letter . '%', 
     'Track.name LIKE' => $letter . '%' 
    ) 
    ), 
    'order' => array('case when Track.artist = "" then 1 else 0 end', 'Track.artist', 'Track.name') 
    ) 
); 

    $this->set('results', $results); 
    $this->layout = false; 
    $this->render('show_library_results_list'); 
}

客戶端：

function loadLibraryResultsForLetter(letter) { 
highlightLetterFilter(letter); 

$.post('/getLibraryTracksStartingWithLetter/' + user_id + '/' + letter, function(results) { 
    updateLibraryResults(results); 
}); 
}

來源

2010-12-16 liamacheung